README.wasm: add instructions for enabling mulhi

Change-Id: I1e9dd737f06ad76f73824352291a6e129ca5ded1

.gitignore

@@ -22,6 +22,7 @@ Makefile.in
 examples/anim_diff
 examples/[cdv]webp
 examples/gif2webp
+examples/img2webp
 examples/webpmux
 src/webp/config.h*
 src/webp/stamp-h1
@@ -34,3 +35,7 @@ src/webp/stamp-h1
 CMakeCache.txt
 CMakeFiles/
 cmake_install.cmake
+.gradle
+/build
+extras/get_disto
+extras/webp_quality

AUTHORS

@@ -5,6 +5,7 @@ Contributors:
 - Hui Su (huisu at google dot com)
 - James Zern (jzern at google dot com)
 - Jan Engelhardt (jengelh at medozas dot de)
+- Jehan (jehan at girinstud dot io)
 - Johann (johann dot koenig at duck dot com)
 - Jovan Zelincevic (jovan dot zelincevic at imgtec dot com)
 - Jyrki Alakuijala (jyrki at google dot com)
@@ -17,6 +18,7 @@ Contributors:
 - Mislav Bradac (mislavm at google dot com)
 - Nico Weber (thakis at chromium dot org)
 - Noel Chromium (noel at chromium dot org)
+- Owen Rodley (orodley at google dot com)
 - Parag Salasakar (img dot mips1 at gmail dot com)
 - Pascal Massimino (pascal dot massimino at gmail dot com)
 - Paweł Hajdan, Jr (phajdan dot jr at chromium dot org)

Android.mk

@@ -11,27 +11,39 @@ ifeq ($(APP_OPTIM),release)
   endif
 endif
 
+# mips32 fails to build with clang from r14b
+# https://bugs.chromium.org/p/webp/issues/detail?id=343
+ifeq ($(findstring clang,$(NDK_TOOLCHAIN_VERSION)),clang)
+  ifeq ($(TARGET_ARCH),mips)
+    clang_version := $(shell $(TARGET_CC) --version)
+    ifneq ($(findstring clang version 3,$(clang_version)),)
+      WEBP_CFLAGS += -no-integrated-as
+    endif
+  endif
+endif
+
 ifneq ($(findstring armeabi-v7a, $(TARGET_ARCH_ABI)),)
   # Setting LOCAL_ARM_NEON will enable -mfpu=neon which may cause illegal
   # instructions to be generated for armv7a code. Instead target the neon code
   # specifically.
   NEON := c.neon
   USE_CPUFEATURES := yes
+  WEBP_CFLAGS += -DHAVE_CPU_FEATURES_H
 else
   NEON := c
 endif
 
 dec_srcs := \
-    src/dec/alpha.c \
-    src/dec/buffer.c \
-    src/dec/frame.c \
-    src/dec/idec.c \
-    src/dec/io.c \
-    src/dec/quant.c \
-    src/dec/tree.c \
-    src/dec/vp8.c \
-    src/dec/vp8l.c \
-    src/dec/webp.c \
+    src/dec/alpha_dec.c \
+    src/dec/buffer_dec.c \
+    src/dec/frame_dec.c \
+    src/dec/idec_dec.c \
+    src/dec/io_dec.c \
+    src/dec/quant_dec.c \
+    src/dec/tree_dec.c \
+    src/dec/vp8_dec.c \
+    src/dec/vp8l_dec.c \
+    src/dec/webp_dec.c \
 
 demux_srcs := \
     src/demux/anim_decode.c \
@@ -40,6 +52,7 @@ demux_srcs := \
 dsp_dec_srcs := \
     src/dsp/alpha_processing.c \
     src/dsp/alpha_processing_mips_dsp_r2.c \
+    src/dsp/alpha_processing_neon.$(NEON) \
     src/dsp/alpha_processing_sse2.c \
     src/dsp/alpha_processing_sse41.c \
     src/dsp/argb.c \
@@ -56,23 +69,29 @@ dsp_dec_srcs := \
     src/dsp/dec_sse41.c \
     src/dsp/filters.c \
     src/dsp/filters_mips_dsp_r2.c \
+    src/dsp/filters_msa.c \
+    src/dsp/filters_neon.$(NEON) \
     src/dsp/filters_sse2.c \
     src/dsp/lossless.c \
     src/dsp/lossless_mips_dsp_r2.c \
+    src/dsp/lossless_msa.c \
     src/dsp/lossless_neon.$(NEON) \
     src/dsp/lossless_sse2.c \
     src/dsp/rescaler.c \
     src/dsp/rescaler_mips32.c \
     src/dsp/rescaler_mips_dsp_r2.c \
+    src/dsp/rescaler_msa.c \
     src/dsp/rescaler_neon.$(NEON) \
     src/dsp/rescaler_sse2.c \
     src/dsp/upsampling.c \
     src/dsp/upsampling_mips_dsp_r2.c \
+    src/dsp/upsampling_msa.c \
     src/dsp/upsampling_neon.$(NEON) \
     src/dsp/upsampling_sse2.c \
     src/dsp/yuv.c \
     src/dsp/yuv_mips32.c \
     src/dsp/yuv_mips_dsp_r2.c \
+    src/dsp/yuv_neon.$(NEON) \
     src/dsp/yuv_sse2.c \
 
 dsp_enc_srcs := \
@@ -84,39 +103,45 @@ dsp_enc_srcs := \
     src/dsp/enc_avx2.c \
     src/dsp/enc_mips32.c \
     src/dsp/enc_mips_dsp_r2.c \
+    src/dsp/enc_msa.c \
     src/dsp/enc_neon.$(NEON) \
     src/dsp/enc_sse2.c \
     src/dsp/enc_sse41.c \
     src/dsp/lossless_enc.c \
     src/dsp/lossless_enc_mips32.c \
     src/dsp/lossless_enc_mips_dsp_r2.c \
+    src/dsp/lossless_enc_msa.c \
     src/dsp/lossless_enc_neon.$(NEON) \
     src/dsp/lossless_enc_sse2.c \
     src/dsp/lossless_enc_sse41.c \
+    src/dsp/ssim.c \
+    src/dsp/ssim_sse2.c \
 
 enc_srcs := \
-    src/enc/alpha.c \
-    src/enc/analysis.c \
-    src/enc/backward_references.c \
-    src/enc/config.c \
-    src/enc/cost.c \
-    src/enc/delta_palettization.c \
-    src/enc/filter.c \
-    src/enc/frame.c \
-    src/enc/histogram.c \
-    src/enc/iterator.c \
-    src/enc/near_lossless.c \
-    src/enc/picture.c \
-    src/enc/picture_csp.c \
-    src/enc/picture_psnr.c \
-    src/enc/picture_rescale.c \
-    src/enc/picture_tools.c \
-    src/enc/quant.c \
-    src/enc/syntax.c \
-    src/enc/token.c \
-    src/enc/tree.c \
-    src/enc/vp8l.c \
-    src/enc/webpenc.c \
+    src/enc/alpha_enc.c \
+    src/enc/analysis_enc.c \
+    src/enc/backward_references_cost_enc.c \
+    src/enc/backward_references_enc.c \
+    src/enc/config_enc.c \
+    src/enc/cost_enc.c \
+    src/enc/delta_palettization_enc.c \
+    src/enc/filter_enc.c \
+    src/enc/frame_enc.c \
+    src/enc/histogram_enc.c \
+    src/enc/iterator_enc.c \
+    src/enc/near_lossless_enc.c \
+    src/enc/picture_enc.c \
+    src/enc/picture_csp_enc.c \
+    src/enc/picture_psnr_enc.c \
+    src/enc/picture_rescale_enc.c \
+    src/enc/picture_tools_enc.c \
+    src/enc/predictor_enc.c \
+    src/enc/quant_enc.c \
+    src/enc/syntax_enc.c \
+    src/enc/token_enc.c \
+    src/enc/tree_enc.c \
+    src/enc/vp8l_enc.c \
+    src/enc/webp_enc.c \
 
 mux_srcs := \
     src/mux/anim_encode.c \
@@ -125,20 +150,20 @@ mux_srcs := \
     src/mux/muxread.c \
 
 utils_dec_srcs := \
-    src/utils/bit_reader.c \
-    src/utils/color_cache.c \
-    src/utils/filters.c \
-    src/utils/huffman.c \
-    src/utils/quant_levels_dec.c \
-    src/utils/random.c \
-    src/utils/rescaler.c \
-    src/utils/thread.c \
+    src/utils/bit_reader_utils.c \
+    src/utils/color_cache_utils.c \
+    src/utils/filters_utils.c \
+    src/utils/huffman_utils.c \
+    src/utils/quant_levels_dec_utils.c \
+    src/utils/random_utils.c \
+    src/utils/rescaler_utils.c \
+    src/utils/thread_utils.c \
     src/utils/utils.c \
 
 utils_enc_srcs := \
-    src/utils/bit_writer.c \
-    src/utils/huffman_encode.c \
-    src/utils/quant_levels.c \
+    src/utils/bit_writer_utils.c \
+    src/utils/huffman_encode_utils.c \
+    src/utils/quant_levels_utils.c \
 
 ################################################################################
 # libwebpdecoder
@@ -248,7 +273,9 @@ endif
 
 ################################################################################
 
-include $(LOCAL_PATH)/examples/Android.mk
+WEBP_SRC_PATH := $(LOCAL_PATH)
+include $(WEBP_SRC_PATH)/imageio/Android.mk
+include $(WEBP_SRC_PATH)/examples/Android.mk
 
 ifeq ($(USE_CPUFEATURES),yes)
   $(call import-module,android/cpufeatures)

CMakeLists.txt

@@ -3,12 +3,21 @@ cmake_minimum_required(VERSION 2.8.7)
 project(libwebp C)
 
 # Options for coder / decoder executables.
+option(WEBP_ENABLE_SIMD "Enable any SIMD optimization." ON)
+option(WEBP_ENABLE_WASM "Enable WebAssembly optimizations." OFF)
 option(WEBP_BUILD_CWEBP "Build the cwebp command line tool." OFF)
 option(WEBP_BUILD_DWEBP "Build the dwebp command line tool." OFF)
+option(WEBP_BUILD_GIF2WEBP "Build the gif2webp conversion tool." OFF)
+option(WEBP_BUILD_IMG2WEBP "Build the img2webp animation tool." OFF)
+option(WEBP_BUILD_WEBPINFO "Build the webpinfo command line tool." OFF)
+option(WEBP_BUILD_WEBP_JS "Emscripten build of webp.js." OFF)
 option(WEBP_EXPERIMENTAL_FEATURES "Build with experimental features." OFF)
-option(WEBP_FORCE_ALIGNED "Force aligned memory operations." OFF)
 option(WEBP_ENABLE_SWAP_16BIT_CSP "Enable byte swap for 16 bit colorspaces." OFF)
 
+if(WEBP_BUILD_WEBP_JS OR WEBP_ENABLE_WASM)
+  set(WEBP_ENABLE_SIMD OFF)
+endif()
+
 set(WEBP_DEP_LIBRARIES)
 set(WEBP_DEP_INCLUDE_DIRS)
 
@@ -20,11 +29,18 @@ endif()
 
 include(cmake/config.h.cmake)
 
+# Extract the version of the library.
+file(READ ${CMAKE_CURRENT_SOURCE_DIR}/configure.ac SOURCE_FILE)
+string(REGEX MATCH "[0-9.]+" WEBP_VERSION ${SOURCE_FILE})
+
 ################################################################################
 # Options.
 if(WEBP_ENABLE_SWAP_16BIT_CSP)
   add_definitions(-DWEBP_SWAP_16BIT_CSP)
 endif()
+if(WEBP_ENABLE_WASM)
+  add_definitions(-DWEBP_USE_WASM)
+endif()
 
 ################################################################################
 # Android only.
@@ -38,48 +54,110 @@ if(ANDROID)
   set(WEBP_DEP_INCLUDE_DIRS ${WEBP_DEP_INCLUDE_DIRS}
     ${ANDROID_NDK}/sources/android/cpufeatures
   )
+  add_definitions(-DHAVE_CPU_FEATURES_H)
 endif()
 
 ################################################################################
 # WebP source files.
 # Read the Makefile.am to get the source files.
-set(WEBP_SRCS)
 
-function(parse_Makefile_am FOLDER WEBP_SRCS)
+# We expect the Makefiles to define the sources as defined in
+# the first regex. E.g.:
+# libimagedec_la_SOURCES  = image_dec.c image_dec.h
+function(parse_Makefile_am FOLDER VAR SRC_REGEX)
   file(READ ${FOLDER}/Makefile.am MAKEFILE_AM)
-  string(REGEX MATCHALL "_SOURCES \\+= [^\n]*"
+  string(REGEX MATCHALL "${SRC_REGEX}_SOURCES[ ]*\\+?=[ ]+[0-9a-z\\._ ]*"
     FILES_PER_LINE ${MAKEFILE_AM}
   )
-  set(SRCS ${WEBP_SRCS})
+  set(SRCS ${${VAR}})
   foreach(FILES ${FILES_PER_LINE})
-    string(SUBSTRING ${FILES} 12 -1 FILES)
-    string(REGEX MATCHALL "[0-9a-z\\._]+"
-      FILES ${FILES}
-    )
-    foreach(FILE ${FILES})
-      list(APPEND SRCS ${FOLDER}/${FILE})
-    endforeach()
+    string(FIND ${FILES} "=" OFFSET)
+    math(EXPR OFFSET "${OFFSET} + 2")
+    string(SUBSTRING ${FILES} ${OFFSET} -1 FILES)
+    if(FILES)
+      string(REGEX MATCHALL "[0-9a-z\\._]+"
+        FILES ${FILES}
+      )
+      foreach(FILE ${FILES})
+        list(APPEND SRCS ${FOLDER}/${FILE})
+      endforeach()
+    endif()
   endforeach()
-  set(WEBP_SRCS ${SRCS} PARENT_SCOPE)
+  set(${VAR} ${SRCS} PARENT_SCOPE)
 endfunction()
 
-parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/dec "${WEBP_SRCS}")
-parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/demux "${WEBP_SRCS}")
-parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/dsp "${WEBP_SRCS}")
-parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/enc "${WEBP_SRCS}")
-parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/utils "${WEBP_SRCS}")
+set(WEBP_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/src)
+parse_Makefile_am(${WEBP_SRC_DIR}/dec "WEBP_DEC_SRCS" "")
+parse_Makefile_am(${WEBP_SRC_DIR}/demux "WEBP_DEMUX_SRCS" "")
+parse_Makefile_am(${WEBP_SRC_DIR}/dsp "WEBP_DSP_COMMON_SRCS" "COMMON")
+parse_Makefile_am(${WEBP_SRC_DIR}/dsp "WEBP_DSP_ENC_SRCS" "ENC")
+parse_Makefile_am(${WEBP_SRC_DIR}/dsp "WEBP_DSP_ENC_SRCS" "dsp_[^ ]*")
+parse_Makefile_am(${WEBP_SRC_DIR}/dsp "WEBP_DSP_DEC_SRCS" "decode_[^ ]*")
+parse_Makefile_am(${WEBP_SRC_DIR}/enc "WEBP_ENC_SRCS" "")
+parse_Makefile_am(${WEBP_SRC_DIR}/utils "WEBP_UTILS_COMMON_SRCS" "COMMON")
+parse_Makefile_am(${WEBP_SRC_DIR}/utils "WEBP_UTILS_ENC_SRCS" "ENC")
+parse_Makefile_am(${WEBP_SRC_DIR}/utils "WEBP_UTILS_DEC_SRCS" "decode_[^ ]*")
 
 # Remove the files specific to SIMD we don't use.
 foreach(FILE ${WEBP_SIMD_FILES_NOT_TO_INCLUDE})
-  list(REMOVE_ITEM WEBP_SRCS ${FILE})
+  list(REMOVE_ITEM WEBP_DSP_ENC_SRCS ${FILE})
+  list(REMOVE_ITEM WEBP_DSP_DEC_SRCS ${FILE})
 endforeach()
 
-# Build the library.
+### Define the mandatory libraries.
+# Build the webpdecoder library.
 add_definitions(-Wall)
 include_directories(${CMAKE_CURRENT_SOURCE_DIR}/src/ ${WEBP_DEP_INCLUDE_DIRS})
-add_library(webp ${WEBP_SRCS})
+add_library(webpdecode OBJECT ${WEBP_DEC_SRCS})
+add_library(webpdspdecode OBJECT ${WEBP_DSP_COMMON_SRCS} ${WEBP_DSP_DEC_SRCS})
+add_library(webputilsdecode OBJECT ${WEBP_UTILS_COMMON_SRCS}
+  ${WEBP_UTILS_DEC_SRCS})
+add_library(webpdecoder $<TARGET_OBJECTS:webpdecode>
+  $<TARGET_OBJECTS:webpdspdecode> $<TARGET_OBJECTS:webputilsdecode>)
+target_link_libraries(webpdecoder ${WEBP_DEP_LIBRARIES})
+
+# Build the webp library.
+add_library(webpencode OBJECT ${WEBP_ENC_SRCS})
+add_library(webpdsp OBJECT ${WEBP_DSP_COMMON_SRCS} ${WEBP_DSP_DEC_SRCS}
+  ${WEBP_DSP_ENC_SRCS})
+add_library(webputils OBJECT ${WEBP_UTILS_COMMON_SRCS} ${WEBP_UTILS_DEC_SRCS}
+  ${WEBP_UTILS_ENC_SRCS})
+add_library(webp $<TARGET_OBJECTS:webpdecode> $<TARGET_OBJECTS:webpdsp>
+  $<TARGET_OBJECTS:webpencode> $<TARGET_OBJECTS:webputils>)
 target_link_libraries(webp ${WEBP_DEP_LIBRARIES})
 
+# Make sure the OBJECT libraries are built with position independent code
+# (it is not ON by default).
+set_target_properties(webpdecode webpdspdecode webputilsdecode
+  webpencode webpdsp webputils PROPERTIES POSITION_INDEPENDENT_CODE ON)
+
+# Build the webp demux library.
+add_library(webpdemux ${WEBP_DEMUX_SRCS})
+target_link_libraries(webpdemux webp)
+
+# Set the version numbers.
+function(parse_version FILE NAME VAR)
+  file(READ ${CMAKE_CURRENT_SOURCE_DIR}/src/${FILE} SOURCE_FILE)
+  string(REGEX MATCH "${NAME}_la_LDFLAGS[^\n]* -version-info [0-9:]+" TMP
+    ${SOURCE_FILE})
+  string(REGEX MATCH "[0-9:]+" TMP ${TMP})
+  string(REGEX REPLACE ":" "." VERSION ${TMP})
+  set(${VAR} "${VERSION}" PARENT_SCOPE)
+endfunction()
+parse_version(Makefile.am webp WEBP_WEBP_SOVERSION)
+set_target_properties(webp PROPERTIES VERSION ${WEBP_VERSION}
+  SOVERSION ${WEBP_WEBP_SOVERSION})
+parse_version(Makefile.am webpdecoder WEBP_DECODER_SOVERSION)
+set_target_properties(webpdecoder PROPERTIES VERSION ${WEBP_VERSION}
+  SOVERSION ${WEBP_DECODER_SOVERSION})
+parse_version(demux/Makefile.am webpdemux WEBP_DEMUX_SOVERSION)
+set_target_properties(webpdemux PROPERTIES VERSION ${WEBP_VERSION}
+  SOVERSION ${WEBP_DEMUX_SOVERSION})
+
+# Define the libraries to install.
+set(INSTALLED_LIBRARIES webpdecoder webp webpdemux)
+
+### Deal with SIMD.
 # Change the compile flags for SIMD files we use.
 list(LENGTH WEBP_SIMD_FILES_TO_INCLUDE WEBP_SIMD_FILES_TO_INCLUDE_LENGTH)
 math(EXPR WEBP_SIMD_FILES_TO_INCLUDE_RANGE
@@ -89,63 +167,176 @@ math(EXPR WEBP_SIMD_FILES_TO_INCLUDE_RANGE
 foreach(I_FILE RANGE ${WEBP_SIMD_FILES_TO_INCLUDE_RANGE})
   list(GET WEBP_SIMD_FILES_TO_INCLUDE ${I_FILE} FILE)
   list(GET WEBP_SIMD_FLAGS_TO_INCLUDE ${I_FILE} SIMD_COMPILE_FLAG)
-  set_source_files_properties(${FILE} PROPERTIES
-    COMPILE_FLAGS ${SIMD_COMPILE_FLAG}
-  )
+  if(NOT ${SIMD_COMPILE_FLAG} STREQUAL "NOTFOUND")
+    set_source_files_properties(${FILE} PROPERTIES
+      COMPILE_FLAGS ${SIMD_COMPILE_FLAG}
+    )
+  endif()
 endforeach()
 
 # Build the executables if asked for.
-if(WEBP_BUILD_CWEBP OR WEBP_BUILD_DWEBP)
+if(WEBP_BUILD_CWEBP OR WEBP_BUILD_DWEBP OR
+   WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP OR WEBP_BUILD_WEBP_JS)
   # Example utility library.
-  set(exampleutil_SRCS
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/example_util.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/example_util.h
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "EXAMPLEUTIL_SRCS"
+    "example_util_[^ ]*")
+  list(APPEND EXAMPLEUTIL_SRCS
     ${CMAKE_CURRENT_SOURCE_DIR}/examples/stopwatch.h)
-  add_library(exampleutil ${exampleutil_SRCS})
-  target_link_libraries(exampleutil webp ${WEBP_DEP_LIBRARIES})
-endif()
+  add_library(exampleutil ${EXAMPLEUTIL_SRCS})
+
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/imageio "IMAGEIOUTILS_SRCS"
+    "imageio_util_[^ ]*")
+  add_library(imageioutil ${IMAGEIOUTILS_SRCS})
+  target_link_libraries(imageioutil webp)
 
-if(WEBP_BUILD_CWEBP)
   # Image-decoding utility library.
-  set(exampledec_SRCS
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/image_dec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/image_dec.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/jpegdec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/jpegdec.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/metadata.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/metadata.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/pngdec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/pngdec.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/tiffdec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/tiffdec.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/webpdec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/webpdec.h
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/wicdec.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/wicdec.h)
-  add_library(exampledec ${exampledec_SRCS})
-  target_link_libraries(exampledec webp ${WEBP_DEP_LIBRARIES}
-    ${WEBP_DEP_IMG_LIBRARIES})
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/imageio "IMAGEDEC_SRCS"
+    "imagedec_[^ ]*")
+  add_library(imagedec ${IMAGEDEC_SRCS})
+  target_link_libraries(imagedec imageioutil webp ${WEBP_DEP_IMG_LIBRARIES})
+
+  # Image-encoding utility library.
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/imageio "IMAGEENC_SRCS"
+    "imageenc_[^ ]*")
+  add_library(imageenc ${IMAGEENC_SRCS})
+  target_link_libraries(imageenc webp)
 endif()
 
 if(WEBP_BUILD_DWEBP)
   # dwebp
   include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
-  add_executable(dwebp
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/dwebp.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/stopwatch.h
-  )
-  target_link_libraries(dwebp webp exampleutil ${WEBP_DEP_LIBRARIES}
-    ${WEBP_DEP_IMG_LIBRARIES}
-  )
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "DWEBP_SRCS"
+    "dwebp")
+  add_executable(dwebp ${DWEBP_SRCS})
+  target_link_libraries(dwebp exampleutil imagedec imageenc webpdecoder)
+  install(TARGETS dwebp RUNTIME DESTINATION bin)
 endif()
 
 if(WEBP_BUILD_CWEBP)
   # cwebp
   include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
-  add_executable(cwebp
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/cwebp.c
-    ${CMAKE_CURRENT_SOURCE_DIR}/examples/stopwatch.h)
-  target_link_libraries(cwebp exampledec webp exampleutil
-    ${WEBP_DEP_LIBRARIES} ${WEBP_DEP_IMG_LIBRARIES}
-  )
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "CWEBP_SRCS"
+    "cwebp")
+  add_executable(cwebp ${CWEBP_SRCS})
+  target_link_libraries(cwebp exampleutil imagedec webp)
+  install(TARGETS cwebp RUNTIME DESTINATION bin)
 endif()
+
+if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP)
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/mux "WEBP_MUX_SRCS"
+    "")
+  add_library(webpmux ${WEBP_MUX_SRCS})
+  target_link_libraries(webpmux webp)
+  parse_version(mux/Makefile.am webpmux WEBP_MUX_SOVERSION)
+  set_target_properties(webpmux PROPERTIES VERSION ${WEBP_VERSION}
+    SOVERSION ${WEBP_MUX_SOVERSION})
+  list(APPEND INSTALLED_LIBRARIES webpmux)
+endif()
+
+if(WEBP_BUILD_GIF2WEBP)
+  # gif2webp
+  include_directories(${WEBP_DEP_GIF_INCLUDE_DIRS})
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "GIF2WEBP_SRCS"
+    "gif2webp")
+  add_executable(gif2webp ${GIF2WEBP_SRCS})
+  target_link_libraries(gif2webp exampleutil imageioutil webp webpmux
+    ${WEBP_DEP_GIF_LIBRARIES})
+  install(TARGETS gif2webp RUNTIME DESTINATION bin)
+endif()
+
+if(WEBP_BUILD_IMG2WEBP)
+  # img2webp
+  include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "IMG2WEBP_SRCS"
+    "img2webp")
+  add_executable(img2webp ${IMG2WEBP_SRCS})
+  target_link_libraries(img2webp exampleutil imagedec imageioutil webp webpmux)
+  install(TARGETS img2webp RUNTIME DESTINATION bin)
+endif()
+
+if (WEBP_BUILD_WEBPINFO)
+  # webpinfo
+  include_directories(${WEBP_DEP_IMG_INCLUDE_DIRS})
+  parse_Makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/examples "WEBPINFO_SRCS"
+    "webpinfo")
+  add_executable(webpinfo ${WEBPINFO_SRCS})
+  target_link_libraries(webpinfo exampleutil imageioutil)
+  install(TARGETS webpinfo RUNTIME DESTINATION bin)
+endif()
+
+if(WEBP_BUILD_WEBP_JS)
+  # JavaScript version
+  add_executable(webp_js
+                 ${CMAKE_CURRENT_SOURCE_DIR}/extras/webp_to_sdl.c)
+  target_link_libraries(webp_js webpdecoder SDL)
+  set_target_properties(webp_js PROPERTIES LINK_FLAGS
+      "-s EXPORTED_FUNCTIONS='[\"_WebpToSDL\"]' -s INVOKE_RUN=0")
+  set_target_properties(webp_js PROPERTIES OUTPUT_NAME webp)
+  target_compile_definitions(webp_js PUBLIC EMSCRIPTEN WEBP_HAVE_SDL)
+
+  # WASM version
+  add_executable(webp_wasm
+                 ${CMAKE_CURRENT_SOURCE_DIR}/extras/webp_to_sdl.c)
+  target_link_libraries(webp_wasm webpdecoder SDL)
+  set_target_properties(webp_wasm PROPERTIES LINK_FLAGS
+      "-s WASM=1 -s 'BINARYEN_METHOD=\"native-wasm\"' \
+      -s EXPORTED_FUNCTIONS='[\"_WebpToSDL\"]' -s INVOKE_RUN=0")
+  target_compile_definitions(webp_wasm PUBLIC EMSCRIPTEN WEBP_HAVE_SDL)
+
+  target_compile_definitions(webpdecoder PUBLIC EMSCRIPTEN)
+endif()
+
+# Install the different headers and libraries.
+install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/decode.h
+              ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/demux.h
+              ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/encode.h
+              ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/mux.h
+              ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/mux_types.h
+              ${CMAKE_CURRENT_SOURCE_DIR}/src/webp/types.h
+        DESTINATION include/webp)
+install(TARGETS ${INSTALLED_LIBRARIES}
+        LIBRARY DESTINATION lib
+        ARCHIVE DESTINATION lib)
+
+# Create the CMake version file.
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+  "${CMAKE_CURRENT_BINARY_DIR}/WebPConfigVersion.cmake"
+  VERSION ${WEBP_VERSION}
+  COMPATIBILITY AnyNewerVersion
+)
+
+# Create the Config file.
+include(CMakePackageConfigHelpers)
+set(ConfigPackageLocation share/WebP/cmake/)
+configure_package_config_file(
+  ${CMAKE_CURRENT_SOURCE_DIR}/cmake/WebPConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/WebPConfig.cmake
+  INSTALL_DESTINATION ${ConfigPackageLocation}
+)
+
+# Install the generated CMake files.
+install(
+  FILES "${CMAKE_CURRENT_BINARY_DIR}/WebPConfigVersion.cmake"
+        "${CMAKE_CURRENT_BINARY_DIR}/WebPConfig.cmake"
+  DESTINATION ${ConfigPackageLocation}
+)
+
+# Install the man pages.
+set(MAN_PAGES cwebp.1 dwebp.1 gif2webp.1 img2webp.1 vwebp.1 webpmux.1
+  webpinfo.1)
+set(EXEC_BUILDS "CWEBP" "DWEBP" "GIF2WEBP" "IMG2WEBP" "VWEBP" "WEBPMUX"
+  "WEBPINFO")
+list(LENGTH MAN_PAGES MAN_PAGES_LENGTH)
+math(EXPR MAN_PAGES_RANGE "${MAN_PAGES_LENGTH} - 1")
+
+foreach(I_MAN RANGE ${MAN_PAGES_RANGE})
+  list(GET EXEC_BUILDS ${I_MAN} EXEC_BUILD)
+  if(WEBP_BUILD_${EXEC_BUILD})
+    list(GET MAN_PAGES ${I_MAN} MAN_PAGE)
+    install(FILES ${CMAKE_CURRENT_SOURCE_DIR}/man/${MAN_PAGE}
+      DESTINATION ${CMAKE_INSTALL_PREFIX}/share/man/man1
+      COMPONENT doc
+    )
+  endif()
+endforeach()

Makefile.am

@@ -1,3 +1,9 @@
 ACLOCAL_AMFLAGS = -I m4
-SUBDIRS = src examples man
+SUBDIRS = src imageio man
 EXTRA_DIST = COPYING autogen.sh
+
+if WANT_EXTRAS
+  SUBDIRS += extras
+endif
+
+SUBDIRS += examples

Makefile.vc

@@ -37,6 +37,8 @@ LNKDLL     = link.exe /DLL $(NOLOGO)
 LNKEXE     = link.exe $(NOLOGO)
 LNKLIB     = lib.exe $(NOLOGO)
 MT         = mt.exe $(NOLOGO)
+RCNODBG    = rc.exe $(NOLOGO) /l"0x0409"  # 0x409 = U.S. English
+RCDEBUG    = $(RCNODBG) /D_DEBUG
 
 !IF "$(ARCH)" == "ARM"
 CFLAGS = $(CFLAGS) /DWINAPI_FAMILY=WINAPI_FAMILY_PHONE_APP /DWEBP_USE_THREAD
@@ -82,6 +84,8 @@ OUTPUT_DIRS = $(DIRBIN) $(DIRINC) $(DIRLIB) \
               $(DIROBJ)\dsp \
               $(DIROBJ)\enc \
               $(DIROBJ)\examples \
+              $(DIROBJ)\extras \
+              $(DIROBJ)\imageio \
               $(DIROBJ)\mux \
               $(DIROBJ)\utils \
 
@@ -99,9 +103,11 @@ LIBWEBPMUX_BASENAME = $(LIBWEBPMUX_BASENAME)_debug
 LIBWEBPDEMUX_BASENAME = $(LIBWEBPDEMUX_BASENAME)_debug
 !ELSE IF "$(CFG)" == "release-dynamic"
 CC        = $(CCNODBG)
+RC        = $(RCNODBG)
 DLLBUILD  = TRUE
 !ELSE IF "$(CFG)" == "debug-dynamic"
 CC        = $(CCDEBUG)
+RC        = $(RCDEBUG)
 RTLIB     = $(RTLIBD)
 DLLBUILD  = TRUE
 LIBWEBPDECODER_BASENAME = $(LIBWEBPDECODER_BASENAME)_debug
@@ -169,16 +175,16 @@ CFGSET = TRUE
 #
 
 DEC_OBJS = \
-    $(DIROBJ)\dec\alpha.obj \
-    $(DIROBJ)\dec\buffer.obj \
-    $(DIROBJ)\dec\frame.obj \
-    $(DIROBJ)\dec\idec.obj \
-    $(DIROBJ)\dec\io.obj \
-    $(DIROBJ)\dec\quant.obj \
-    $(DIROBJ)\dec\tree.obj \
-    $(DIROBJ)\dec\vp8.obj \
-    $(DIROBJ)\dec\vp8l.obj \
-    $(DIROBJ)\dec\webp.obj \
+    $(DIROBJ)\dec\alpha_dec.obj \
+    $(DIROBJ)\dec\buffer_dec.obj \
+    $(DIROBJ)\dec\frame_dec.obj \
+    $(DIROBJ)\dec\idec_dec.obj \
+    $(DIROBJ)\dec\io_dec.obj \
+    $(DIROBJ)\dec\quant_dec.obj \
+    $(DIROBJ)\dec\tree_dec.obj \
+    $(DIROBJ)\dec\vp8_dec.obj \
+    $(DIROBJ)\dec\vp8l_dec.obj \
+    $(DIROBJ)\dec\webp_dec.obj \
 
 DEMUX_OBJS = \
     $(DIROBJ)\demux\anim_decode.obj \
@@ -187,6 +193,7 @@ DEMUX_OBJS = \
 DSP_DEC_OBJS = \
     $(DIROBJ)\dsp\alpha_processing.obj \
     $(DIROBJ)\dsp\alpha_processing_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\alpha_processing_neon.obj \
     $(DIROBJ)\dsp\alpha_processing_sse2.obj \
     $(DIROBJ)\dsp\alpha_processing_sse41.obj \
     $(DIROBJ)\dsp\cpu.obj \
@@ -200,23 +207,29 @@ DSP_DEC_OBJS = \
     $(DIROBJ)\dsp\dec_sse41.obj \
     $(DIROBJ)\dsp\filters.obj \
     $(DIROBJ)\dsp\filters_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\filters_msa.obj \
+    $(DIROBJ)\dsp\filters_neon.obj \
     $(DIROBJ)\dsp\filters_sse2.obj \
     $(DIROBJ)\dsp\lossless.obj \
     $(DIROBJ)\dsp\lossless_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\lossless_msa.obj \
     $(DIROBJ)\dsp\lossless_neon.obj \
     $(DIROBJ)\dsp\lossless_sse2.obj \
     $(DIROBJ)\dsp\rescaler.obj \
     $(DIROBJ)\dsp\rescaler_mips32.obj \
     $(DIROBJ)\dsp\rescaler_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\rescaler_msa.obj \
     $(DIROBJ)\dsp\rescaler_neon.obj \
     $(DIROBJ)\dsp\rescaler_sse2.obj \
     $(DIROBJ)\dsp\upsampling.obj \
     $(DIROBJ)\dsp\upsampling_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\upsampling_msa.obj \
     $(DIROBJ)\dsp\upsampling_neon.obj \
     $(DIROBJ)\dsp\upsampling_sse2.obj \
     $(DIROBJ)\dsp\yuv.obj \
     $(DIROBJ)\dsp\yuv_mips32.obj \
     $(DIROBJ)\dsp\yuv_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\yuv_neon.obj \
     $(DIROBJ)\dsp\yuv_sse2.obj \
 
 DSP_ENC_OBJS = \
@@ -231,27 +244,35 @@ DSP_ENC_OBJS = \
     $(DIROBJ)\dsp\enc_avx2.obj \
     $(DIROBJ)\dsp\enc_mips32.obj \
     $(DIROBJ)\dsp\enc_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\enc_msa.obj \
     $(DIROBJ)\dsp\enc_neon.obj \
     $(DIROBJ)\dsp\enc_sse2.obj \
     $(DIROBJ)\dsp\enc_sse41.obj \
     $(DIROBJ)\dsp\lossless_enc.obj \
     $(DIROBJ)\dsp\lossless_enc_mips32.obj \
     $(DIROBJ)\dsp\lossless_enc_mips_dsp_r2.obj \
+    $(DIROBJ)\dsp\lossless_enc_msa.obj \
     $(DIROBJ)\dsp\lossless_enc_neon.obj \
     $(DIROBJ)\dsp\lossless_enc_sse2.obj \
     $(DIROBJ)\dsp\lossless_enc_sse41.obj \
+    $(DIROBJ)\dsp\ssim.obj \
+    $(DIROBJ)\dsp\ssim_sse2.obj \
 
 EX_ANIM_UTIL_OBJS = \
     $(DIROBJ)\examples\anim_util.obj \
 
-EX_FORMAT_DEC_OBJS = \
-    $(DIROBJ)\examples\image_dec.obj \
-    $(DIROBJ)\examples\jpegdec.obj \
-    $(DIROBJ)\examples\metadata.obj \
-    $(DIROBJ)\examples\pngdec.obj \
-    $(DIROBJ)\examples\tiffdec.obj \
-    $(DIROBJ)\examples\webpdec.obj \
-    $(DIROBJ)\examples\wicdec.obj \
+IMAGEIO_DEC_OBJS = \
+    $(DIROBJ)\imageio\image_dec.obj \
+    $(DIROBJ)\imageio\jpegdec.obj \
+    $(DIROBJ)\imageio\metadata.obj \
+    $(DIROBJ)\imageio\pngdec.obj \
+    $(DIROBJ)\imageio\pnmdec.obj \
+    $(DIROBJ)\imageio\tiffdec.obj \
+    $(DIROBJ)\imageio\webpdec.obj \
+    $(DIROBJ)\imageio\wicdec.obj \
+
+IMAGEIO_ENC_OBJS = \
+    $(DIROBJ)\imageio\image_enc.obj \
 
 EX_GIF_DEC_OBJS = \
     $(DIROBJ)\examples\gifdec.obj \
@@ -260,28 +281,37 @@ EX_UTIL_OBJS = \
     $(DIROBJ)\examples\example_util.obj \
 
 ENC_OBJS = \
-    $(DIROBJ)\enc\alpha.obj \
-    $(DIROBJ)\enc\analysis.obj \
-    $(DIROBJ)\enc\backward_references.obj \
-    $(DIROBJ)\enc\config.obj \
-    $(DIROBJ)\enc\cost.obj \
-    $(DIROBJ)\enc\delta_palettization.obj \
-    $(DIROBJ)\enc\filter.obj \
-    $(DIROBJ)\enc\frame.obj \
-    $(DIROBJ)\enc\histogram.obj \
-    $(DIROBJ)\enc\iterator.obj \
-    $(DIROBJ)\enc\near_lossless.obj \
-    $(DIROBJ)\enc\picture.obj \
-    $(DIROBJ)\enc\picture_csp.obj \
-    $(DIROBJ)\enc\picture_psnr.obj \
-    $(DIROBJ)\enc\picture_rescale.obj \
-    $(DIROBJ)\enc\picture_tools.obj \
-    $(DIROBJ)\enc\quant.obj \
-    $(DIROBJ)\enc\syntax.obj \
-    $(DIROBJ)\enc\token.obj \
-    $(DIROBJ)\enc\tree.obj \
-    $(DIROBJ)\enc\vp8l.obj \
-    $(DIROBJ)\enc\webpenc.obj \
+    $(DIROBJ)\enc\alpha_enc.obj \
+    $(DIROBJ)\enc\analysis_enc.obj \
+    $(DIROBJ)\enc\backward_references_cost_enc.obj \
+    $(DIROBJ)\enc\backward_references_enc.obj \
+    $(DIROBJ)\enc\config_enc.obj \
+    $(DIROBJ)\enc\cost_enc.obj \
+    $(DIROBJ)\enc\delta_palettization_enc.obj \
+    $(DIROBJ)\enc\filter_enc.obj \
+    $(DIROBJ)\enc\frame_enc.obj \
+    $(DIROBJ)\enc\histogram_enc.obj \
+    $(DIROBJ)\enc\iterator_enc.obj \
+    $(DIROBJ)\enc\near_lossless_enc.obj \
+    $(DIROBJ)\enc\picture_enc.obj \
+    $(DIROBJ)\enc\picture_csp_enc.obj \
+    $(DIROBJ)\enc\picture_psnr_enc.obj \
+    $(DIROBJ)\enc\picture_rescale_enc.obj \
+    $(DIROBJ)\enc\picture_tools_enc.obj \
+    $(DIROBJ)\enc\predictor_enc.obj \
+    $(DIROBJ)\enc\quant_enc.obj \
+    $(DIROBJ)\enc\syntax_enc.obj \
+    $(DIROBJ)\enc\token_enc.obj \
+    $(DIROBJ)\enc\tree_enc.obj \
+    $(DIROBJ)\enc\vp8l_enc.obj \
+    $(DIROBJ)\enc\webp_enc.obj \
+
+EXTRAS_OBJS = \
+    $(DIROBJ)\extras\extras.obj \
+    $(DIROBJ)\extras\quality_estimate.obj \
+
+IMAGEIO_UTIL_OBJS = \
+    $(DIROBJ)\imageio\imageio_util.obj \
 
 MUX_OBJS = \
     $(DIROBJ)\mux\anim_encode.obj \
@@ -290,20 +320,20 @@ MUX_OBJS = \
     $(DIROBJ)\mux\muxread.obj \
 
 UTILS_DEC_OBJS = \
-    $(DIROBJ)\utils\bit_reader.obj \
-    $(DIROBJ)\utils\color_cache.obj \
-    $(DIROBJ)\utils\filters.obj \
-    $(DIROBJ)\utils\huffman.obj \
-    $(DIROBJ)\utils\quant_levels_dec.obj \
-    $(DIROBJ)\utils\rescaler.obj \
-    $(DIROBJ)\utils\random.obj \
-    $(DIROBJ)\utils\thread.obj \
+    $(DIROBJ)\utils\bit_reader_utils.obj \
+    $(DIROBJ)\utils\color_cache_utils.obj \
+    $(DIROBJ)\utils\filters_utils.obj \
+    $(DIROBJ)\utils\huffman_utils.obj \
+    $(DIROBJ)\utils\quant_levels_dec_utils.obj \
+    $(DIROBJ)\utils\rescaler_utils.obj \
+    $(DIROBJ)\utils\random_utils.obj \
+    $(DIROBJ)\utils\thread_utils.obj \
     $(DIROBJ)\utils\utils.obj \
 
 UTILS_ENC_OBJS = \
-    $(DIROBJ)\utils\bit_writer.obj \
-    $(DIROBJ)\utils\huffman_encode.obj \
-    $(DIROBJ)\utils\quant_levels.obj \
+    $(DIROBJ)\utils\bit_writer_utils.obj \
+    $(DIROBJ)\utils\huffman_encode_utils.obj \
+    $(DIROBJ)\utils\quant_levels_utils.obj \
 
 LIBWEBPDECODER_OBJS = $(DEC_OBJS) $(DSP_DEC_OBJS) $(UTILS_DEC_OBJS)
 LIBWEBP_OBJS = $(LIBWEBPDECODER_OBJS) $(ENC_OBJS) $(DSP_ENC_OBJS) \
@@ -317,7 +347,10 @@ ex: $(OUT_LIBS)
 all: ex
 !ELSE
 OUT_EXAMPLES = $(DIRBIN)\cwebp.exe $(DIRBIN)\dwebp.exe
-EXTRA_EXAMPLES = $(DIRBIN)\vwebp.exe $(DIRBIN)\webpmux.exe
+EXTRA_EXAMPLES = $(DIRBIN)\vwebp.exe $(DIRBIN)\webpmux.exe \
+                 $(DIRBIN)\img2webp.exe $(DIRBIN)\get_disto.exe \
+                 $(DIRBIN)\webp_quality.exe $(DIRBIN)\vwebp_sdl.exe \
+                 $(DIRBIN)\webpinfo.exe
 
 ex: $(OUT_LIBS) $(OUT_EXAMPLES)
 all: ex $(EXTRA_EXAMPLES)
@@ -327,18 +360,38 @@ gif2webp: $(DIRBIN)\gif2webp.exe
 anim_diff: $(DIRBIN)\anim_diff.exe
 
 $(DIRBIN)\anim_diff.exe: $(DIROBJ)\examples\anim_diff.obj $(EX_ANIM_UTIL_OBJS)
-$(DIRBIN)\anim_diff.exe: $(EX_UTIL_OBJS)
+$(DIRBIN)\anim_diff.exe: $(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS)
 $(DIRBIN)\anim_diff.exe: $(EX_GIF_DEC_OBJS) $(LIBWEBPDEMUX) $(LIBWEBP)
-$(DIRBIN)\cwebp.exe: $(DIROBJ)\examples\cwebp.obj $(EX_FORMAT_DEC_OBJS)
-$(DIRBIN)\dwebp.exe: $(DIROBJ)\examples\dwebp.obj
+$(DIRBIN)\cwebp.exe: $(DIROBJ)\examples\cwebp.obj $(IMAGEIO_DEC_OBJS)
+$(DIRBIN)\cwebp.exe: $(IMAGEIO_UTIL_OBJS)
+$(DIRBIN)\dwebp.exe: $(DIROBJ)\examples\dwebp.obj $(IMAGEIO_DEC_OBJS)
+$(DIRBIN)\dwebp.exe: $(IMAGEIO_ENC_OBJS)
+$(DIRBIN)\dwebp.exe: $(IMAGEIO_UTIL_OBJS)
 $(DIRBIN)\gif2webp.exe: $(DIROBJ)\examples\gif2webp.obj $(EX_GIF_DEC_OBJS)
-$(DIRBIN)\gif2webp.exe: $(EX_UTIL_OBJS) $(LIBWEBPMUX) $(LIBWEBP)
-$(DIRBIN)\vwebp.exe: $(DIROBJ)\examples\vwebp.obj
-$(DIRBIN)\vwebp.exe: $(EX_UTIL_OBJS) $(LIBWEBPDEMUX) $(LIBWEBP)
+$(DIRBIN)\gif2webp.exe: $(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS) $(LIBWEBPMUX)
+$(DIRBIN)\gif2webp.exe: $(LIBWEBP)
+$(DIRBIN)\vwebp.exe: $(DIROBJ)\examples\vwebp.obj $(EX_UTIL_OBJS)
+$(DIRBIN)\vwebp.exe: $(IMAGEIO_UTIL_OBJS) $(LIBWEBPDEMUX) $(LIBWEBP)
+$(DIRBIN)\vwebp_sdl.exe: $(DIROBJ)\extras\vwebp_sdl.obj
+$(DIRBIN)\vwebp_sdl.exe: $(DIROBJ)\extras\webp_to_sdl.obj
+$(DIRBIN)\vwebp_sdl.exe: $(IMAGEIO_UTIL_OBJS) $(LIBWEBP)
 $(DIRBIN)\webpmux.exe: $(DIROBJ)\examples\webpmux.obj $(LIBWEBPMUX)
-$(DIRBIN)\webpmux.exe: $(EX_UTIL_OBJS) $(LIBWEBP)
+$(DIRBIN)\webpmux.exe: $(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS) $(LIBWEBP)
+$(DIRBIN)\img2webp.exe: $(DIROBJ)\examples\img2webp.obj $(LIBWEBPMUX)
+$(DIRBIN)\img2webp.exe: $(IMAGEIO_DEC_OBJS)
+$(DIRBIN)\img2webp.exe: $(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS) $(LIBWEBP)
+$(DIRBIN)\get_disto.exe: $(DIROBJ)\extras\get_disto.obj
+$(DIRBIN)\get_disto.exe: $(IMAGEIO_DEC_OBJS) $(IMAGEIO_UTIL_OBJS) $(LIBWEBP)
+$(DIRBIN)\webp_quality.exe: $(DIROBJ)\extras\webp_quality.obj
+$(DIRBIN)\webp_quality.exe: $(IMAGEIO_UTIL_OBJS)
+$(DIRBIN)\webp_quality.exe: $(EXTRAS_OBJS) $(LIBWEBP)
+$(DIRBIN)\webpinfo.exe: $(DIROBJ)\examples\webpinfo.obj
+$(DIRBIN)\webpinfo.exe: $(IMAGEIO_DEC_OBJS)
+$(DIRBIN)\webpinfo.exe: $(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS) $(LIBWEBP)
+
 $(OUT_EXAMPLES): $(EX_UTIL_OBJS) $(LIBWEBP)
-$(EX_UTIL_OBJS) $(EX_FORMAT_DEC_OBJS): $(OUTPUT_DIRS)
+$(EX_UTIL_OBJS) $(IMAGEIO_UTIL_OBJS): $(OUTPUT_DIRS)
+$(IMAGEIO_DEC_OBJS) $(IMAGEIO_ENC_OBJS) $(EXTRAS_OBJS): $(OUTPUT_DIRS)
 !ENDIF  # ARCH == ARM
 
 experimental:
@@ -360,8 +413,17 @@ $(LIBWEBP_OBJS) $(LIBWEBPMUX_OBJS) $(LIBWEBPDEMUX_OBJS): \
 {$(DIROBJ)}.c{$(DIROBJ)}.obj:
 	$(CC) $(CFLAGS) /Fd$(LIBWEBP_PDBNAME) /Fo$@  $<
 
-$(LIBWEBPMUX): $(LIBWEBP)
-$(LIBWEBPDEMUX): $(LIBWEBP)
+{src}.rc{$(DIROBJ)}.res:
+	$(RC) /fo$@ $<
+{src\demux}.rc{$(DIROBJ)\demux}.res:
+	$(RC) /fo$@ $<
+{src\mux}.rc{$(DIROBJ)\mux}.res:
+	$(RC) /fo$@ $<
+
+$(LIBWEBP): $(DIROBJ)\$(LIBWEBP_BASENAME:_debug=).res
+$(LIBWEBPDECODER): $(DIROBJ)\$(LIBWEBPDECODER_BASENAME:_debug=).res
+$(LIBWEBPMUX): $(LIBWEBP) $(DIROBJ)\mux\$(LIBWEBPMUX_BASENAME:_debug=).res
+$(LIBWEBPDEMUX): $(LIBWEBP) $(DIROBJ)\demux\$(LIBWEBPDEMUX_BASENAME:_debug=).res
 
 $(LIBWEBPDECODER) $(LIBWEBP) $(LIBWEBPMUX) $(LIBWEBPDEMUX):
 	$(LNKDLL) /out:$(DIRBIN)\$(@B:_dll=.dll) /implib:$@ $(LFLAGS) $**
@@ -406,6 +468,10 @@ $(DIROBJ)\examples\gifdec.obj: examples\gifdec.c
 # Batch rules
 {examples}.c{$(DIROBJ)\examples}.obj::
 	$(CC) $(CFLAGS) /Fd$(DIROBJ)\examples\ /Fo$(DIROBJ)\examples\ $<
+{extras}.c{$(DIROBJ)\extras}.obj::
+	$(CC) $(CFLAGS) /Fd$(DIROBJ)\extras\ /Fo$(DIROBJ)\extras\ $<
+{imageio}.c{$(DIROBJ)\imageio}.obj::
+	$(CC) $(CFLAGS) /Fd$(DIROBJ)\imageio\ /Fo$(DIROBJ)\imageio\ $<
 {src\dec}.c{$(DIROBJ)\dec}.obj::
 	$(CC) $(CFLAGS) /Fd$(LIBWEBP_PDBNAME) /Fo$(DIROBJ)\dec\ $<
 {src\demux}.c{$(DIROBJ)\demux}.obj::
@@ -425,6 +491,12 @@ $(DIROBJ)\examples\gifdec.obj: examples\gifdec.c
 	$(MT) -manifest $@.manifest -outputresource:$@;1
 	del $@.manifest
 
+{$(DIROBJ)\extras}.obj{$(DIRBIN)}.exe:
+	$(LNKEXE) $(LDFLAGS) /OUT:$@ $** \
+	    ole32.lib windowscodecs.lib shlwapi.lib
+	$(MT) -manifest $@.manifest -outputresource:$@;1
+	del $@.manifest
+
 clean::
 	@-erase /s $(DIROBJ)\*.dll 2> NUL
 	@-erase /s $(DIROBJ)\*.exp 2> NUL

NEWS

@@ -1,3 +1,18 @@
+- 1/26/2017: version 0.6.0
+  * lossless performance and compression improvements
+  * miscellaneous performance improvements (SSE2, NEON, MSA)
+  * webpmux gained a -duration option allowing for frame timing modification
+  * new img2webp utility allowing a sequence of images to be converted to
+    animated webp
+  * API changes:
+    - libwebp:
+      WebPPictureSharpARGBToYUVA
+      WebPPlaneDistortion
+    - libwebpmux / gif2webp:
+      WebPAnimEncoderOptions: kmax <= 0 now disables keyframes, kmax == 1
+                              forces all keyframes. See mux.h and the gif2webp
+                              manpage for details.
+
 - 12/13/2016: version 0.5.2
   This is a binary compatible release.
   This release covers CVE-2016-8888 and CVE-2016-9085.

README

@@ -4,7 +4,7 @@
           \__\__/\____/\_____/__/ ____  ___
                 / _/ /    \    \ /  _ \/ _/
                /  \_/   / /   \ \   __/  \__
-               \____/____/\_____/_____/____/v0.5.2
+               \____/____/\_____/_____/____/v0.6.0
 
 Description:
 ============
@@ -113,8 +113,8 @@ make install
 
 CMake:
 ------
-The support for CMake is minimal: it only helps you compile libwebp, cwebp and
-dwebp.
+With CMake, you can compile libwebp, cwebp, dwebp, gif2web, img2webp and the
+JS bindings.
 
 Prerequisites:
 A compiler (e.g., gcc with autotools) and CMake.
@@ -123,18 +123,25 @@ minimal build:
 $ sudo apt-get install build-essential cmake
 
 When building from git sources, you will need to run cmake to generate the
-configure script.
+makefiles.
 
 mkdir build && cd build && cmake ../
 make
 make install
 
-If you also want cwebp or dwebp, you will need to enable them through CMake:
+If you also want any of the executables, you will need to enable them through
+CMake, e.g.:
 
 cmake -DWEBP_BUILD_CWEBP=ON -DWEBP_BUILD_DWEBP=ON ../
 
 or through your favorite interface (like ccmake or cmake-qt-gui).
 
+Finally, once installed, you can also use WebP in your CMake project by doing:
+
+find_package(WebP)
+
+which will define the CMake variables WebP_INCLUDE_DIRS and WebP_LIBRARIES.
+
 Gradle:
 -------
 The support for Gradle is minimal: it only helps you compile libwebp, cwebp and
@@ -241,6 +248,7 @@ Options:
   -sharpness <int> ....... filter sharpness (0:most .. 7:least sharp), default=0
   -strong ................ use strong filter instead of simple (default)
   -nostrong .............. use simple filter instead of strong
+  -sharp_yuv ............. use sharper (and slower) RGB->YUV conversion
   -partition_limit <int> . limit quality to fit the 512k limit on
                            the first partition (0=no degradation ... 100=full)
   -pass <int> ............ analysis pass number (1..10)
@@ -384,6 +392,7 @@ Options are:
 Keyboard shortcuts:
   'c' ................ toggle use of color profile
   'i' ................ overlay file information
+  'd' ................ disable blending & disposal (debug)
   'q' / 'Q' / ESC .... quit
 
 Building:
@@ -412,6 +421,37 @@ $ make -f makefile.unix examples/vwebp
 > nmake /f Makefile.vc CFG=release-static \
     ../obj/x64/release-static/bin/vwebp.exe
 
+Animation creation tool:
+========================
+The utility 'img2webp' can turn a sequence of input images (PNG, JPEG, ...)
+into an animated WebP file. It offers fine control over duration, encoding
+modes, etc.
+
+Usage:
+
+  img2webp [file-level options] [image files...] [per-frame options...]
+
+File-level options (only used at the start of compression):
+ -min_size ............ minimize size
+ -loop <int> .......... loop count (default: 0, = infinite loop)
+ -kmax <int> .......... maximum number of frame between key-frames
+                        (0=only keyframes)
+ -kmin <int> .......... minimum number of frame between key-frames
+                        (0=disable key-frames altogether)
+ -mixed ............... use mixed lossy/lossless automatic mode
+ -v ................... verbose mode
+ -h ................... this help
+
+Per-frame options (only used for subsequent images input):
+ -d <int> ............. frame duration in ms (default: 100)
+ -lossless  ........... use lossless mode (default)
+ -lossy ... ........... use lossy mode
+ -q <float> ........... quality
+ -m <int> ............. method to use
+
+example: img2webp -loop 2 in0.png -lossy in1.jpg
+                  -d 80 in2.tiff -o out.webp
+
 Animated GIF conversion:
 ========================
 Animated GIF files can be converted to WebP files with animation using the

README.mux

@@ -1,7 +1,7 @@
           __   __  ____  ____  ____  __ __  _     __ __
          /  \\/  \/  _ \/  _ \/  _ \/  \  \/ \___/_ / _\
          \       /   __/  _  \   __/      /  /  (_/  /__
-          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v0.3.2
+          \__\__/\_____/_____/__/  \__//_/\_____/__/___/v0.4.0
 
 
 Description:
@@ -25,6 +25,8 @@ A list of options is available using the -help command line flag:
 > webpmux -help
 Usage: webpmux -get GET_OPTIONS INPUT -o OUTPUT
        webpmux -set SET_OPTIONS INPUT -o OUTPUT
+       webpmux -duration DURATION_OPTIONS [-duration ...]
+               INPUT -o OUTPUT
        webpmux -strip STRIP_OPTIONS INPUT -o OUTPUT
        webpmux -frame FRAME_OPTIONS [-frame...] [-loop LOOP_COUNT]
                [-bgcolor BACKGROUND_COLOR] -o OUTPUT
@@ -48,6 +50,17 @@ SET_OPTIONS:
              'file.exif' contains the EXIF metadata to be set
              'file.xmp' contains the XMP metadata to be set
 
+DURATION_OPTIONS:
+ Set duration of selected frames:
+   duration            set duration for each frames
+   duration,frame      set duration of a particular frame
+   duration,start,end  set duration of frames in the
+                        interval [start,end])
+   where: 'duration' is the duration in milliseconds
+          'start' is the start frame index
+          'end' is the inclusive end frame index
+           The special 'end' value '0' means: last frame.
+
 STRIP_OPTIONS:
  Strip color profile/metadata:
    icc       strip ICC profile

README.wasm

@@ -0,0 +1,91 @@
+Description:
+============
+
+This file describes the compilation of libwebp using portable intrinsics /
+WebAssembly (wasm) to native targets using clang and CMake.
+
+Prerequisites:
+==============
+
+- cmake 2.8+
+
+- clang 3.9+ for portable intrinsics support; as wasm progresses a tip of tree
+  build may be necessary.
+
+Building:
+=========
+
+ - configure the project with CMake using:
+
+ $ mkdir -p build && \
+   cd build && \
+   cmake -DWEBP_BUILD_DWEBP=1 -DCMAKE_C_COMPILER=clang -DWEBP_ENABLE_WASM=1 ../
+
+ - compile dwebp using 'make'.
+
+ - Note this currently generates native executables only and is incompatible
+   with -DWEBP_BUILD_WEBP_JS.
+
+Build options:
+==============
+
+- platform specific multiply high (mulhi) implementation, disabled by default.
+  arm: -DCMAKE_C_FLAGS='-DENABLE_NEON_BUILTIN_MULHI_INT16X8 ...'
+  x86: -DCMAKE_C_FLAGS='-DENABLE_X86_BUILTIN_MULHI_INT16X8 ...'
+
+Cross compilation:
+==================
+
+ - arm toolchains can be obtained from:
+   http://www.linaro.org/downloads/
+
+ - the android ndk can be obtained from:
+   https://developer.android.com/ndk/downloads/index.html
+
+armv7:
+------
+
+Android:
+ $ ./android-ndk-r15b/build/tools/make_standalone_toolchain.py \
+   --arch arm --api 24 --stl gnustl --install-dir /opt/android-arm-24
+ $ mkdir -p build && cd build
+ $ cmake ../libwebp \
+   -DWEBP_BUILD_DWEBP=1 \
+   -DCMAKE_C_COMPILER=/opt/android-arm-24/bin/clang \
+   -DCMAKE_PREFIX_PATH=/opt/android-arm-24/sysroot/usr/lib \
+   -DCMAKE_C_FLAGS=-fPIE \
+   -DCMAKE_EXE_LINKER_FLAGS=-Wl,-pie \
+   -DCMAKE_BUILD_TYPE=Release \
+   -DWEBP_ENABLE_WASM=1
+
+Linux:
+ $ gcc_arm=/opt/gcc-arm; target=arm-linux-gnueabihf
+ $ mkdir -p build && cd build
+ $ cmake ../libwebp -DWEBP_BUILD_DWEBP=1 -DWEBP_ENABLE_WASM=1 \
+   -DCMAKE_C_COMPILER=clang \
+   -DCMAKE_C_FLAGS="--target=$target --gcc-toolchain=$gcc_arm --sysroot=$gcc_arm/$target/libc -march=armv7-a -mfpu=neon" \
+   -DCMAKE_PREFIX_PATH=$gcc_arm/$target/libc/usr
+
+aarch64 / arm64:
+----------------
+
+Android:
+ $ ./android-ndk-r15b/build/tools/make_standalone_toolchain.py \
+   --arch arm64 --api 24 --stl gnustl --install-dir /opt/android-arm64-24
+ $ mkdir -p build && cd build
+ $ cmake ../libwebp \
+   -DWEBP_BUILD_DWEBP=1 \
+   -DCMAKE_C_COMPILER=/opt/android-arm64-24/bin/clang \
+   -DCMAKE_PREFIX_PATH=/opt/android-arm64-24/sysroot/usr/lib \
+   -DCMAKE_C_FLAGS=-fPIE \
+   -DCMAKE_EXE_LINKER_FLAGS=-Wl,-pie \
+   -DCMAKE_BUILD_TYPE=Release \
+   -DWEBP_ENABLE_WASM=1
+
+Linux:
+ $ gcc_arm=/opt/gcc-aarch64; target=aarch64-linux-gnu
+ $ mkdir -p build && cd build
+ $ cmake ../libwebp -DWEBP_BUILD_DWEBP=1 -DWEBP_ENABLE_WASM=1 \
+   -DCMAKE_C_COMPILER=clang \
+   -DCMAKE_C_FLAGS="--target=$target --gcc-toolchain=$gcc_arm --sysroot=$gcc_arm/$target/libc" \
+   -DCMAKE_PREFIX_PATH=$gcc_arm/$target/libc/usr

README.webp_js

@@ -0,0 +1,80 @@
+     __   __ ____ ____ ____     __  ____
+    /  \\/  \  _ \  _ \  _ \   (__)/  __\
+    \       /  __/ _  \  __/   _)  \_   \
+     \__\__/_____/____/_/     /____/____/
+
+Description:
+============
+
+This file describes the compilation of libwebp into a JavaScript decoder
+using Emscripten and CMake.
+
+ - install the Emscripten SDK following the procedure described at:
+   https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html
+   After installation, you should have some global variable positioned to the
+   location of the SDK. In particular, $EMSCRIPTEN should point to the
+   top-level directory containing Emscripten tools.
+
+ - make sure the file $EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake is
+   accessible. This is the toolchain file used by CMake to invoke Emscripten.
+
+ - configure the project 'WEBP_JS' with CMake using:
+
+ cd webp_js && \
+ cmake -DWEBP_BUILD_WEBP_JS=ON \
+       -DEMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES=1 \
+       -DCMAKE_TOOLCHAIN_FILE=$EMSCRIPTEN/cmake/Modules/Platform/Emscripten.cmake \
+       ../
+
+ - compile webp.js using 'make'.
+
+ - that's it! Upon completion, you should have the webp.js and
+   webp.js.mem files generated.
+
+ - Note this generates both webp_js and webp_wasm without any SIMD enabled due
+   to bugs with this toolchain associated with the SSE2 code.
+   -DWEBP_ENABLE_WASM is currently meant to generate native (x86, arm)
+   executables (dwebp, cwebp) and is incompatible with -DWEBP_BUILD_WEBP_JS.
+
+The callable JavaScript function is WebPToSDL(), which decodes a raw WebP
+bitstream into a canvas. See webp_js/index.html for a simple usage sample.
+
+Demo HTML page:
+===============
+
+   The HTML page webp_js/index.html requires an HTTP server to serve the WebP
+   image example. It's easy to just use Python for that.
+
+cd webp_js && python -m SimpleHTTPServer 8080
+
+and then navigate to http://localhost:8080 in your favorite browser.
+
+
+Web-Assembly (WASM) version:
+============================
+
+  CMakeLists.txt is configured to build the WASM version when using
+  the option WEBP_BUILD_WEBP_JS=ON. The compilation step will assemble
+  the files 'webp_wasm.js', 'webp_wasm.wasm' in the webp_js/ directory.
+  See webp_js/index_wasm.html for a simple demo page using the WASM version
+  of the library.
+
+  You will need a fairly recent version of Emscripten (at least 1.37.8) and of
+  your WASM-enabled browser to run this version. Consider it very experimental!
+
+Caveat:
+=======
+
+  - First decoding using the library is usually slower, due to just-in-time
+    compilation.
+
+  - Some versions of llvm produce the following compile error when SSE2 is
+    enabled.
+
+"Unsupported:   %516 = bitcast <8 x i16> %481 to i128
+ LLVM ERROR: BitCast Instruction not yet supported for integer types larger than 64 bits"
+
+    The corresponding Emscripten bug is at:
+    https://github.com/kripken/emscripten/issues/3788
+
+    Therefore, SSE2 optimization is currently disabled in CMakeLists.txt.

build.gradle

@@ -74,9 +74,17 @@ model {
           cCompiler.args "-frename-registers -s"
         }
       }
+      // mips32 fails to build with clang from r14b
+      // https://bugs.chromium.org/p/webp/issues/detail?id=343
+      if (toolChain in Clang) {
+        if (getTargetPlatform() == "mips") {
+          cCompiler.args "-no-integrated-as"
+        }
+      }
       // Check for NEON usage.
       if (getTargetPlatform() == "arm" || getTargetPlatform() == "arm64") {
         NEON = "c.neon"
+        cCompiler.define "HAVE_CPU_FEATURES_H"
       } else {
         NEON = "c"
       }
@@ -96,19 +104,20 @@ model {
         c {
           source {
             srcDir "src/dec"
-            include "alpha.c"
-            include "buffer.c"
-            include "frame.c"
-            include "idec.c"
-            include "io.c"
-            include "quant.c"
-            include "tree.c"
-            include "vp8.c"
-            include "vp8l.c"
-            include "webp.c"
+            include "alpha_dec.c"
+            include "buffer_dec.c"
+            include "frame_dec.c"
+            include "idec_dec.c"
+            include "io_dec.c"
+            include "quant_dec.c"
+            include "tree_dec.c"
+            include "vp8_dec.c"
+            include "vp8l_dec.c"
+            include "webp_dec.c"
             srcDir "src/dsp"
             include "alpha_processing.c"
             include "alpha_processing_mips_dsp_r2.c"
+            include "alpha_processing_neon.$NEON"
             include "alpha_processing_sse2.c"
             include "alpha_processing_sse41.c"
             include "argb.c"
@@ -125,34 +134,39 @@ model {
             include "dec_sse41.c"
             include "filters.c"
             include "filters_mips_dsp_r2.c"
+            include "filters_msa.c"
+            include "filters_neon.$NEON"
             include "filters_sse2.c"
             include "lossless.c"
             include "lossless_mips_dsp_r2.c"
+            include "lossless_msa.c"
             include "lossless_neon.$NEON"
             include "lossless_sse2.c"
             include "rescaler.c"
             include "rescaler_mips32.c"
             include "rescaler_mips_dsp_r2.c"
+            include "rescaler_msa.c"
             include "rescaler_neon.$NEON"
             include "rescaler_sse2.c"
             include "upsampling.c"
             include "upsampling_mips_dsp_r2.c"
+            include "upsampling_msa.c"
             include "upsampling_neon.$NEON"
             include "upsampling_sse2.c"
             include "yuv.c"
             include "yuv_mips32.c"
             include "yuv_mips_dsp_r2.c"
+            include "yuv_neon.$NEON"
             include "yuv_sse2.c"
             srcDir "src/utils"
-            include "ans.c"
-            include "bit_reader.c"
-            include "color_cache.c"
-            include "filters.c"
-            include "huffman.c"
-            include "quant_levels_dec.c"
-            include "random.c"
-            include "rescaler.c"
-            include "thread.c"
+            include "bit_reader_utils.c"
+            include "color_cache_utils.c"
+            include "filters_utils.c"
+            include "huffman_utils.c"
+            include "quant_levels_dec_utils.c"
+            include "random_utils.c"
+            include "rescaler_utils.c"
+            include "thread_utils.c"
             include "utils.c"
             srcDir "src/dsp"
             include "cost.c"
@@ -163,42 +177,48 @@ model {
             include "enc_avx2.c"
             include "enc_mips32.c"
             include "enc_mips_dsp_r2.c"
+            include "enc_msa.c"
             include "enc_neon.$NEON"
             include "enc_sse2.c"
             include "enc_sse41.c"
             include "lossless_enc.c"
             include "lossless_enc_mips32.c"
             include "lossless_enc_mips_dsp_r2.c"
+            include "lossless_enc_msa.c"
             include "lossless_enc_neon.$NEON"
             include "lossless_enc_sse2.c"
             include "lossless_enc_sse41.c"
+            include "ssim.c"
+            include "ssim_sse2.c"
             srcDir "src/enc"
-            include "alpha.c"
-            include "analysis.c"
-            include "backward_references.c"
-            include "config.c"
-            include "cost.c"
-            include "delta_palettization.c"
-            include "filter.c"
-            include "frame.c"
-            include "histogram.c"
-            include "iterator.c"
-            include "near_lossless.c"
-            include "picture.c"
-            include "picture_csp.c"
-            include "picture_psnr.c"
-            include "picture_rescale.c"
-            include "picture_tools.c"
-            include "quant.c"
-            include "syntax.c"
-            include "token.c"
-            include "tree.c"
-            include "vp8l.c"
-            include "webpenc.c"
+            include "alpha_enc.c"
+            include "analysis_enc.c"
+            include "backward_references_cost_enc.c"
+            include "backward_references_enc.c"
+            include "config_enc.c"
+            include "cost_enc.c"
+            include "delta_palettization_enc.c"
+            include "filter_enc.c"
+            include "frame_enc.c"
+            include "histogram_enc.c"
+            include "iterator_enc.c"
+            include "near_lossless_enc.c"
+            include "picture_enc.c"
+            include "picture_csp_enc.c"
+            include "picture_psnr_enc.c"
+            include "picture_rescale_enc.c"
+            include "picture_tools_enc.c"
+            include "predictor_enc.c"
+            include "quant_enc.c"
+            include "syntax_enc.c"
+            include "token_enc.c"
+            include "tree_enc.c"
+            include "vp8l_enc.c"
+            include "webp_enc.c"
             srcDir "src/utils"
-            include "bit_writer.c"
-            include "huffman_encode.c"
-            include "quant_levels.c"
+            include "bit_writer_utils.c"
+            include "huffman_encode_utils.c"
+            include "quant_levels_utils.c"
           }
           exportedHeaders {
             srcDir "src"
@@ -250,7 +270,7 @@ model {
       }
     }
 
-    example_dec(NativeLibrarySpec) {
+    imageio_util(NativeLibrarySpec) {
       binaries {
         all {
           lib library: "webp", linkage: "static"
@@ -259,22 +279,58 @@ model {
       sources {
         c {
           source {
-            srcDir "./examples"
+            srcDir "./imageio"
+            include "imageio_util.c"
+          }
+        }
+      }
+    }
+
+    imagedec(NativeLibrarySpec) {
+      binaries {
+        all {
+          lib library: "webp", linkage: "static"
+        }
+      }
+      sources {
+        c {
+          source {
+            srcDir "./imageio"
             include "image_dec.c"
             include "jpegdec.c"
             include "metadata.c"
             include "pngdec.c"
+            include "pnmdec.c"
             include "tiffdec.c"
             include "webpdec.c"
           }
         }
       }
     }
+
+    imageenc(NativeLibrarySpec) {
+      binaries {
+        all {
+          lib library: "webp", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
+        }
+      }
+      sources {
+        c {
+          source {
+            srcDir "./imageio"
+            include "image_enc.c"
+          }
+        }
+      }
+    }
+
     cwebp(NativeExecutableSpec) {
       binaries {
         all {
           lib library: "example_util", linkage: "static"
-          lib library: "example_dec", linkage: "static"
+          lib library: "imagedec", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
           lib library: "webp", linkage: "static"
         }
       }
@@ -292,6 +348,9 @@ model {
       binaries {
         all {
           lib library: "example_util", linkage: "static"
+          lib library: "imagedec", linkage: "static"
+          lib library: "imageenc", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
           lib library: "webp"
         }
       }
@@ -309,6 +368,7 @@ model {
       binaries {
         all {
           lib library: "example_util", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
           lib library: "webpmux", linkage: "static"
           lib library: "webp"
         }
@@ -322,6 +382,44 @@ model {
         }
       }
     }
+
+    img2webp_example(NativeExecutableSpec) {
+      binaries {
+        all {
+          lib library: "example_util", linkage: "static"
+          lib library: "imagedec", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
+          lib library: "webpmux", linkage: "static"
+          lib library: "webp"
+        }
+      }
+      sources {
+        c {
+          source {
+            srcDir "./examples"
+            include "img2webp.c"
+          }
+        }
+      }
+    }
+
+    webpinfo_example(NativeExecutableSpec) {
+      binaries {
+        all {
+          lib library: "example_util", linkage: "static"
+          lib library: "imageio_util", linkage: "static"
+          lib library: "webp"
+        }
+      }
+      sources {
+        c {
+          source {
+            srcDir "./examples"
+            include "webpinfo.c"
+          }
+        }
+      }
+    }
   }
   tasks {
     // Task to test all possible configurations.

cmake/WebPConfig.cmake.in

@@ -0,0 +1,6 @@
+@PACKAGE_INIT@
+
+set(WebP_INCLUDE_DIRS "webp")
+set(WEBP_INCLUDE_DIRS ${WebP_INCLUDE_DIRS})
+set(WebP_LIBRARIES "@INSTALLED_LIBRARIES@")
+set(WEBP_LIBRARIES "${WebP_LIBRARIES}")

cmake/config.h.cmake

@@ -65,7 +65,7 @@ endif()
 # Find the standard image libraries.
 set(WEBP_DEP_IMG_LIBRARIES)
 set(WEBP_DEP_IMG_INCLUDE_DIRS)
-foreach(I_LIB PNG JPEG TIFF GIF)
+foreach(I_LIB PNG JPEG TIFF)
   find_package(${I_LIB})
   set(WEBP_HAVE_${I_LIB} ${${I_LIB}_FOUND})
   if(${I_LIB}_FOUND)
@@ -74,6 +74,16 @@ foreach(I_LIB PNG JPEG TIFF GIF)
   endif()
 endforeach()
 
+# GIF detection, gifdec isn't part of the imageio lib.
+set(WEBP_DEP_GIF_LIBRARIES)
+set(WEBP_DEP_GIF_INCLUDE_DIRS)
+find_package(GIF)
+set(WEBP_HAVE_GIF ${GIF_FOUND})
+if(GIF_FOUND)
+  list(APPEND WEBP_DEP_GIF_LIBRARIES ${GIF_LIBRARIES})
+  list(APPEND WEBP_DEP_GIF_INCLUDE_DIRS ${GIF_INCLUDE_DIR})
+endif()
+
 ## Check for specific headers.
 include(CheckIncludeFiles)
 check_include_files("stdlib.h;stdarg.h;string.h;float.h" STDC_HEADERS)

cmake/config.h.in

@@ -103,9 +103,6 @@
 /* Enable experimental code */
 #cmakedefine WEBP_EXPERIMENTAL_FEATURES 1
 
-/* Define to 1 to force aligned memory operations */
-#cmakedefine WEBP_FORCE_ALIGNED 1
-
 /* Set to 1 if AVX2 is supported */
 #cmakedefine WEBP_HAVE_AVX2 1
 

cmake/cpu.cmake

@@ -1,6 +1,11 @@
 ## Check for SIMD extensions.
 
-function(webp_check_compiler_flag WEBP_SIMD_FLAG)
+function(webp_check_compiler_flag WEBP_SIMD_FLAG ENABLE_SIMD)
+  if(NOT ENABLE_SIMD)
+    message(STATUS "Disabling ${WEBP_SIMD_FLAG} optimization.")
+    set(WEBP_HAVE_${WEBP_SIMD_FLAG} 0 PARENT_SCOPE)
+    return()
+  endif()
   unset(WEBP_HAVE_FLAG_${WEBP_SIMD_FLAG} CACHE)
   check_c_source_compiles("
       #include \"${CMAKE_CURRENT_LIST_DIR}/../src/dsp/dsp.h\"
@@ -56,11 +61,11 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
   # (especially on Android).
   unset(WEBP_HAVE_${WEBP_SIMD_FLAG} CACHE)
   set(CMAKE_REQUIRED_FLAGS)
-  webp_check_compiler_flag(${WEBP_SIMD_FLAG})
+  webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
   if(NOT WEBP_HAVE_${WEBP_SIMD_FLAG})
     list(GET SIMD_ENABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
     set(CMAKE_REQUIRED_FLAGS ${SIMD_COMPILE_FLAG})
-    webp_check_compiler_flag(${WEBP_SIMD_FLAG})
+    webp_check_compiler_flag(${WEBP_SIMD_FLAG} ${WEBP_ENABLE_SIMD})
   else()
     set(SIMD_COMPILE_FLAG " ")
   endif()
@@ -80,13 +85,33 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
     foreach(FILE ${SIMD_FILES})
       list(APPEND WEBP_SIMD_FILES_NOT_TO_INCLUDE ${FILE})
     endforeach()
-    # Explicitly disable SIMD.
-    if(SIMD_DISABLE_FLAGS)
+    # Explicitly disable SIMD. Avoid this with WASM to avoid an ICE with clang:
+    # https://bugs.chromium.org/p/webp/issues/detail?id=350
+    # WASM overrides the native SIMD so building it in is harmless aside from
+    # binary size.
+    if(NOT WEBP_ENABLE_WASM AND SIMD_DISABLE_FLAGS)
       list(GET SIMD_DISABLE_FLAGS ${I_SIMD} SIMD_COMPILE_FLAG)
       include(CheckCCompilerFlag)
       if(SIMD_COMPILE_FLAG)
         unset(HAS_COMPILE_FLAG CACHE)
         check_c_compiler_flag(${SIMD_COMPILE_FLAG} HAS_COMPILE_FLAG)
+        if(HAS_COMPILE_FLAG)
+          # Do one more check for Clang to circumvent CMake issue 13194.
+          if(COMMAND check_compiler_flag_common_patterns)
+            # Only in CMake 3.0 and above.
+            check_compiler_flag_common_patterns(COMMON_PATTERNS)
+          else()
+            set(COMMON_PATTERNS)
+          endif()
+          set(CMAKE_REQUIRED_DEFINITIONS ${SIMD_COMPILE_FLAG})
+          check_c_source_compiles("int main(void) {return 0;}" FLAG2
+            FAIL_REGEX "warning: argument unused during compilation:"
+            ${COMMON_PATTERNS}
+          )
+          if(NOT FLAG2)
+            unset(HAS_COMPILE_FLAG CACHE)
+          endif()
+        endif()
         if(HAS_COMPILE_FLAG)
           set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${SIMD_COMPILE_FLAG}")
         endif()
@@ -94,3 +119,13 @@ foreach(I_SIMD RANGE ${WEBP_SIMD_FLAGS_RANGE})
     endif()
   endif()
 endforeach()
+
+## Add *_wasm.c files if enabled.
+if(WEBP_ENABLE_WASM)
+  file(GLOB SIMD_FILES "${CMAKE_CURRENT_LIST_DIR}/../"
+    "src/dsp/*_wasm.c"
+  )
+  foreach(FILE ${SIMD_FILES})
+    list(APPEND WEBP_SIMD_FILES_TO_INCLUDE ${FILE})
+  endforeach()
+endif()

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([libwebp], [0.5.2],
+AC_INIT([libwebp], [0.6.0],
         [https://bugs.chromium.org/p/webp],,
         [http://developers.google.com/speed/webp])
 AC_CANONICAL_HOST
@@ -67,6 +67,7 @@ AC_DEFUN([TEST_AND_ADD_CFLAGS],
           CFLAGS="$SAVED_CFLAGS"])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-fvisibility=hidden])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wall])
+TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wconstant-conversion])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wdeclaration-after-statement])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wextra])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wfloat-conversion])
@@ -75,6 +76,7 @@ TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wformat -Wformat-security])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wmissing-declarations])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wmissing-prototypes])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wold-style-definition])
+TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wparentheses-equality])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wshadow])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wshorten-64-to-32])
 TEST_AND_ADD_CFLAGS([AM_CFLAGS], [-Wunreachable-code])
@@ -241,9 +243,13 @@ AS_IF([test "x$enable_neon" != "xno"], [
           NEON_FLAGS=""],
           [AC_DEFINE(WEBP_HAVE_NEON_RTCD, [1],
                      [Set to 1 if runtime detection of NEON is enabled])])])
-        ;;
-    esac
-    AC_SUBST([NEON_FLAGS])])
+
+      case "$host_os" in
+        *android*) AC_CHECK_HEADERS([cpu-features.h]) ;;
+      esac
+      ;;
+  esac
+  AC_SUBST([NEON_FLAGS])])
 
 dnl === CLEAR_LIBVARS([var_pfx])
 dnl ===   Clears <var_pfx>_{INCLUDES,LIBS}.
@@ -428,6 +434,44 @@ AS_IF([test "x$enable_gl" != "xno"], [
 ])
 AM_CONDITIONAL([BUILD_VWEBP], [test "$build_vwebp" = "yes"])
 
+dnl === check for SDL support ===
+
+AC_ARG_ENABLE([sdl],
+              AS_HELP_STRING([--disable-sdl],
+                             [Disable detection of SDL support
+                              @<:@default=auto@:>@]))
+AS_IF([test "x$enable_sdl" != "xno"], [
+  CLEAR_LIBVARS([SDL])
+  WITHLIB_OPTION([sdl], [SDL])
+
+  $sdl_header = "no";
+  LIBCHECK_PROLOGUE([SDL])
+  AC_CHECK_HEADER([SDL/SDL.h], [sdl_header="SDL_SDL.h"],
+                  [AC_CHECK_HEADER([SDL.h], [sdl_header="SDL.h"],
+                  [AC_MSG_WARN(SDL library not available - no sdl.h)])])
+  if test x"$sdl_header" != "xno" ; then
+    AC_CHECK_LIB(SDL, SDL_Init,
+                 [SDL_LIBS="-lSDL"
+                  SDL_INCLUDES="-DWEBP_HAVE_SDL"
+                  AC_DEFINE(WEBP_HAVE_SDL, [1],
+                            [Set to 1 if SDL library is installed])
+                  sdl_support=yes
+                 ],
+                 AC_MSG_WARN(Optional SDL library not found),
+                 [$MATH_LIBS]),
+    if test x"$sdl_header" == "xSDL.h" ; then
+      SDL_INCLUDES="$SDL_INCLUDES -DWEBP_HAVE_JUST_SDL_H"
+    fi
+  fi
+  LIBCHECK_EPILOGUE([SDL])
+
+  if test "$sdl_support" = "yes" ; then
+    build_vwebp_sdl=yes
+  fi
+])
+
+AM_CONDITIONAL([BUILD_VWEBP_SDL], [test "$build_vwebp_sdl" = "yes"])
+
 dnl === check for PNG support ===
 
 AC_ARG_ENABLE([png], AS_HELP_STRING([--disable-png],
@@ -556,6 +600,16 @@ AS_IF([test "x$enable_gif" != "xno"], [
 AM_CONDITIONAL([BUILD_ANIMDIFF], [test "${build_animdiff}" = "yes"])
 AM_CONDITIONAL([BUILD_GIF2WEBP], [test "${build_gif2webp}" = "yes"])
 
+if test "$enable_libwebpmux" = "yes"; then
+  build_img2webp=yes
+fi
+AM_CONDITIONAL([BUILD_IMG2WEBP], [test "${build_img2webp}" = "yes"])
+
+if test "$enable_libwebpmux" = "yes"; then
+  build_webpinfo=yes
+fi
+AM_CONDITIONAL([BUILD_WEBPINFO], [test "${build_webpinfo}" = "yes"])
+
 dnl === check for WIC support ===
 
 AC_ARG_ENABLE([wic],
@@ -608,19 +662,6 @@ if test "$enable_wic" = "yes"; then
 fi
 esac
 
-dnl === If --enable-aligned is defined, define WEBP_FORCE_ALIGNED
-
-AC_MSG_CHECKING(if --enable-aligned option is specified)
-AC_ARG_ENABLE([aligned],
-              AS_HELP_STRING([--enable-aligned],
-                             [Force aligned memory operations in non-dsp code
-                              (may be slower)]))
-if test "$enable_aligned" = "yes"; then
-  AC_DEFINE(WEBP_FORCE_ALIGNED, [1],
-            [Define to 1 to force aligned memory operations])
-fi
-AC_MSG_RESULT(${enable_aligned-no})
-
 dnl === If --enable-swap-16bit-csp is defined, add -DWEBP_SWAP_16BIT_CSP
 
 USE_SWAP_16BIT_CSP=""
@@ -684,13 +725,12 @@ dnl =========================
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([src/webp/config.h])
 AC_CONFIG_FILES([Makefile src/Makefile man/Makefile \
-                 examples/Makefile src/dec/Makefile \
-                 src/enc/Makefile src/dsp/Makefile \
+                 examples/Makefile extras/Makefile imageio/Makefile \
+                 src/dec/Makefile src/enc/Makefile src/dsp/Makefile \
                  src/demux/Makefile src/mux/Makefile \
-                 src/utils/Makefile src/extras/Makefile \
+                 src/utils/Makefile \
                  src/libwebp.pc src/libwebpdecoder.pc \
-                 src/demux/libwebpdemux.pc src/mux/libwebpmux.pc \
-                 src/extras/libwebpextras.pc])
+                 src/demux/libwebpdemux.pc src/mux/libwebpmux.pc])
 
 
 AC_OUTPUT
@@ -724,6 +764,10 @@ dwebp : yes
 GIF support : ${gif_support-no}
 anim_diff   : ${build_animdiff-no}
 gif2webp    : ${build_gif2webp-no}
+img2webp    : ${build_img2webp-no}
 webpmux     : ${enable_libwebpmux-no}
 vwebp       : ${build_vwebp-no}
+webpinfo    : ${build_webpinfo-no}
+SDL support : ${sdl_support-no}
+vwebp_sdl   : ${build_vwebp_sdl-no}
 ])

examples/Android.mk

@@ -15,27 +15,6 @@ LOCAL_MODULE := example_util
 
 include $(BUILD_STATIC_LIBRARY)
 
-
-################################################################################
-# libexample_dec
-
-include $(CLEAR_VARS)
-
-LOCAL_SRC_FILES := \
-    image_dec.c \
-    jpegdec.c \
-    metadata.c \
-    pngdec.c \
-    tiffdec.c \
-    webpdec.c \
-
-LOCAL_CFLAGS := $(WEBP_CFLAGS)
-LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
-
-LOCAL_MODULE := example_dec
-
-include $(BUILD_STATIC_LIBRARY)
-
 ################################################################################
 # cwebp
 
@@ -48,7 +27,7 @@ LOCAL_SRC_FILES := \
 
 LOCAL_CFLAGS := $(WEBP_CFLAGS)
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
-LOCAL_STATIC_LIBRARIES := example_util example_dec webp
+LOCAL_STATIC_LIBRARIES := example_util imageio_util imagedec webp
 
 LOCAL_MODULE := cwebp
 
@@ -64,7 +43,7 @@ LOCAL_SRC_FILES := \
 
 LOCAL_CFLAGS := $(WEBP_CFLAGS)
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
-LOCAL_STATIC_LIBRARIES := example_util webp
+LOCAL_STATIC_LIBRARIES := example_util imagedec imageenc webp
 
 LOCAL_MODULE := dwebp
 
@@ -80,8 +59,40 @@ LOCAL_SRC_FILES := \
 
 LOCAL_CFLAGS := $(WEBP_CFLAGS)
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
-LOCAL_STATIC_LIBRARIES := example_util webpmux webp
+LOCAL_STATIC_LIBRARIES := example_util imageio_util webpmux webp
 
 LOCAL_MODULE := webpmux_example
 
 include $(BUILD_EXECUTABLE)
+
+################################################################################
+# img2webp
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    img2webp.c \
+
+LOCAL_CFLAGS := $(WEBP_CFLAGS)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
+LOCAL_STATIC_LIBRARIES := example_util imageio_util imagedec webpmux webp
+
+LOCAL_MODULE := img2webp_example
+
+include $(BUILD_EXECUTABLE)
+
+################################################################################
+# webpinfo
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    webpinfo.c \
+
+LOCAL_CFLAGS := $(WEBP_CFLAGS)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
+LOCAL_STATIC_LIBRARIES := example_util imageio_util webp
+
+LOCAL_MODULE := webpinfo_example
+
+include $(BUILD_EXECUTABLE)

examples/Makefile.am

@@ -1,70 +1,83 @@
 AM_CPPFLAGS += -I$(top_builddir)/src -I$(top_srcdir)/src
 
 bin_PROGRAMS = dwebp cwebp
-if BUILD_VWEBP
-  bin_PROGRAMS += vwebp
+if BUILD_ANIMDIFF
+  noinst_PROGRAMS = anim_diff
+endif
+if BUILD_GIF2WEBP
+  bin_PROGRAMS += gif2webp
+endif
+if BUILD_IMG2WEBP
+  bin_PROGRAMS += img2webp
 endif
 if WANT_MUX
   bin_PROGRAMS += webpmux
 endif
-
-if BUILD_GIF2WEBP
-  bin_PROGRAMS += gif2webp
+if BUILD_VWEBP
+  bin_PROGRAMS += vwebp
+endif
+if BUILD_WEBPINFO
+  bin_PROGRAMS += webpinfo
 endif
 
-noinst_LTLIBRARIES = libexampleutil.la libexampledec.la
+noinst_LTLIBRARIES = libexample_util.la
 
-libexampleutil_la_SOURCES = example_util.c example_util.h stopwatch.h
-
-libexampledec_la_SOURCES  = image_dec.c image_dec.h
-libexampledec_la_SOURCES += jpegdec.c jpegdec.h
-libexampledec_la_SOURCES += metadata.c metadata.h
-libexampledec_la_SOURCES += pngdec.c pngdec.h
-libexampledec_la_SOURCES += tiffdec.c tiffdec.h
-libexampledec_la_SOURCES += webpdec.c webpdec.h
-libexampledec_la_SOURCES += wicdec.c wicdec.h
-libexampledec_la_CPPFLAGS = $(JPEG_INCLUDES) $(PNG_INCLUDES) $(TIFF_INCLUDES)
-libexampledec_la_CPPFLAGS += $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
-
-if BUILD_ANIMDIFF
-  noinst_PROGRAMS = anim_diff
-endif
+libexample_util_la_SOURCES = example_util.c example_util.h
+libexample_util_la_LIBADD = ../src/libwebp.la
 
 anim_diff_SOURCES = anim_diff.c anim_util.c anim_util.h
 anim_diff_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE) $(GIF_INCLUDES)
 anim_diff_LDADD  = ../src/demux/libwebpdemux.la
-anim_diff_LDADD += libexampleutil.la
+anim_diff_LDADD += libexample_util.la ../imageio/libimageio_util.la
 anim_diff_LDADD += $(GIF_LIBS) -lm
 
+cwebp_SOURCES  = cwebp.c stopwatch.h
+cwebp_CPPFLAGS  = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+cwebp_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+cwebp_LDADD += ../imageio/libimagedec.la ../src/libwebp.la
+cwebp_LDADD += $(JPEG_LIBS) $(PNG_LIBS) $(TIFF_LIBS)
+
 dwebp_SOURCES = dwebp.c stopwatch.h
 dwebp_CPPFLAGS  = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
 dwebp_CPPFLAGS += $(JPEG_INCLUDES) $(PNG_INCLUDES)
-dwebp_LDADD = libexampleutil.la $(PNG_LIBS) $(JPEG_LIBS)
-
-cwebp_SOURCES  = cwebp.c stopwatch.h
-cwebp_CPPFLAGS  = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
-cwebp_LDADD  = libexampleutil.la libexampledec.la ../src/libwebp.la
-cwebp_LDADD += $(JPEG_LIBS) $(PNG_LIBS) $(TIFF_LIBS)
+dwebp_LDADD  = libexample_util.la
+dwebp_LDADD += ../imageio/libimagedec.la
+dwebp_LDADD += ../imageio/libimageenc.la
+dwebp_LDADD += ../imageio/libimageio_util.la
+dwebp_LDADD += ../src/libwebp.la
+dwebp_LDADD +=$(PNG_LIBS) $(JPEG_LIBS)
 
 gif2webp_SOURCES = gif2webp.c gifdec.c gifdec.h
 gif2webp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE) $(GIF_INCLUDES)
-gif2webp_LDADD  = libexampleutil.la ../src/mux/libwebpmux.la ../src/libwebp.la
-gif2webp_LDADD += $(GIF_LIBS)
-
-webpmux_SOURCES = webpmux.c
-webpmux_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
-webpmux_LDADD = libexampleutil.la ../src/mux/libwebpmux.la ../src/libwebp.la
+gif2webp_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+gif2webp_LDADD += ../src/mux/libwebpmux.la ../src/libwebp.la $(GIF_LIBS)
 
 vwebp_SOURCES = vwebp.c
 vwebp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE) $(GL_INCLUDES)
-vwebp_LDADD = libexampleutil.la ../src/demux/libwebpdemux.la $(GL_LIBS)
+vwebp_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+vwebp_LDADD += ../src/demux/libwebpdemux.la $(GL_LIBS)
+
+webpmux_SOURCES = webpmux.c
+webpmux_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+webpmux_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+webpmux_LDADD += ../src/mux/libwebpmux.la ../src/libwebp.la
+
+img2webp_SOURCES = img2webp.c
+img2webp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+img2webp_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+img2webp_LDADD += ../imageio/libimagedec.la
+img2webp_LDADD += ../src/mux/libwebpmux.la ../src/libwebp.la
+img2webp_LDADD += $(PNG_LIBS) $(JPEG_LIBS) $(TIFF_LIBS)
+
+webpinfo_SOURCES = webpinfo.c
+webpinfo_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+webpinfo_LDADD  = libexample_util.la ../imageio/libimageio_util.la
+webpinfo_LDADD += ../src/libwebp.la
 
 if BUILD_LIBWEBPDECODER
   anim_diff_LDADD += ../src/libwebpdecoder.la
-  dwebp_LDADD += ../src/libwebpdecoder.la
   vwebp_LDADD += ../src/libwebpdecoder.la
 else
   anim_diff_LDADD += ../src/libwebp.la
-  dwebp_LDADD += ../src/libwebp.la
   vwebp_LDADD += ../src/libwebp.la
 endif

examples/anim_util.c

@@ -22,7 +22,7 @@
 #include "webp/format_constants.h"
 #include "webp/decode.h"
 #include "webp/demux.h"
-#include "./example_util.h"
+#include "../imageio/imageio_util.h"
 
 #if defined(_MSC_VER) && _MSC_VER < 1900
 #define snprintf _snprintf
@@ -150,6 +150,7 @@ static int DumpFrame(const char filename[], const char dump_folder[],
   const char* base_name = NULL;
   char* file_name = NULL;
   FILE* f = NULL;
+  const char* row;
 
   base_name = strrchr(filename, '/');
   base_name = (base_name == NULL) ? filename : base_name + 1;
@@ -176,12 +177,13 @@ static int DumpFrame(const char filename[], const char dump_folder[],
     fprintf(stderr, "Write error for file %s\n", file_name);
     goto End;
   }
+  row = (const char*)rgba;
   for (y = 0; y < canvas_height; ++y) {
-    if (fwrite((const char*)(rgba) + y * canvas_width * kNumChannels,
-               canvas_width * kNumChannels, 1, f) != 1) {
+    if (fwrite(row, canvas_width * kNumChannels, 1, f) != 1) {
       fprintf(stderr, "Error writing to file: %s\n", file_name);
       goto End;
     }
+    row += canvas_width * kNumChannels;
   }
   ok = 1;
  End:
@@ -704,7 +706,7 @@ int ReadAnimatedImage(const char filename[], AnimatedImage* const image,
   WebPDataInit(&webp_data);
   memset(image, 0, sizeof(*image));
 
-  if (!ExUtilReadFile(filename, &webp_data.bytes, &webp_data.size)) {
+  if (!ImgIoUtilReadFile(filename, &webp_data.bytes, &webp_data.size)) {
     fprintf(stderr, "Error reading file: %s\n", filename);
     return 0;
   }
@@ -743,7 +745,7 @@ void GetDiffAndPSNR(const uint8_t rgba1[], const uint8_t rgba2[],
   for (y = 0; y < height; ++y) {
     for (x = 0; x < stride; x += kNumChannels) {
       int k;
-      const size_t offset = y * stride + x;
+      const size_t offset = (size_t)y * stride + x;
       const int alpha1 = rgba1[offset + kAlphaChannel];
       const int alpha2 = rgba2[offset + kAlphaChannel];
       Accumulate(alpha1, alpha2, &f_max_diff, &sse);

examples/cwebp.c

@@ -20,8 +20,9 @@
 #include "webp/config.h"
 #endif
 
-#include "./example_util.h"
-#include "./image_dec.h"
+#include "../examples/example_util.h"
+#include "../imageio/image_dec.h"
+#include "../imageio/imageio_util.h"
 #include "./stopwatch.h"
 #include "webp/encode.h"
 
@@ -59,12 +60,12 @@ static int ReadYUV(const uint8_t* const data, size_t data_size,
 
   pic->use_argb = 0;
   if (!WebPPictureAlloc(pic)) return 0;
-  ExUtilCopyPlane(data, pic->width, pic->y, pic->y_stride,
-                  pic->width, pic->height);
-  ExUtilCopyPlane(data + y_plane_size, uv_width,
-                  pic->u, pic->uv_stride, uv_width, uv_height);
-  ExUtilCopyPlane(data + y_plane_size + uv_plane_size, uv_width,
-                  pic->v, pic->uv_stride, uv_width, uv_height);
+  ImgIoUtilCopyPlane(data, pic->width, pic->y, pic->y_stride,
+                     pic->width, pic->height);
+  ImgIoUtilCopyPlane(data + y_plane_size, uv_width,
+                     pic->u, pic->uv_stride, uv_width, uv_height);
+  ImgIoUtilCopyPlane(data + y_plane_size + uv_plane_size, uv_width,
+                     pic->v, pic->uv_stride, uv_width, uv_height);
   return use_argb ? WebPPictureYUVAToARGB(pic) : 1;
 }
 
@@ -76,13 +77,13 @@ static int ReadPicture(const char* const filename, WebPPicture* const pic,
   const uint8_t* data = NULL;
   size_t data_size = 0;
   if (pic->width != 0 && pic->height != 0) {
-    ok = ExUtilReadFile(filename, &data, &data_size);
+    ok = ImgIoUtilReadFile(filename, &data, &data_size);
     ok = ok && ReadYUV(data, data_size, pic);
   } else {
     // If no size specified, try to decode it using WIC.
     ok = ReadPictureWithWIC(filename, pic, keep_alpha, metadata);
     if (!ok) {
-      ok = ExUtilReadFile(filename, &data, &data_size);
+      ok = ImgIoUtilReadFile(filename, &data, &data_size);
       ok = ok && ReadWebP(data, data_size, pic, keep_alpha, metadata);
     }
   }
@@ -101,12 +102,12 @@ static int ReadPicture(const char* const filename, WebPPicture* const pic,
   size_t data_size = 0;
   int ok = 0;
 
-  ok = ExUtilReadFile(filename, &data, &data_size);
+  ok = ImgIoUtilReadFile(filename, &data, &data_size);
   if (!ok) goto End;
 
   if (pic->width == 0 || pic->height == 0) {
     WebPImageReader reader = WebPGuessImageReader(data, data_size);
-    ok = (reader != NULL) && reader(data, data_size, pic, keep_alpha, metadata);
+    ok = reader(data, data_size, pic, keep_alpha, metadata);
   } else {
     // If image size is specified, infer it as YUV format.
     ok = ReadYUV(data, data_size, pic);
@@ -296,6 +297,10 @@ static int DumpPicture(const WebPPicture* const picture, const char* PGM_name) {
   const int uv_width = (picture->width + 1) / 2;
   const int uv_height = (picture->height + 1) / 2;
   const int stride = (picture->width + 1) & ~1;
+  const uint8_t* src_y = picture->y;
+  const uint8_t* src_u = picture->u;
+  const uint8_t* src_v = picture->v;
+  const uint8_t* src_a = picture->a;
   const int alpha_height =
       WebPPictureHasTransparency(picture) ? picture->height : 0;
   const int height = picture->height + uv_height + alpha_height;
@@ -303,20 +308,20 @@ static int DumpPicture(const WebPPicture* const picture, const char* PGM_name) {
   if (f == NULL) return 0;
   fprintf(f, "P5\n%d %d\n255\n", stride, height);
   for (y = 0; y < picture->height; ++y) {
-    if (fwrite(picture->y + y * picture->y_stride, picture->width, 1, f) != 1)
-      return 0;
+    if (fwrite(src_y, picture->width, 1, f) != 1) return 0;
     if (picture->width & 1) fputc(0, f);  // pad
+    src_y += picture->y_stride;
   }
   for (y = 0; y < uv_height; ++y) {
-    if (fwrite(picture->u + y * picture->uv_stride, uv_width, 1, f) != 1)
-      return 0;
-    if (fwrite(picture->v + y * picture->uv_stride, uv_width, 1, f) != 1)
-      return 0;
+    if (fwrite(src_u, uv_width, 1, f) != 1) return 0;
+    if (fwrite(src_v, uv_width, 1, f) != 1) return 0;
+    src_u += picture->uv_stride;
+    src_v += picture->uv_stride;
   }
   for (y = 0; y < alpha_height; ++y) {
-    if (fwrite(picture->a + y * picture->a_stride, picture->width, 1, f) != 1)
-      return 0;
+    if (fwrite(src_a, picture->width, 1, f) != 1) return 0;
     if (picture->width & 1) fputc(0, f);  // pad
+    src_a += picture->a_stride;
   }
   fclose(f);
   return 1;
@@ -544,6 +549,8 @@ static void HelpLong(void) {
   printf("  -strong ................ use strong filter instead "
                                      "of simple (default)\n");
   printf("  -nostrong .............. use simple filter instead of strong\n");
+  printf("  -sharp_yuv ............. use sharper (and slower) RGB->YUV "
+                                     "conversion\n");
   printf("  -partition_limit <int> . limit quality to fit the 512k limit on\n");
   printf("                           "
          "the first partition (0=no degradation ... 100=full)\n");
@@ -572,8 +579,8 @@ static void HelpLong(void) {
   printf("  -near_lossless <int> ... use near-lossless image\n"
          "                           preprocessing (0..100=off), "
          "default=100\n");
-#ifdef WEBP_EXPERIMENTAL_FEATURES
-  printf("  -delta_palettization ... use delta palettization\n");
+#ifdef WEBP_EXPERIMENTAL_FEATURES  /* not documented yet */
+  printf("  -delta_palette ......... use delta palettization\n");
 #endif  // WEBP_EXPERIMENTAL_FEATURES
   printf("  -hint <string> ......... specify image characteristics hint,\n");
   printf("                           one of: photo, picture or graph\n");
@@ -744,9 +751,9 @@ int main(int argc, const char *argv[]) {
       config.near_lossless = ExUtilGetInt(argv[++c], 0, &parse_error);
       config.lossless = 1;  // use near-lossless only with lossless
 #ifdef WEBP_EXPERIMENTAL_FEATURES
-    } else if (!strcmp(argv[c], "-delta_palettization")) {
-      config.delta_palettization = 1;
-      config.lossless = 1;  // use delta-palettization only with lossless
+    } else if (!strcmp(argv[c], "-delta_palette")) {
+      config.use_delta_palette = 1;
+      config.lossless = 1;  // delta-palette is for lossless only
 #endif  // WEBP_EXPERIMENTAL_FEATURES
     } else if (!strcmp(argv[c], "-hint") && c < argc - 1) {
       ++c;
@@ -782,6 +789,8 @@ int main(int argc, const char *argv[]) {
       config.filter_type = 0;
     } else if (!strcmp(argv[c], "-sharpness") && c < argc - 1) {
       config.filter_sharpness = ExUtilGetInt(argv[++c], 0, &parse_error);
+    } else if (!strcmp(argv[c], "-sharp_yuv")) {
+      config.use_sharp_yuv = 1;
     } else if (!strcmp(argv[c], "-pass") && c < argc - 1) {
       config.pass = ExUtilGetInt(argv[++c], 0, &parse_error);
     } else if (!strcmp(argv[c], "-pre") && c < argc - 1) {
@@ -940,7 +949,8 @@ int main(int argc, const char *argv[]) {
   // Read the input. We need to decide if we prefer ARGB or YUVA
   // samples, depending on the expected compression mode (this saves
   // some conversion steps).
-  picture.use_argb = (config.lossless || config.preprocessing > 0 ||
+  picture.use_argb = (config.lossless || config.use_sharp_yuv ||
+                      config.preprocessing > 0 ||
                       crop || (resize_w | resize_h) > 0);
   if (verbose) {
     StopwatchReset(&stop_watch);
@@ -964,7 +974,7 @@ int main(int argc, const char *argv[]) {
   // Open the output
   if (out_file != NULL) {
     const int use_stdout = !strcmp(out_file, "-");
-    out = use_stdout ? ExUtilSetBinaryMode(stdout) : fopen(out_file, "wb");
+    out = use_stdout ? ImgIoUtilSetBinaryMode(stdout) : fopen(out_file, "wb");
     if (out == NULL) {
       fprintf(stderr, "Error! Cannot open output file '%s'\n", out_file);
       goto Error;
@@ -1088,20 +1098,6 @@ int main(int argc, const char *argv[]) {
     if (print_distortion >= 0) {    // print distortion
       static const char* distortion_names[] = { "PSNR", "SSIM", "LSIM" };
       float values[5];
-      if (picture.use_argb != original_picture.use_argb) {
-        // Somehow, the WebPEncode() call converted the original picture.
-        // We need to make both match before calling WebPPictureDistortion().
-        int ok = 0;
-        if (picture.use_argb) {
-          ok = WebPPictureYUVAToARGB(&original_picture);
-        } else {
-          ok = WebPPictureARGBToYUVA(&original_picture, WEBP_YUV420A);
-        }
-        if (!ok) {
-          fprintf(stderr, "Error while converting original picture.\n");
-          goto Error;
-        }
-      }
       if (!WebPPictureDistortion(&picture, &original_picture,
                                  print_distortion, values)) {
         fprintf(stderr, "Error while computing the distortion.\n");
@@ -1109,13 +1105,8 @@ int main(int argc, const char *argv[]) {
       }
       if (!short_output) {
         fprintf(stderr, "%s: ", distortion_names[print_distortion]);
-        if (picture.use_argb) {
-          fprintf(stderr, "B:%.2f G:%.2f R:%.2f A:%.2f  Total:%.2f\n",
-                  values[0], values[1], values[2], values[3], values[4]);
-        } else {
-          fprintf(stderr, "Y:%.2f U:%.2f V:%.2f A:%.2f  Total:%.2f\n",
-                  values[0], values[1], values[2], values[3], values[4]);
-        }
+        fprintf(stderr, "B:%.2f G:%.2f R:%.2f A:%.2f  Total:%.2f\n",
+                values[0], values[1], values[2], values[3], values[4]);
       } else {
         fprintf(stderr, "%7d %.4f\n", picture.stats->coded_size, values[4]);
       }

examples/dwebp.c

@@ -20,27 +20,9 @@
 #include "webp/config.h"
 #endif
 
-#ifdef WEBP_HAVE_PNG
-#include <png.h>
-#include <setjmp.h>   // note: this must be included *after* png.h
-#endif
-
-#ifdef HAVE_WINCODEC_H
-#ifdef __MINGW32__
-#define INITGUID  // Without this GUIDs are declared extern and fail to link
-#endif
-#define CINTERFACE
-#define COBJMACROS
-#define _WIN32_IE 0x500  // Workaround bug in shlwapi.h when compiling C++
-                         // code with COBJMACROS.
-#include <ole2.h>  // CreateStreamOnHGlobal()
-#include <shlwapi.h>
-#include <windows.h>
-#include <wincodec.h>
-#endif
-
-#include "webp/decode.h"
-#include "./example_util.h"
+#include "../examples/example_util.h"
+#include "../imageio/image_enc.h"
+#include "../imageio/webpdec.h"
 #include "./stopwatch.h"
 
 static int verbose = 0;
@@ -57,486 +39,18 @@ extern void* VP8GetCPUInfo;   // opaque forward declaration.
 #endif
 #endif  // WEBP_DLL
 
-//------------------------------------------------------------------------------
-
-// Output types
-typedef enum {
-  PNG = 0,
-  PAM,
-  PPM,
-  PGM,
-  BMP,
-  TIFF,
-  RAW_YUV,
-  ALPHA_PLANE_ONLY,  // this is for experimenting only
-  // forced colorspace output (for testing, mostly)
-  RGB, RGBA, BGR, BGRA, ARGB,
-  RGBA_4444, RGB_565,
-  rgbA, bgrA, Argb, rgbA_4444,
-  YUV, YUVA
-} OutputFileFormat;
-
-#ifdef HAVE_WINCODEC_H
-
-#define IFS(fn)                                                     \
-  do {                                                              \
-    if (SUCCEEDED(hr)) {                                            \
-      hr = (fn);                                                    \
-      if (FAILED(hr)) fprintf(stderr, #fn " failed %08lx\n", hr);   \
-    }                                                               \
-  } while (0)
-
-#ifdef __cplusplus
-#define MAKE_REFGUID(x) (x)
-#else
-#define MAKE_REFGUID(x) &(x)
-#endif
-
-static HRESULT CreateOutputStream(const char* out_file_name,
-                                  int write_to_mem, IStream** stream) {
-  HRESULT hr = S_OK;
-  if (write_to_mem) {
-    // Output to a memory buffer. This is freed when 'stream' is released.
-    IFS(CreateStreamOnHGlobal(NULL, TRUE, stream));
-  } else {
-    IFS(SHCreateStreamOnFileA(out_file_name, STGM_WRITE | STGM_CREATE, stream));
-  }
-  if (FAILED(hr)) {
-    fprintf(stderr, "Error opening output file %s (%08lx)\n",
-            out_file_name, hr);
-  }
-  return hr;
-}
-
-static HRESULT WriteUsingWIC(const char* out_file_name, int use_stdout,
-                             REFGUID container_guid,
-                             uint8_t* rgb, int stride,
-                             uint32_t width, uint32_t height, int has_alpha) {
-  HRESULT hr = S_OK;
-  IWICImagingFactory* factory = NULL;
-  IWICBitmapFrameEncode* frame = NULL;
-  IWICBitmapEncoder* encoder = NULL;
-  IStream* stream = NULL;
-  WICPixelFormatGUID pixel_format = has_alpha ? GUID_WICPixelFormat32bppBGRA
-                                              : GUID_WICPixelFormat24bppBGR;
-
-  IFS(CoInitialize(NULL));
-  IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
-                       CLSCTX_INPROC_SERVER,
-                       MAKE_REFGUID(IID_IWICImagingFactory),
-                       (LPVOID*)&factory));
-  if (hr == REGDB_E_CLASSNOTREG) {
-    fprintf(stderr,
-            "Couldn't access Windows Imaging Component (are you running "
-            "Windows XP SP3 or newer?). PNG support not available. "
-            "Use -ppm or -pgm for available PPM and PGM formats.\n");
-  }
-  IFS(CreateOutputStream(out_file_name, use_stdout, &stream));
-  IFS(IWICImagingFactory_CreateEncoder(factory, container_guid, NULL,
-                                       &encoder));
-  IFS(IWICBitmapEncoder_Initialize(encoder, stream,
-                                   WICBitmapEncoderNoCache));
-  IFS(IWICBitmapEncoder_CreateNewFrame(encoder, &frame, NULL));
-  IFS(IWICBitmapFrameEncode_Initialize(frame, NULL));
-  IFS(IWICBitmapFrameEncode_SetSize(frame, width, height));
-  IFS(IWICBitmapFrameEncode_SetPixelFormat(frame, &pixel_format));
-  IFS(IWICBitmapFrameEncode_WritePixels(frame, height, stride,
-                                        height * stride, rgb));
-  IFS(IWICBitmapFrameEncode_Commit(frame));
-  IFS(IWICBitmapEncoder_Commit(encoder));
-
-  if (SUCCEEDED(hr) && use_stdout) {
-    HGLOBAL image;
-    IFS(GetHGlobalFromStream(stream, &image));
-    if (SUCCEEDED(hr)) {
-      HANDLE std_output = GetStdHandle(STD_OUTPUT_HANDLE);
-      DWORD mode;
-      const BOOL update_mode = GetConsoleMode(std_output, &mode);
-      const void* const image_mem = GlobalLock(image);
-      DWORD bytes_written = 0;
-
-      // Clear output processing if necessary, then output the image.
-      if (update_mode) SetConsoleMode(std_output, 0);
-      if (!WriteFile(std_output, image_mem, (DWORD)GlobalSize(image),
-                     &bytes_written, NULL) ||
-          bytes_written != GlobalSize(image)) {
-        hr = E_FAIL;
-      }
-      if (update_mode) SetConsoleMode(std_output, mode);
-      GlobalUnlock(image);
-    }
-  }
-
-  if (frame != NULL) IUnknown_Release(frame);
-  if (encoder != NULL) IUnknown_Release(encoder);
-  if (factory != NULL) IUnknown_Release(factory);
-  if (stream != NULL) IUnknown_Release(stream);
-  return hr;
-}
-
-static int WritePNG(const char* out_file_name, int use_stdout,
-                    const WebPDecBuffer* const buffer) {
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  uint8_t* const rgb = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
-
-  return SUCCEEDED(WriteUsingWIC(out_file_name, use_stdout,
-                                 MAKE_REFGUID(GUID_ContainerFormatPng),
-                                 rgb, stride, width, height, has_alpha));
-}
-
-#elif defined(WEBP_HAVE_PNG)    // !HAVE_WINCODEC_H
-static void PNGAPI PNGErrorFunction(png_structp png, png_const_charp dummy) {
-  (void)dummy;  // remove variable-unused warning
-  longjmp(png_jmpbuf(png), 1);
-}
-
-static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  uint8_t* const rgb = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
-  volatile png_structp png;
-  volatile png_infop info;
-  png_uint_32 y;
-
-  png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
-                                NULL, PNGErrorFunction, NULL);
-  if (png == NULL) {
-    return 0;
-  }
-  info = png_create_info_struct(png);
-  if (info == NULL) {
-    png_destroy_write_struct((png_structpp)&png, NULL);
-    return 0;
-  }
-  if (setjmp(png_jmpbuf(png))) {
-    png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
-    return 0;
-  }
-  png_init_io(png, out_file);
-  png_set_IHDR(png, info, width, height, 8,
-               has_alpha ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
-               PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
-               PNG_FILTER_TYPE_DEFAULT);
-  png_write_info(png, info);
-  for (y = 0; y < height; ++y) {
-    png_bytep row = rgb + y * stride;
-    png_write_rows(png, &row, 1);
-  }
-  png_write_end(png, info);
-  png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
-  return 1;
-}
-#else    // !HAVE_WINCODEC_H && !WEBP_HAVE_PNG
-static int WritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
-  (void)out_file;
-  (void)buffer;
-  fprintf(stderr, "PNG support not compiled. Please install the libpng "
-          "development package before building.\n");
-  fprintf(stderr, "You can run with -ppm flag to decode in PPM format.\n");
-  return 0;
-}
-#endif
-
-static int WritePPM(FILE* fout, const WebPDecBuffer* const buffer, int alpha) {
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  const uint8_t* const rgb = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const size_t bytes_per_px = alpha ? 4 : 3;
-  uint32_t y;
-
-  if (alpha) {
-    fprintf(fout, "P7\nWIDTH %u\nHEIGHT %u\nDEPTH 4\nMAXVAL 255\n"
-                  "TUPLTYPE RGB_ALPHA\nENDHDR\n", width, height);
-  } else {
-    fprintf(fout, "P6\n%u %u\n255\n", width, height);
-  }
-  for (y = 0; y < height; ++y) {
-    if (fwrite(rgb + y * stride, width, bytes_per_px, fout) != bytes_per_px) {
-      return 0;
-    }
-  }
-  return 1;
-}
-
-// Save 16b mode (RGBA4444, RGB565, ...) for debugging purpose.
-static int Write16bAsPGM(FILE* fout, const WebPDecBuffer* const buffer) {
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  const uint8_t* const rgba = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const uint32_t bytes_per_px = 2;
-  uint32_t y;
-
-  fprintf(fout, "P5\n%u %u\n255\n", width * bytes_per_px, height);
-  for (y = 0; y < height; ++y) {
-    if (fwrite(rgba + y * stride, width, bytes_per_px, fout) != bytes_per_px) {
-      return 0;
-    }
-  }
-  return 1;
-}
-
-static void PutLE16(uint8_t* const dst, uint32_t value) {
-  dst[0] = (value >> 0) & 0xff;
-  dst[1] = (value >> 8) & 0xff;
-}
-
-static void PutLE32(uint8_t* const dst, uint32_t value) {
-  PutLE16(dst + 0, (value >>  0) & 0xffff);
-  PutLE16(dst + 2, (value >> 16) & 0xffff);
-}
-
-#define BMP_HEADER_SIZE 54
-static int WriteBMP(FILE* fout, const WebPDecBuffer* const buffer) {
-  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  const uint8_t* const rgba = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const uint32_t bytes_per_px = has_alpha ? 4 : 3;
-  uint32_t y;
-  const uint32_t line_size = bytes_per_px * width;
-  const uint32_t bmp_stride = (line_size + 3) & ~3;   // pad to 4
-  const uint32_t total_size = bmp_stride * height + BMP_HEADER_SIZE;
-  uint8_t bmp_header[BMP_HEADER_SIZE] = { 0 };
-
-  // bitmap file header
-  PutLE16(bmp_header + 0, 0x4d42);                // signature 'BM'
-  PutLE32(bmp_header + 2, total_size);            // size including header
-  PutLE32(bmp_header + 6, 0);                     // reserved
-  PutLE32(bmp_header + 10, BMP_HEADER_SIZE);      // offset to pixel array
-  // bitmap info header
-  PutLE32(bmp_header + 14, 40);                   // DIB header size
-  PutLE32(bmp_header + 18, width);                // dimensions
-  PutLE32(bmp_header + 22, -(int)height);         // vertical flip!
-  PutLE16(bmp_header + 26, 1);                    // number of planes
-  PutLE16(bmp_header + 28, bytes_per_px * 8);     // bits per pixel
-  PutLE32(bmp_header + 30, 0);                    // no compression (BI_RGB)
-  PutLE32(bmp_header + 34, 0);                    // image size (dummy)
-  PutLE32(bmp_header + 38, 2400);                 // x pixels/meter
-  PutLE32(bmp_header + 42, 2400);                 // y pixels/meter
-  PutLE32(bmp_header + 46, 0);                    // number of palette colors
-  PutLE32(bmp_header + 50, 0);                    // important color count
-
-  // TODO(skal): color profile
-
-  // write header
-  if (fwrite(bmp_header, sizeof(bmp_header), 1, fout) != 1) {
-    return 0;
-  }
-
-  // write pixel array
-  for (y = 0; y < height; ++y) {
-    if (fwrite(rgba + y * stride, line_size, 1, fout) != 1) {
-      return 0;
-    }
-    // write padding zeroes
-    if (bmp_stride != line_size) {
-      const uint8_t zeroes[3] = { 0 };
-      if (fwrite(zeroes, bmp_stride - line_size, 1, fout) != 1) {
-        return 0;
-      }
-    }
-  }
-  return 1;
-}
-#undef BMP_HEADER_SIZE
-
-#define NUM_IFD_ENTRIES 15
-#define EXTRA_DATA_SIZE 16
-// 10b for signature/header + n * 12b entries + 4b for IFD terminator:
-#define EXTRA_DATA_OFFSET (10 + 12 * NUM_IFD_ENTRIES + 4)
-#define TIFF_HEADER_SIZE (EXTRA_DATA_OFFSET + EXTRA_DATA_SIZE)
-
-static int WriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) {
-  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  const uint8_t* const rgba = buffer->u.RGBA.rgba;
-  const int stride = buffer->u.RGBA.stride;
-  const uint8_t bytes_per_px = has_alpha ? 4 : 3;
-  // For non-alpha case, we omit tag 0x152 (ExtraSamples).
-  const uint8_t num_ifd_entries = has_alpha ? NUM_IFD_ENTRIES
-                                            : NUM_IFD_ENTRIES - 1;
-  uint8_t tiff_header[TIFF_HEADER_SIZE] = {
-    0x49, 0x49, 0x2a, 0x00,   // little endian signature
-    8, 0, 0, 0,               // offset to the unique IFD that follows
-    // IFD (offset = 8). Entries must be written in increasing tag order.
-    num_ifd_entries, 0,       // Number of entries in the IFD (12 bytes each).
-    0x00, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    //  10: Width  (TBD)
-    0x01, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    //  22: Height (TBD)
-    0x02, 0x01, 3, 0, bytes_per_px, 0, 0, 0,     //  34: BitsPerSample: 8888
-        EXTRA_DATA_OFFSET + 0, 0, 0, 0,
-    0x03, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    //  46: Compression: none
-    0x06, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0,    //  58: Photometric: RGB
-    0x11, 0x01, 4, 0, 1, 0, 0, 0,                //  70: Strips offset:
-        TIFF_HEADER_SIZE, 0, 0, 0,               //      data follows header
-    0x12, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    //  82: Orientation: topleft
-    0x15, 0x01, 3, 0, 1, 0, 0, 0,                //  94: SamplesPerPixels
-        bytes_per_px, 0, 0, 0,
-    0x16, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    // 106: Rows per strip (TBD)
-    0x17, 0x01, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0,    // 118: StripByteCount (TBD)
-    0x1a, 0x01, 5, 0, 1, 0, 0, 0,                // 130: X-resolution
-        EXTRA_DATA_OFFSET + 8, 0, 0, 0,
-    0x1b, 0x01, 5, 0, 1, 0, 0, 0,                // 142: Y-resolution
-        EXTRA_DATA_OFFSET + 8, 0, 0, 0,
-    0x1c, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    // 154: PlanarConfiguration
-    0x28, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0,    // 166: ResolutionUnit (inch)
-    0x52, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    // 178: ExtraSamples: rgbA
-    0, 0, 0, 0,                                  // 190: IFD terminator
-    // EXTRA_DATA_OFFSET:
-    8, 0, 8, 0, 8, 0, 8, 0,      // BitsPerSample
-    72, 0, 0, 0, 1, 0, 0, 0      // 72 pixels/inch, for X/Y-resolution
-  };
-  uint32_t y;
-
-  // Fill placeholders in IFD:
-  PutLE32(tiff_header + 10 + 8, width);
-  PutLE32(tiff_header + 22 + 8, height);
-  PutLE32(tiff_header + 106 + 8, height);
-  PutLE32(tiff_header + 118 + 8, width * bytes_per_px * height);
-  if (!has_alpha) PutLE32(tiff_header + 178, 0);  // IFD terminator
-
-  // write header
-  if (fwrite(tiff_header, sizeof(tiff_header), 1, fout) != 1) {
-    return 0;
-  }
-  // write pixel values
-  for (y = 0; y < height; ++y) {
-    if (fwrite(rgba + y * stride, bytes_per_px, width, fout) != width) {
-      return 0;
-    }
-  }
-
-  return 1;
-}
-
-#undef TIFF_HEADER_SIZE
-#undef EXTRA_DATA_OFFSET
-#undef EXTRA_DATA_SIZE
-#undef NUM_IFD_ENTRIES
-
-static int WriteAlphaPlane(FILE* fout, const WebPDecBuffer* const buffer) {
-  const uint32_t width = buffer->width;
-  const uint32_t height = buffer->height;
-  const uint8_t* const a = buffer->u.YUVA.a;
-  const int a_stride = buffer->u.YUVA.a_stride;
-  uint32_t y;
-  assert(a != NULL);
-  fprintf(fout, "P5\n%u %u\n255\n", width, height);
-  for (y = 0; y < height; ++y) {
-    if (fwrite(a + y * a_stride, width, 1, fout) != 1) {
-      return 0;
-    }
-  }
-  return 1;
-}
-
-// format=PGM: save a grayscale PGM file using the IMC4 layout
-// (http://www.fourcc.org/yuv.php#IMC4). This is a very convenient format for
-// viewing the samples, esp. for odd dimensions.
-// format=RAW_YUV: just save the Y/U/V/A planes sequentially without header.
-static int WritePGMOrYUV(FILE* fout, const WebPDecBuffer* const buffer,
-                         OutputFileFormat format) {
-  const int width = buffer->width;
-  const int height = buffer->height;
-  const WebPYUVABuffer* const yuv = &buffer->u.YUVA;
-  int ok = 1;
-  int y;
-  const int pad = (format == RAW_YUV) ? 0 : 1;
-  const int uv_width = (width + 1) / 2;
-  const int uv_height = (height + 1) / 2;
-  const int out_stride = (width + pad) & ~pad;
-  const int a_height = yuv->a ? height : 0;
-  if (format == PGM) {
-    fprintf(fout, "P5\n%d %d\n255\n",
-            out_stride, height + uv_height + a_height);
-  }
-  for (y = 0; ok && y < height; ++y) {
-    ok &= (fwrite(yuv->y + y * yuv->y_stride, width, 1, fout) == 1);
-    if (format == PGM) {
-      if (width & 1) fputc(0, fout);    // padding byte
-    }
-  }
-  if (format == PGM) {   // IMC4 layout
-    for (y = 0; ok && y < uv_height; ++y) {
-      ok &= (fwrite(yuv->u + y * yuv->u_stride, uv_width, 1, fout) == 1);
-      ok &= (fwrite(yuv->v + y * yuv->v_stride, uv_width, 1, fout) == 1);
-    }
-  } else {
-    for (y = 0; ok && y < uv_height; ++y) {
-      ok &= (fwrite(yuv->u + y * yuv->u_stride, uv_width, 1, fout) == 1);
-    }
-    for (y = 0; ok && y < uv_height; ++y) {
-      ok &= (fwrite(yuv->v + y * yuv->v_stride, uv_width, 1, fout) == 1);
-    }
-  }
-  for (y = 0; ok && y < a_height; ++y) {
-    ok &= (fwrite(yuv->a + y * yuv->a_stride, width, 1, fout) == 1);
-    if (format == PGM) {
-      if (width & 1) fputc(0, fout);    // padding byte
-    }
-  }
-  return ok;
-}
 
 static int SaveOutput(const WebPDecBuffer* const buffer,
-                      OutputFileFormat format, const char* const out_file) {
-  FILE* fout = NULL;
-  int needs_open_file = 1;
-  const int use_stdout = !strcmp(out_file, "-");
+                      WebPOutputFileFormat format, const char* const out_file) {
+  const int use_stdout = (out_file != NULL) && !strcmp(out_file, "-");
   int ok = 1;
   Stopwatch stop_watch;
 
   if (verbose) {
     StopwatchReset(&stop_watch);
   }
+  ok = WebPSaveImage(buffer, format, out_file);
 
-#ifdef HAVE_WINCODEC_H
-  needs_open_file = (format != PNG);
-#endif
-
-  if (needs_open_file) {
-    fout = use_stdout ? ExUtilSetBinaryMode(stdout) : fopen(out_file, "wb");
-    if (fout == NULL) {
-      fprintf(stderr, "Error opening output file %s\n", out_file);
-      return 0;
-    }
-  }
-
-  if (format == PNG ||
-      format == RGBA || format == BGRA || format == ARGB ||
-      format == rgbA || format == bgrA || format == Argb) {
-#ifdef HAVE_WINCODEC_H
-    ok &= WritePNG(out_file, use_stdout, buffer);
-#else
-    ok &= WritePNG(fout, buffer);
-#endif
-  } else if (format == PAM) {
-    ok &= WritePPM(fout, buffer, 1);
-  } else if (format == PPM || format == RGB || format == BGR) {
-    ok &= WritePPM(fout, buffer, 0);
-  } else if (format == RGBA_4444 || format == RGB_565 || format == rgbA_4444) {
-    ok &= Write16bAsPGM(fout, buffer);
-  } else if (format == BMP) {
-    ok &= WriteBMP(fout, buffer);
-  } else if (format == TIFF) {
-    ok &= WriteTIFF(fout, buffer);
-  } else if (format == PGM || format == RAW_YUV ||
-             format == YUV || format == YUVA) {
-    ok &= WritePGMOrYUV(fout, buffer, format == RAW_YUV ? RAW_YUV : PGM);
-  } else if (format == ALPHA_PLANE_ONLY) {
-    ok &= WriteAlphaPlane(fout, buffer);
-  }
-  if (fout != NULL && fout != stdout) {
-    fclose(fout);
-  }
   if (ok) {
     if (!quiet) {
       if (use_stdout) {
@@ -598,7 +112,7 @@ static const char* const kFormatType[] = {
 };
 
 static uint8_t* AllocateExternalBuffer(WebPDecoderConfig* config,
-                                       OutputFileFormat format,
+                                       WebPOutputFileFormat format,
                                        int use_external_memory) {
   uint8_t* external_buffer = NULL;
   WebPDecBuffer* const output_buffer = &config->output;
@@ -669,7 +183,7 @@ int main(int argc, const char *argv[]) {
   WebPDecoderConfig config;
   WebPDecBuffer* const output_buffer = &config.output;
   WebPBitstreamFeatures* const bitstream = &config.input;
-  OutputFileFormat format = PNG;
+  WebPOutputFileFormat format = PNG;
   uint8_t* external_buffer = NULL;
   int use_external_memory = 0;
   const uint8_t* data = NULL;
@@ -797,7 +311,7 @@ int main(int argc, const char *argv[]) {
   {
     VP8StatusCode status = VP8_STATUS_OK;
     size_t data_size = 0;
-    if (!ExUtilLoadWebP(in_file, &data, &data_size, bitstream)) {
+    if (!LoadWebP(in_file, &data, &data_size, bitstream)) {
       return -1;
     }
 
@@ -818,9 +332,8 @@ int main(int argc, const char *argv[]) {
       case BMP:
         output_buffer->colorspace = bitstream->has_alpha ? MODE_BGRA : MODE_BGR;
         break;
-      case TIFF:    // note: force pre-multiplied alpha
-        output_buffer->colorspace =
-            bitstream->has_alpha ? MODE_rgbA : MODE_RGB;
+      case TIFF:
+        output_buffer->colorspace = bitstream->has_alpha ? MODE_RGBA : MODE_RGB;
         break;
       case PGM:
       case RAW_YUV:
@@ -852,15 +365,24 @@ int main(int argc, const char *argv[]) {
       if (external_buffer == NULL) goto Exit;
     }
 
-    if (incremental) {
-      status = ExUtilDecodeWebPIncremental(data, data_size, verbose, &config);
-    } else {
-      status = ExUtilDecodeWebP(data, data_size, verbose, &config);
+    {
+      Stopwatch stop_watch;
+      if (verbose) StopwatchReset(&stop_watch);
+
+      if (incremental) {
+        status = DecodeWebPIncremental(data, data_size, &config);
+      } else {
+        status = DecodeWebP(data, data_size, &config);
+      }
+      if (verbose) {
+        const double decode_time = StopwatchReadAndReset(&stop_watch);
+        fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
+      }
     }
 
     ok = (status == VP8_STATUS_OK);
     if (!ok) {
-      ExUtilPrintWebPError(in_file, status);
+      PrintWebPError(in_file, status);
       goto Exit;
     }
   }

examples/example_util.c

@@ -12,17 +12,10 @@
 
 #include "./example_util.h"
 
-#if defined(_WIN32)
-#include <fcntl.h>   // for _O_BINARY
-#include <io.h>      // for _setmode()
-#endif
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include "webp/decode.h"
-#include "./stopwatch.h"
-
 //------------------------------------------------------------------------------
 // String parsing
 
@@ -41,6 +34,18 @@ int ExUtilGetInt(const char* const v, int base, int* const error) {
   return (int)ExUtilGetUInt(v, base, error);
 }
 
+int ExUtilGetInts(const char* v, int base, int max_output, int output[]) {
+  int n, error = 0;
+  for (n = 0; v != NULL && n < max_output; ++n) {
+    const int value = ExUtilGetInt(v, base, &error);
+    if (error) return -1;
+    output[n] = value;
+    v = strchr(v, ',');
+    if (v != NULL) ++v;   // skip over the trailing ','
+  }
+  return n;
+}
+
 float ExUtilGetFloat(const char* const v, int* const error) {
   char* end = NULL;
   const float f = (v != NULL) ? (float)strtod(v, &end) : 0.f;
@@ -51,238 +56,3 @@ float ExUtilGetFloat(const char* const v, int* const error) {
   }
   return f;
 }
-
-// -----------------------------------------------------------------------------
-// File I/O
-
-FILE* ExUtilSetBinaryMode(FILE* file) {
-#if defined(_WIN32)
-  if (_setmode(_fileno(file), _O_BINARY) == -1) {
-    fprintf(stderr, "Failed to reopen file in O_BINARY mode.\n");
-    return NULL;
-  }
-#endif
-  return file;
-}
-
-int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size) {
-  static const size_t kBlockSize = 16384;  // default initial size
-  size_t max_size = 0;
-  size_t size = 0;
-  uint8_t* input = NULL;
-
-  if (data == NULL || data_size == NULL) return 0;
-  *data = NULL;
-  *data_size = 0;
-
-  if (!ExUtilSetBinaryMode(stdin)) return 0;
-
-  while (!feof(stdin)) {
-    // We double the buffer size each time and read as much as possible.
-    const size_t extra_size = (max_size == 0) ? kBlockSize : max_size;
-    void* const new_data = realloc(input, max_size + extra_size);
-    if (new_data == NULL) goto Error;
-    input = (uint8_t*)new_data;
-    max_size += extra_size;
-    size += fread(input + size, 1, extra_size, stdin);
-    if (size < max_size) break;
-  }
-  if (ferror(stdin)) goto Error;
-  *data = input;
-  *data_size = size;
-  return 1;
-
- Error:
-  free(input);
-  fprintf(stderr, "Could not read from stdin\n");
-  return 0;
-}
-
-int ExUtilReadFile(const char* const file_name,
-                   const uint8_t** data, size_t* data_size) {
-  int ok;
-  void* file_data;
-  size_t file_size;
-  FILE* in;
-  const int from_stdin = (file_name == NULL) || !strcmp(file_name, "-");
-
-  if (from_stdin) return ExUtilReadFromStdin(data, data_size);
-
-  if (data == NULL || data_size == NULL) return 0;
-  *data = NULL;
-  *data_size = 0;
-
-  in = fopen(file_name, "rb");
-  if (in == NULL) {
-    fprintf(stderr, "cannot open input file '%s'\n", file_name);
-    return 0;
-  }
-  fseek(in, 0, SEEK_END);
-  file_size = ftell(in);
-  fseek(in, 0, SEEK_SET);
-  file_data = malloc(file_size);
-  if (file_data == NULL) return 0;
-  ok = (fread(file_data, file_size, 1, in) == 1);
-  fclose(in);
-
-  if (!ok) {
-    fprintf(stderr, "Could not read %d bytes of data from file %s\n",
-            (int)file_size, file_name);
-    free(file_data);
-    return 0;
-  }
-  *data = (uint8_t*)file_data;
-  *data_size = file_size;
-  return 1;
-}
-
-int ExUtilWriteFile(const char* const file_name,
-                    const uint8_t* data, size_t data_size) {
-  int ok;
-  FILE* out;
-  const int to_stdout = (file_name == NULL) || !strcmp(file_name, "-");
-
-  if (data == NULL) {
-    return 0;
-  }
-  out = to_stdout ? stdout : fopen(file_name, "wb");
-  if (out == NULL) {
-    fprintf(stderr, "Error! Cannot open output file '%s'\n", file_name);
-    return 0;
-  }
-  ok = (fwrite(data, data_size, 1, out) == 1);
-  if (out != stdout) fclose(out);
-  return ok;
-}
-
-//------------------------------------------------------------------------------
-// WebP decoding
-
-static const char* const kStatusMessages[VP8_STATUS_NOT_ENOUGH_DATA + 1] = {
-  "OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
-  "UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
-};
-
-static void PrintAnimationWarning(const WebPDecoderConfig* const config) {
-  if (config->input.has_animation) {
-    fprintf(stderr,
-            "Error! Decoding of an animated WebP file is not supported.\n"
-            "       Use webpmux to extract the individual frames or\n"
-            "       vwebp to view this image.\n");
-  }
-}
-
-void ExUtilPrintWebPError(const char* const in_file, int status) {
-  fprintf(stderr, "Decoding of %s failed.\n", in_file);
-  fprintf(stderr, "Status: %d", status);
-  if (status >= VP8_STATUS_OK && status <= VP8_STATUS_NOT_ENOUGH_DATA) {
-    fprintf(stderr, "(%s)", kStatusMessages[status]);
-  }
-  fprintf(stderr, "\n");
-}
-
-int ExUtilLoadWebP(const char* const in_file,
-                   const uint8_t** data, size_t* data_size,
-                   WebPBitstreamFeatures* bitstream) {
-  VP8StatusCode status;
-  WebPBitstreamFeatures local_features;
-  if (!ExUtilReadFile(in_file, data, data_size)) return 0;
-
-  if (bitstream == NULL) {
-    bitstream = &local_features;
-  }
-
-  status = WebPGetFeatures(*data, *data_size, bitstream);
-  if (status != VP8_STATUS_OK) {
-    free((void*)*data);
-    *data = NULL;
-    *data_size = 0;
-    ExUtilPrintWebPError(in_file, status);
-    return 0;
-  }
-  return 1;
-}
-
-//------------------------------------------------------------------------------
-
-VP8StatusCode ExUtilDecodeWebP(const uint8_t* const data, size_t data_size,
-                               int verbose, WebPDecoderConfig* const config) {
-  Stopwatch stop_watch;
-  VP8StatusCode status = VP8_STATUS_OK;
-  if (config == NULL) return VP8_STATUS_INVALID_PARAM;
-
-  PrintAnimationWarning(config);
-
-  StopwatchReset(&stop_watch);
-
-  // Decoding call.
-  status = WebPDecode(data, data_size, config);
-
-  if (verbose) {
-    const double decode_time = StopwatchReadAndReset(&stop_watch);
-    fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
-  }
-  return status;
-}
-
-VP8StatusCode ExUtilDecodeWebPIncremental(
-    const uint8_t* const data, size_t data_size,
-    int verbose, WebPDecoderConfig* const config) {
-  Stopwatch stop_watch;
-  VP8StatusCode status = VP8_STATUS_OK;
-  if (config == NULL) return VP8_STATUS_INVALID_PARAM;
-
-  PrintAnimationWarning(config);
-
-  StopwatchReset(&stop_watch);
-
-  // Decoding call.
-  {
-    WebPIDecoder* const idec = WebPIDecode(data, data_size, config);
-    if (idec == NULL) {
-      fprintf(stderr, "Failed during WebPINewDecoder().\n");
-      return VP8_STATUS_OUT_OF_MEMORY;
-    } else {
-#ifdef WEBP_EXPERIMENTAL_FEATURES
-      size_t size = 0;
-      const size_t incr = 2 + (data_size / 20);
-      while (size < data_size) {
-        size_t next_size = size + (rand() % incr);
-        if (next_size > data_size) next_size = data_size;
-        status = WebPIUpdate(idec, data, next_size);
-        if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) break;
-        size = next_size;
-      }
-#else
-      status = WebPIUpdate(idec, data, data_size);
-#endif
-      WebPIDelete(idec);
-    }
-  }
-
-  if (verbose) {
-    const double decode_time = StopwatchReadAndReset(&stop_watch);
-    fprintf(stderr, "Time to decode picture: %.3fs\n", decode_time);
-  }
-  return status;
-}
-
-// -----------------------------------------------------------------------------
-
-void ExUtilCopyPlane(const uint8_t* src, int src_stride,
-                     uint8_t* dst, int dst_stride, int width, int height) {
-  while (height-- > 0) {
-    memcpy(dst, src, width * sizeof(*dst));
-    src += src_stride;
-    dst += dst_stride;
-  }
-}
-
-// -----------------------------------------------------------------------------
-
-int ImgIoUtilCheckSizeArgumentsOverflow(uint64_t nmemb, size_t size) {
-  const uint64_t total_size = nmemb * size;
-  return (total_size == (size_t)total_size);
-}
-
-// -----------------------------------------------------------------------------

examples/example_util.h

@@ -13,8 +13,7 @@
 #ifndef WEBP_EXAMPLES_EXAMPLE_UTIL_H_
 #define WEBP_EXAMPLES_EXAMPLE_UTIL_H_
 
-#include <stdio.h>
-#include "webp/decode.h"
+#include "webp/types.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -30,68 +29,11 @@ uint32_t ExUtilGetUInt(const char* const v, int base, int* const error);
 int ExUtilGetInt(const char* const v, int base, int* const error);
 float ExUtilGetFloat(const char* const v, int* const error);
 
-//------------------------------------------------------------------------------
-// File I/O
-
-// Reopen file in binary (O_BINARY) mode.
-// Returns 'file' on success, NULL otherwise.
-FILE* ExUtilSetBinaryMode(FILE* file);
-
-// Allocates storage for entire file 'file_name' and returns contents and size
-// in 'data' and 'data_size'. Returns 1 on success, 0 otherwise. '*data' should
-// be deleted using free().
-// If 'file_name' is NULL or equal to "-", input is read from stdin by calling
-// the function ExUtilReadFromStdin().
-int ExUtilReadFile(const char* const file_name,
-                   const uint8_t** data, size_t* data_size);
-
-// Same as ExUtilReadFile(), but reads until EOF from stdin instead.
-int ExUtilReadFromStdin(const uint8_t** data, size_t* data_size);
-
-// Write a data segment into a file named 'file_name'. Returns true if ok.
-// If 'file_name' is NULL or equal to "-", output is written to stdout.
-int ExUtilWriteFile(const char* const file_name,
-                    const uint8_t* data, size_t data_size);
-
-//------------------------------------------------------------------------------
-
-// Copy width x height pixels from 'src' to 'dst' honoring the strides.
-void ExUtilCopyPlane(const uint8_t* src, int src_stride,
-                     uint8_t* dst, int dst_stride, int width, int height);
-
-//------------------------------------------------------------------------------
-
-// Returns 0 in case of overflow of nmemb * size.
-int ImgIoUtilCheckSizeArgumentsOverflow(uint64_t nmemb, size_t size);
-
-//------------------------------------------------------------------------------
-// WebP decoding
-
-// Prints an informative error message regarding decode failure of 'in_file'.
-// 'status' is treated as a VP8StatusCode and if valid will be printed as a
-// text string.
-void ExUtilPrintWebPError(const char* const in_file, int status);
-
-// Reads a WebP from 'in_file', returning the contents and size in 'data' and
-// 'data_size'. If not NULL, 'bitstream' is populated using WebPGetFeatures().
-// Returns true on success.
-int ExUtilLoadWebP(const char* const in_file,
-                   const uint8_t** data, size_t* data_size,
-                   WebPBitstreamFeatures* bitstream);
-
-// Decodes the WebP contained in 'data'.
-// 'config' is a structure previously initialized by WebPInitDecoderConfig().
-// 'config->output' should have the desired colorspace selected. 'verbose' will
-// cause decode timing to be reported.
-// Returns the decoder status. On success 'config->output' will contain the
-// decoded picture.
-VP8StatusCode ExUtilDecodeWebP(const uint8_t* const data, size_t data_size,
-                               int verbose, WebPDecoderConfig* const config);
-
-// Same as ExUtilDecodeWebP(), but using the incremental decoder.
-VP8StatusCode ExUtilDecodeWebPIncremental(
-    const uint8_t* const data, size_t data_size,
-    int verbose, WebPDecoderConfig* const config);
+// This variant of ExUtilGetInt() will parse multiple integers from a
+// comma-separated list. Up to 'max_output' integers are parsed.
+// The result is placed in the output[] array, and the number of integers
+// actually parsed is returned, or -1 if an error occurred.
+int ExUtilGetInts(const char* v, int base, int max_output, int output[]);
 
 #ifdef __cplusplus
 }    // extern "C"

examples/gif2webp.c

@@ -26,7 +26,8 @@
 #include <gif_lib.h>
 #include "webp/encode.h"
 #include "webp/mux.h"
-#include "./example_util.h"
+#include "../examples/example_util.h"
+#include "../imageio/imageio_util.h"
 #include "./gifdec.h"
 
 //------------------------------------------------------------------------------
@@ -501,7 +502,7 @@ int main(int argc, const char *argv[]) {
   }
 
   if (out_file != NULL) {
-    if (!ExUtilWriteFile(out_file, webp_data.bytes, webp_data.size)) {
+    if (!ImgIoUtilWriteFile(out_file, webp_data.bytes, webp_data.size)) {
       fprintf(stderr, "Error writing output file: %s\n", out_file);
       goto End;
     }

examples/gifdec.c

@@ -21,18 +21,24 @@
 #include "webp/encode.h"
 #include "webp/mux_types.h"
 
-#define GIF_TRANSPARENT_COLOR 0x00000000
-#define GIF_WHITE_COLOR       0xffffffff
+#define GIF_TRANSPARENT_COLOR 0x00000000u
+#define GIF_WHITE_COLOR       0xffffffffu
 #define GIF_TRANSPARENT_MASK  0x01
 #define GIF_DISPOSE_MASK      0x07
 #define GIF_DISPOSE_SHIFT     2
 
 // from utils/utils.h
+#ifdef __cplusplus
+extern "C" {
+#endif
 extern void WebPCopyPlane(const uint8_t* src, int src_stride,
                           uint8_t* dst, int dst_stride,
                           int width, int height);
 extern void WebPCopyPixels(const WebPPicture* const src,
                            WebPPicture* const dst);
+#ifdef __cplusplus
+}
+#endif
 
 void GIFGetBackgroundColor(const ColorMapObject* const color_map,
                            int bgcolor_index, int transparent_index,
@@ -48,7 +54,7 @@ void GIFGetBackgroundColor(const ColorMapObject* const color_map,
             "white background.\n");
   } else {
     const GifColorType color = color_map->Colors[bgcolor_index];
-    *bgcolor = (0xff        << 24)
+    *bgcolor = (0xffu       << 24)
              | (color.Red   << 16)
              | (color.Green <<  8)
              | (color.Blue  <<  0);

examples/img2webp.c

@@ -0,0 +1,300 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  generate an animated WebP out of a sequence of images
+//  (PNG, JPEG, ...)
+//
+//  Example usage:
+//     img2webp -o out.webp -q 40 -mixed -duration 40 input??.png
+//
+// Author: skal@google.com (Pascal Massimino)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifdef HAVE_CONFIG_H
+#include "webp/config.h"
+#endif
+
+#include "../examples/example_util.h"
+#include "../imageio/image_dec.h"
+#include "../imageio/imageio_util.h"
+#include "./stopwatch.h"
+#include "webp/encode.h"
+#include "webp/mux.h"
+
+//------------------------------------------------------------------------------
+
+static void Help(void) {
+  printf("Usage:\n\n");
+  printf("  img2webp [file-level options] [image files...] "
+         "[per-frame options...]\n");
+  printf("\n");
+
+  printf("File-level options (only used at the start of compression):\n");
+  printf(" -min_size ............ minimize size\n");
+  printf(" -loop <int> .......... loop count (default: 0, = infinite loop)\n");
+  printf(" -kmax <int> .......... maximum number of frame between key-frames\n"
+         "                        (0=only keyframes)\n");
+  printf(" -kmin <int> .......... minimum number of frame between key-frames\n"
+         "                        (0=disable key-frames altogether)\n");
+  printf(" -mixed ............... use mixed lossy/lossless automatic mode\n");
+  printf(" -v ................... verbose mode\n");
+  printf(" -h ................... this help\n");
+  printf("\n");
+
+  printf("Per-frame options (only used for subsequent images input):\n");
+  printf(" -d <int> ............. frame duration in ms (default: 100)\n");
+  printf(" -lossless  ........... use lossless mode (default)\n");
+  printf(" -lossy ... ........... use lossy mode\n");
+  printf(" -q <float> ........... quality\n");
+  printf(" -m <int> ............. method to use\n");
+
+  printf("\n");
+  printf("example: img2webp -loop 2 in0.png -lossy in1.jpg\n"
+         "                  -d 80 in2.tiff -o out.webp\n");
+}
+
+//------------------------------------------------------------------------------
+
+static int ReadImage(const char filename[], WebPPicture* const pic) {
+  const uint8_t* data = NULL;
+  size_t data_size = 0;
+  WebPImageReader reader;
+  int ok;
+#ifdef HAVE_WINCODEC_H
+  // Try to decode the file using WIC falling back to the other readers for
+  // e.g., WebP.
+  ok = ReadPictureWithWIC(filename, pic, 1, NULL);
+  if (ok) return 1;
+#endif
+  if (!ImgIoUtilReadFile(filename, &data, &data_size)) return 0;
+  reader = WebPGuessImageReader(data, data_size);
+  ok = reader(data, data_size, pic, 1, NULL);
+  free((void*)data);
+  return ok;
+}
+
+static int SetLoopCount(int loop_count, WebPData* const webp_data) {
+  int ok = 1;
+  WebPMuxError err;
+  uint32_t features;
+  WebPMuxAnimParams new_params;
+  WebPMux* const mux = WebPMuxCreate(webp_data, 1);
+  if (mux == NULL) return 0;
+
+  err = WebPMuxGetFeatures(mux, &features);
+  ok = (err == WEBP_MUX_OK);
+  if (!ok || !(features & ANIMATION_FLAG)) goto End;
+
+  err = WebPMuxGetAnimationParams(mux, &new_params);
+  ok = (err == WEBP_MUX_OK);
+  if (ok) {
+    new_params.loop_count = loop_count;
+    err = WebPMuxSetAnimationParams(mux, &new_params);
+    ok = (err == WEBP_MUX_OK);
+  }
+  if (ok) {
+    WebPDataClear(webp_data);
+    err = WebPMuxAssemble(mux, webp_data);
+    ok = (err == WEBP_MUX_OK);
+  }
+
+ End:
+  WebPMuxDelete(mux);
+  if (!ok) {
+    fprintf(stderr, "Error during loop-count setting\n");
+  }
+  return ok;
+}
+
+//------------------------------------------------------------------------------
+
+int main(int argc, char* argv[]) {
+  const char* output = NULL;
+  WebPAnimEncoder* enc = NULL;
+  int verbose = 0;
+  int pic_num = 0;
+  int duration = 100;
+  int timestamp_ms = 0;
+  int ok = 1;
+  int loop_count = 0;
+  int width = 0, height = 0;
+  WebPAnimEncoderOptions anim_config;
+  WebPConfig config;
+  WebPPicture pic;
+  WebPData webp_data;
+  int c;
+  int have_input = 0;
+
+  WebPDataInit(&webp_data);
+  if (!WebPAnimEncoderOptionsInit(&anim_config) ||
+      !WebPConfigInit(&config) ||
+      !WebPPictureInit(&pic)) {
+    fprintf(stderr, "Library version mismatch!\n");
+    return 1;
+  }
+
+  // 1st pass of option parsing
+  for (c = 1; ok && c < argc; ++c) {
+    if (argv[c][0] == '-') {
+      int parse_error = 0;
+      if (!strcmp(argv[c], "-o") && c + 1 < argc) {
+        argv[c] = NULL;
+        output = argv[++c];
+      } else if (!strcmp(argv[c], "-kmin") && c + 1 < argc) {
+        argv[c] = NULL;
+        anim_config.kmin = ExUtilGetInt(argv[++c], 0, &parse_error);
+      } else if (!strcmp(argv[c], "-kmax") && c + 1 < argc) {
+        argv[c] = NULL;
+        anim_config.kmax = ExUtilGetInt(argv[++c], 0, &parse_error);
+      } else if (!strcmp(argv[c], "-loop") && c + 1 < argc) {
+        argv[c] = NULL;
+        loop_count = ExUtilGetInt(argv[++c], 0, &parse_error);
+        if (loop_count < 0) {
+          fprintf(stderr, "Invalid non-positive loop-count (%d)\n", loop_count);
+          parse_error = 1;
+        }
+      } else if (!strcmp(argv[c], "-min_size")) {
+        anim_config.minimize_size = 1;
+      } else if (!strcmp(argv[c], "-mixed")) {
+        anim_config.allow_mixed = 1;
+        config.lossless = 0;
+      } else if (!strcmp(argv[c], "-v")) {
+        verbose = 1;
+      } else if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
+        Help();
+        return 0;
+      } else {
+        continue;
+      }
+      ok = !parse_error;
+      if (!ok) goto End;
+      argv[c] = NULL;   // mark option as 'parsed' during 1st pass
+    } else {
+      have_input |= 1;
+    }
+  }
+  if (!have_input) {
+    fprintf(stderr, "No input file(s) for generating animation!\n");
+    return 0;
+  }
+
+  // image-reading pass
+  pic_num = 0;
+  config.lossless = 1;
+  for (c = 1; ok && c < argc; ++c) {
+    if (argv[c] == NULL) continue;
+    if (argv[c][0] == '-') {    // parse local options
+      int parse_error = 0;
+      if (!strcmp(argv[c], "-lossy")) {
+        if (!anim_config.allow_mixed) config.lossless = 0;
+      } else if (!strcmp(argv[c], "-lossless")) {
+        if (!anim_config.allow_mixed) config.lossless = 1;
+      } else if (!strcmp(argv[c], "-q") && c + 1 < argc) {
+        config.quality = ExUtilGetFloat(argv[++c], &parse_error);
+      } else if (!strcmp(argv[c], "-m") && c + 1 < argc) {
+        config.method = ExUtilGetInt(argv[++c], 0, &parse_error);
+      } else if (!strcmp(argv[c], "-d") && c + 1 < argc) {
+        duration = ExUtilGetInt(argv[++c], 0, &parse_error);
+        if (duration <= 0) {
+          fprintf(stderr, "Invalid negative duration (%d)\n", duration);
+          parse_error = 1;
+        }
+      } else {
+        parse_error = 1;   // shouldn't be here.
+        fprintf(stderr, "Unknown option [%s]\n", argv[c]);
+      }
+      ok = !parse_error;
+      if (!ok) goto End;
+      continue;
+    }
+
+    if (ok) {
+      ok = WebPValidateConfig(&config);
+      if (!ok) {
+        fprintf(stderr, "Invalid configuration.\n");
+        goto End;
+      }
+    }
+
+    // read next input image
+    pic.use_argb = 1;
+    ok = ReadImage(argv[c], &pic);
+    if (!ok) goto End;
+
+    if (enc == NULL) {
+      width  = pic.width;
+      height = pic.height;
+      enc = WebPAnimEncoderNew(width, height, &anim_config);
+      ok = (enc != NULL);
+      if (!ok) {
+        fprintf(stderr, "Could not create WebPAnimEncoder object.\n");
+      }
+    }
+
+    if (ok) {
+      ok = (width == pic.width && height == pic.height);
+      if (!ok) {
+        fprintf(stderr, "Frame #%d dimension mismatched! "
+                        "Got %d x %d. Was expecting %d x %d.\n",
+                pic_num, pic.width, pic.height, width, height);
+      }
+    }
+
+    if (ok) {
+      ok = WebPAnimEncoderAdd(enc, &pic, timestamp_ms, &config);
+      if (!ok) {
+        fprintf(stderr, "Error while adding frame #%d\n", pic_num);
+      }
+    }
+    WebPPictureFree(&pic);
+    if (!ok) goto End;
+
+    if (verbose) {
+      fprintf(stderr, "Added frame #%3d at time %4d (file: %s)\n",
+              pic_num, timestamp_ms, argv[c]);
+    }
+    timestamp_ms += duration;
+    ++pic_num;
+  }
+
+  // add a last fake frame to signal the last duration
+  ok = ok && WebPAnimEncoderAdd(enc, NULL, timestamp_ms, NULL);
+  ok = ok && WebPAnimEncoderAssemble(enc, &webp_data);
+  if (!ok) {
+    fprintf(stderr, "Error during final animation assembly.\n");
+  }
+
+ End:
+  // free resources
+  WebPAnimEncoderDelete(enc);
+
+  if (ok && loop_count > 0) {  // Re-mux to add loop count.
+    ok = SetLoopCount(loop_count, &webp_data);
+  }
+
+  if (ok) {
+    if (output != NULL) {
+      ok = ImgIoUtilWriteFile(output, webp_data.bytes, webp_data.size);
+      if (ok) fprintf(stderr, "output file: %s     ", output);
+    } else {
+      fprintf(stderr, "[no output file specified]   ");
+    }
+  }
+
+  if (ok) {
+    fprintf(stderr, "[%d frames, %u bytes].\n",
+            pic_num, (unsigned int)webp_data.size);
+  }
+
+  WebPDataClear(&webp_data);
+  return ok ? 0 : 1;
+}

examples/vwebp.c

@@ -40,7 +40,8 @@
 #include "webp/decode.h"
 #include "webp/demux.h"
 
-#include "./example_util.h"
+#include "../examples/example_util.h"
+#include "../imageio/imageio_util.h"
 
 #if defined(_MSC_VER) && _MSC_VER < 1900
 #define snprintf _snprintf
@@ -53,6 +54,7 @@ static struct {
   int done;
   int decoding_error;
   int print_info;
+  int only_deltas;
   int use_color_profile;
 
   int canvas_width, canvas_height;
@@ -251,6 +253,9 @@ static void HandleKey(unsigned char key, int pos_x, int pos_y) {
     // more involved though (need to save the previous frame).
     if (!kParams.has_animation) ClearPreviousFrame();
     glutPostRedisplay();
+  } else if (key == 'd') {
+    kParams.only_deltas = 1 - kParams.only_deltas;
+    glutPostRedisplay();
   }
 }
 
@@ -314,7 +319,9 @@ static void HandleDisplay(void) {
   glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
   glPixelStorei(GL_UNPACK_ROW_LENGTH, pic->u.RGBA.stride / 4);
 
-  if (prev->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ||
+  if (kParams.only_deltas) {
+    DrawCheckerBoard();
+  } else if (prev->dispose_method == WEBP_MUX_DISPOSE_BACKGROUND ||
       curr->blend_method == WEBP_MUX_NO_BLEND) {
     // glScissor() takes window coordinates (0,0 at bottom left).
     int window_x, window_y;
@@ -371,13 +378,13 @@ static void HandleDisplay(void) {
     }
   }
   glPopMatrix();
-  glFlush();
+  glutSwapBuffers();
 }
 
 static void StartDisplay(void) {
   const int width = kParams.canvas_width;
   const int height = kParams.canvas_height;
-  glutInitDisplayMode(GLUT_RGBA);
+  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
   glutInitWindowSize(width, height);
   glutCreateWindow("WebP viewer");
   glutDisplayFunc(HandleDisplay);
@@ -414,6 +421,7 @@ static void Help(void) {
          "Keyboard shortcuts:\n"
          "  'c' ................ toggle use of color profile\n"
          "  'i' ................ overlay file information\n"
+         "  'd' ................ disable blending & disposal (debug)\n"
          "  'q' / 'Q' / ESC .... quit\n"
         );
 }
@@ -482,8 +490,8 @@ int main(int argc, char *argv[]) {
     return 0;
   }
 
-  if (!ExUtilReadFile(kParams.file_name,
-                      &kParams.data.bytes, &kParams.data.size)) {
+  if (!ImgIoUtilReadFile(kParams.file_name,
+                         &kParams.data.bytes, &kParams.data.size)) {
     goto Error;
   }
 
@@ -498,10 +506,6 @@ int main(int argc, char *argv[]) {
     goto Error;
   }
 
-  if (WebPDemuxGetI(kParams.dmux, WEBP_FF_FORMAT_FLAGS) & FRAGMENTS_FLAG) {
-    fprintf(stderr, "Image fragments are not supported for now!\n");
-    goto Error;
-  }
   kParams.canvas_width = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_WIDTH);
   kParams.canvas_height = WebPDemuxGetI(kParams.dmux, WEBP_FF_CANVAS_HEIGHT);
   if (kParams.print_info) {

examples/webpdec.c

@@ -1,95 +0,0 @@
-// Copyright 2014 Google Inc. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the COPYING file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS. All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-// -----------------------------------------------------------------------------
-//
-// WebP decode.
-
-#include "./webpdec.h"
-
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "webp/decode.h"
-#include "webp/encode.h"
-#include "./example_util.h"
-#include "./metadata.h"
-
-int ReadWebP(const uint8_t* const data, size_t data_size,
-             WebPPicture* const pic,
-             int keep_alpha, Metadata* const metadata) {
-  int ok = 0;
-  VP8StatusCode status = VP8_STATUS_OK;
-  WebPDecoderConfig config;
-  WebPDecBuffer* const output_buffer = &config.output;
-  WebPBitstreamFeatures* const bitstream = &config.input;
-
-  // TODO(jzern): add Exif/XMP/ICC extraction.
-  if (metadata != NULL) {
-    fprintf(stderr, "Warning: metadata extraction from WebP is unsupported.\n");
-  }
-
-  if (!WebPInitDecoderConfig(&config)) {
-    fprintf(stderr, "Library version mismatch!\n");
-    return 0;
-  }
-
-  status = WebPGetFeatures(data, data_size, bitstream);
-  if (status != VP8_STATUS_OK) {
-    ExUtilPrintWebPError("input data", status);
-    return 0;
-  }
-  {
-    const int has_alpha = keep_alpha && bitstream->has_alpha;
-    if (pic->use_argb) {
-      output_buffer->colorspace = has_alpha ? MODE_RGBA : MODE_RGB;
-    } else {
-      output_buffer->colorspace = has_alpha ? MODE_YUVA : MODE_YUV;
-    }
-
-    status = ExUtilDecodeWebP(data, data_size, 0, &config);
-    if (status == VP8_STATUS_OK) {
-      pic->width = output_buffer->width;
-      pic->height = output_buffer->height;
-      if (pic->use_argb) {
-        const uint8_t* const rgba = output_buffer->u.RGBA.rgba;
-        const int stride = output_buffer->u.RGBA.stride;
-        ok = has_alpha ? WebPPictureImportRGBA(pic, rgba, stride)
-                       : WebPPictureImportRGB(pic, rgba, stride);
-      } else {
-        pic->colorspace = has_alpha ? WEBP_YUV420A : WEBP_YUV420;
-        ok = WebPPictureAlloc(pic);
-        if (!ok) {
-          status = VP8_STATUS_OUT_OF_MEMORY;
-        } else {
-          const WebPYUVABuffer* const yuva = &output_buffer->u.YUVA;
-          const int uv_width = (pic->width + 1) >> 1;
-          const int uv_height = (pic->height + 1) >> 1;
-          ExUtilCopyPlane(yuva->y, yuva->y_stride,
-                          pic->y, pic->y_stride, pic->width, pic->height);
-          ExUtilCopyPlane(yuva->u, yuva->u_stride,
-                          pic->u, pic->uv_stride, uv_width, uv_height);
-          ExUtilCopyPlane(yuva->v, yuva->v_stride,
-                          pic->v, pic->uv_stride, uv_width, uv_height);
-          if (has_alpha) {
-            ExUtilCopyPlane(yuva->a, yuva->a_stride,
-                            pic->a, pic->a_stride, pic->width, pic->height);
-          }
-        }
-      }
-    }
-  }
-
-  if (status != VP8_STATUS_OK) {
-    ExUtilPrintWebPError("input data", status);
-  }
-
-  WebPFreeDecBuffer(output_buffer);
-  return ok;
-}
-
-// -----------------------------------------------------------------------------

examples/webpdec.h

@@ -1,37 +0,0 @@
-// Copyright 2014 Google Inc. All Rights Reserved.
-//
-// Use of this source code is governed by a BSD-style license
-// that can be found in the COPYING file in the root of the source
-// tree. An additional intellectual property rights grant can be found
-// in the file PATENTS. All contributing project authors may
-// be found in the AUTHORS file in the root of the source tree.
-// -----------------------------------------------------------------------------
-//
-// WebP decode.
-
-#ifndef WEBP_EXAMPLES_WEBPDEC_H_
-#define WEBP_EXAMPLES_WEBPDEC_H_
-
-#include "webp/types.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct Metadata;
-struct WebPPicture;
-
-// Reads a WebP from 'in_file', returning the decoded output in 'pic'.
-// Output is RGBA or YUVA, depending on pic->use_argb value.
-// If 'keep_alpha' is true and the WebP has an alpha channel, the output is RGBA
-// or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.
-// Returns true on success.
-int ReadWebP(const uint8_t* const data, size_t data_size,
-             struct WebPPicture* const pic,
-             int keep_alpha, struct Metadata* const metadata);
-
-#ifdef __cplusplus
-}    // extern "C"
-#endif
-
-#endif  // WEBP_EXAMPLES_WEBPDEC_H_

examples/webpmux.c

@@ -28,7 +28,6 @@
     webpmux -set xmp image_metadata.xmp in.webp -o out_xmp_container.webp
 
   Extract relevant data from WebP container file:
-    webpmux -get frgm n in.webp -o out_fragment.webp
     webpmux -get frame n in.webp -o out_frame.webp
     webpmux -get icc in.webp -o image_profile.icc
     webpmux -get exif in.webp -o image_metadata.exif
@@ -39,6 +38,11 @@
     webpmux -strip exif in.webp -o out.webp
     webpmux -strip xmp in.webp -o out.webp
 
+  Change duration of frame intervals:
+    webpmux -duration 150 in.webp -o out.webp
+    webpmux -duration 33,2 in.webp -o out.webp
+    webpmux -duration 200,10,0 -duration 150,6,50 in.webp -o out.webp
+
   Misc:
     webpmux -info in.webp
     webpmux [ -h | -help ]
@@ -55,7 +59,8 @@
 #include <string.h>
 #include "webp/decode.h"
 #include "webp/mux.h"
-#include "./example_util.h"
+#include "../examples/example_util.h"
+#include "../imageio/imageio_util.h"
 
 //------------------------------------------------------------------------------
 // Config object to parse command-line arguments.
@@ -66,7 +71,8 @@ typedef enum {
   ACTION_SET,
   ACTION_STRIP,
   ACTION_INFO,
-  ACTION_HELP
+  ACTION_HELP,
+  ACTION_DURATION
 } ActionType;
 
 typedef enum {
@@ -88,17 +94,17 @@ typedef enum {
   FEATURE_XMP,
   FEATURE_ICCP,
   FEATURE_ANMF,
-  FEATURE_FRGM,
+  FEATURE_DURATION,
   LAST_FEATURE
 } FeatureType;
 
 static const char* const kFourccList[LAST_FEATURE] = {
-  NULL, "EXIF", "XMP ", "ICCP", "ANMF", "FRGM"
+  NULL, "EXIF", "XMP ", "ICCP", "ANMF"
 };
 
 static const char* const kDescriptions[LAST_FEATURE] = {
   NULL, "EXIF metadata", "XMP metadata", "ICC profile",
-  "Animation frame", "Image fragment"
+  "Animation frame"
 };
 
 typedef struct {
@@ -182,7 +188,6 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
   printf("Canvas size: %d x %d\n", width, height);
 
   err = WebPMuxGetFeatures(mux, &flag);
-  if (flag & FRAGMENTS_FLAG) err = WEBP_MUX_INVALID_ARGUMENT;
   RETURN_IF_ERROR("Failed to retrieve features\n");
 
   if (flag == 0) {
@@ -193,26 +198,22 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
   // Print the features present.
   printf("Features present:");
   if (flag & ANIMATION_FLAG) printf(" animation");
-  if (flag & FRAGMENTS_FLAG) printf(" image fragments");
   if (flag & ICCP_FLAG)      printf(" ICC profile");
   if (flag & EXIF_FLAG)      printf(" EXIF metadata");
   if (flag & XMP_FLAG)       printf(" XMP metadata");
   if (flag & ALPHA_FLAG)     printf(" transparency");
   printf("\n");
 
-  if ((flag & ANIMATION_FLAG) || (flag & FRAGMENTS_FLAG)) {
-    const int is_anim = !!(flag & ANIMATION_FLAG);
-    const WebPChunkId id = is_anim ? WEBP_CHUNK_ANMF : WEBP_CHUNK_FRGM;
-    const char* const type_str = is_anim ? "frame" : "fragment";
+  if (flag & ANIMATION_FLAG) {
+    const WebPChunkId id = WEBP_CHUNK_ANMF;
+    const char* const type_str = "frame";
     int nFrames;
 
-    if (is_anim) {
-      WebPMuxAnimParams params;
-      err = WebPMuxGetAnimationParams(mux, &params);
-      assert(err == WEBP_MUX_OK);
-      printf("Background color : 0x%.8X  Loop Count : %d\n",
-             params.bgcolor, params.loop_count);
-    }
+    WebPMuxAnimParams params;
+    err = WebPMuxGetAnimationParams(mux, &params);
+    assert(err == WEBP_MUX_OK);
+    printf("Background color : 0x%.8X  Loop Count : %d\n",
+           params.bgcolor, params.loop_count);
 
     err = WebPMuxNumChunks(mux, id, &nFrames);
     assert(err == WEBP_MUX_OK);
@@ -221,8 +222,8 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
     if (nFrames > 0) {
       int i;
       printf("No.: width height alpha x_offset y_offset ");
-      if (is_anim) printf("duration   dispose blend ");
-      printf("image_size\n");
+      printf("duration   dispose blend ");
+      printf("image_size  compression\n");
       for (i = 1; i <= nFrames; i++) {
         WebPMuxFrameInfo frame;
         err = WebPMuxGetFrame(mux, i, &frame);
@@ -235,7 +236,7 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
           printf("%3d: %5d %5d %5s %8d %8d ", i, features.width,
                  features.height, features.has_alpha ? "yes" : "no",
                  frame.x_offset, frame.y_offset);
-          if (is_anim) {
+          {
             const char* const dispose =
                 (frame.dispose_method == WEBP_MUX_DISPOSE_NONE) ? "none"
                                                                 : "background";
@@ -243,7 +244,10 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
                 (frame.blend_method == WEBP_MUX_BLEND) ? "yes" : "no";
             printf("%8d %10s %5s ", frame.duration, dispose, blend);
           }
-          printf("%10d\n", (int)frame.bitstream.size);
+          printf("%10d %11s\n", (int)frame.bitstream.size,
+                 (features.format == 1) ? "lossy" :
+                 (features.format == 2) ? "lossless" :
+                                          "undefined");
         }
         WebPDataClear(&frame.bitstream);
         RETURN_IF_ERROR3("Failed to retrieve %s#%d\n", type_str, i);
@@ -272,7 +276,7 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
     printf("Size of the XMP metadata: %d\n", (int)xmp.size);
   }
 
-  if ((flag & ALPHA_FLAG) && !(flag & (ANIMATION_FLAG | FRAGMENTS_FLAG))) {
+  if ((flag & ALPHA_FLAG) && !(flag & ANIMATION_FLAG)) {
     WebPMuxFrameInfo image;
     err = WebPMuxGetFrame(mux, 1, &image);
     if (err == WEBP_MUX_OK) {
@@ -288,6 +292,8 @@ static WebPMuxError DisplayInfo(const WebPMux* mux) {
 static void PrintHelp(void) {
   printf("Usage: webpmux -get GET_OPTIONS INPUT -o OUTPUT\n");
   printf("       webpmux -set SET_OPTIONS INPUT -o OUTPUT\n");
+  printf("       webpmux -duration DURATION_OPTIONS [-duration ...]\n");
+  printf("               INPUT -o OUTPUT\n");
   printf("       webpmux -strip STRIP_OPTIONS INPUT -o OUTPUT\n");
   printf("       webpmux -frame FRAME_OPTIONS [-frame...] [-loop LOOP_COUNT]"
          "\n");
@@ -314,6 +320,18 @@ static void PrintHelp(void) {
   printf("             'file.exif' contains the EXIF metadata to be set\n");
   printf("             'file.xmp' contains the XMP metadata to be set\n");
 
+  printf("\n");
+  printf("DURATION_OPTIONS:\n");
+  printf(" Set duration of selected frames:\n");
+  printf("   duration            set duration for each frames\n");
+  printf("   duration,frame      set duration of a particular frame\n");
+  printf("   duration,start,end  set duration of frames in the\n");
+  printf("                        interval [start,end])\n");
+  printf("   where: 'duration' is the duration in milliseconds\n");
+  printf("          'start' is the start frame index\n");
+  printf("          'end' is the inclusive end frame index\n");
+  printf("           The special 'end' value '0' means: last frame.\n");
+
   printf("\n");
   printf("STRIP_OPTIONS:\n");
   printf(" Strip color profile/metadata:\n");
@@ -365,7 +383,7 @@ static int ReadFileToWebPData(const char* const filename,
                               WebPData* const webp_data) {
   const uint8_t* data;
   size_t size;
-  if (!ExUtilReadFile(filename, &data, &size)) return 0;
+  if (!ImgIoUtilReadFile(filename, &data, &size)) return 0;
   webp_data->bytes = data;
   webp_data->size = size;
   return 1;
@@ -385,7 +403,7 @@ static int CreateMux(const char* const filename, WebPMux** mux) {
 static int WriteData(const char* filename, const WebPData* const webpdata) {
   int ok = 0;
   FILE* fout = strcmp(filename, "-") ? fopen(filename, "wb")
-                                     : ExUtilSetBinaryMode(stdout);
+                                     : ImgIoUtilSetBinaryMode(stdout);
   if (fout == NULL) {
     fprintf(stderr, "Error opening output WebP file %s!\n", filename);
     return 0;
@@ -414,6 +432,45 @@ static int WriteWebP(WebPMux* const mux, const char* filename) {
   return ok;
 }
 
+static WebPMux* DuplicateMuxHeader(const WebPMux* const mux) {
+  WebPMux* new_mux = WebPMuxNew();
+  WebPMuxAnimParams p;
+  WebPMuxError err;
+  int i;
+  int ok = 1;
+
+  if (new_mux == NULL) return NULL;
+
+  err = WebPMuxGetAnimationParams(mux, &p);
+  if (err == WEBP_MUX_OK) {
+    err = WebPMuxSetAnimationParams(new_mux, &p);
+    if (err != WEBP_MUX_OK) {
+      ERROR_GOTO2("Error (%s) handling animation params.\n",
+                  ErrorString(err), End);
+    }
+  } else {
+    /* it might not be an animation. Just keep moving. */
+  }
+
+  for (i = 1; i <= 3; ++i) {
+    WebPData metadata;
+    err = WebPMuxGetChunk(mux, kFourccList[i], &metadata);
+    if (err == WEBP_MUX_OK && metadata.size > 0) {
+      err = WebPMuxSetChunk(new_mux, kFourccList[i], &metadata, 1);
+      if (err != WEBP_MUX_OK) {
+        ERROR_GOTO1("Error transferring metadata in DuplicateMux().", End);
+      }
+    }
+  }
+
+ End:
+  if (!ok) {
+    WebPMuxDelete(new_mux);
+    new_mux = NULL;
+  }
+  return new_mux;
+}
+
 static int ParseFrameArgs(const char* args, WebPMuxFrameInfo* const info) {
   int dispose_method, dummy;
   char plus_minus, blend_method;
@@ -449,13 +506,6 @@ static int ParseFrameArgs(const char* args, WebPMuxFrameInfo* const info) {
   return 1;
 }
 
-static int ParseFragmentArgs(const char* args, WebPMuxFrameInfo* const info) {
-  const int ok =
-      (sscanf(args, "+%d+%d", &info->x_offset, &info->y_offset) == 2);
-  if (ok) WarnAboutOddOffset(info);
-  return ok;
-}
-
 static int ParseBgcolorArgs(const char* args, uint32_t* const bgcolor) {
   uint32_t a, r, g, b;
   if (sscanf(args, "%u,%u,%u,%u", &a, &r, &g, &b) != 4) return 0;
@@ -484,9 +534,9 @@ static void DeleteConfig(WebPMuxConfig* config) {
 static int ValidateCommandLine(int argc, const char* argv[],
                                int* num_feature_args) {
   int num_frame_args;
-  int num_frgm_args;
   int num_loop_args;
   int num_bgcolor_args;
+  int num_durations_args;
   int ok = 1;
 
   assert(num_feature_args != NULL);
@@ -511,9 +561,9 @@ static int ValidateCommandLine(int argc, const char* argv[],
 
   // Compound checks.
   num_frame_args = CountOccurrences(argv, argc, "-frame");
-  num_frgm_args = CountOccurrences(argv, argc, "-frgm");
   num_loop_args = CountOccurrences(argv, argc, "-loop");
   num_bgcolor_args = CountOccurrences(argv, argc, "-bgcolor");
+  num_durations_args = CountOccurrences(argv, argc, "-duration");
 
   if (num_loop_args > 1) {
     ERROR_GOTO1("ERROR: Multiple loop counts specified.\n", ErrValidate);
@@ -526,22 +576,20 @@ static int ValidateCommandLine(int argc, const char* argv[],
     ERROR_GOTO1("ERROR: Loop count and background color are relevant only in "
                 "case of animation.\n", ErrValidate);
   }
-  if (num_frame_args > 0 && num_frgm_args > 0) {
-    ERROR_GOTO1("ERROR: Only one of frames & fragments can be specified at a "
-                "time.\n", ErrValidate);
+  if (num_durations_args > 0 && num_frame_args != 0) {
+    ERROR_GOTO1("ERROR: Can not combine -duration and -frame commands.\n",
+                ErrValidate);
   }
 
   assert(ok == 1);
-  if (num_frame_args == 0 && num_frgm_args == 0) {
+  if (num_durations_args > 0) {
+    *num_feature_args = num_durations_args;
+  } else if (num_frame_args == 0) {
     // Single argument ('set' action for ICCP/EXIF/XMP, OR a 'get' action).
     *num_feature_args = 1;
   } else {
-    // Multiple arguments ('set' action for animation or fragmented image).
-    if (num_frame_args > 0) {
-      *num_feature_args = num_frame_args + num_loop_args + num_bgcolor_args;
-    } else {
-      *num_feature_args = num_frgm_args;
-    }
+    // Multiple arguments ('set' action for animation)
+    *num_feature_args = num_frame_args + num_loop_args + num_bgcolor_args;
   }
 
  ErrValidate:
@@ -583,6 +631,21 @@ static int ParseCommandLine(int argc, const char* argv[],
           ERROR_GOTO1("ERROR: Multiple actions specified.\n", ErrParse);
         }
         ++i;
+      } else if (!strcmp(argv[i], "-duration")) {
+        CHECK_NUM_ARGS_LESS(2, ErrParse);
+        if (ACTION_IS_NIL || config->action_type_ == ACTION_DURATION) {
+          config->action_type_ = ACTION_DURATION;
+        } else {
+          ERROR_GOTO1("ERROR: Multiple actions specified.\n", ErrParse);
+        }
+        if (FEATURETYPE_IS_NIL || feature->type_ == FEATURE_DURATION) {
+          feature->type_ = FEATURE_DURATION;
+        } else {
+          ERROR_GOTO1("ERROR: Multiple features specified.\n", ErrParse);
+        }
+        arg->params_ = argv[i + 1];
+        ++feature_arg_index;
+        i += 2;
       } else if (!strcmp(argv[i], "-get")) {
         if (ACTION_IS_NIL) {
           config->action_type_ = ACTION_GET;
@@ -694,8 +757,7 @@ static int ParseCommandLine(int argc, const char* argv[],
       } else if (!strcmp(argv[i], "frame") &&
                  (config->action_type_ == ACTION_GET)) {
         CHECK_NUM_ARGS_LESS(2, ErrParse);
-        feature->type_ = (!strcmp(argv[i], "frame")) ? FEATURE_ANMF :
-            FEATURE_FRGM;
+        feature->type_ = FEATURE_ANMF;
         arg->params_ = argv[i + 1];
         ++feature_arg_index;
         i += 2;
@@ -733,8 +795,7 @@ static int ValidateConfig(WebPMuxConfig* config) {
   if (config->input_ == NULL) {
     if (config->action_type_ != ACTION_SET) {
       ERROR_GOTO1("ERROR: No input file specified.\n", ErrValidate2);
-    } else if (feature->type_ != FEATURE_ANMF &&
-               feature->type_ != FEATURE_FRGM) {
+    } else if (feature->type_ != FEATURE_ANMF) {
       ERROR_GOTO1("ERROR: No input file specified.\n", ErrValidate2);
     }
   }
@@ -786,14 +847,13 @@ static int InitializeConfig(int argc, const char* argv[],
 //------------------------------------------------------------------------------
 // Processing.
 
-static int GetFrameFragment(const WebPMux* mux,
-                            const WebPMuxConfig* config, int is_frame) {
+static int GetFrame(const WebPMux* mux, const WebPMuxConfig* config) {
   WebPMuxError err = WEBP_MUX_OK;
   WebPMux* mux_single = NULL;
   int num = 0;
   int ok = 1;
   int parse_error = 0;
-  const WebPChunkId id = is_frame ? WEBP_CHUNK_ANMF : WEBP_CHUNK_FRGM;
+  const WebPChunkId id = WEBP_CHUNK_ANMF;
   WebPMuxFrameInfo info;
   WebPDataInit(&info.bitstream);
 
@@ -844,9 +904,7 @@ static int Process(const WebPMuxConfig* config) {
       if (!ok) goto Err2;
       switch (feature->type_) {
         case FEATURE_ANMF:
-        case FEATURE_FRGM:
-          ok = GetFrameFragment(mux, config,
-                                (feature->type_ == FEATURE_ANMF) ? 1 : 0);
+          ok = GetFrame(mux, config);
           break;
 
         case FEATURE_ICCP:
@@ -938,35 +996,6 @@ static int Process(const WebPMuxConfig* config) {
           break;
         }
 
-        case FEATURE_FRGM: {
-          int i;
-          mux = WebPMuxNew();
-          if (mux == NULL) {
-            ERROR_GOTO2("ERROR (%s): Could not allocate a mux object.\n",
-                        ErrorString(WEBP_MUX_MEMORY_ERROR), Err2);
-          }
-          for (i = 0; i < feature->arg_count_; ++i) {
-            WebPMuxFrameInfo frgm;
-            frgm.id = WEBP_CHUNK_FRGM;
-            ok = ReadFileToWebPData(feature->args_[i].filename_,
-                                    &frgm.bitstream);
-            if (!ok) goto Err2;
-            ok = ParseFragmentArgs(feature->args_[i].params_, &frgm);
-            if (!ok) {
-              WebPDataClear(&frgm.bitstream);
-              ERROR_GOTO1("ERROR: Could not parse fragment properties.\n",
-                          Err2);
-            }
-            err = WebPMuxPushFrame(mux, &frgm, 1);
-            WebPDataClear(&frgm.bitstream);
-            if (err != WEBP_MUX_OK) {
-              ERROR_GOTO3("ERROR (%s): Could not add a fragment at index %d.\n",
-                          ErrorString(err), i, Err2);
-            }
-          }
-          break;
-        }
-
         case FEATURE_ICCP:
         case FEATURE_EXIF:
         case FEATURE_XMP: {
@@ -990,6 +1019,89 @@ static int Process(const WebPMuxConfig* config) {
       ok = WriteWebP(mux, config->output_);
       break;
     }
+    case ACTION_DURATION: {
+      int num_frames;
+      ok = CreateMux(config->input_, &mux);
+      if (!ok) goto Err2;
+      err = WebPMuxNumChunks(mux, WEBP_CHUNK_ANMF, &num_frames);
+      ok = (err == WEBP_MUX_OK);
+      if (!ok) {
+        ERROR_GOTO1("ERROR: can not parse the number of frames.\n", Err2);
+      }
+      if (num_frames == 0) {
+        fprintf(stderr, "Doesn't look like the source is animated. "
+                        "Skipping duration setting.\n");
+        ok = WriteWebP(mux, config->output_);
+        if (!ok) goto Err2;
+      } else {
+        int i;
+        int* durations = NULL;
+        WebPMux* new_mux = DuplicateMuxHeader(mux);
+        if (new_mux == NULL) goto Err2;
+        durations = (int*)malloc((size_t)num_frames * sizeof(*durations));
+        if (durations == NULL) goto Err2;
+        for (i = 0; i < num_frames; ++i) durations[i] = -1;
+
+        // Parse intervals to process.
+        for (i = 0; i < feature->arg_count_; ++i) {
+          int k;
+          int args[3];
+          int duration, start, end;
+          const int nb_args = ExUtilGetInts(feature->args_[i].params_,
+                                            10, 3, args);
+          ok = (nb_args >= 1);
+          if (!ok) goto Err3;
+          duration = args[0];
+          if (duration < 0) {
+            ERROR_GOTO1("ERROR: duration must be strictly positive.\n", Err3);
+          }
+
+          if (nb_args == 1) {   // only duration is present -> use full interval
+            start = 1;
+            end = num_frames;
+          } else {
+            start = args[1];
+            if (start <= 0) {
+              start = 1;
+            } else if (start > num_frames) {
+              start = num_frames;
+            }
+            end = (nb_args >= 3) ? args[2] : start;
+            if (end == 0 || end > num_frames) end = num_frames;
+          }
+
+          for (k = start; k <= end; ++k) {
+            assert(k >= 1 && k <= num_frames);
+            durations[k - 1] = duration;
+          }
+        }
+
+        // Apply non-negative durations to their destination frames.
+        for (i = 1; i <= num_frames; ++i) {
+          WebPMuxFrameInfo frame;
+          err = WebPMuxGetFrame(mux, i, &frame);
+          if (err != WEBP_MUX_OK || frame.id != WEBP_CHUNK_ANMF) {
+            ERROR_GOTO2("ERROR: can not retrieve frame #%d.\n", i, Err3);
+          }
+          if (durations[i - 1] >= 0) frame.duration = durations[i - 1];
+          err = WebPMuxPushFrame(new_mux, &frame, 1);
+          if (err != WEBP_MUX_OK) {
+            ERROR_GOTO2("ERROR: error push frame data #%d\n", i, Err3);
+          }
+          WebPDataClear(&frame.bitstream);
+        }
+        WebPMuxDelete(mux);
+        ok = WriteWebP(new_mux, config->output_);
+        mux = new_mux;  // transfer for the WebPMuxDelete() call
+        new_mux = NULL;
+
+ Err3:
+        free(durations);
+        WebPMuxDelete(new_mux);
+        if (!ok) goto Err2;
+      }
+      break;
+    }
     case ACTION_STRIP: {
       ok = CreateMux(config->input_, &mux);
       if (!ok) goto Err2;

extras/Makefile.am

@@ -0,0 +1,36 @@
+AM_CPPFLAGS += -I$(top_builddir)/src -I$(top_srcdir)/src
+noinst_LTLIBRARIES = libwebpextras.la
+
+noinst_HEADERS =
+noinst_HEADERS += ../src/webp/types.h
+
+libwebpextras_la_SOURCES =
+libwebpextras_la_SOURCES += extras.c extras.h quality_estimate.c
+
+libwebpextras_la_CPPFLAGS = $(AM_CPPFLAGS)
+libwebpextras_la_LDFLAGS = -lm
+libwebpextras_la_LIBADD = ../src/libwebp.la
+
+noinst_PROGRAMS =
+noinst_PROGRAMS += get_disto webp_quality
+if BUILD_VWEBP_SDL
+  noinst_PROGRAMS += vwebp_sdl
+endif
+
+get_disto_SOURCES  = get_disto.c
+get_disto_CPPFLAGS = $(AM_CPPFLAGS)
+get_disto_LDADD = ../imageio/libimageio_util.la ../imageio/libimagedec.la
+get_disto_LDADD += ../src/libwebp.la
+get_disto_LDADD += $(PNG_LIBS) $(JPEG_LIBS) $(TIFF_LIBS)
+
+webp_quality_SOURCES  = webp_quality.c
+webp_quality_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+webp_quality_LDADD  = ../imageio/libimageio_util.la
+webp_quality_LDADD += libwebpextras.la
+webp_quality_LDADD += ../src/libwebp.la
+
+vwebp_sdl_SOURCES  = vwebp_sdl.c webp_to_sdl.c webp_to_sdl.h
+vwebp_sdl_CPPFLAGS = $(AM_CPPFLAGS) $(SDL_INCLUDES)
+vwebp_sdl_LDADD = ../imageio/libimageio_util.la
+vwebp_sdl_LDADD += ../src/libwebp.la
+vwebp_sdl_LDADD += $(SDL_LIBS)

extras/extras.c

@@ -10,12 +10,14 @@
 //  Additional WebP utilities.
 //
 
-#include "../webp/extras.h"
+#include "./extras.h"
+#include "webp/format_constants.h"
 
+#include <assert.h>
 #include <string.h>
 
 #define XTRA_MAJ_VERSION 0
-#define XTRA_MIN_VERSION 0
+#define XTRA_MIN_VERSION 1
 #define XTRA_REV_VERSION 0
 
 //------------------------------------------------------------------------------
@@ -108,4 +110,33 @@ int WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic) {
   return 1;
 }
 
+int WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
+                              const uint32_t palette[], int palette_size,
+                              WebPPicture* pic) {
+  int x, y;
+  uint32_t* dst;
+  // 256 as the input buffer is uint8_t.
+  assert(MAX_PALETTE_SIZE <= 256);
+  if (pic == NULL || indexed == NULL || indexed_stride < pic->width ||
+      palette == NULL || palette_size > MAX_PALETTE_SIZE || palette_size <= 0) {
+    return 0;
+  }
+  pic->use_argb = 1;
+  if (!WebPPictureAlloc(pic)) return 0;
+  dst = pic->argb;
+  for (y = 0; y < pic->height; ++y) {
+    for (x = 0; x < pic->width; ++x) {
+      // Make sure we are within the palette.
+      if (indexed[x] >= palette_size) {
+        WebPPictureFree(pic);
+        return 0;
+      }
+      dst[x] = palette[indexed[x]];
+    }
+    indexed += indexed_stride;
+    dst += pic->argb_stride;
+  }
+  return 1;
+}
+
 //------------------------------------------------------------------------------

extras/extras.h

@@ -8,18 +8,18 @@
 // -----------------------------------------------------------------------------
 //
 
-#ifndef WEBP_WEBP_EXTRAS_H_
-#define WEBP_WEBP_EXTRAS_H_
+#ifndef WEBP_EXTRAS_EXTRAS_H_
+#define WEBP_EXTRAS_EXTRAS_H_
 
-#include "./types.h"
+#include "webp/types.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#include "./encode.h"
+#include "webp/encode.h"
 
-#define WEBP_EXTRAS_ABI_VERSION 0x0000    // MAJOR(8b) + MINOR(8b)
+#define WEBP_EXTRAS_ABI_VERSION 0x0001    // MAJOR(8b) + MINOR(8b)
 
 //------------------------------------------------------------------------------
 
@@ -42,10 +42,29 @@ WEBP_EXTERN(int) WebPImportRGB565(const uint8_t* rgb565, WebPPicture* pic);
 // width and height must be set prior to calling this function.
 WEBP_EXTERN(int) WebPImportRGB4444(const uint8_t* rgb4444, WebPPicture* pic);
 
+// Import a color mapped image. The number of colors is less or equal to
+// MAX_PALETTE_SIZE. 'pic' must have been initialized. Its content, if any,
+// will be discarded. Returns 'false' in case of error, or if indexed[] contains
+// invalid indices.
+WEBP_EXTERN(int)
+WebPImportColorMappedARGB(const uint8_t* indexed, int indexed_stride,
+                          const uint32_t palette[], int palette_size,
+                          WebPPicture* pic);
+
+//------------------------------------------------------------------------------
+
+// Parse a bitstream, search for VP8 (lossy) header and report a
+// rough estimation of the quality factor used for compressing the bitstream.
+// If the bitstream is in lossless format, the special value '101' is returned.
+// Otherwise (lossy bitstream), the returned value is in the range [0..100].
+// Any error (invalid bitstream, animated WebP, incomplete header, etc.)
+// will return a value of -1.
+WEBP_EXTERN(int) VP8EstimateQuality(const uint8_t* const data, size_t size);
+
 //------------------------------------------------------------------------------
 
 #ifdef __cplusplus
 }    // extern "C"
 #endif
 
-#endif  /* WEBP_WEBP_EXTRAS_H_ */
+#endif  /* WEBP_EXTRAS_EXTRAS_H_ */

extras/get_disto.c

@@ -0,0 +1,343 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Simple tool to load two webp/png/jpg/tiff files and compute PSNR/SSIM.
+// This is mostly a wrapper around WebPPictureDistortion().
+//
+/*
+ gcc -o get_disto get_disto.c -O3 -I../ -L../examples -L../imageio \
+    -lexample_util -limageio_util -limagedec -lwebp -L/opt/local/lib \
+    -lpng -lz -ljpeg -ltiff -lm -lpthread
+*/
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "webp/encode.h"
+#include "../imageio/image_dec.h"
+#include "../imageio/imageio_util.h"
+
+static size_t ReadPicture(const char* const filename, WebPPicture* const pic,
+                          int keep_alpha) {
+  const uint8_t* data = NULL;
+  size_t data_size = 0;
+  WebPImageReader reader = NULL;
+  int ok = ImgIoUtilReadFile(filename, &data, &data_size);
+  if (!ok) goto End;
+
+  pic->use_argb = 1;  // force ARGB
+
+#ifdef HAVE_WINCODEC_H
+  // Try to decode the file using WIC falling back to the other readers for
+  // e.g., WebP.
+  ok = ReadPictureWithWIC(filename, pic, keep_alpha, NULL);
+  if (ok) goto End;
+#endif
+  reader = WebPGuessImageReader(data, data_size);
+  ok = reader(data, data_size, pic, keep_alpha, NULL);
+
+ End:
+  if (!ok) {
+    fprintf(stderr, "Error! Could not process file %s\n", filename);
+  }
+  free((void*)data);
+  return ok ? data_size : 0;
+}
+
+static void RescalePlane(uint8_t* plane, int width, int height,
+                         int x_stride, int y_stride, int max) {
+  const uint32_t factor = (max > 0) ? (255u << 16) / max : 0;
+  int x, y;
+  for (y = 0; y < height; ++y) {
+    uint8_t* const ptr = plane + y * y_stride;
+    for (x = 0; x < width * x_stride; x += x_stride) {
+      const uint32_t diff = (ptr[x] * factor + (1 << 15)) >> 16;
+      ptr[x] = diff;
+    }
+  }
+}
+
+// Return the max absolute difference.
+static int DiffScaleChannel(uint8_t* src1, int stride1,
+                            const uint8_t* src2, int stride2,
+                            int x_stride, int w, int h, int do_scaling) {
+  int x, y;
+  int max = 0;
+  for (y = 0; y < h; ++y) {
+    uint8_t* const ptr1 = src1 + y * stride1;
+    const uint8_t* const ptr2 = src2 + y * stride2;
+    for (x = 0; x < w * x_stride; x += x_stride) {
+      const int diff = abs(ptr1[x] - ptr2[x]);
+      if (diff > max) max = diff;
+      ptr1[x] = diff;
+    }
+  }
+
+  if (do_scaling) RescalePlane(src1, w, h, x_stride, stride1, max);
+  return max;
+}
+
+//------------------------------------------------------------------------------
+// SSIM calculation. We re-implement these functions here, out of dsp/, to avoid
+// breaking the library's hidden visibility. This code duplication avoids the
+// bigger annoyance of having to open up internal details of libdsp...
+
+#define SSIM_KERNEL 3   // total size of the kernel: 2 * SSIM_KERNEL + 1
+
+// struct for accumulating statistical moments
+typedef struct {
+  uint32_t w;              // sum(w_i) : sum of weights
+  uint32_t xm, ym;         // sum(w_i * x_i), sum(w_i * y_i)
+  uint32_t xxm, xym, yym;  // sum(w_i * x_i * x_i), etc.
+} DistoStats;
+
+// hat-shaped filter. Sum of coefficients is equal to 16.
+static const uint32_t kWeight[2 * SSIM_KERNEL + 1] = { 1, 2, 3, 4, 3, 2, 1 };
+
+static WEBP_INLINE double SSIMCalculation(const DistoStats* const stats) {
+  const uint32_t N = stats->w;
+  const uint32_t w2 =  N * N;
+  const uint32_t C1 = 20 * w2;
+  const uint32_t C2 = 60 * w2;
+  const uint32_t C3 = 8 * 8 * w2;   // 'dark' limit ~= 6
+  const uint64_t xmxm = (uint64_t)stats->xm * stats->xm;
+  const uint64_t ymym = (uint64_t)stats->ym * stats->ym;
+  if (xmxm + ymym >= C3) {
+    const int64_t xmym = (int64_t)stats->xm * stats->ym;
+    const int64_t sxy = (int64_t)stats->xym * N - xmym;    // can be negative
+    const uint64_t sxx = (uint64_t)stats->xxm * N - xmxm;
+    const uint64_t syy = (uint64_t)stats->yym * N - ymym;
+    // we descale by 8 to prevent overflow during the fnum/fden multiply.
+    const uint64_t num_S = (2 * (uint64_t)(sxy < 0 ? 0 : sxy) + C2) >> 8;
+    const uint64_t den_S = (sxx + syy + C2) >> 8;
+    const uint64_t fnum = (2 * xmym + C1) * num_S;
+    const uint64_t fden = (xmxm + ymym + C1) * den_S;
+    const double r = (double)fnum / fden;
+    assert(r >= 0. && r <= 1.0);
+    return r;
+  }
+  return 1.;   // area is too dark to contribute meaningfully
+}
+
+static double SSIMGetClipped(const uint8_t* src1, int stride1,
+                             const uint8_t* src2, int stride2,
+                             int xo, int yo, int W, int H) {
+  DistoStats stats = { 0, 0, 0, 0, 0, 0 };
+  const int ymin = (yo - SSIM_KERNEL < 0) ? 0 : yo - SSIM_KERNEL;
+  const int ymax = (yo + SSIM_KERNEL > H - 1) ? H - 1 : yo + SSIM_KERNEL;
+  const int xmin = (xo - SSIM_KERNEL < 0) ? 0 : xo - SSIM_KERNEL;
+  const int xmax = (xo + SSIM_KERNEL > W - 1) ? W - 1 : xo + SSIM_KERNEL;
+  int x, y;
+  src1 += ymin * stride1;
+  src2 += ymin * stride2;
+  for (y = ymin; y <= ymax; ++y, src1 += stride1, src2 += stride2) {
+    for (x = xmin; x <= xmax; ++x) {
+      const uint32_t w = kWeight[SSIM_KERNEL + x - xo]
+                       * kWeight[SSIM_KERNEL + y - yo];
+      const uint32_t s1 = src1[x];
+      const uint32_t s2 = src2[x];
+      stats.w   += w;
+      stats.xm  += w * s1;
+      stats.ym  += w * s2;
+      stats.xxm += w * s1 * s1;
+      stats.xym += w * s1 * s2;
+      stats.yym += w * s2 * s2;
+    }
+  }
+  return SSIMCalculation(&stats);
+}
+
+// Compute SSIM-score map. Return -1 in case of error, max diff otherwise.
+static int SSIMScaleChannel(uint8_t* src1, int stride1,
+                            const uint8_t* src2, int stride2,
+                            int x_stride, int w, int h, int do_scaling) {
+  int x, y;
+  int max = 0;
+  uint8_t* const plane1 = (uint8_t*)malloc(2 * w * h * sizeof(*plane1));
+  uint8_t* const plane2 = plane1 + w * h;
+  if (plane1 == NULL) return -1;
+
+  // extract plane
+  for (y = 0; y < h; ++y) {
+    for (x = 0; x < w; ++x) {
+      plane1[x + y * w] = src1[x * x_stride + y * stride1];
+      plane2[x + y * w] = src2[x * x_stride + y * stride2];
+    }
+  }
+  for (y = 0; y < h; ++y) {
+    for (x = 0; x < w; ++x) {
+      const double ssim = SSIMGetClipped(plane1, w, plane2, w, x, y, w, h);
+      int diff = (int)(255 * (1. - ssim));
+      if (diff < 0) {
+        diff = 0;
+      } else if (diff > max) {
+        max = diff;
+      }
+      src1[x * x_stride + y * stride1] = (diff > 255) ? 255u : (uint8_t)diff;
+    }
+  }
+  free(plane1);
+
+  if (do_scaling) RescalePlane(src1, w, h, x_stride, stride1, max);
+  return max;
+}
+
+// Convert an argb picture to luminance.
+static void ConvertToGray(WebPPicture* const pic) {
+  int x, y;
+  assert(pic != NULL);
+  assert(pic->use_argb);
+  for (y = 0; y < pic->height; ++y) {
+    uint32_t* const row = &pic->argb[y * pic->argb_stride];
+    for (x = 0; x < pic->width; ++x) {
+      const uint32_t argb = row[x];
+      const uint32_t r = (argb >> 16) & 0xff;
+      const uint32_t g = (argb >>  8) & 0xff;
+      const uint32_t b = (argb >>  0) & 0xff;
+      // We use BT.709 for converting to luminance.
+      const uint32_t Y = (uint32_t)(0.2126 * r + 0.7152 * g + 0.0722 * b + .5);
+      row[x] = (argb & 0xff000000u) | (Y * 0x010101u);
+    }
+  }
+}
+
+static void Help(void) {
+  fprintf(stderr,
+          "Usage: get_disto [-ssim][-psnr][-alpha] compressed.webp orig.webp\n"
+          "  -ssim ..... print SSIM distortion\n"
+          "  -psnr ..... print PSNR distortion (default)\n"
+          "  -alpha .... preserve alpha plane\n"
+          "  -h ........ this message\n"
+          "  -o <file> . save the diff map as a WebP lossless file\n"
+          "  -scale .... scale the difference map to fit [0..255] range\n"
+          "  -gray ..... use grayscale for difference map (-scale)\n"
+          " Also handles PNG, JPG and TIFF files, in addition to WebP.\n");
+}
+
+int main(int argc, const char *argv[]) {
+  WebPPicture pic1, pic2;
+  size_t size1 = 0, size2 = 0;
+  int ret = 1;
+  float disto[5];
+  int type = 0;
+  int c;
+  int help = 0;
+  int keep_alpha = 0;
+  int scale = 0;
+  int use_gray = 0;
+  const char* name1 = NULL;
+  const char* name2 = NULL;
+  const char* output = NULL;
+
+  if (!WebPPictureInit(&pic1) || !WebPPictureInit(&pic2)) {
+    fprintf(stderr, "Can't init pictures\n");
+    return 1;
+  }
+
+  for (c = 1; c < argc; ++c) {
+    if (!strcmp(argv[c], "-ssim")) {
+      type = 1;
+    } else if (!strcmp(argv[c], "-psnr")) {
+      type = 0;
+    } else if (!strcmp(argv[c], "-alpha")) {
+      keep_alpha = 1;
+    } else if (!strcmp(argv[c], "-scale")) {
+      scale = 1;
+    } else if (!strcmp(argv[c], "-gray")) {
+      use_gray = 1;
+    } else if (!strcmp(argv[c], "-h")) {
+      help = 1;
+      ret = 0;
+    } else if (!strcmp(argv[c], "-o")) {
+      if (++c == argc) {
+        fprintf(stderr, "missing file name after %s option.\n", argv[c - 1]);
+        goto End;
+      }
+      output = argv[c];
+    } else if (name1 == NULL) {
+      name1 = argv[c];
+    } else {
+      name2 = argv[c];
+    }
+  }
+  if (help || name1 == NULL || name2 == NULL) {
+    if (!help) {
+      fprintf(stderr, "Error: missing arguments.\n");
+    }
+    Help();
+    goto End;
+  }
+  size1 = ReadPicture(name1, &pic1, 1);
+  size2 = ReadPicture(name2, &pic2, 1);
+  if (size1 == 0 || size2 == 0) goto End;
+
+  if (!keep_alpha) {
+    WebPBlendAlpha(&pic1, 0x00000000);
+    WebPBlendAlpha(&pic2, 0x00000000);
+  }
+
+  if (!WebPPictureDistortion(&pic1, &pic2, type, disto)) {
+    fprintf(stderr, "Error while computing the distortion.\n");
+    goto End;
+  }
+  printf("%u %.2f    %.2f %.2f %.2f %.2f\n",
+         (unsigned int)size1,
+         disto[4], disto[0], disto[1], disto[2], disto[3]);
+
+  if (output != NULL) {
+    uint8_t* data = NULL;
+    size_t data_size = 0;
+    if (pic1.use_argb != pic2.use_argb) {
+      fprintf(stderr, "Pictures are not in the same argb format. "
+                      "Can't save the difference map.\n");
+      goto End;
+    }
+    if (pic1.use_argb) {
+      int n;
+      fprintf(stderr, "max differences per channel: ");
+      for (n = 0; n < 3; ++n) {    // skip the alpha channel
+        const int range = (type == 1) ?
+          SSIMScaleChannel((uint8_t*)pic1.argb + n, pic1.argb_stride * 4,
+                           (const uint8_t*)pic2.argb + n, pic2.argb_stride * 4,
+                           4, pic1.width, pic1.height, scale) :
+          DiffScaleChannel((uint8_t*)pic1.argb + n, pic1.argb_stride * 4,
+                           (const uint8_t*)pic2.argb + n, pic2.argb_stride * 4,
+                           4, pic1.width, pic1.height, scale);
+        if (range < 0) fprintf(stderr, "\nError computing diff map\n");
+        fprintf(stderr, "[%d]", range);
+      }
+      fprintf(stderr, "\n");
+      if (use_gray) ConvertToGray(&pic1);
+    } else {
+      fprintf(stderr, "Can only compute the difference map in ARGB format.\n");
+      goto End;
+    }
+    data_size = WebPEncodeLosslessBGRA((const uint8_t*)pic1.argb,
+                                       pic1.width, pic1.height,
+                                       pic1.argb_stride * 4,
+                                       &data);
+    if (data_size == 0) {
+      fprintf(stderr, "Error during lossless encoding.\n");
+      goto End;
+    }
+    ret = ImgIoUtilWriteFile(output, data, data_size) ? 0 : 1;
+    WebPFree(data);
+    if (ret) goto End;
+  }
+  ret = 0;
+
+ End:
+  WebPPictureFree(&pic1);
+  WebPPictureFree(&pic2);
+  return ret;
+}

extras/quality_estimate.c

@@ -0,0 +1,129 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  VP8EstimateQuality(): rough encoding quality estimate
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "./extras.h"
+#include "webp/decode.h"
+
+#include <math.h>
+
+//------------------------------------------------------------------------------
+
+#define INVALID_BIT_POS (1ull << 63)
+
+// In most cases, we don't need to use a full arithmetic decoder, since
+// all the header's bits are written using a uniform probability of 128.
+// We can just parse the header as if it was bits (works in 99.999% cases).
+static WEBP_INLINE uint32_t GetBit(const uint8_t* const data, size_t nb,
+                                   uint64_t max_size, uint64_t* const bit_pos) {
+  uint32_t val = 0;
+  if (*bit_pos + nb <= 8 * max_size) {
+    while (nb-- > 0) {
+      const uint64_t p = (*bit_pos)++;
+      const int bit = !!(data[p >> 3] & (128 >> ((p & 7))));
+      val = (val << 1) | bit;
+    }
+  } else {
+    *bit_pos = INVALID_BIT_POS;
+  }
+  return val;
+}
+
+#define GET_BIT(n) GetBit(data, (n), size, &bit_pos)
+#define CONDITIONAL_SKIP(n) (GET_BIT(1) ? GET_BIT((n)) : 0)
+
+int VP8EstimateQuality(const uint8_t* const data, size_t size) {
+  size_t pos = 0;
+  uint64_t bit_pos;
+  uint64_t sig = 0x00;
+  int ok = 0;
+  int Q = -1;
+  WebPBitstreamFeatures features;
+
+  if (data == NULL) return -1;
+
+  if (WebPGetFeatures(data, size, &features) != VP8_STATUS_OK) {
+    return -1;   // invalid file
+  }
+  if (features.format == 2) return 101;  // lossless
+  if (features.format == 0 || features.has_animation) return -1;   // mixed
+
+  while (pos < size) {
+    sig = (sig >> 8) | ((uint64_t)data[pos++] << 40);
+    if ((sig >> 24) == 0x2a019dull) {
+      ok = 1;
+      break;
+    }
+  }
+  if (!ok) return -1;
+  if (pos + 4 > size) return -1;
+
+  // Skip main Header
+  // width  = (data[pos + 0] | (data[pos + 1] << 8)) & 0x3fff;
+  // height = (data[pos + 2] | (data[pos + 3] << 8)) & 0x3fff;
+  pos += 4;
+  bit_pos = pos * 8;
+
+  GET_BIT(2);  // color_space + clamp type
+
+  // Segment header
+  if (GET_BIT(1)) {       // use_segment_
+    int s;
+    const int update_map = GET_BIT(1);
+    if (GET_BIT(1)) {     // update data
+      const int absolute_delta = GET_BIT(1);
+      int q[4]  = { 0, 0, 0, 0 };
+      for (s = 0; s < 4; ++s) {
+        if (GET_BIT(1)) {
+          q[s] = GET_BIT(7);
+          if (GET_BIT(1)) q[s] = -q[s];   // sign
+        }
+      }
+      if (absolute_delta) Q = q[0];  // just use the first segment's quantizer
+      for (s = 0; s < 4; ++s) CONDITIONAL_SKIP(7);   //  filter strength
+    }
+    if (update_map) {
+      for (s = 0; s < 3; ++s) CONDITIONAL_SKIP(8);
+    }
+  }
+  // Filter header
+  GET_BIT(1 + 6 + 3);     // simple + level + sharpness
+  if (GET_BIT(1)) {       // use_lf_delta
+    if (GET_BIT(1)) {     // update lf_delta?
+      int n;
+      for (n = 0; n < 4 + 4; ++n) CONDITIONAL_SKIP(6);
+    }
+  }
+  // num partitions
+  GET_BIT(2);
+
+  // ParseQuant
+  {
+    const int base_q = GET_BIT(7);
+    /* dqy1_dc = */ CONDITIONAL_SKIP(5);
+    /* dqy2_dc = */ CONDITIONAL_SKIP(5);
+    /* dqy2_ac = */ CONDITIONAL_SKIP(5);
+    /* dquv_dc = */ CONDITIONAL_SKIP(5);
+    /* dquv_ac = */ CONDITIONAL_SKIP(5);
+
+    if (Q < 0) Q = base_q;
+  }
+  if (bit_pos == INVALID_BIT_POS) return -1;
+
+  // base mapping
+  Q = (127 - Q) * 100 / 127;
+  // correction for power-law behavior in low range
+  if (Q < 80) {
+    Q = (int)(pow(Q / 80., 1. / 0.38) * 80);
+  }
+  return Q;
+}

extras/vwebp_sdl.c

@@ -0,0 +1,96 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Simple SDL-based WebP file viewer.
+// Does not support animation, just static images.
+//
+// Press 'q' to exit.
+//
+// Author: James Zern (jzern@google.com)
+
+#include <stdio.h>
+
+#ifdef HAVE_CONFIG_H
+#include "webp/config.h"
+#endif
+
+#if defined(WEBP_HAVE_SDL)
+
+#include "webp_to_sdl.h"
+#include "webp/decode.h"
+#include "../imageio/imageio_util.h"
+
+#if defined(WEBP_HAVE_JUST_SDL_H)
+#include <SDL.h>
+#else
+#include <SDL/SDL.h>
+#endif
+
+static void ProcessEvents(void) {
+  int done = 0;
+  SDL_Event event;
+  while (!done && SDL_WaitEvent(&event)) {
+    switch (event.type) {
+      case SDL_KEYUP:
+        switch (event.key.keysym.sym) {
+          case SDLK_q: done = 1; break;
+          default: break;
+        }
+        break;
+      default: break;
+    }
+  }
+}
+
+int main(int argc, char* argv[]) {
+  int c;
+  int ok = 0;
+  for (c = 1; c < argc; ++c) {
+    const char* file = NULL;
+    const uint8_t* webp = NULL;
+    size_t webp_size = 0;
+    if (!strcmp(argv[c], "-h")) {
+      printf("Usage: %s [-h] image.webp [more_files.webp...]\n", argv[0]);
+      return 0;
+    } else {
+      file = argv[c];
+    }
+    if (file == NULL) continue;
+    if (!ImgIoUtilReadFile(file, &webp, &webp_size)) {
+      fprintf(stderr, "Error opening file: %s\n", file);
+      goto Error;
+    }
+    if (webp_size != (size_t)(int)webp_size) {
+      fprintf(stderr, "File too large.\n");
+      goto Error;
+    }
+    ok = WebpToSDL((const char*)webp, (int)webp_size);
+    free((void*)webp);
+    if (!ok) {
+      fprintf(stderr, "Error decoding file %s\n", file);
+      goto Error;
+    }
+    ProcessEvents();
+  }
+  ok = 1;
+
+ Error:
+  SDL_Quit();
+  return ok ? 0 : 1;
+}
+
+#else  // !WEBP_HAVE_SDL
+
+int main(int argc, const char *argv[]) {
+  fprintf(stderr, "SDL support not enabled in %s.\n", argv[0]);
+  (void)argc;
+  return 0;
+}
+
+#endif

extras/webp_quality.c

@@ -0,0 +1,50 @@
+// Simple tool to roughly evaluate the quality encoding of a webp bitstream
+//
+// Result is a *rough* estimation of the quality. You should just consider
+// the bucket it's in (q > 80? > 50? > 20?) and not take it for face value.
+/*
+ gcc -o webp_quality webp_quality.c -O3 -I../ -L. -L../imageio \
+    -limageio_util -lwebpextras -lwebp -lm -lpthread
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "./extras.h"
+#include "../imageio/imageio_util.h"
+
+int main(int argc, const char *argv[]) {
+  int c;
+  int quiet = 0;
+  int ok = 1;
+  for (c = 1; ok && c < argc; ++c) {
+    if (!strcmp(argv[c], "-quiet")) {
+      quiet = 1;
+    } else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
+      printf("webp_quality [-h][-quiet] webp_files...\n");
+      return 0;
+    } else {
+      const char* const filename = argv[c];
+      const uint8_t* data = NULL;
+      size_t data_size = 0;
+      int q;
+      ok = ImgIoUtilReadFile(filename, &data, &data_size);
+      if (!ok) break;
+      q = VP8EstimateQuality(data, data_size);
+      if (!quiet) printf("[%s] ", filename);
+      if (q < 0) {
+        fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
+        ok = 0;
+      } else {
+        if (!quiet) {
+          printf("Estimated quality factor: %d\n", q);
+        } else {
+          printf("%d\n", q);   // just print the number
+        }
+      }
+      free((void*)data);
+    }
+  }
+  return ok ? 0 : 1;
+}

extras/webp_to_sdl.c

@@ -0,0 +1,105 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  Simple WebP-to-SDL wrapper. Useful for emscripten.
+//
+// Author: James Zern (jzern@google.com)
+
+#ifdef HAVE_CONFIG_H
+#include "webp/config.h"
+#endif
+
+#if defined(WEBP_HAVE_SDL)
+
+#include "webp_to_sdl.h"
+
+#include <stdio.h>
+#include "webp/decode.h"
+
+#if defined(WEBP_HAVE_JUST_SDL_H)
+#include <SDL.h>
+#else
+#include <SDL/SDL.h>
+#endif
+
+int WebpToSDL(const char* data, unsigned int data_size) {
+  int ok = 0;
+  VP8StatusCode status;
+  WebPDecoderConfig config;
+  WebPBitstreamFeatures* const input = &config.input;
+  WebPDecBuffer* const output = &config.output;
+  SDL_Surface* screen = NULL;
+  SDL_Surface* surface = NULL;
+
+  if (!WebPInitDecoderConfig(&config)) {
+    fprintf(stderr, "Library version mismatch!\n");
+    return 1;
+  }
+
+  SDL_Init(SDL_INIT_VIDEO);
+
+  status = WebPGetFeatures((uint8_t*)data, (size_t)data_size, &config.input);
+  if (status != VP8_STATUS_OK) goto Error;
+
+  screen = SDL_SetVideoMode(input->width, input->height, 32, SDL_SWSURFACE);
+  if (screen == NULL) {
+    fprintf(stderr, "Unable to set video mode (32bpp %dx%d)!\n",
+            input->width, input->height);
+    goto Error;
+  }
+
+  surface = SDL_CreateRGBSurface(SDL_SWSURFACE,
+                                 input->width, input->height, 32,
+                                 0x000000ffu,   // R mask
+                                 0x0000ff00u,   // G mask
+                                 0x00ff0000u,   // B mask
+                                 0xff000000u);  // A mask
+
+  if (surface == NULL) {
+    fprintf(stderr, "Unable to create %dx%d RGBA surface!\n",
+            input->width, input->height);
+    goto Error;
+  }
+  if (SDL_MUSTLOCK(surface)) SDL_LockSurface(surface);
+
+#if SDL_BYTEORDER == SDL_BIG_ENDIAN
+  output->colorspace = MODE_BGRA;
+#else
+  output->colorspace = MODE_RGBA;
+#endif
+  output->width  = surface->w;
+  output->height = surface->h;
+  output->u.RGBA.rgba   = surface->pixels;
+  output->u.RGBA.stride = surface->pitch;
+  output->u.RGBA.size   = surface->pitch * surface->h;
+  output->is_external_memory = 1;
+
+  status = WebPDecode((const uint8_t*)data, (size_t)data_size, &config);
+  if (status != VP8_STATUS_OK) {
+    fprintf(stderr, "Error decoding image (%d)\n", status);
+    goto Error;
+  }
+
+  if (SDL_MUSTLOCK(surface)) SDL_UnlockSurface(surface);
+  if (SDL_BlitSurface(surface, NULL, screen, NULL) ||
+      SDL_Flip(screen)) {
+    goto Error;
+  }
+
+  ok = 1;
+
+ Error:
+  SDL_FreeSurface(surface);
+  SDL_FreeSurface(screen);
+  return ok;
+}
+
+//------------------------------------------------------------------------------
+
+#endif  // WEBP_HAVE_SDL

extras/webp_to_sdl.h

@@ -0,0 +1,22 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  Simple WebP-to-SDL wrapper. Useful for emscripten.
+//
+// Author: James Zern (jzern@google.com)
+
+#ifndef WEBP_EXTRAS_WEBP_TO_SDL_H_
+#define WEBP_EXTRAS_WEBP_TO_SDL_H_
+
+// Exports the method WebpToSDL(const char* data, int data_size) which decodes
+// a WebP bitstream into an RGBA SDL surface.
+// Return false on failure.
+extern int WebpToSDL(const char* data, unsigned int data_size);
+
+#endif  // WEBP_EXTRAS_WEBP_TO_SDL_H_

imageio/Android.mk

@@ -0,0 +1,54 @@
+LOCAL_PATH := $(call my-dir)
+
+################################################################################
+# libimageio_util
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    imageio_util.c \
+
+LOCAL_CFLAGS := $(WEBP_CFLAGS)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
+
+LOCAL_MODULE := imageio_util
+
+include $(BUILD_STATIC_LIBRARY)
+
+################################################################################
+# libimagedec
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    image_dec.c \
+    jpegdec.c \
+    metadata.c \
+    pngdec.c \
+    pnmdec.c \
+    tiffdec.c \
+    webpdec.c \
+
+LOCAL_CFLAGS := $(WEBP_CFLAGS)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
+LOCAL_STATIC_LIBRARIES := imageio_util
+
+LOCAL_MODULE := imagedec
+
+include $(BUILD_STATIC_LIBRARY)
+
+################################################################################
+# libimageenc
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+    image_enc.c \
+
+LOCAL_CFLAGS := $(WEBP_CFLAGS)
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
+LOCAL_STATIC_LIBRARIES := imageio_util
+
+LOCAL_MODULE := imageenc
+
+include $(BUILD_STATIC_LIBRARY)

imageio/Makefile.am

@@ -0,0 +1,23 @@
+AM_CPPFLAGS += -I$(top_builddir)/src -I$(top_srcdir)/src
+noinst_LTLIBRARIES = libimageio_util.la libimagedec.la libimageenc.la
+
+noinst_HEADERS =
+noinst_HEADERS += ../src/webp/decode.h
+noinst_HEADERS += ../src/webp/types.h
+
+libimageio_util_la_SOURCES = imageio_util.c imageio_util.h
+
+libimagedec_la_SOURCES  = image_dec.c image_dec.h
+libimagedec_la_SOURCES += jpegdec.c jpegdec.h
+libimagedec_la_SOURCES += metadata.c metadata.h
+libimagedec_la_SOURCES += pngdec.c pngdec.h
+libimagedec_la_SOURCES += pnmdec.c pnmdec.h
+libimagedec_la_SOURCES += tiffdec.c tiffdec.h
+libimagedec_la_SOURCES += webpdec.c webpdec.h
+libimagedec_la_SOURCES += wicdec.c wicdec.h
+libimagedec_la_CPPFLAGS = $(JPEG_INCLUDES) $(PNG_INCLUDES) $(TIFF_INCLUDES)
+libimagedec_la_CPPFLAGS += $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
+
+libimageenc_la_SOURCES  = image_enc.c image_enc.h
+libimageenc_la_CPPFLAGS = $(JPEG_INCLUDES) $(PNG_INCLUDES) $(TIFF_INCLUDES)
+libimageenc_la_CPPFLAGS += $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)

imageio/image_dec.c

@@ -29,18 +29,38 @@ WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
       format = WEBP_TIFF_FORMAT;
     } else if (magic1 == 0x52494646 && magic2 == 0x57454250) {
       format = WEBP_WEBP_FORMAT;
+    } else if (((magic1 >> 24) & 0xff) == 'P') {
+      const int type = (magic1 >> 16) & 0xff;
+      // we only support 'P5 -> P7' for now.
+      if (type >= '5' && type <= '7') format = WEBP_PNM_FORMAT;
     }
   }
   return format;
 }
 
-WebPImageReader WebPGuessImageReader(const uint8_t* const data,
-                                     size_t data_size) {
-  switch (WebPGuessImageType(data, data_size)) {
+static int FailReader(const uint8_t* const data, size_t data_size,
+                      struct WebPPicture* const pic,
+                      int keep_alpha, struct Metadata* const metadata) {
+  (void)data;
+  (void)data_size;
+  (void)pic;
+  (void)keep_alpha;
+  (void)metadata;
+  return 0;
+}
+
+WebPImageReader WebPGetImageReader(WebPInputFileFormat format) {
+  switch (format) {
     case WEBP_PNG_FORMAT: return ReadPNG;
     case WEBP_JPEG_FORMAT: return ReadJPEG;
     case WEBP_TIFF_FORMAT: return ReadTIFF;
     case WEBP_WEBP_FORMAT: return ReadWebP;
-    default: return NULL;
+    case WEBP_PNM_FORMAT: return ReadPNM;
+    default: return FailReader;
   }
-}
+}
+
+WebPImageReader WebPGuessImageReader(const uint8_t* const data,
+                                     size_t data_size) {
+  return WebPGetImageReader(WebPGuessImageType(data, data_size));
+}

imageio/image_dec.h

@@ -11,8 +11,8 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#ifndef WEBP_EXAMPLES_IMAGE_DEC_H_
-#define WEBP_EXAMPLES_IMAGE_DEC_H_
+#ifndef WEBP_IMAGEIO_IMAGE_DEC_H_
+#define WEBP_IMAGEIO_IMAGE_DEC_H_
 
 #include "webp/types.h"
 
@@ -23,6 +23,7 @@
 #include "./metadata.h"
 #include "./jpegdec.h"
 #include "./pngdec.h"
+#include "./pnmdec.h"
 #include "./tiffdec.h"
 #include "./webpdec.h"
 #include "./wicdec.h"
@@ -36,6 +37,7 @@ typedef enum {
   WEBP_JPEG_FORMAT,
   WEBP_TIFF_FORMAT,
   WEBP_WEBP_FORMAT,
+  WEBP_PNM_FORMAT,
   WEBP_UNSUPPORTED_FORMAT
 } WebPInputFileFormat;
 
@@ -49,8 +51,12 @@ typedef int (*WebPImageReader)(const uint8_t* const data, size_t data_size,
                                struct WebPPicture* const pic,
                                int keep_alpha, struct Metadata* const metadata);
 
+// Return the reader associated to a given file format.
+WebPImageReader WebPGetImageReader(WebPInputFileFormat format);
+
 // This function is similar to WebPGuessImageType(), but returns a
-// suitable reader function. Or NULL if the image can't be guessed.
+// suitable reader function. The returned reader is never NULL, but
+// unknown formats will return an always-failing valid reader.
 WebPImageReader WebPGuessImageReader(const uint8_t* const data,
                                      size_t data_size);
 
@@ -58,4 +64,4 @@ WebPImageReader WebPGuessImageReader(const uint8_t* const data,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_IMAGE_DEC_H_
+#endif  // WEBP_IMAGEIO_IMAGE_DEC_H_

imageio/image_enc.c

@@ -0,0 +1,594 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Save image
+
+#include "./image_enc.h"
+
+#include <assert.h>
+#include <string.h>
+
+#ifdef WEBP_HAVE_PNG
+#include <png.h>
+#include <setjmp.h>   // note: this must be included *after* png.h
+#endif
+
+#ifdef HAVE_WINCODEC_H
+#ifdef __MINGW32__
+#define INITGUID  // Without this GUIDs are declared extern and fail to link
+#endif
+#define CINTERFACE
+#define COBJMACROS
+#define _WIN32_IE 0x500  // Workaround bug in shlwapi.h when compiling C++
+                         // code with COBJMACROS.
+#include <ole2.h>  // CreateStreamOnHGlobal()
+#include <shlwapi.h>
+#include <windows.h>
+#include <wincodec.h>
+#endif
+
+#include "./imageio_util.h"
+
+//------------------------------------------------------------------------------
+// PNG
+
+#ifdef HAVE_WINCODEC_H
+
+#define IFS(fn)                                                     \
+  do {                                                              \
+    if (SUCCEEDED(hr)) {                                            \
+      hr = (fn);                                                    \
+      if (FAILED(hr)) fprintf(stderr, #fn " failed %08lx\n", hr);   \
+    }                                                               \
+  } while (0)
+
+#ifdef __cplusplus
+#define MAKE_REFGUID(x) (x)
+#else
+#define MAKE_REFGUID(x) &(x)
+#endif
+
+static HRESULT CreateOutputStream(const char* out_file_name,
+                                  int write_to_mem, IStream** stream) {
+  HRESULT hr = S_OK;
+  if (write_to_mem) {
+    // Output to a memory buffer. This is freed when 'stream' is released.
+    IFS(CreateStreamOnHGlobal(NULL, TRUE, stream));
+  } else {
+    IFS(SHCreateStreamOnFileA(out_file_name, STGM_WRITE | STGM_CREATE, stream));
+  }
+  if (FAILED(hr)) {
+    fprintf(stderr, "Error opening output file %s (%08lx)\n",
+            out_file_name, hr);
+  }
+  return hr;
+}
+
+static HRESULT WriteUsingWIC(const char* out_file_name, int use_stdout,
+                             REFGUID container_guid,
+                             uint8_t* rgb, int stride,
+                             uint32_t width, uint32_t height, int has_alpha) {
+  HRESULT hr = S_OK;
+  IWICImagingFactory* factory = NULL;
+  IWICBitmapFrameEncode* frame = NULL;
+  IWICBitmapEncoder* encoder = NULL;
+  IStream* stream = NULL;
+  WICPixelFormatGUID pixel_format = has_alpha ? GUID_WICPixelFormat32bppBGRA
+                                              : GUID_WICPixelFormat24bppBGR;
+
+  if (out_file_name == NULL || rgb == NULL) return E_INVALIDARG;
+
+  IFS(CoInitialize(NULL));
+  IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
+                       CLSCTX_INPROC_SERVER,
+                       MAKE_REFGUID(IID_IWICImagingFactory),
+                       (LPVOID*)&factory));
+  if (hr == REGDB_E_CLASSNOTREG) {
+    fprintf(stderr,
+            "Couldn't access Windows Imaging Component (are you running "
+            "Windows XP SP3 or newer?). PNG support not available. "
+            "Use -ppm or -pgm for available PPM and PGM formats.\n");
+  }
+  IFS(CreateOutputStream(out_file_name, use_stdout, &stream));
+  IFS(IWICImagingFactory_CreateEncoder(factory, container_guid, NULL,
+                                       &encoder));
+  IFS(IWICBitmapEncoder_Initialize(encoder, stream,
+                                   WICBitmapEncoderNoCache));
+  IFS(IWICBitmapEncoder_CreateNewFrame(encoder, &frame, NULL));
+  IFS(IWICBitmapFrameEncode_Initialize(frame, NULL));
+  IFS(IWICBitmapFrameEncode_SetSize(frame, width, height));
+  IFS(IWICBitmapFrameEncode_SetPixelFormat(frame, &pixel_format));
+  IFS(IWICBitmapFrameEncode_WritePixels(frame, height, stride,
+                                        height * stride, rgb));
+  IFS(IWICBitmapFrameEncode_Commit(frame));
+  IFS(IWICBitmapEncoder_Commit(encoder));
+
+  if (SUCCEEDED(hr) && use_stdout) {
+    HGLOBAL image;
+    IFS(GetHGlobalFromStream(stream, &image));
+    if (SUCCEEDED(hr)) {
+      HANDLE std_output = GetStdHandle(STD_OUTPUT_HANDLE);
+      DWORD mode;
+      const BOOL update_mode = GetConsoleMode(std_output, &mode);
+      const void* const image_mem = GlobalLock(image);
+      DWORD bytes_written = 0;
+
+      // Clear output processing if necessary, then output the image.
+      if (update_mode) SetConsoleMode(std_output, 0);
+      if (!WriteFile(std_output, image_mem, (DWORD)GlobalSize(image),
+                     &bytes_written, NULL) ||
+          bytes_written != GlobalSize(image)) {
+        hr = E_FAIL;
+      }
+      if (update_mode) SetConsoleMode(std_output, mode);
+      GlobalUnlock(image);
+    }
+  }
+
+  if (frame != NULL) IUnknown_Release(frame);
+  if (encoder != NULL) IUnknown_Release(encoder);
+  if (factory != NULL) IUnknown_Release(factory);
+  if (stream != NULL) IUnknown_Release(stream);
+  return hr;
+}
+
+int WebPWritePNG(const char* out_file_name, int use_stdout,
+                 const WebPDecBuffer* const buffer) {
+  const uint32_t width = buffer->width;
+  const uint32_t height = buffer->height;
+  uint8_t* const rgb = buffer->u.RGBA.rgba;
+  const int stride = buffer->u.RGBA.stride;
+  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
+
+  return SUCCEEDED(WriteUsingWIC(out_file_name, use_stdout,
+                                 MAKE_REFGUID(GUID_ContainerFormatPng),
+                                 rgb, stride, width, height, has_alpha));
+}
+
+#elif defined(WEBP_HAVE_PNG)    // !HAVE_WINCODEC_H
+static void PNGAPI PNGErrorFunction(png_structp png, png_const_charp dummy) {
+  (void)dummy;  // remove variable-unused warning
+  longjmp(png_jmpbuf(png), 1);
+}
+
+int WebPWritePNG(FILE* out_file, const WebPDecBuffer* const buffer) {
+  const uint32_t width = buffer->width;
+  const uint32_t height = buffer->height;
+  png_bytep row = buffer->u.RGBA.rgba;
+  const int stride = buffer->u.RGBA.stride;
+  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
+  volatile png_structp png;
+  volatile png_infop info;
+  png_uint_32 y;
+
+  if (out_file == NULL || buffer == NULL) return 0;
+
+  png = png_create_write_struct(PNG_LIBPNG_VER_STRING,
+                                NULL, PNGErrorFunction, NULL);
+  if (png == NULL) {
+    return 0;
+  }
+  info = png_create_info_struct(png);
+  if (info == NULL) {
+    png_destroy_write_struct((png_structpp)&png, NULL);
+    return 0;
+  }
+  if (setjmp(png_jmpbuf(png))) {
+    png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
+    return 0;
+  }
+  png_init_io(png, out_file);
+  png_set_IHDR(png, info, width, height, 8,
+               has_alpha ? PNG_COLOR_TYPE_RGBA : PNG_COLOR_TYPE_RGB,
+               PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
+               PNG_FILTER_TYPE_DEFAULT);
+  png_write_info(png, info);
+  for (y = 0; y < height; ++y) {
+    png_write_rows(png, &row, 1);
+    row += stride;
+  }
+  png_write_end(png, info);
+  png_destroy_write_struct((png_structpp)&png, (png_infopp)&info);
+  return 1;
+}
+#else    // !HAVE_WINCODEC_H && !WEBP_HAVE_PNG
+int WebPWritePNG(FILE* fout, const WebPDecBuffer* const buffer) {
+  if (fout == NULL || buffer == NULL) return 0;
+
+  fprintf(stderr, "PNG support not compiled. Please install the libpng "
+          "development package before building.\n");
+  fprintf(stderr, "You can run with -ppm flag to decode in PPM format.\n");
+  return 0;
+}
+#endif
+
+//------------------------------------------------------------------------------
+// PPM / PAM
+
+static int WritePPMPAM(FILE* fout, const WebPDecBuffer* const buffer,
+                       int alpha) {
+  if (fout == NULL || buffer == NULL) {
+    return 0;
+  } else {
+    const uint32_t width = buffer->width;
+    const uint32_t height = buffer->height;
+    const uint8_t* row = buffer->u.RGBA.rgba;
+    const int stride = buffer->u.RGBA.stride;
+    const size_t bytes_per_px = alpha ? 4 : 3;
+    uint32_t y;
+
+    if (row == NULL) return 0;
+
+    if (alpha) {
+      fprintf(fout, "P7\nWIDTH %u\nHEIGHT %u\nDEPTH 4\nMAXVAL 255\n"
+                    "TUPLTYPE RGB_ALPHA\nENDHDR\n", width, height);
+    } else {
+      fprintf(fout, "P6\n%u %u\n255\n", width, height);
+    }
+    for (y = 0; y < height; ++y) {
+      if (fwrite(row, width, bytes_per_px, fout) != bytes_per_px) {
+        return 0;
+      }
+      row += stride;
+    }
+  }
+  return 1;
+}
+
+int WebPWritePPM(FILE* fout, const WebPDecBuffer* const buffer) {
+  return WritePPMPAM(fout, buffer, 0);
+}
+
+int WebPWritePAM(FILE* fout, const WebPDecBuffer* const buffer) {
+  return WritePPMPAM(fout, buffer, 1);
+}
+
+//------------------------------------------------------------------------------
+// Raw PGM
+
+// Save 16b mode (RGBA4444, RGB565, ...) for debugging purpose.
+int WebPWrite16bAsPGM(FILE* fout, const WebPDecBuffer* const buffer) {
+  const uint32_t width = buffer->width;
+  const uint32_t height = buffer->height;
+  const uint8_t* rgba = buffer->u.RGBA.rgba;
+  const int stride = buffer->u.RGBA.stride;
+  const uint32_t bytes_per_px = 2;
+  uint32_t y;
+
+  if (fout == NULL || buffer == NULL || rgba == NULL) return 0;
+
+  fprintf(fout, "P5\n%u %u\n255\n", width * bytes_per_px, height);
+  for (y = 0; y < height; ++y) {
+    if (fwrite(rgba, width, bytes_per_px, fout) != bytes_per_px) {
+      return 0;
+    }
+    rgba += stride;
+  }
+  return 1;
+}
+
+//------------------------------------------------------------------------------
+// BMP
+
+static void PutLE16(uint8_t* const dst, uint32_t value) {
+  dst[0] = (value >> 0) & 0xff;
+  dst[1] = (value >> 8) & 0xff;
+}
+
+static void PutLE32(uint8_t* const dst, uint32_t value) {
+  PutLE16(dst + 0, (value >>  0) & 0xffff);
+  PutLE16(dst + 2, (value >> 16) & 0xffff);
+}
+
+#define BMP_HEADER_SIZE 54
+int WebPWriteBMP(FILE* fout, const WebPDecBuffer* const buffer) {
+  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
+  const uint32_t width = buffer->width;
+  const uint32_t height = buffer->height;
+  const uint8_t* rgba = buffer->u.RGBA.rgba;
+  const int stride = buffer->u.RGBA.stride;
+  const uint32_t bytes_per_px = has_alpha ? 4 : 3;
+  uint32_t y;
+  const uint32_t line_size = bytes_per_px * width;
+  const uint32_t bmp_stride = (line_size + 3) & ~3;   // pad to 4
+  const uint32_t total_size = bmp_stride * height + BMP_HEADER_SIZE;
+  uint8_t bmp_header[BMP_HEADER_SIZE] = { 0 };
+
+  if (fout == NULL || buffer == NULL || rgba == NULL) return 0;
+
+  // bitmap file header
+  PutLE16(bmp_header + 0, 0x4d42);                // signature 'BM'
+  PutLE32(bmp_header + 2, total_size);            // size including header
+  PutLE32(bmp_header + 6, 0);                     // reserved
+  PutLE32(bmp_header + 10, BMP_HEADER_SIZE);      // offset to pixel array
+  // bitmap info header
+  PutLE32(bmp_header + 14, 40);                   // DIB header size
+  PutLE32(bmp_header + 18, width);                // dimensions
+  PutLE32(bmp_header + 22, -(int)height);         // vertical flip!
+  PutLE16(bmp_header + 26, 1);                    // number of planes
+  PutLE16(bmp_header + 28, bytes_per_px * 8);     // bits per pixel
+  PutLE32(bmp_header + 30, 0);                    // no compression (BI_RGB)
+  PutLE32(bmp_header + 34, 0);                    // image size (dummy)
+  PutLE32(bmp_header + 38, 2400);                 // x pixels/meter
+  PutLE32(bmp_header + 42, 2400);                 // y pixels/meter
+  PutLE32(bmp_header + 46, 0);                    // number of palette colors
+  PutLE32(bmp_header + 50, 0);                    // important color count
+
+  // TODO(skal): color profile
+
+  // write header
+  if (fwrite(bmp_header, sizeof(bmp_header), 1, fout) != 1) {
+    return 0;
+  }
+
+  // write pixel array
+  for (y = 0; y < height; ++y) {
+    if (fwrite(rgba, line_size, 1, fout) != 1) {
+      return 0;
+    }
+    // write padding zeroes
+    if (bmp_stride != line_size) {
+      const uint8_t zeroes[3] = { 0 };
+      if (fwrite(zeroes, bmp_stride - line_size, 1, fout) != 1) {
+        return 0;
+      }
+    }
+    rgba += stride;
+  }
+  return 1;
+}
+#undef BMP_HEADER_SIZE
+
+//------------------------------------------------------------------------------
+// TIFF
+
+#define NUM_IFD_ENTRIES 15
+#define EXTRA_DATA_SIZE 16
+// 10b for signature/header + n * 12b entries + 4b for IFD terminator:
+#define EXTRA_DATA_OFFSET (10 + 12 * NUM_IFD_ENTRIES + 4)
+#define TIFF_HEADER_SIZE (EXTRA_DATA_OFFSET + EXTRA_DATA_SIZE)
+
+int WebPWriteTIFF(FILE* fout, const WebPDecBuffer* const buffer) {
+  const int has_alpha = WebPIsAlphaMode(buffer->colorspace);
+  const uint32_t width = buffer->width;
+  const uint32_t height = buffer->height;
+  const uint8_t* rgba = buffer->u.RGBA.rgba;
+  const int stride = buffer->u.RGBA.stride;
+  const uint8_t bytes_per_px = has_alpha ? 4 : 3;
+  const uint8_t assoc_alpha =
+      WebPIsPremultipliedMode(buffer->colorspace) ? 1 : 2;
+  // For non-alpha case, we omit tag 0x152 (ExtraSamples).
+  const uint8_t num_ifd_entries = has_alpha ? NUM_IFD_ENTRIES
+                                            : NUM_IFD_ENTRIES - 1;
+  uint8_t tiff_header[TIFF_HEADER_SIZE] = {
+    0x49, 0x49, 0x2a, 0x00,   // little endian signature
+    8, 0, 0, 0,               // offset to the unique IFD that follows
+    // IFD (offset = 8). Entries must be written in increasing tag order.
+    num_ifd_entries, 0,       // Number of entries in the IFD (12 bytes each).
+    0x00, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    //  10: Width  (TBD)
+    0x01, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    //  22: Height (TBD)
+    0x02, 0x01, 3, 0, bytes_per_px, 0, 0, 0,     //  34: BitsPerSample: 8888
+        EXTRA_DATA_OFFSET + 0, 0, 0, 0,
+    0x03, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    //  46: Compression: none
+    0x06, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0,    //  58: Photometric: RGB
+    0x11, 0x01, 4, 0, 1, 0, 0, 0,                //  70: Strips offset:
+        TIFF_HEADER_SIZE, 0, 0, 0,               //      data follows header
+    0x12, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    //  82: Orientation: topleft
+    0x15, 0x01, 3, 0, 1, 0, 0, 0,                //  94: SamplesPerPixels
+        bytes_per_px, 0, 0, 0,
+    0x16, 0x01, 3, 0, 1, 0, 0, 0, 0, 0, 0, 0,    // 106: Rows per strip (TBD)
+    0x17, 0x01, 4, 0, 1, 0, 0, 0, 0, 0, 0, 0,    // 118: StripByteCount (TBD)
+    0x1a, 0x01, 5, 0, 1, 0, 0, 0,                // 130: X-resolution
+        EXTRA_DATA_OFFSET + 8, 0, 0, 0,
+    0x1b, 0x01, 5, 0, 1, 0, 0, 0,                // 142: Y-resolution
+        EXTRA_DATA_OFFSET + 8, 0, 0, 0,
+    0x1c, 0x01, 3, 0, 1, 0, 0, 0, 1, 0, 0, 0,    // 154: PlanarConfiguration
+    0x28, 0x01, 3, 0, 1, 0, 0, 0, 2, 0, 0, 0,    // 166: ResolutionUnit (inch)
+    0x52, 0x01, 3, 0, 1, 0, 0, 0,
+        assoc_alpha, 0, 0, 0,                    // 178: ExtraSamples: rgbA/RGBA
+    0, 0, 0, 0,                                  // 190: IFD terminator
+    // EXTRA_DATA_OFFSET:
+    8, 0, 8, 0, 8, 0, 8, 0,      // BitsPerSample
+    72, 0, 0, 0, 1, 0, 0, 0      // 72 pixels/inch, for X/Y-resolution
+  };
+  uint32_t y;
+
+  if (fout == NULL || buffer == NULL || rgba == NULL) return 0;
+
+  // Fill placeholders in IFD:
+  PutLE32(tiff_header + 10 + 8, width);
+  PutLE32(tiff_header + 22 + 8, height);
+  PutLE32(tiff_header + 106 + 8, height);
+  PutLE32(tiff_header + 118 + 8, width * bytes_per_px * height);
+  if (!has_alpha) PutLE32(tiff_header + 178, 0);  // IFD terminator
+
+  // write header
+  if (fwrite(tiff_header, sizeof(tiff_header), 1, fout) != 1) {
+    return 0;
+  }
+  // write pixel values
+  for (y = 0; y < height; ++y) {
+    if (fwrite(rgba, bytes_per_px, width, fout) != width) {
+      return 0;
+    }
+    rgba += stride;
+  }
+
+  return 1;
+}
+
+#undef TIFF_HEADER_SIZE
+#undef EXTRA_DATA_OFFSET
+#undef EXTRA_DATA_SIZE
+#undef NUM_IFD_ENTRIES
+
+//------------------------------------------------------------------------------
+// Raw Alpha
+
+int WebPWriteAlphaPlane(FILE* fout, const WebPDecBuffer* const buffer) {
+  if (fout == NULL || buffer == NULL) {
+    return 0;
+  } else {
+    const uint32_t width = buffer->width;
+    const uint32_t height = buffer->height;
+    const uint8_t* a = buffer->u.YUVA.a;
+    const int a_stride = buffer->u.YUVA.a_stride;
+    uint32_t y;
+
+    if (a == NULL) return 0;
+
+    fprintf(fout, "P5\n%u %u\n255\n", width, height);
+    for (y = 0; y < height; ++y) {
+      if (fwrite(a, width, 1, fout) != 1) return 0;
+      a += a_stride;
+    }
+    return 1;
+  }
+}
+
+//------------------------------------------------------------------------------
+// PGM with IMC4 layout
+
+int WebPWritePGM(FILE* fout, const WebPDecBuffer* const buffer) {
+  if (fout == NULL || buffer == NULL) {
+    return 0;
+  } else {
+    const int width = buffer->width;
+    const int height = buffer->height;
+    const WebPYUVABuffer* const yuv = &buffer->u.YUVA;
+    const uint8_t* src_y = yuv->y;
+    const uint8_t* src_u = yuv->u;
+    const uint8_t* src_v = yuv->v;
+    const uint8_t* src_a = yuv->a;
+    const int uv_width = (width + 1) / 2;
+    const int uv_height = (height + 1) / 2;
+    const int a_height = (src_a != NULL) ? height : 0;
+    int ok = 1;
+    int y;
+
+    if (src_y == NULL || src_u == NULL || src_v == NULL) return 0;
+
+    fprintf(fout, "P5\n%d %d\n255\n",
+            (width + 1) & ~1, height + uv_height + a_height);
+    for (y = 0; ok && y < height; ++y) {
+      ok &= (fwrite(src_y, width, 1, fout) == 1);
+      if (width & 1) fputc(0, fout);    // padding byte
+      src_y += yuv->y_stride;
+    }
+    for (y = 0; ok && y < uv_height; ++y) {
+      ok &= (fwrite(src_u, uv_width, 1, fout) == 1);
+      ok &= (fwrite(src_v, uv_width, 1, fout) == 1);
+      src_u += yuv->u_stride;
+      src_v += yuv->v_stride;
+    }
+    for (y = 0; ok && y < a_height; ++y) {
+      ok &= (fwrite(src_a, width, 1, fout) == 1);
+      if (width & 1) fputc(0, fout);    // padding byte
+      src_a += yuv->a_stride;
+    }
+    return ok;
+  }
+}
+
+//------------------------------------------------------------------------------
+// Raw YUV(A) planes
+
+int WebPWriteYUV(FILE* fout, const WebPDecBuffer* const buffer) {
+  if (fout == NULL || buffer == NULL) {
+    return 0;
+  } else {
+    const int width = buffer->width;
+    const int height = buffer->height;
+    const WebPYUVABuffer* const yuv = &buffer->u.YUVA;
+    const uint8_t* src_y = yuv->y;
+    const uint8_t* src_u = yuv->u;
+    const uint8_t* src_v = yuv->v;
+    const uint8_t* src_a = yuv->a;
+    const int uv_width = (width + 1) / 2;
+    const int uv_height = (height + 1) / 2;
+    const int a_height = (src_a != NULL) ? height : 0;
+    int ok = 1;
+    int y;
+
+    if (src_y == NULL || src_u == NULL || src_v == NULL) return 0;
+
+    for (y = 0; ok && y < height; ++y) {
+      ok &= (fwrite(src_y, width, 1, fout) == 1);
+      src_y += yuv->y_stride;
+    }
+    for (y = 0; ok && y < uv_height; ++y) {
+      ok &= (fwrite(src_u, uv_width, 1, fout) == 1);
+      src_u += yuv->u_stride;
+    }
+    for (y = 0; ok && y < uv_height; ++y) {
+      ok &= (fwrite(src_v, uv_width, 1, fout) == 1);
+      src_v += yuv->v_stride;
+    }
+    for (y = 0; ok && y < a_height; ++y) {
+      ok &= (fwrite(src_a, width, 1, fout) == 1);
+      src_a += yuv->a_stride;
+    }
+    return ok;
+  }
+}
+
+//------------------------------------------------------------------------------
+// Generic top-level call
+
+int WebPSaveImage(const WebPDecBuffer* const buffer,
+                  WebPOutputFileFormat format, const char* const out_file) {
+  FILE* fout = NULL;
+  int needs_open_file = 1;
+  const int use_stdout = (out_file != NULL) && !strcmp(out_file, "-");
+  int ok = 1;
+
+  if (buffer == NULL || out_file == NULL) return 0;
+
+#ifdef HAVE_WINCODEC_H
+  needs_open_file = (format != PNG);
+#endif
+
+  if (needs_open_file) {
+    fout = use_stdout ? ImgIoUtilSetBinaryMode(stdout) : fopen(out_file, "wb");
+    if (fout == NULL) {
+      fprintf(stderr, "Error opening output file %s\n", out_file);
+      return 0;
+    }
+  }
+
+  if (format == PNG ||
+      format == RGBA || format == BGRA || format == ARGB ||
+      format == rgbA || format == bgrA || format == Argb) {
+#ifdef HAVE_WINCODEC_H
+    ok &= WebPWritePNG(out_file, use_stdout, buffer);
+#else
+    ok &= WebPWritePNG(fout, buffer);
+#endif
+  } else if (format == PAM) {
+    ok &= WebPWritePAM(fout, buffer);
+  } else if (format == PPM || format == RGB || format == BGR) {
+    ok &= WebPWritePPM(fout, buffer);
+  } else if (format == RGBA_4444 || format == RGB_565 || format == rgbA_4444) {
+    ok &= WebPWrite16bAsPGM(fout, buffer);
+  } else if (format == BMP) {
+    ok &= WebPWriteBMP(fout, buffer);
+  } else if (format == TIFF) {
+    ok &= WebPWriteTIFF(fout, buffer);
+  } else if (format == RAW_YUV) {
+    ok &= WebPWriteYUV(fout, buffer);
+  } else if (format == PGM || format == YUV || format == YUVA) {
+    ok &= WebPWritePGM(fout, buffer);
+  } else if (format == ALPHA_PLANE_ONLY) {
+    ok &= WebPWriteAlphaPlane(fout, buffer);
+  }
+  if (fout != NULL && fout != stdout) {
+    fclose(fout);
+  }
+  return ok;
+}

imageio/image_enc.h

@@ -0,0 +1,96 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  All-in-one library to save PNG/JPEG/WebP/TIFF/WIC images.
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#ifndef WEBP_IMAGEIO_IMAGE_ENC_H_
+#define WEBP_IMAGEIO_IMAGE_ENC_H_
+
+#include <stdio.h>
+
+#ifdef HAVE_CONFIG_H
+#include "webp/config.h"
+#endif
+
+#include "webp/types.h"
+#include "webp/decode.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Output types
+typedef enum {
+  PNG = 0,
+  PAM,
+  PPM,
+  PGM,
+  BMP,
+  TIFF,
+  RAW_YUV,
+  ALPHA_PLANE_ONLY,  // this is for experimenting only
+  // forced colorspace output (for testing, mostly)
+  RGB, RGBA, BGR, BGRA, ARGB,
+  RGBA_4444, RGB_565,
+  rgbA, bgrA, Argb, rgbA_4444,
+  YUV, YUVA
+} WebPOutputFileFormat;
+
+// General all-purpose call.
+// Most formats expect a 'buffer' containing RGBA-like samples, except
+// RAW_YUV, YUV and YUVA formats.
+// If 'out_file_name' is "-", data is saved to stdout.
+// Returns false if an error occurred, true otherwise.
+int WebPSaveImage(const WebPDecBuffer* const buffer,
+                  WebPOutputFileFormat format, const char* const out_file_name);
+
+// Save to PNG.
+#ifdef HAVE_WINCODEC_H
+int WebPWritePNG(const char* out_file_name, int use_stdout,
+                 const struct WebPDecBuffer* const buffer);
+#else
+int WebPWritePNG(FILE* out_file, const WebPDecBuffer* const buffer);
+#endif
+
+// Save to PPM format (RGB, no alpha)
+int WebPWritePPM(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save to PAM format (= PPM + alpha)
+int WebPWritePAM(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save 16b mode (RGBA4444, RGB565, ...) for debugging purposes.
+int WebPWrite16bAsPGM(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save as BMP
+int WebPWriteBMP(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save as TIFF
+int WebPWriteTIFF(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save the ALPHA plane (only) as a PGM
+int WebPWriteAlphaPlane(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save as YUV samples as PGM format (using IMC4 layout).
+// See: http://www.fourcc.org/yuv.php#IMC4.
+// (very convenient format for viewing the samples, esp. for odd dimensions).
+int WebPWritePGM(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save YUV(A) planes sequentially (raw dump)
+int WebPWriteYUV(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+// Save 16b mode (RGBA4444, RGB565, ...) as PGM format, for debugging purposes.
+int WebPWrite16bAsPGM(FILE* fout, const struct WebPDecBuffer* const buffer);
+
+#ifdef __cplusplus
+}    // extern "C"
+#endif
+
+#endif  // WEBP_IMAGEIO_IMAGE_ENC_H_

imageio/imageio_util.c

@@ -0,0 +1,143 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  Utility functions used by the image decoders.
+//
+
+#include "./imageio_util.h"
+
+#if defined(_WIN32)
+#include <fcntl.h>   // for _O_BINARY
+#include <io.h>      // for _setmode()
+#endif
+#include <stdlib.h>
+#include <string.h>
+
+// -----------------------------------------------------------------------------
+// File I/O
+
+FILE* ImgIoUtilSetBinaryMode(FILE* file) {
+#if defined(_WIN32)
+  if (_setmode(_fileno(file), _O_BINARY) == -1) {
+    fprintf(stderr, "Failed to reopen file in O_BINARY mode.\n");
+    return NULL;
+  }
+#endif
+  return file;
+}
+
+int ImgIoUtilReadFromStdin(const uint8_t** data, size_t* data_size) {
+  static const size_t kBlockSize = 16384;  // default initial size
+  size_t max_size = 0;
+  size_t size = 0;
+  uint8_t* input = NULL;
+
+  if (data == NULL || data_size == NULL) return 0;
+  *data = NULL;
+  *data_size = 0;
+
+  if (!ImgIoUtilSetBinaryMode(stdin)) return 0;
+
+  while (!feof(stdin)) {
+    // We double the buffer size each time and read as much as possible.
+    const size_t extra_size = (max_size == 0) ? kBlockSize : max_size;
+    void* const new_data = realloc(input, max_size + extra_size);
+    if (new_data == NULL) goto Error;
+    input = (uint8_t*)new_data;
+    max_size += extra_size;
+    size += fread(input + size, 1, extra_size, stdin);
+    if (size < max_size) break;
+  }
+  if (ferror(stdin)) goto Error;
+  *data = input;
+  *data_size = size;
+  return 1;
+
+ Error:
+  free(input);
+  fprintf(stderr, "Could not read from stdin\n");
+  return 0;
+}
+
+int ImgIoUtilReadFile(const char* const file_name,
+                      const uint8_t** data, size_t* data_size) {
+  int ok;
+  void* file_data;
+  size_t file_size;
+  FILE* in;
+  const int from_stdin = (file_name == NULL) || !strcmp(file_name, "-");
+
+  if (from_stdin) return ImgIoUtilReadFromStdin(data, data_size);
+
+  if (data == NULL || data_size == NULL) return 0;
+  *data = NULL;
+  *data_size = 0;
+
+  in = fopen(file_name, "rb");
+  if (in == NULL) {
+    fprintf(stderr, "cannot open input file '%s'\n", file_name);
+    return 0;
+  }
+  fseek(in, 0, SEEK_END);
+  file_size = ftell(in);
+  fseek(in, 0, SEEK_SET);
+  file_data = malloc(file_size);
+  if (file_data == NULL) return 0;
+  ok = (fread(file_data, file_size, 1, in) == 1);
+  fclose(in);
+
+  if (!ok) {
+    fprintf(stderr, "Could not read %d bytes of data from file %s\n",
+            (int)file_size, file_name);
+    free(file_data);
+    return 0;
+  }
+  *data = (uint8_t*)file_data;
+  *data_size = file_size;
+  return 1;
+}
+
+int ImgIoUtilWriteFile(const char* const file_name,
+                       const uint8_t* data, size_t data_size) {
+  int ok;
+  FILE* out;
+  const int to_stdout = (file_name == NULL) || !strcmp(file_name, "-");
+
+  if (data == NULL) {
+    return 0;
+  }
+  out = to_stdout ? ImgIoUtilSetBinaryMode(stdout) : fopen(file_name, "wb");
+  if (out == NULL) {
+    fprintf(stderr, "Error! Cannot open output file '%s'\n", file_name);
+    return 0;
+  }
+  ok = (fwrite(data, data_size, 1, out) == 1);
+  if (out != stdout) fclose(out);
+  return ok;
+}
+
+// -----------------------------------------------------------------------------
+
+void ImgIoUtilCopyPlane(const uint8_t* src, int src_stride,
+                        uint8_t* dst, int dst_stride, int width, int height) {
+  while (height-- > 0) {
+    memcpy(dst, src, width * sizeof(*dst));
+    src += src_stride;
+    dst += dst_stride;
+  }
+}
+
+// -----------------------------------------------------------------------------
+
+int ImgIoUtilCheckSizeArgumentsOverflow(uint64_t nmemb, size_t size) {
+  const uint64_t total_size = nmemb * size;
+  return (total_size == (size_t)total_size);
+}
+
+// -----------------------------------------------------------------------------

imageio/imageio_util.h

@@ -0,0 +1,61 @@
+// Copyright 2016 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+//  Utility functions used by the image decoders.
+//
+
+#ifndef WEBP_IMAGEIO_IMAGEIO_UTIL_H_
+#define WEBP_IMAGEIO_IMAGEIO_UTIL_H_
+
+#include <stdio.h>
+#include "webp/types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//------------------------------------------------------------------------------
+// File I/O
+
+// Reopen file in binary (O_BINARY) mode.
+// Returns 'file' on success, NULL otherwise.
+FILE* ImgIoUtilSetBinaryMode(FILE* file);
+
+// Allocates storage for entire file 'file_name' and returns contents and size
+// in 'data' and 'data_size'. Returns 1 on success, 0 otherwise. '*data' should
+// be deleted using free().
+// If 'file_name' is NULL or equal to "-", input is read from stdin by calling
+// the function ImgIoUtilReadFromStdin().
+int ImgIoUtilReadFile(const char* const file_name,
+                      const uint8_t** data, size_t* data_size);
+
+// Same as ImgIoUtilReadFile(), but reads until EOF from stdin instead.
+int ImgIoUtilReadFromStdin(const uint8_t** data, size_t* data_size);
+
+// Write a data segment into a file named 'file_name'. Returns true if ok.
+// If 'file_name' is NULL or equal to "-", output is written to stdout.
+int ImgIoUtilWriteFile(const char* const file_name,
+                       const uint8_t* data, size_t data_size);
+
+//------------------------------------------------------------------------------
+
+// Copy width x height pixels from 'src' to 'dst' honoring the strides.
+void ImgIoUtilCopyPlane(const uint8_t* src, int src_stride,
+                        uint8_t* dst, int dst_stride, int width, int height);
+
+//------------------------------------------------------------------------------
+
+// Returns 0 in case of overflow of nmemb * size.
+int ImgIoUtilCheckSizeArgumentsOverflow(uint64_t nmemb, size_t size);
+
+#ifdef __cplusplus
+}    // extern "C"
+#endif
+
+#endif  // WEBP_IMAGEIO_IMAGEIO_UTIL_H_

imageio/jpegdec.c

@@ -25,7 +25,7 @@
 #include <string.h>
 
 #include "webp/encode.h"
-#include "./example_util.h"
+#include "./imageio_util.h"
 #include "./metadata.h"
 
 // -----------------------------------------------------------------------------
@@ -266,6 +266,8 @@ int ReadJPEG(const uint8_t* const data, size_t data_size,
   JSAMPROW buffer[1];
   JPEGReadContext ctx;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
   (void)keep_alpha;
   memset(&ctx, 0, sizeof(ctx));
   ctx.data = data;

imageio/jpegdec.h

@@ -9,10 +9,9 @@
 //
 // JPEG decode.
 
-#ifndef WEBP_EXAMPLES_JPEGDEC_H_
-#define WEBP_EXAMPLES_JPEGDEC_H_
+#ifndef WEBP_IMAGEIO_JPEGDEC_H_
+#define WEBP_IMAGEIO_JPEGDEC_H_
 
-#include <stdio.h>
 #include "webp/types.h"
 
 #ifdef __cplusplus
@@ -35,4 +34,4 @@ int ReadJPEG(const uint8_t* const data, size_t data_size,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_JPEGDEC_H_
+#endif  // WEBP_IMAGEIO_JPEGDEC_H_

imageio/metadata.h

@@ -10,8 +10,8 @@
 //  Metadata types and functions.
 //
 
-#ifndef WEBP_EXAMPLES_METADATA_H_
-#define WEBP_EXAMPLES_METADATA_H_
+#ifndef WEBP_IMAGEIO_METADATA_H_
+#define WEBP_IMAGEIO_METADATA_H_
 
 #include "webp/types.h"
 
@@ -44,4 +44,4 @@ int MetadataCopy(const char* metadata, size_t metadata_len,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_METADATA_H_
+#endif  // WEBP_IMAGEIO_METADATA_H_

imageio/pngdec.c

@@ -24,7 +24,7 @@
 #include <string.h>
 
 #include "webp/encode.h"
-#include "./example_util.h"
+#include "./imageio_util.h"
 #include "./metadata.h"
 
 static void PNGAPI error_function(png_structp png, png_const_charp error) {
@@ -220,6 +220,8 @@ int ReadPNG(const uint8_t* const data, size_t data_size,
   int64_t stride;
   uint8_t* volatile rgb = NULL;
 
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
   context.data = data;
   context.data_size = data_size;
 
@@ -280,9 +282,10 @@ int ReadPNG(const uint8_t* const data, size_t data_size,
   rgb = (uint8_t*)malloc((size_t)stride * height);
   if (rgb == NULL) goto Error;
   for (p = 0; p < num_passes; ++p) {
+    png_bytep row = rgb;
     for (y = 0; y < height; ++y) {
-      png_bytep row = (png_bytep)(rgb + y * stride);
       png_read_rows(png, &row, NULL, 1);
+      row += stride;
     }
   }
   png_read_end(png, end_info);

imageio/pngdec.h

@@ -9,8 +9,8 @@
 //
 // PNG decode.
 
-#ifndef WEBP_EXAMPLES_PNGDEC_H_
-#define WEBP_EXAMPLES_PNGDEC_H_
+#ifndef WEBP_IMAGEIO_PNGDEC_H_
+#define WEBP_IMAGEIO_PNGDEC_H_
 
 #include "webp/types.h"
 
@@ -34,4 +34,4 @@ int ReadPNG(const uint8_t* const data, size_t data_size,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_PNGDEC_H_
+#endif  // WEBP_IMAGEIO_PNGDEC_H_

imageio/pnmdec.c

@@ -0,0 +1,252 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// (limited) PNM decoder
+
+#include "./pnmdec.h"
+
+#include <assert.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "webp/encode.h"
+#include "./imageio_util.h"
+
+typedef enum {
+  WIDTH_FLAG      = 1 << 0,
+  HEIGHT_FLAG     = 1 << 1,
+  DEPTH_FLAG      = 1 << 2,
+  MAXVAL_FLAG     = 1 << 3,
+  TUPLE_FLAG      = 1 << 4,
+  ALL_NEEDED_FLAGS = 0x1f
+} PNMFlags;
+
+typedef struct {
+  const uint8_t* data;
+  size_t data_size;
+  int width, height;
+  int bytes_per_px;   // 1, 3, 4
+  int depth;
+  int max_value;
+  int type;           // 5, 6 or 7
+  int seen_flags;
+} PNMInfo;
+
+// -----------------------------------------------------------------------------
+// PNM decoding
+
+#define MAX_LINE_SIZE 1024
+static const size_t kMinPNMHeaderSize = 3;
+
+static size_t ReadLine(const uint8_t* const data, size_t off, size_t data_size,
+                       char out[MAX_LINE_SIZE + 1], size_t* const out_size) {
+  size_t i = 0;
+  *out_size = 0;
+ redo:
+  for (i = 0; i < MAX_LINE_SIZE && off < data_size; ++i) {
+    out[i] = data[off++];
+    if (out[i] == '\n') break;
+  }
+  if (off < data_size) {
+    if (i == 0) goto redo;         // empty line
+    if (out[0] == '#') goto redo;  // skip comment
+  }
+  out[i] = 0;   // safety sentinel
+  *out_size = i;
+  return off;
+}
+
+static size_t FlagError(const char flag[]) {
+  fprintf(stderr, "PAM header error: flags '%s' already seen.\n", flag);
+  return 0;
+}
+
+// inspired from http://netpbm.sourceforge.net/doc/pam.html
+static size_t ReadPAMFields(PNMInfo* const info, size_t off) {
+  char out[MAX_LINE_SIZE + 1];
+  size_t out_size;
+  int tmp;
+  assert(info != NULL);
+  while (1) {
+    off = ReadLine(info->data, off, info->data_size, out, &out_size);
+    if (off == 0) return 0;
+    if (sscanf(out, "WIDTH %d", &tmp) == 1) {
+      if (info->seen_flags & WIDTH_FLAG) return FlagError("WIDTH");
+      info->seen_flags |= WIDTH_FLAG;
+      info->width = tmp;
+    } else if (sscanf(out, "HEIGHT %d", &tmp) == 1) {
+      if (info->seen_flags & HEIGHT_FLAG) return FlagError("HEIGHT");
+      info->seen_flags |= HEIGHT_FLAG;
+      info->height = tmp;
+    } else if (sscanf(out, "DEPTH %d", &tmp) == 1) {
+      if (info->seen_flags & DEPTH_FLAG) return FlagError("DEPTH");
+      info->seen_flags |= DEPTH_FLAG;
+      info->depth = tmp;
+    } else if (sscanf(out, "MAXVAL %d", &tmp) == 1) {
+      if (info->seen_flags & MAXVAL_FLAG) return FlagError("MAXVAL");
+      info->seen_flags |= MAXVAL_FLAG;
+      info->max_value = tmp;
+    } else if (!strcmp(out, "TUPLTYPE RGB_ALPHA")) {
+      info->bytes_per_px = 4;
+      info->seen_flags |= TUPLE_FLAG;
+    } else if (!strcmp(out, "TUPLTYPE RGB")) {
+      info->bytes_per_px = 3;
+      info->seen_flags |= TUPLE_FLAG;
+    } else if (!strcmp(out, "TUPLTYPE GRAYSCALE")) {
+      info->bytes_per_px = 1;
+      info->seen_flags |= TUPLE_FLAG;
+    } else if (!strcmp(out, "ENDHDR")) {
+      break;
+    } else {
+      static const char kEllipsis[] = " ...";
+      int i;
+      if (out_size > 20) sprintf(out + 20 - strlen(kEllipsis), kEllipsis);
+      for (i = 0; i < (int)strlen(out); ++i) {
+        if (!isprint(out[i])) out[i] = ' ';
+      }
+      fprintf(stderr, "PAM header error: unrecognized entry [%s]\n", out);
+      return 0;
+    }
+  }
+  if (!(info->seen_flags & TUPLE_FLAG)) {
+    info->seen_flags |= TUPLE_FLAG;
+    info->bytes_per_px = info->depth * (info->max_value > 255 ? 2 : 1);
+  }
+  if (info->seen_flags != ALL_NEEDED_FLAGS) {
+    fprintf(stderr, "PAM: incomplete header.\n");
+    return 0;
+  }
+  return off;
+}
+
+static size_t ReadHeader(PNMInfo* const info) {
+  size_t off = 0;
+  char out[MAX_LINE_SIZE + 1];
+  size_t out_size;
+  if (info == NULL) return 0;
+  if (info->data == NULL || info->data_size < kMinPNMHeaderSize) return 0;
+
+  info->width = info->height = 0;
+  info->type = -1;
+  info->seen_flags = 0;
+  info->bytes_per_px = 0;
+  info->depth = 0;
+  info->max_value = 0;
+
+  off = ReadLine(info->data, off, info->data_size, out, &out_size);
+  if (off == 0 || sscanf(out, "P%d", &info->type) != 1) return 0;
+  if (info->type == 7) {
+    off = ReadPAMFields(info, off);
+  } else {
+    off = ReadLine(info->data, off, info->data_size, out, &out_size);
+    if (off == 0 || sscanf(out, "%d %d", &info->width, &info->height) != 2) {
+      return 0;
+    }
+    off = ReadLine(info->data, off, info->data_size, out, &out_size);
+    if (off == 0 || sscanf(out, "%d", &info->max_value) != 1) return 0;
+
+    // finish initializing missing fields
+    info->depth = (info->type == 5) ? 1 : 3;
+    info->bytes_per_px = info->depth * (info->max_value > 255 ? 2 : 1);
+  }
+  // perform some basic numerical validation
+  if (info->width <= 0 || info->height <= 0 ||
+      info->type <= 0 || info->type >= 9 ||
+      info->depth <= 0 || info->depth > 4 ||
+      info->bytes_per_px < info->depth ||
+      info->max_value <= 0 || info->max_value >= 65536) {
+    return 0;
+  }
+  return off;
+}
+
+int ReadPNM(const uint8_t* const data, size_t data_size,
+            WebPPicture* const pic, int keep_alpha,
+            struct Metadata* const metadata) {
+  int ok = 0;
+  int i, j;
+  uint64_t stride, pixel_bytes;
+  uint8_t* rgb = NULL, *tmp_rgb;
+  size_t offset;
+  PNMInfo info;
+
+  info.data = data;
+  info.data_size = data_size;
+  offset = ReadHeader(&info);
+  if (offset == 0) {
+    fprintf(stderr, "Error parsing PNM header.\n");
+    goto End;
+  }
+
+  if (info.type < 5 || info.type > 7) {
+    fprintf(stderr, "Unsupported P%d PNM format.\n", info.type);
+    goto End;
+  }
+
+  // Some basic validations.
+  if (pic == NULL) goto End;
+  if (info.width > WEBP_MAX_DIMENSION || info.height > WEBP_MAX_DIMENSION) {
+    fprintf(stderr, "Invalid %dx%d dimension for PNM\n",
+                    info.width, info.height);
+    goto End;
+  }
+
+  pixel_bytes = (uint64_t)info.width * info.height * info.bytes_per_px;
+  if (data_size < offset + pixel_bytes) {
+    fprintf(stderr, "Truncated PNM file (P%d).\n", info.type);
+    goto End;
+  }
+  stride =
+      (uint64_t)(info.bytes_per_px < 3 ? 3 : info.bytes_per_px) * info.width;
+  if (stride != (size_t)stride ||
+      !ImgIoUtilCheckSizeArgumentsOverflow(stride, info.height)) {
+    goto End;
+  }
+
+  rgb = (uint8_t*)malloc((size_t)stride * info.height);
+  if (rgb == NULL) goto End;
+
+  // Convert input
+  tmp_rgb = rgb;
+  for (j = 0; j < info.height; ++j) {
+    assert(offset + info.bytes_per_px * info.width <= data_size);
+    if (info.depth == 1) {
+      // convert grayscale -> RGB
+      for (i = 0; i < info.width; ++i) {
+        const uint8_t v = data[offset + i];
+        tmp_rgb[3 * i + 0] = tmp_rgb[3 * i + 1] = tmp_rgb[3 * i + 2] = v;
+      }
+    } else if (info.depth == 3) {   // RGB
+      memcpy(tmp_rgb, data + offset, 3 * info.width * sizeof(*data));
+    } else if (info.depth == 4) {   // RGBA
+      memcpy(tmp_rgb, data + offset, 4 * info.width * sizeof(*data));
+    }
+    offset += info.bytes_per_px * info.width;
+    tmp_rgb += stride;
+  }
+
+  // WebP conversion.
+  pic->width = info.width;
+  pic->height = info.height;
+  ok = (info.depth == 4) ? WebPPictureImportRGBA(pic, rgb, (int)stride)
+                         : WebPPictureImportRGB(pic, rgb, (int)stride);
+  if (!ok) goto End;
+
+  ok = 1;
+ End:
+  free((void*)rgb);
+
+  (void)metadata;
+  (void)keep_alpha;
+  return ok;
+}
+
+// -----------------------------------------------------------------------------

imageio/pnmdec.h

@@ -0,0 +1,37 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// partial PNM format decoder (ppm/pgm)
+
+#ifndef WEBP_IMAGEIO_PNMDEC_H_
+#define WEBP_IMAGEIO_PNMDEC_H_
+
+#include "webp/types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Metadata;
+struct WebPPicture;
+
+// Reads a PNM file from 'data', returning the decoded output in 'pic'.
+// The output is RGB or YUV depending on pic->use_argb value.
+// Returns true on success.
+// 'metadata' has no effect, but is kept for coherence with other signatures
+// for image readers.
+int ReadPNM(const uint8_t* const data, size_t data_size,
+            struct WebPPicture* const pic, int keep_alpha,
+            struct Metadata* const metadata);
+
+#ifdef __cplusplus
+}    // extern "C"
+#endif
+
+#endif  // WEBP_IMAGEIO_PNMDEC_H_

imageio/tiffdec.c

@@ -15,6 +15,7 @@
 #include "webp/config.h"
 #endif
 
+#include <limits.h>
 #include <stdio.h>
 #include <string.h>
 
@@ -22,7 +23,7 @@
 #include <tiffio.h>
 
 #include "webp/encode.h"
-#include "./example_util.h"
+#include "./imageio_util.h"
 #include "./metadata.h"
 
 static const struct {
@@ -107,7 +108,7 @@ static void MyUnmapFile(thandle_t opaque, void* base, toff_t size) {
 static tsize_t MyRead(thandle_t opaque, void* dst, tsize_t size) {
   MyData* const my_data = (MyData*)opaque;
   if (my_data->pos + size > my_data->size) {
-    size = my_data->size - my_data->pos;
+    size = (tsize_t)(my_data->size - my_data->pos);
   }
   if (size > 0) {
     memcpy(dst, my_data->data + my_data->pos, size);
@@ -116,19 +117,59 @@ static tsize_t MyRead(thandle_t opaque, void* dst, tsize_t size) {
   return size;
 }
 
+// Unmultiply Argb data. Taken from dsp/alpha_processing
+// (we don't want to force a dependency to a libdspdec library).
+#define MFIX 24    // 24bit fixed-point arithmetic
+#define HALF ((1u << MFIX) >> 1)
+#define KINV_255 ((1u << MFIX) / 255u)
+
+static uint32_t Unmult(uint8_t x, uint32_t mult) {
+  const uint32_t v = (x * mult + HALF) >> MFIX;
+  return (v > 255u) ? 255u : v;
+}
+
+static WEBP_INLINE uint32_t GetScale(uint32_t a) {
+  return (255u << MFIX) / a;
+}
+
+static void MultARGBRow(uint8_t* ptr, int width) {
+  int x;
+  for (x = 0; x < width; ++x, ptr += 4) {
+    const uint32_t alpha = ptr[3];
+    if (alpha < 255) {
+      if (alpha == 0) {   // alpha == 0
+        ptr[0] = ptr[1] = ptr[2] = 0;
+      } else {
+        const uint32_t scale = GetScale(alpha);
+        ptr[0] = Unmult(ptr[0], scale);
+        ptr[1] = Unmult(ptr[1], scale);
+        ptr[2] = Unmult(ptr[2], scale);
+      }
+    }
+  }
+}
+
 int ReadTIFF(const uint8_t* const data, size_t data_size,
              WebPPicture* const pic, int keep_alpha,
              Metadata* const metadata) {
   MyData my_data = { data, (toff_t)data_size, 0 };
-  TIFF* const tif = TIFFClientOpen("Memory", "r", &my_data,
-                                   MyRead, MyRead, MySeek, MyClose,
-                                   MySize, MyMapFile, MyUnmapFile);
-  uint32 width, height;
-  uint32* raster;
+  TIFF* tif;
+  uint32_t width, height;
+  uint16_t samples_per_px = 0;
+  uint16_t extra_samples = 0;
+  uint16_t* extra_samples_ptr = NULL;
+  uint32_t* raster;
   int64_t alloc_size;
   int ok = 0;
   tdir_t dircount;
 
+  if (data == NULL || data_size == 0 || data_size > INT_MAX || pic == NULL) {
+    return 0;
+  }
+
+  tif = TIFFClientOpen("Memory", "r", &my_data,
+                       MyRead, MyRead, MySeek, MyClose,
+                       MySize, MyMapFile, MyUnmapFile);
   if (tif == NULL) {
     fprintf(stderr, "Error! Cannot parse TIFF file\n");
     return 0;
@@ -140,17 +181,27 @@ int ReadTIFF(const uint8_t* const data, size_t data_size,
                     "Only the first will be used, %d will be ignored.\n",
                     dircount - 1);
   }
+  if (!TIFFGetFieldDefaulted(tif, TIFFTAG_SAMPLESPERPIXEL, &samples_per_px)) {
+    fprintf(stderr, "Error! Cannot retrieve TIFF samples-per-pixel info.\n");
+    goto End;
+  }
+  if (samples_per_px < 3 || samples_per_px > 4) goto End;  // not supported
 
   if (!(TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width) &&
         TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height))) {
     fprintf(stderr, "Error! Cannot retrieve TIFF image dimensions.\n");
     goto End;
   }
-
   if (!ImgIoUtilCheckSizeArgumentsOverflow((uint64_t)width * height,
                                            sizeof(*raster))) {
     goto End;
   }
+  if (samples_per_px > 3 && !TIFFGetField(tif, TIFFTAG_EXTRASAMPLES,
+                                          &extra_samples, &extra_samples_ptr)) {
+    fprintf(stderr, "Error! Cannot retrieve TIFF ExtraSamples info.\n");
+    goto End;
+  }
+
   // _Tiffmalloc uses a signed type for size.
   alloc_size = (int64_t)((uint64_t)width * height * sizeof(*raster));
   if (alloc_size < 0 || alloc_size != (tsize_t)alloc_size) goto End;
@@ -166,6 +217,16 @@ int ReadTIFF(const uint8_t* const data, size_t data_size,
 #ifdef WORDS_BIGENDIAN
       TIFFSwabArrayOfLong(raster, width * height);
 #endif
+      // if we have an alpha channel, we must un-multiply from rgbA to RGBA
+      if (extra_samples == 1 && extra_samples_ptr != NULL &&
+          extra_samples_ptr[0] == EXTRASAMPLE_ASSOCALPHA) {
+        uint32_t y;
+        uint8_t* tmp = (uint8_t*)raster;
+        for (y = 0; y < height; ++y) {
+          MultARGBRow(tmp, width);
+          tmp += stride;
+        }
+      }
       ok = keep_alpha
          ? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
          : WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);

imageio/tiffdec.h

@@ -9,8 +9,8 @@
 //
 // TIFF decode.
 
-#ifndef WEBP_EXAMPLES_TIFFDEC_H_
-#define WEBP_EXAMPLES_TIFFDEC_H_
+#ifndef WEBP_IMAGEIO_TIFFDEC_H_
+#define WEBP_IMAGEIO_TIFFDEC_H_
 
 #include "webp/types.h"
 
@@ -34,4 +34,4 @@ int ReadTIFF(const uint8_t* const data, size_t data_size,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_TIFFDEC_H_
+#endif  // WEBP_IMAGEIO_TIFFDEC_H_

imageio/webpdec.c

@@ -0,0 +1,197 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// WebP decode.
+
+#include "./webpdec.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "webp/decode.h"
+#include "webp/encode.h"
+#include "./imageio_util.h"
+#include "./metadata.h"
+
+//------------------------------------------------------------------------------
+// WebP decoding
+
+static const char* const kStatusMessages[VP8_STATUS_NOT_ENOUGH_DATA + 1] = {
+  "OK", "OUT_OF_MEMORY", "INVALID_PARAM", "BITSTREAM_ERROR",
+  "UNSUPPORTED_FEATURE", "SUSPENDED", "USER_ABORT", "NOT_ENOUGH_DATA"
+};
+
+static void PrintAnimationWarning(const WebPDecoderConfig* const config) {
+  if (config->input.has_animation) {
+    fprintf(stderr,
+            "Error! Decoding of an animated WebP file is not supported.\n"
+            "       Use webpmux to extract the individual frames or\n"
+            "       vwebp to view this image.\n");
+  }
+}
+
+void PrintWebPError(const char* const in_file, int status) {
+  fprintf(stderr, "Decoding of %s failed.\n", in_file);
+  fprintf(stderr, "Status: %d", status);
+  if (status >= VP8_STATUS_OK && status <= VP8_STATUS_NOT_ENOUGH_DATA) {
+    fprintf(stderr, "(%s)", kStatusMessages[status]);
+  }
+  fprintf(stderr, "\n");
+}
+
+int LoadWebP(const char* const in_file,
+             const uint8_t** data, size_t* data_size,
+             WebPBitstreamFeatures* bitstream) {
+  VP8StatusCode status;
+  WebPBitstreamFeatures local_features;
+  if (!ImgIoUtilReadFile(in_file, data, data_size)) return 0;
+
+  if (bitstream == NULL) {
+    bitstream = &local_features;
+  }
+
+  status = WebPGetFeatures(*data, *data_size, bitstream);
+  if (status != VP8_STATUS_OK) {
+    free((void*)*data);
+    *data = NULL;
+    *data_size = 0;
+    PrintWebPError(in_file, status);
+    return 0;
+  }
+  return 1;
+}
+
+//------------------------------------------------------------------------------
+
+VP8StatusCode DecodeWebP(const uint8_t* const data, size_t data_size,
+                         WebPDecoderConfig* const config) {
+  if (config == NULL) return VP8_STATUS_INVALID_PARAM;
+  PrintAnimationWarning(config);
+  return WebPDecode(data, data_size, config);
+}
+
+VP8StatusCode DecodeWebPIncremental(
+    const uint8_t* const data, size_t data_size,
+    WebPDecoderConfig* const config) {
+  VP8StatusCode status = VP8_STATUS_OK;
+  if (config == NULL) return VP8_STATUS_INVALID_PARAM;
+
+  PrintAnimationWarning(config);
+
+  // Decoding call.
+  {
+    WebPIDecoder* const idec = WebPIDecode(data, data_size, config);
+    if (idec == NULL) {
+      fprintf(stderr, "Failed during WebPINewDecoder().\n");
+      return VP8_STATUS_OUT_OF_MEMORY;
+    } else {
+#ifdef WEBP_EXPERIMENTAL_FEATURES
+      size_t size = 0;
+      const size_t incr = 2 + (data_size / 20);
+      while (size < data_size) {
+        size_t next_size = size + (rand() % incr);
+        if (next_size > data_size) next_size = data_size;
+        status = WebPIUpdate(idec, data, next_size);
+        if (status != VP8_STATUS_OK && status != VP8_STATUS_SUSPENDED) break;
+        size = next_size;
+      }
+#else
+      status = WebPIUpdate(idec, data, data_size);
+#endif
+      WebPIDelete(idec);
+    }
+  }
+  return status;
+}
+
+// -----------------------------------------------------------------------------
+
+int ReadWebP(const uint8_t* const data, size_t data_size,
+             WebPPicture* const pic,
+             int keep_alpha, Metadata* const metadata) {
+  int ok = 0;
+  VP8StatusCode status = VP8_STATUS_OK;
+  WebPDecoderConfig config;
+  WebPDecBuffer* const output_buffer = &config.output;
+  WebPBitstreamFeatures* const bitstream = &config.input;
+
+  if (data == NULL || data_size == 0 || pic == NULL) return 0;
+
+  // TODO(jzern): add Exif/XMP/ICC extraction.
+  if (metadata != NULL) {
+    fprintf(stderr, "Warning: metadata extraction from WebP is unsupported.\n");
+  }
+
+  if (!WebPInitDecoderConfig(&config)) {
+    fprintf(stderr, "Library version mismatch!\n");
+    return 0;
+  }
+
+  status = WebPGetFeatures(data, data_size, bitstream);
+  if (status != VP8_STATUS_OK) {
+    PrintWebPError("input data", status);
+    return 0;
+  }
+
+  do {
+    const int has_alpha = keep_alpha && bitstream->has_alpha;
+    pic->width = bitstream->width;
+    pic->height = bitstream->height;
+    if (!pic->use_argb) pic->colorspace = has_alpha ? WEBP_YUV420A
+                                                    : WEBP_YUV420;
+    ok = WebPPictureAlloc(pic);
+    if (!ok) {
+      status = VP8_STATUS_OUT_OF_MEMORY;
+      break;
+    }
+    if (pic->use_argb) {
+      output_buffer->colorspace = MODE_BGRA;
+      output_buffer->u.RGBA.rgba = (uint8_t*)pic->argb;
+      output_buffer->u.RGBA.stride = pic->argb_stride * sizeof(uint32_t);
+      output_buffer->u.RGBA.size = output_buffer->u.RGBA.stride * pic->height;
+    } else {
+      output_buffer->colorspace = has_alpha ? MODE_YUVA : MODE_YUV;
+      output_buffer->u.YUVA.y = pic->y;
+      output_buffer->u.YUVA.u = pic->u;
+      output_buffer->u.YUVA.v = pic->v;
+      output_buffer->u.YUVA.a = has_alpha ? pic->a : NULL;
+      output_buffer->u.YUVA.y_stride = pic->y_stride;
+      output_buffer->u.YUVA.u_stride = pic->uv_stride;
+      output_buffer->u.YUVA.v_stride = pic->uv_stride;
+      output_buffer->u.YUVA.a_stride = has_alpha ? pic->a_stride : 0;
+      output_buffer->u.YUVA.y_size = pic->height * pic->y_stride;
+      output_buffer->u.YUVA.u_size = (pic->height + 1) / 2 * pic->uv_stride;
+      output_buffer->u.YUVA.v_size = (pic->height + 1) / 2 * pic->uv_stride;
+      output_buffer->u.YUVA.a_size = pic->height * pic->a_stride;
+    }
+    output_buffer->is_external_memory = 1;
+
+    status = DecodeWebP(data, data_size, &config);
+    ok = (status == VP8_STATUS_OK);
+    if (!ok) WebPPictureFree(pic);
+    if (ok && !keep_alpha && pic->use_argb) {
+      // Need to wipe out the alpha value, as requested.
+      int x, y;
+      uint32_t* argb = pic->argb;
+      for (y = 0; y < pic->height; ++y) {
+        for (x = 0; x < pic->width; ++x) argb[x] |= 0xff000000u;
+        argb += pic->argb_stride;
+      }
+    }
+  } while (0);   // <- so we can 'break' out of the loop
+
+  if (status != VP8_STATUS_OK) {
+    PrintWebPError("input data", status);
+  }
+
+  WebPFreeDecBuffer(output_buffer);
+  return ok;
+}
+
+// -----------------------------------------------------------------------------

imageio/webpdec.h

@@ -0,0 +1,67 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// WebP decode.
+
+#ifndef WEBP_IMAGEIO_WEBPDEC_H_
+#define WEBP_IMAGEIO_WEBPDEC_H_
+
+#include "webp/decode.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct Metadata;
+struct WebPPicture;
+
+//------------------------------------------------------------------------------
+// WebP decoding
+
+// Prints an informative error message regarding decode failure of 'in_file'.
+// 'status' is treated as a VP8StatusCode and if valid will be printed as a
+// text string.
+void PrintWebPError(const char* const in_file, int status);
+
+// Reads a WebP from 'in_file', returning the contents and size in 'data' and
+// 'data_size'. If not NULL, 'bitstream' is populated using WebPGetFeatures().
+// Returns true on success.
+int LoadWebP(const char* const in_file,
+             const uint8_t** data, size_t* data_size,
+             WebPBitstreamFeatures* bitstream);
+
+// Decodes the WebP contained in 'data'.
+// 'config' is a structure previously initialized by WebPInitDecoderConfig().
+// 'config->output' should have the desired colorspace selected.
+// Returns the decoder status. On success 'config->output' will contain the
+// decoded picture.
+VP8StatusCode DecodeWebP(const uint8_t* const data, size_t data_size,
+                         WebPDecoderConfig* const config);
+
+// Same as DecodeWebP(), but using the incremental decoder.
+VP8StatusCode DecodeWebPIncremental(
+    const uint8_t* const data, size_t data_size,
+    WebPDecoderConfig* const config);
+
+//------------------------------------------------------------------------------
+
+// Decodes a WebP contained in 'data', returning the decoded output in 'pic'.
+// Output is RGBA or YUVA, depending on pic->use_argb value.
+// If 'keep_alpha' is true and the WebP has an alpha channel, the output is RGBA
+// or YUVA. Otherwise, alpha channel is dropped and output is RGB or YUV.
+// Returns true on success.
+int ReadWebP(const uint8_t* const data, size_t data_size,
+             struct WebPPicture* const pic,
+             int keep_alpha, struct Metadata* const metadata);
+
+#ifdef __cplusplus
+}    // extern "C"
+#endif
+
+#endif  // WEBP_IMAGEIO_WEBPDEC_H_

imageio/wicdec.c

@@ -33,7 +33,7 @@
 #include <wincodec.h>
 
 #include "webp/encode.h"
-#include "./example_util.h"
+#include "./imageio_util.h"
 #include "./metadata.h"
 
 #define IFS(fn)                                                     \
@@ -88,7 +88,7 @@ static HRESULT OpenInputStream(const char* filename, IStream** stream) {
   if (!strcmp(filename, "-")) {
     const uint8_t* data = NULL;
     size_t data_size = 0;
-    const int ok = ExUtilReadFile(filename, &data, &data_size);
+    const int ok = ImgIoUtilReadFile(filename, &data, &data_size);
     if (ok) {
       HGLOBAL image = GlobalAlloc(GMEM_MOVEABLE, data_size);
       if (image != NULL) {
@@ -276,6 +276,8 @@ int ReadPictureWithWIC(const char* const filename,
   int has_alpha = 0;
   int64_t stride;
 
+  if (filename == NULL || pic == NULL) return 0;
+
   IFS(CoInitialize(NULL));
   IFS(CoCreateInstance(MAKE_REFGUID(CLSID_WICImagingFactory), NULL,
                        CLSCTX_INPROC_SERVER,

imageio/wicdec.h

@@ -9,8 +9,8 @@
 //
 // Windows Imaging Component (WIC) decode.
 
-#ifndef WEBP_EXAMPLES_WICDEC_H_
-#define WEBP_EXAMPLES_WICDEC_H_
+#ifndef WEBP_IMAGEIO_WICDEC_H_
+#define WEBP_IMAGEIO_WICDEC_H_
 
 #ifdef __cplusplus
 extern "C" {
@@ -31,4 +31,4 @@ int ReadPictureWithWIC(const char* const filename,
 }    // extern "C"
 #endif
 
-#endif  // WEBP_EXAMPLES_WICDEC_H_
+#endif  // WEBP_IMAGEIO_WICDEC_H_

iosbuild.sh

@@ -122,8 +122,8 @@ for PLATFORM in ${PLATFORMS}; do
   export PATH=${OLDPATH}
 done
 
-cp -a ${SRCDIR}/src/webp/*.h ${TARGETDIR}/Headers/
+cp -a ${SRCDIR}/src/webp/{decode,encode,types}.h ${TARGETDIR}/Headers/
 ${LIPO} -create ${LIBLIST} -output ${TARGETDIR}/WebP
 
-cp -a ${SRCDIR}/src/webp/*.h ${DECTARGETDIR}/Headers/
+cp -a ${SRCDIR}/src/webp/{decode,types}.h ${DECTARGETDIR}/Headers/
 ${LIPO} -create ${DECLIBLIST} -output ${DECTARGETDIR}/WebPDecoder

makefile.unix

@@ -3,7 +3,7 @@
 # It will not install the libraries system-wide, but just create the 'cwebp'
 # and 'dwebp' tools in the examples/ directory, along with the static
 # libraries 'src/libwebp.a', 'src/libwebpdecoder.a', 'src/mux/libwebpmux.a',
-# 'src/demux/libwebpdemux.a' and 'src/libwebpextras.a'.
+# 'src/demux/libwebpdemux.a' and 'extras/libwebpextras.a'.
 #
 # To build the library and examples, use:
 #    make -f makefile.unix
@@ -29,6 +29,8 @@ ifeq ($(strip $(shell uname)), Darwin)
   EXTRA_LIBS  += -L/opt/local/lib
   GL_LIBS = -framework GLUT -framework OpenGL
 else
+  EXTRA_FLAGS += -I/usr/local/include
+  EXTRA_LIBS  += -L/usr/local/lib
   GL_LIBS = -lglut -lGL
 endif
 
@@ -113,16 +115,16 @@ ANIM_UTIL_OBJS = \
     examples/anim_util.o \
 
 DEC_OBJS = \
-    src/dec/alpha.o \
-    src/dec/buffer.o \
-    src/dec/frame.o \
-    src/dec/idec.o \
-    src/dec/io.o \
-    src/dec/quant.o \
-    src/dec/tree.o \
-    src/dec/vp8.o \
-    src/dec/vp8l.o \
-    src/dec/webp.o \
+    src/dec/alpha_dec.o \
+    src/dec/buffer_dec.o \
+    src/dec/frame_dec.o \
+    src/dec/idec_dec.o \
+    src/dec/io_dec.o \
+    src/dec/quant_dec.o \
+    src/dec/tree_dec.o \
+    src/dec/vp8_dec.o \
+    src/dec/vp8l_dec.o \
+    src/dec/webp_dec.o \
 
 DEMUX_OBJS = \
     src/demux/anim_decode.o \
@@ -131,6 +133,7 @@ DEMUX_OBJS = \
 DSP_DEC_OBJS = \
     src/dsp/alpha_processing.o \
     src/dsp/alpha_processing_mips_dsp_r2.o \
+    src/dsp/alpha_processing_neon.o \
     src/dsp/alpha_processing_sse2.o \
     src/dsp/alpha_processing_sse41.o \
     src/dsp/cpu.o \
@@ -144,23 +147,29 @@ DSP_DEC_OBJS = \
     src/dsp/dec_sse41.o \
     src/dsp/filters.o \
     src/dsp/filters_mips_dsp_r2.o \
+    src/dsp/filters_msa.o \
+    src/dsp/filters_neon.o \
     src/dsp/filters_sse2.o \
     src/dsp/lossless.o \
     src/dsp/lossless_mips_dsp_r2.o \
+    src/dsp/lossless_msa.o \
     src/dsp/lossless_neon.o \
     src/dsp/lossless_sse2.o \
     src/dsp/rescaler.o \
     src/dsp/rescaler_mips32.o \
     src/dsp/rescaler_mips_dsp_r2.o \
+    src/dsp/rescaler_msa.o \
     src/dsp/rescaler_neon.o \
     src/dsp/rescaler_sse2.o \
     src/dsp/upsampling.o \
     src/dsp/upsampling_mips_dsp_r2.o \
+    src/dsp/upsampling_msa.o \
     src/dsp/upsampling_neon.o \
     src/dsp/upsampling_sse2.o \
     src/dsp/yuv.o \
     src/dsp/yuv_mips32.o \
     src/dsp/yuv_mips_dsp_r2.o \
+    src/dsp/yuv_neon.o \
     src/dsp/yuv_sse2.o \
 
 DSP_ENC_OBJS = \
@@ -175,47 +184,57 @@ DSP_ENC_OBJS = \
     src/dsp/enc_avx2.o \
     src/dsp/enc_mips32.o \
     src/dsp/enc_mips_dsp_r2.o \
+    src/dsp/enc_msa.o \
     src/dsp/enc_neon.o \
     src/dsp/enc_sse2.o \
     src/dsp/enc_sse41.o \
     src/dsp/lossless_enc.o \
     src/dsp/lossless_enc_mips32.o \
     src/dsp/lossless_enc_mips_dsp_r2.o \
+    src/dsp/lossless_enc_msa.o \
     src/dsp/lossless_enc_neon.o \
     src/dsp/lossless_enc_sse2.o \
     src/dsp/lossless_enc_sse41.o \
+    src/dsp/ssim.o \
+    src/dsp/ssim_sse2.o \
 
 ENC_OBJS = \
-    src/enc/alpha.o \
-    src/enc/analysis.o \
-    src/enc/backward_references.o \
-    src/enc/config.o \
-    src/enc/cost.o \
-    src/enc/delta_palettization.o \
-    src/enc/filter.o \
-    src/enc/frame.o \
-    src/enc/histogram.o \
-    src/enc/iterator.o \
-    src/enc/near_lossless.o \
-    src/enc/picture.o \
-    src/enc/picture_csp.o \
-    src/enc/picture_psnr.o \
-    src/enc/picture_rescale.o \
-    src/enc/picture_tools.o \
-    src/enc/quant.o \
-    src/enc/syntax.o \
-    src/enc/token.o \
-    src/enc/tree.o \
-    src/enc/vp8l.o \
-    src/enc/webpenc.o \
+    src/enc/alpha_enc.o \
+    src/enc/analysis_enc.o \
+    src/enc/backward_references_cost_enc.o \
+    src/enc/backward_references_enc.o \
+    src/enc/config_enc.o \
+    src/enc/cost_enc.o \
+    src/enc/delta_palettization_enc.o \
+    src/enc/filter_enc.o \
+    src/enc/frame_enc.o \
+    src/enc/histogram_enc.o \
+    src/enc/iterator_enc.o \
+    src/enc/near_lossless_enc.o \
+    src/enc/picture_enc.o \
+    src/enc/picture_csp_enc.o \
+    src/enc/picture_psnr_enc.o \
+    src/enc/picture_rescale_enc.o \
+    src/enc/picture_tools_enc.o \
+    src/enc/predictor_enc.o \
+    src/enc/quant_enc.o \
+    src/enc/syntax_enc.o \
+    src/enc/token_enc.o \
+    src/enc/tree_enc.o \
+    src/enc/vp8l_enc.o \
+    src/enc/webp_enc.o \
 
 EX_FORMAT_DEC_OBJS = \
-    examples/image_dec.o \
-    examples/jpegdec.o \
-    examples/metadata.o \
-    examples/pngdec.o \
-    examples/tiffdec.o \
-    examples/webpdec.o \
+    imageio/image_dec.o \
+    imageio/jpegdec.o \
+    imageio/metadata.o \
+    imageio/pngdec.o \
+    imageio/pnmdec.o \
+    imageio/tiffdec.o \
+    imageio/webpdec.o \
+
+EX_FORMAT_ENC_OBJS = \
+    imageio/image_enc.o \
 
 EX_UTIL_OBJS = \
     examples/example_util.o \
@@ -223,6 +242,9 @@ EX_UTIL_OBJS = \
 GIFDEC_OBJS = \
     examples/gifdec.o \
 
+IMAGE_UTIL_OBJS = \
+    imageio/imageio_util.o \
+
 MUX_OBJS = \
     src/mux/anim_encode.o \
     src/mux/muxedit.o \
@@ -230,23 +252,24 @@ MUX_OBJS = \
     src/mux/muxread.o \
 
 UTILS_DEC_OBJS = \
-    src/utils/bit_reader.o \
-    src/utils/color_cache.o \
-    src/utils/filters.o \
-    src/utils/huffman.o \
-    src/utils/quant_levels_dec.o \
-    src/utils/random.o \
-    src/utils/rescaler.o \
-    src/utils/thread.o \
+    src/utils/bit_reader_utils.o \
+    src/utils/color_cache_utils.o \
+    src/utils/filters_utils.o \
+    src/utils/huffman_utils.o \
+    src/utils/quant_levels_dec_utils.o \
+    src/utils/random_utils.o \
+    src/utils/rescaler_utils.o \
+    src/utils/thread_utils.o \
     src/utils/utils.o \
 
 UTILS_ENC_OBJS = \
-    src/utils/bit_writer.o \
-    src/utils/huffman_encode.o \
-    src/utils/quant_levels.o \
+    src/utils/bit_writer_utils.o \
+    src/utils/huffman_encode_utils.o \
+    src/utils/quant_levels_utils.o \
 
 EXTRA_OBJS = \
-    src/extras/extras.o \
+    extras/extras.o \
+    extras/quality_estimate.o \
 
 LIBWEBPDECODER_OBJS = $(DEC_OBJS) $(DSP_DEC_OBJS) $(UTILS_DEC_OBJS)
 LIBWEBP_OBJS = $(LIBWEBPDECODER_OBJS) $(ENC_OBJS) $(DSP_ENC_OBJS) \
@@ -264,82 +287,95 @@ HDRS_INSTALLED = \
     src/webp/types.h \
 
 HDRS = \
-    src/dec/alphai.h \
-    src/dec/common.h \
-    src/dec/decode_vp8.h \
-    src/dec/vp8i.h \
-    src/dec/vp8li.h \
-    src/dec/webpi.h \
+    src/dec/alphai_dec.h \
+    src/dec/common_dec.h \
+    src/dec/vp8_dec.h \
+    src/dec/vp8i_dec.h \
+    src/dec/vp8li_dec.h \
+    src/dec/webpi_dec.h \
     src/dsp/common_sse2.h \
     src/dsp/dsp.h \
     src/dsp/lossless.h \
+    src/dsp/lossless_common.h \
     src/dsp/mips_macro.h \
     src/dsp/msa_macro.h \
     src/dsp/neon.h \
     src/dsp/yuv.h \
-    src/enc/backward_references.h \
-    src/enc/cost.h \
-    src/enc/delta_palettization.h \
-    src/enc/histogram.h \
-    src/enc/vp8enci.h \
-    src/enc/vp8li.h \
+    src/enc/backward_references_enc.h \
+    src/enc/cost_enc.h \
+    src/enc/delta_palettization_enc.h \
+    src/enc/histogram_enc.h \
+    src/enc/vp8i_enc.h \
+    src/enc/vp8li_enc.h \
+    src/mux/animi.h \
     src/mux/muxi.h \
-    src/utils/bit_reader.h \
-    src/utils/bit_reader_inl.h \
-    src/utils/bit_writer.h \
-    src/utils/color_cache.h \
-    src/utils/endian_inl.h \
-    src/utils/filters.h \
-    src/utils/huffman.h \
-    src/utils/huffman_encode.h \
-    src/utils/quant_levels.h \
-    src/utils/quant_levels_dec.h \
-    src/utils/random.h \
-    src/utils/rescaler.h \
-    src/utils/thread.h \
+    src/utils/bit_reader_utils.h \
+    src/utils/bit_reader_inl_utils.h \
+    src/utils/bit_writer_utils.h \
+    src/utils/color_cache_utils.h \
+    src/utils/endian_inl_utils.h \
+    src/utils/filters_utils.h \
+    src/utils/huffman_utils.h \
+    src/utils/huffman_encode_utils.h \
+    src/utils/quant_levels_utils.h \
+    src/utils/quant_levels_dec_utils.h \
+    src/utils/random_utils.h \
+    src/utils/rescaler_utils.h \
+    src/utils/thread_utils.h \
     src/utils/utils.h \
     src/webp/format_constants.h \
     $(HDRS_INSTALLED) \
 
-OUT_LIBS = examples/libexample_util.a src/libwebpdecoder.a src/libwebp.a
-EXTRA_LIB = src/libwebpextras.a
+OUT_LIBS = examples/libexample_util.a
+OUT_LIBS += imageio/libimageio_util.a
+OUT_LIBS += imageio/libimagedec.a
+OUT_LIBS += imageio/libimageenc.a
+OUT_LIBS += src/libwebpdecoder.a
+OUT_LIBS += src/libwebp.a
+EXTRA_LIB = extras/libwebpextras.a
 OUT_EXAMPLES = examples/cwebp examples/dwebp
 EXTRA_EXAMPLES = examples/gif2webp examples/vwebp examples/webpmux \
-                 examples/anim_diff
+                 examples/anim_diff examples/img2webp examples/webpinfo
+OTHER_EXAMPLES = extras/get_disto extras/webp_quality extras/vwebp_sdl
 
 OUTPUT = $(OUT_LIBS) $(OUT_EXAMPLES)
 ifeq ($(MAKECMDGOALS),clean)
-  OUTPUT += $(EXTRA_EXAMPLES)
+  OUTPUT += $(EXTRA_EXAMPLES) $(OTHER_EXAMPLES)
   OUTPUT += src/demux/libwebpdemux.a src/mux/libwebpmux.a $(EXTRA_LIB)
   OUTPUT += examples/libgifdec.a examples/libanim_util.a
 endif
 
 ex: $(OUT_EXAMPLES)
-all: ex $(EXTRA_EXAMPLES)
+all: ex $(EXTRA_EXAMPLES) $(OTHER_EXAMPLES)
 extras: $(EXTRA_LIB)
 
 $(EX_FORMAT_DEC_OBJS): %.o: %.h
 
 # special dependencies:
-#   tree.c/vp8.c/bit_reader.c <-> bit_reader_inl.h, endian_inl.h
-#   bit_writer.c <-> endian_inl.h
-src/dec/tree.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
-src/dec/vp8.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
-src/utils/bit_reader.o: src/utils/bit_reader_inl.h src/utils/endian_inl.h
-src/utils/bit_writer.o: src/utils/endian_inl.h
+#   tree_dec.c/vp8_dec.c/bit_reader_utils.c <->
+#     bit_reader_inl_utils.h, endian_inl_utils.h
+#   bit_writer_utils.c <-> endian_inl_utils.h
+src/dec/tree_dec.o: src/utils/bit_reader_inl_utils.h
+src/dec/tree_dec.o: src/utils/endian_inl_utils.h
+src/dec/vp8_dec.o: src/utils/bit_reader_inl_utils.h src/utils/endian_inl_utils.h
+src/utils/bit_reader_utils.o: src/utils/bit_reader_inl_utils.h
+src/utils/bit_reader_utils.o: src/utils/endian_inl_utils.h
+src/utils/bit_writer_utils.o: src/utils/endian_inl_utils.h
 
 %.o: %.c $(HDRS)
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@
 
 examples/libanim_util.a: $(ANIM_UTIL_OBJS)
-examples/libexample_dec.a: $(EX_FORMAT_DEC_OBJS)
 examples/libexample_util.a: $(EX_UTIL_OBJS)
 examples/libgifdec.a: $(GIFDEC_OBJS)
+extras/libwebpextras.a: $(LIBWEBPEXTRA_OBJS)
+imageio/libimagedec.a: $(EX_FORMAT_DEC_OBJS)
+imageio/libimageenc.a: $(EX_FORMAT_ENC_OBJS)
+imageio/libimageio_util.a: $(IMAGE_UTIL_OBJS)
 src/libwebpdecoder.a: $(LIBWEBPDECODER_OBJS)
 src/libwebp.a: $(LIBWEBP_OBJS)
 src/mux/libwebpmux.a: $(LIBWEBPMUX_OBJS)
 src/demux/libwebpdemux.a: $(LIBWEBPDEMUX_OBJS)
-src/libwebpextras.a: $(LIBWEBPEXTRA_OBJS)
 
 %.a:
 	$(AR) $(ARFLAGS) $@ $^
@@ -350,29 +386,58 @@ examples/dwebp: examples/dwebp.o
 examples/gif2webp: examples/gif2webp.o $(GIFDEC_OBJS)
 examples/vwebp: examples/vwebp.o
 examples/webpmux: examples/webpmux.o
+examples/img2webp: examples/img2webp.o
+examples/webpinfo: examples/webpinfo.o
 
 examples/anim_diff: examples/libanim_util.a examples/libgifdec.a
 examples/anim_diff: src/demux/libwebpdemux.a examples/libexample_util.a
-examples/anim_diff: src/libwebp.a
+examples/anim_diff: imageio/libimageio_util.a src/libwebp.a
 examples/anim_diff: EXTRA_LIBS += $(GIF_LIBS)
 examples/anim_diff: EXTRA_FLAGS += -DWEBP_HAVE_GIF
-examples/cwebp: examples/libexample_util.a examples/libexample_dec.a
+examples/cwebp: examples/libexample_util.a
+examples/cwebp: imageio/libimagedec.a
+examples/cwebp: imageio/libimageio_util.a
 examples/cwebp: src/libwebp.a
 examples/cwebp: EXTRA_LIBS += $(CWEBP_LIBS)
-examples/dwebp: examples/libexample_util.a src/libwebpdecoder.a
+examples/dwebp: examples/libexample_util.a
+examples/dwebp: imageio/libimagedec.a
+examples/dwebp: imageio/libimageenc.a
+examples/dwebp: imageio/libimageio_util.a
+examples/dwebp: src/libwebp.a
 examples/dwebp: EXTRA_LIBS += $(DWEBP_LIBS)
-examples/gif2webp: examples/libexample_util.a examples/libgifdec.a
-examples/gif2webp: src/mux/libwebpmux.a src/libwebp.a
+examples/gif2webp: examples/libexample_util.a imageio/libimageio_util.a
+examples/gif2webp: examples/libgifdec.a src/mux/libwebpmux.a src/libwebp.a
 examples/gif2webp: EXTRA_LIBS += $(GIF_LIBS)
 examples/gif2webp: EXTRA_FLAGS += -DWEBP_HAVE_GIF
 examples/vwebp: examples/libexample_util.a src/demux/libwebpdemux.a
-examples/vwebp: src/libwebp.a
+examples/vwebp: imageio/libimageio_util.a src/libwebp.a
 examples/vwebp: EXTRA_LIBS += $(GL_LIBS)
 examples/vwebp: EXTRA_FLAGS += -DWEBP_HAVE_GL
-examples/webpmux: examples/libexample_util.a src/mux/libwebpmux.a
-examples/webpmux: src/libwebpdecoder.a
+examples/webpmux: examples/libexample_util.a imageio/libimageio_util.a
+examples/webpmux: src/mux/libwebpmux.a src/libwebpdecoder.a
+examples/img2webp: examples/libexample_util.a imageio/libimageio_util.a
+examples/img2webp: imageio/libimagedec.a
+examples/img2webp: src/mux/libwebpmux.a src/libwebp.a
+examples/img2webp: EXTRA_LIBS += $(CWEBP_LIBS)
+examples/webpinfo: examples/libexample_util.a imageio/libimageio_util.a
+examples/webpinfo: src/libwebpdecoder.a
 
-$(OUT_EXAMPLES) $(EXTRA_EXAMPLES):
+extras/get_disto: extras/get_disto.o
+extras/get_disto: imageio/libimagedec.a imageio/libimageio_util.a src/libwebp.a
+extras/get_disto: EXTRA_LIBS += $(CWEBP_LIBS)
+
+extras/webp_quality: extras/webp_quality.o
+extras/webp_quality: imageio/libimageio_util.a
+extras/webp_quality: $(EXTRA_LIB) src/libwebp.a
+
+extras/vwebp_sdl: extras/vwebp_sdl.o
+extras/vwebp_sdl: extras/webp_to_sdl.o
+extras/vwebp_sdl: imageio/libimageio_util.a
+extras/vwebp_sdl: src/libwebp.a
+extras/vwebp_sdl: EXTRA_FLAGS += -DWEBP_HAVE_SDL
+extras/vwebp_sdl: EXTRA_LIBS += -lSDL
+
+$(OUT_EXAMPLES) $(EXTRA_EXAMPLES) $(OTHER_EXAMPLES):
 	$(CC) -o $@ $^ $(LDFLAGS)
 
 dist: DESTDIR := dist
@@ -386,7 +451,8 @@ dist: all
 	$(INSTALL) -m644 src/demux/libwebpdemux.a $(DESTDIR)/lib
 	$(INSTALL) -m644 src/mux/libwebpmux.a $(DESTDIR)/lib
 	umask 022; \
-	for m in man/[cdv]webp.1 man/gif2webp.1 man/webpmux.1; do \
+	for m in man/[cdv]webp.1 man/gif2webp.1 man/webpmux.1 \
+                 man/img2webp.1 man/webpinfo.1; do \
 	  basenam=$$(basename $$m .1); \
 	  $(GROFF) -t -e -man -T utf8 $$m \
 	    | $(COL) -bx >$(DESTDIR)/doc/$${basenam}.txt; \
@@ -397,11 +463,12 @@ dist: all
 clean:
 	$(RM) $(OUTPUT) *~ \
               examples/*.o examples/*~ \
+              extras/*.o extras/*~ \
+              imageio/*.o imageio/*~ \
               src/dec/*.o src/dec/*~ \
               src/demux/*.o src/demux/*~ \
               src/dsp/*.o src/dsp/*~ \
               src/enc/*.o src/enc/*~ \
-              src/extras/*.o src/extras/*~ \
               src/mux/*.o src/mux/*~ \
               src/utils/*.o src/utils/*~ \
               src/webp/*~ man/*~ doc/*~ swig/*~ \

man/Makefile.am

@@ -8,4 +8,7 @@ endif
 if BUILD_VWEBP
   man_MANS += vwebp.1
 endif
+if BUILD_WEBPINFO
+  man_MANS += webpinfo.1
+endif
 EXTRA_DIST = $(man_MANS)

man/cwebp.1

@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH CWEBP 1 "September 02, 2016"
+.TH CWEBP 1 "January 20, 2017"
 .SH NAME
 cwebp \- compress an image file to a WebP file
 .SH SYNOPSIS
@@ -98,8 +98,7 @@ Crop the source to a rectangle with top\-left corner at coordinates
 This cropping area must be fully contained within the source rectangle.
 .TP
 .B \-mt
-Use multi\-threading for encoding, if possible. This option is only effective
-when using lossy compression on a source with a transparency channel.
+Use multi\-threading for encoding, if possible.
 .TP
 .B \-low_memory
 Reduce memory usage of lossy encoding by saving four times the compressed
@@ -166,6 +165,10 @@ Use strong filtering (if filtering is being used thanks to the
 Disable strong filtering (if filtering is being used thanks to the
 \fB\-f\fP option) and use simple filtering instead.
 .TP
+.B \-sharp_yuv
+Use more accurate and sharper RGB->YUV conversion if needed. Note that this
+process is slower than the default 'fast' RGB->YUV conversion.
+.TP
 .BI \-sns " int
 Specify the amplitude of the spatial noise shaping. Spatial noise shaping
 (or \fBsns\fP for short) refers to a general collection of built\-in algorithms

man/gif2webp.1

@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH GIF2WEBP 1 "June 23, 2016"
+.TH GIF2WEBP 1 "January 25, 2017"
 .SH NAME
 gif2webp \- Convert a GIF image to WebP
 .SH SYNOPSIS
@@ -68,8 +68,9 @@ Specify the minimum and maximum distance between consecutive key frames
 some key frames into the output animation as needed so that this criteria is
 satisfied.
 .br
-A 'kmin' value of 0 will turn off insertion of key frames. A 'kmax' value of 0
-will result in all frames being key frames.
+A 'kmax' value of 0 will turn off insertion of key frames. A 'kmax' value of 1
+will result in all frames being key frames. 'kmin' value is not taken into
+account in both these special cases.
 Typical values are in the range 3 to 30. Default values are kmin = 9,
 kmax = 17 for lossless compression and kmin = 3, kmax = 5 for lossy compression.
 .br
@@ -107,8 +108,7 @@ the value the smoother the picture will appear. Typical values are usually in
 the range of 20 to 50.
 .TP
 .B \-mt
-Use multi-threading for encoding, if possible. This option is only effective
-when using lossy compression.
+Use multi-threading for encoding, if possible.
 .TP
 .B \-v
 Print extra information.

man/img2webp.1

@@ -0,0 +1,97 @@
+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH IMG2WEBP 1 "January 23, 2017"
+.SH NAME
+img2webp \- create animated WebP file from a sequence of input images.
+.SH SYNOPSIS
+.B img2webp
+[file_level_options] [files] [per_frame_options...]
+.br
+.SH DESCRIPTION
+This manual page documents the
+.B img2webp
+command.
+.PP
+\fBimg2webp\fP compresses a sequence of images using the animated WebP format.
+Input images can either be PNG, JPEG, TIFF or WebP.
+.SH FILE-LEVEL OPTIONS
+The file-level options are applied at the beginning of the compression process,
+before the input frames are read.
+.TP
+.BI \-o " string
+Specify the name of the output WebP file.
+.TP
+.BI \-min_size
+Encode images to achieve smallest size. This disables key frame insertion and
+picks the parameters resulting in smallest output for each frame. It uses
+lossless compression by default, but can be combined with \-q, \-m, \-lossy or
+\-mixed options.
+.TP
+.BI \-kmin " int
+.TP
+.BI \-kmax " int
+Specify the minimum and maximum distance between consecutive key frames
+(independently decodable frames) in the output animation. The tool will insert
+some key frames into the output animation as needed so that this criteria is
+satisfied.
+.br
+.B \-mixed
+Mixed compression mode: optimize compression of the image by picking either
+lossy or lossless compression for each frame heuristically. This global
+option disables the local option \fB-lossy\fP and \fB-lossless\fP .
+.TP
+.BI \-loop " int
+Specifies the number of times the animation should loop. Using '0' means
+'loop indefinitely'.
+.TP
+.BI \-v
+Be more verbose.
+.TP
+.B \-h, \-help
+A short usage summary.
+
+.SH PER-FRAME OPTIONS
+The per-frame options are applied for the images following as arguments in the
+command line. They can be modified any number of times preceding each particular
+input image.
+.TP
+.BI \-d " int
+Specify the image duration in milliseconds.
+.TP
+.B \-lossless, \-lossy
+Compress the next image(s) using lossless or lossy compression mode. The
+default mode is lossless.
+.TP
+.BI \-q " float
+Specify the compression factor between 0 and 100. The default is 75.
+.TP
+.BI \-m " int
+Specify the compression method to use. This parameter controls the
+trade off between encoding speed and the compressed file size and quality.
+Possible values range from 0 to 6. Default value is 4.
+
+.SH EXAMPLE
+img2webp -loop 2 in0.png -lossy in1.jpg -d 80 in2.tiff -o out.webp
+.br
+
+.SH BUGS
+Please report all bugs to the issue tracker:
+https://bugs.chromium.org/p/webp
+.br
+Patches welcome! See this page to get started:
+http://www.webmproject.org/code/contribute/submitting\-patches/
+
+.SH AUTHORS
+\fBimg2webp\fP is a part of libwebp and was written by the WebP team.
+.br
+The latest source tree is available at
+https://chromium.googlesource.com/webm/libwebp
+.PP
+This manual page was written by Pascal Massimino <pascal.massimino@gmail.com>,
+for the Debian project (and may be used by others).
+
+.SH SEE ALSO
+.BR webpmux (1),
+.BR gif2webp (1)
+.br
+Please refer to http://developers.google.com/speed/webp/ for additional
+information.

man/vwebp.1

@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH VWEBP 1 "June 23, 2016"
+.TH VWEBP 1 "November 25, 2016"
 .SH NAME
 vwebp \- decompress a WebP file and display it in a window
 .SH SYNOPSIS
@@ -59,6 +59,9 @@ Toggle use of color profile.
 .B 'i'
 Overlay file information.
 .TP
+.B 'd'
+Disable blending and disposal process, for debugging purposes.
+.TP
 .B 'q' / 'Q' / ESC
 Quit.
 

man/webpinfo.1

@@ -0,0 +1,77 @@
+.\"                                      Hey, EMACS: -*- nroff -*-
+.TH WEBPINFO 1 "May 08, 2017"
+.SH NAME
+webpinfo \- print out the chunk level structure of WebP files
+along with basic integrity checks.
+.SH SYNOPSIS
+.B webpinfo
+.I OPTIONS
+.I INPUT
+.br
+.B webpinfo [\-h|\-help|\-H|\-longhelp]
+.br
+
+.SH DESCRIPTION
+This manual page documents the
+.B webpinfo
+command.
+.PP
+\fBwebpinfo\fP can be used to print out the chunk level structure and bitstream
+header information of WebP files. It can also check if the files are of valid
+WebP format.
+
+.SH OPTIONS
+.TP
+.B -quiet
+Do not show chunk parsing information.
+.TP
+.B -diag
+Show parsing error diagnosis.
+.TP
+.B -summary
+Show chunk stats summary.
+.TP
+.BI -bitstream_info
+Parse bitstream header.
+.TP
+.B \-h, \-help
+A short usage summary.
+.TP
+.B \-H, \-longhelp
+Detailed usage instructions.
+
+.SH INPUT
+Input files in WebP format. Input files must come last, following
+options (if any). There can be multiple input files.
+
+.SH BUGS
+Please report all bugs to the issue tracker:
+https://bugs.chromium.org/p/webp
+.br
+Patches welcome! See this page to get started:
+http://www.webmproject.org/code/contribute/submitting\-patches/
+
+.SH EXAMPLES
+.br
+webpinfo \-h
+.br
+webpinfo \-diag \-summary input_file.webp
+.br
+webpinfo \-bitstream_info input_file_1.webp input_file_2.webp
+.br
+webpinfo *.webp
+
+.SH AUTHORS
+\fBwebpinfo\fP is a part of libwebp and was written by the WebP team.
+.br
+The latest source tree is available at
+https://chromium.googlesource.com/webm/libwebp
+.PP
+This manual page was written by Hui Su <huisu@google.com>,
+for the Debian project (and may be used by others).
+
+.SH SEE ALSO
+.BR webpmux (1)
+.br
+Please refer to http://developers.google.com/speed/webp/ for additional
+information.

man/webpmux.1

@@ -1,5 +1,5 @@
 .\"                                      Hey, EMACS: -*- nroff -*-
-.TH WEBPMUX 1 "June 23, 2016"
+.TH WEBPMUX 1 "November 10, 2016"
 .SH NAME
 webpmux \- create animated WebP files from non\-animated WebP images, extract
 frames from animated WebP images, and manage XMP/EXIF metadata and ICC profile.
@@ -35,6 +35,13 @@ frames from animated WebP images, and manage XMP/EXIF metadata and ICC profile.
 .I OUTPUT
 .RE
 .br
+.B webpmux \-duration
+.I DURATION OPTIONS
+.B [ \-duration ... ]
+.I INPUT
+.B \-o
+.I OUTPUT
+.br
 .B webpmux \-info
 .I INPUT
 .br
@@ -91,6 +98,42 @@ Strip EXIF metadata.
 .B xmp
 Strip XMP metadata.
 
+.SS DURATION_OPTIONS (\-duration)
+Amend the duration of a specific interval of frames. This option is only
+effective on animated WebP and has no effect on a single-frame file.
+.TP
+.I duration[,start[,end]]
+Where:
+.br
+.B duration
+is the duration for the interval in milliseconds (mandatory).
+Must be non-negative.
+.br
+.B start
+is the starting frame index of the interval (optional).
+.br
+.B end
+is the ending frame index (inclusive) of the interval (optional).
+.TP
+The three typical usages of this option are:
+.br
+.B -duration d
+     set the duration to 'd' for the whole animation.
+.br
+.B -duration d,f
+     set the duration of frame 'f' to 'd'.
+.br
+.B -duration d,start,end
+     set the duration to 'd' for the whole [start,end] interval.
+.TP
+.P
+Note that the frames outside of the [start, end] interval will remain untouched.
+The 'end' value '0' has the special meaning 'last frame of the animation'.
+.TP
+.I Reminder:
+frame indexing starts at '1'.
+.br
+
 .SS FRAME_OPTIONS (\-frame)
 Create an animated WebP file from multiple (non\-animated) WebP images.
 .TP

src/Makefile.am

@@ -1,4 +1,4 @@
-# The mux, demux and extras libraries depend on libwebp, thus the '.' to force
+# The mux and demux libraries depend on libwebp, thus the '.' to force
 # the build order so it's available to them.
 SUBDIRS = dec enc dsp utils .
 if WANT_MUX
@@ -7,9 +7,6 @@ endif
 if WANT_DEMUX
   SUBDIRS += demux
 endif
-if WANT_EXTRAS
-  SUBDIRS += extras
-endif
 
 lib_LTLIBRARIES = libwebp.la
 
@@ -38,7 +35,7 @@ libwebp_la_LIBADD += utils/libwebputils.la
 # other than the ones listed on the command line, i.e., after linking, it will
 # not have unresolved symbols. Some platforms (Windows among them) require all
 # symbols in shared libraries to be resolved at library creation.
-libwebp_la_LDFLAGS = -no-undefined -version-info 6:2:0
+libwebp_la_LDFLAGS = -no-undefined -version-info 7:0:0
 libwebpincludedir = $(includedir)/webp
 pkgconfig_DATA = libwebp.pc
 
@@ -50,7 +47,7 @@ if BUILD_LIBWEBPDECODER
   libwebpdecoder_la_LIBADD += dsp/libwebpdspdecode.la
   libwebpdecoder_la_LIBADD += utils/libwebputilsdecode.la
 
-  libwebpdecoder_la_LDFLAGS = -no-undefined -version-info 2:2:0
+  libwebpdecoder_la_LDFLAGS = -no-undefined -version-info 3:0:0
   pkgconfig_DATA += libwebpdecoder.pc
 endif
 

src/dec/Makefile.am

@@ -1,22 +1,22 @@
 noinst_LTLIBRARIES = libwebpdecode.la
 
 libwebpdecode_la_SOURCES =
-libwebpdecode_la_SOURCES += alpha.c
-libwebpdecode_la_SOURCES += alphai.h
-libwebpdecode_la_SOURCES += buffer.c
-libwebpdecode_la_SOURCES += common.h
-libwebpdecode_la_SOURCES += decode_vp8.h
-libwebpdecode_la_SOURCES += frame.c
-libwebpdecode_la_SOURCES += idec.c
-libwebpdecode_la_SOURCES += io.c
-libwebpdecode_la_SOURCES += quant.c
-libwebpdecode_la_SOURCES += tree.c
-libwebpdecode_la_SOURCES += vp8.c
-libwebpdecode_la_SOURCES += vp8i.h
-libwebpdecode_la_SOURCES += vp8l.c
-libwebpdecode_la_SOURCES += vp8li.h
-libwebpdecode_la_SOURCES += webp.c
-libwebpdecode_la_SOURCES += webpi.h
+libwebpdecode_la_SOURCES += alpha_dec.c
+libwebpdecode_la_SOURCES += alphai_dec.h
+libwebpdecode_la_SOURCES += buffer_dec.c
+libwebpdecode_la_SOURCES += common_dec.h
+libwebpdecode_la_SOURCES += vp8_dec.h
+libwebpdecode_la_SOURCES += frame_dec.c
+libwebpdecode_la_SOURCES += idec_dec.c
+libwebpdecode_la_SOURCES += io_dec.c
+libwebpdecode_la_SOURCES += quant_dec.c
+libwebpdecode_la_SOURCES += tree_dec.c
+libwebpdecode_la_SOURCES += vp8_dec.c
+libwebpdecode_la_SOURCES += vp8i_dec.h
+libwebpdecode_la_SOURCES += vp8l_dec.c
+libwebpdecode_la_SOURCES += vp8li_dec.h
+libwebpdecode_la_SOURCES += webp_dec.c
+libwebpdecode_la_SOURCES += webpi_dec.h
 
 libwebpdecodeinclude_HEADERS =
 libwebpdecodeinclude_HEADERS += ../webp/decode.h

src/dec/alpha_dec.c

@@ -12,11 +12,11 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
-#include "./alphai.h"
-#include "./vp8i.h"
-#include "./vp8li.h"
+#include "./alphai_dec.h"
+#include "./vp8i_dec.h"
+#include "./vp8li_dec.h"
 #include "../dsp/dsp.h"
-#include "../utils/quant_levels_dec.h"
+#include "../utils/quant_levels_dec_utils.h"
 #include "../utils/utils.h"
 #include "../webp/format_constants.h"
 

src/dec/alphai_dec.h

@@ -14,8 +14,8 @@
 #ifndef WEBP_DEC_ALPHAI_H_
 #define WEBP_DEC_ALPHAI_H_
 
-#include "./webpi.h"
-#include "../utils/filters.h"
+#include "./webpi_dec.h"
+#include "../utils/filters_utils.h"
 
 #ifdef __cplusplus
 extern "C" {

src/dec/buffer_dec.c

@@ -13,8 +13,8 @@
 
 #include <stdlib.h>
 
-#include "./vp8i.h"
-#include "./webpi.h"
+#include "./vp8i_dec.h"
+#include "./webpi_dec.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------

src/dec/frame_dec.c

@@ -12,7 +12,7 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include <stdlib.h>
-#include "./vp8i.h"
+#include "./vp8i_dec.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
@@ -723,7 +723,7 @@ static int AllocateMemory(VP8Decoder* const dec) {
       return VP8SetError(dec, VP8_STATUS_OUT_OF_MEMORY,
                          "no memory during frame initialization.");
     }
-    // down-cast is ok, thanks to WebPSafeAlloc() above.
+    // down-cast is ok, thanks to WebPSafeMalloc() above.
     dec->mem_size_ = (size_t)needed;
   }
 

src/dec/idec_dec.c

@@ -15,9 +15,9 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "./alphai.h"
-#include "./webpi.h"
-#include "./vp8i.h"
+#include "./alphai_dec.h"
+#include "./webpi_dec.h"
+#include "./vp8i_dec.h"
 #include "../utils/utils.h"
 
 // In append mode, buffer allocations increase as multiples of this value.

src/dec/io_dec.c

@@ -13,8 +13,8 @@
 
 #include <assert.h>
 #include <stdlib.h>
-#include "../dec/vp8i.h"
-#include "./webpi.h"
+#include "../dec/vp8i_dec.h"
+#include "./webpi_dec.h"
 #include "../dsp/dsp.h"
 #include "../dsp/yuv.h"
 #include "../utils/utils.h"
@@ -256,7 +256,7 @@ static int Rescale(const uint8_t* src, int src_stride,
 static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) {
   const int mb_h = io->mb_h;
   const int uv_mb_h = (mb_h + 1) >> 1;
-  WebPRescaler* const scaler = &p->scaler_y;
+  WebPRescaler* const scaler = p->scaler_y;
   int num_lines_out = 0;
   if (WebPIsAlphaMode(p->output->colorspace) && io->a != NULL) {
     // Before rescaling, we premultiply the luma directly into the io->y
@@ -267,29 +267,28 @@ static int EmitRescaledYUV(const VP8Io* const io, WebPDecParams* const p) {
                  io->a, io->width, io->mb_w, mb_h, 0);
   }
   num_lines_out = Rescale(io->y, io->y_stride, mb_h, scaler);
-  Rescale(io->u, io->uv_stride, uv_mb_h, &p->scaler_u);
-  Rescale(io->v, io->uv_stride, uv_mb_h, &p->scaler_v);
+  Rescale(io->u, io->uv_stride, uv_mb_h, p->scaler_u);
+  Rescale(io->v, io->uv_stride, uv_mb_h, p->scaler_v);
   return num_lines_out;
 }
 
 static int EmitRescaledAlphaYUV(const VP8Io* const io, WebPDecParams* const p,
                                 int expected_num_lines_out) {
   const WebPYUVABuffer* const buf = &p->output->u.YUVA;
+  uint8_t* const dst_a = buf->a + p->last_y * buf->a_stride;
   if (io->a != NULL) {
-    uint8_t* dst_y = buf->y + p->last_y * buf->y_stride;
-    const uint8_t* src_a = buf->a + p->last_y * buf->a_stride;
-    const int num_lines_out = Rescale(io->a, io->width, io->mb_h, &p->scaler_a);
-    (void)expected_num_lines_out;
+    uint8_t* const dst_y = buf->y + p->last_y * buf->y_stride;
+    const int num_lines_out = Rescale(io->a, io->width, io->mb_h, p->scaler_a);
     assert(expected_num_lines_out == num_lines_out);
     if (num_lines_out > 0) {   // unmultiply the Y
-      WebPMultRows(dst_y, buf->y_stride, src_a, buf->a_stride,
-                   p->scaler_a.dst_width, num_lines_out, 1);
+      WebPMultRows(dst_y, buf->y_stride, dst_a, buf->a_stride,
+                   p->scaler_a->dst_width, num_lines_out, 1);
     }
   } else if (buf->a != NULL) {
     // the user requested alpha, but there is none, set it to opaque.
     assert(p->last_y + expected_num_lines_out <= io->scaled_height);
-    FillAlphaPlane(buf->a + p->last_y * buf->a_stride,
-                   io->scaled_width, expected_num_lines_out, buf->a_stride);
+    FillAlphaPlane(dst_a, io->scaled_width, expected_num_lines_out,
+                   buf->a_stride);
   }
   return 0;
 }
@@ -305,31 +304,42 @@ static int InitYUVRescaler(const VP8Io* const io, WebPDecParams* const p) {
   const int uv_in_height = (io->mb_h + 1) >> 1;
   const size_t work_size = 2 * out_width;   // scratch memory for luma rescaler
   const size_t uv_work_size = 2 * uv_out_width;  // and for each u/v ones
-  size_t tmp_size;
+  size_t tmp_size, rescaler_size;
   rescaler_t* work;
+  WebPRescaler* scalers;
+  const int num_rescalers = has_alpha ? 4 : 3;
 
   tmp_size = (work_size + 2 * uv_work_size) * sizeof(*work);
   if (has_alpha) {
     tmp_size += work_size * sizeof(*work);
   }
-  p->memory = WebPSafeMalloc(1ULL, tmp_size);
+  rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST;
+
+  p->memory = WebPSafeMalloc(1ULL, tmp_size + rescaler_size);
   if (p->memory == NULL) {
     return 0;   // memory error
   }
   work = (rescaler_t*)p->memory;
-  WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
+
+  scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + tmp_size);
+  p->scaler_y = &scalers[0];
+  p->scaler_u = &scalers[1];
+  p->scaler_v = &scalers[2];
+  p->scaler_a = has_alpha ? &scalers[3] : NULL;
+
+  WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h,
                    buf->y, out_width, out_height, buf->y_stride, 1,
                    work);
-  WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
+  WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height,
                    buf->u, uv_out_width, uv_out_height, buf->u_stride, 1,
                    work + work_size);
-  WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
+  WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height,
                    buf->v, uv_out_width, uv_out_height, buf->v_stride, 1,
                    work + work_size + uv_work_size);
   p->emit = EmitRescaledYUV;
 
   if (has_alpha) {
-    WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
+    WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h,
                      buf->a, out_width, out_height, buf->a_stride, 1,
                      work + work_size + 2 * uv_work_size);
     p->emit_alpha = EmitRescaledAlphaYUV;
@@ -349,15 +359,15 @@ static int ExportRGB(WebPDecParams* const p, int y_pos) {
   int num_lines_out = 0;
   // For RGB rescaling, because of the YUV420, current scan position
   // U/V can be +1/-1 line from the Y one.  Hence the double test.
-  while (WebPRescalerHasPendingOutput(&p->scaler_y) &&
-         WebPRescalerHasPendingOutput(&p->scaler_u)) {
+  while (WebPRescalerHasPendingOutput(p->scaler_y) &&
+         WebPRescalerHasPendingOutput(p->scaler_u)) {
     assert(y_pos + num_lines_out < p->output->height);
-    assert(p->scaler_u.y_accum == p->scaler_v.y_accum);
-    WebPRescalerExportRow(&p->scaler_y);
-    WebPRescalerExportRow(&p->scaler_u);
-    WebPRescalerExportRow(&p->scaler_v);
-    convert(p->scaler_y.dst, p->scaler_u.dst, p->scaler_v.dst,
-            dst, p->scaler_y.dst_width);
+    assert(p->scaler_u->y_accum == p->scaler_v->y_accum);
+    WebPRescalerExportRow(p->scaler_y);
+    WebPRescalerExportRow(p->scaler_u);
+    WebPRescalerExportRow(p->scaler_v);
+    convert(p->scaler_y->dst, p->scaler_u->dst, p->scaler_v->dst,
+            dst, p->scaler_y->dst_width);
     dst += buf->stride;
     ++num_lines_out;
   }
@@ -371,15 +381,15 @@ static int EmitRescaledRGB(const VP8Io* const io, WebPDecParams* const p) {
   int num_lines_out = 0;
   while (j < mb_h) {
     const int y_lines_in =
-        WebPRescalerImport(&p->scaler_y, mb_h - j,
+        WebPRescalerImport(p->scaler_y, mb_h - j,
                            io->y + j * io->y_stride, io->y_stride);
     j += y_lines_in;
-    if (WebPRescaleNeededLines(&p->scaler_u, uv_mb_h - uv_j)) {
+    if (WebPRescaleNeededLines(p->scaler_u, uv_mb_h - uv_j)) {
       const int u_lines_in =
-          WebPRescalerImport(&p->scaler_u, uv_mb_h - uv_j,
+          WebPRescalerImport(p->scaler_u, uv_mb_h - uv_j,
                              io->u + uv_j * io->uv_stride, io->uv_stride);
       const int v_lines_in =
-          WebPRescalerImport(&p->scaler_v, uv_mb_h - uv_j,
+          WebPRescalerImport(p->scaler_v, uv_mb_h - uv_j,
                              io->v + uv_j * io->uv_stride, io->uv_stride);
       (void)v_lines_in;   // remove a gcc warning
       assert(u_lines_in == v_lines_in);
@@ -400,13 +410,13 @@ static int ExportAlpha(WebPDecParams* const p, int y_pos, int max_lines_out) {
   int num_lines_out = 0;
   const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
   uint32_t non_opaque = 0;
-  const int width = p->scaler_a.dst_width;
+  const int width = p->scaler_a->dst_width;
 
-  while (WebPRescalerHasPendingOutput(&p->scaler_a) &&
+  while (WebPRescalerHasPendingOutput(p->scaler_a) &&
          num_lines_out < max_lines_out) {
     assert(y_pos + num_lines_out < p->output->height);
-    WebPRescalerExportRow(&p->scaler_a);
-    non_opaque |= WebPDispatchAlpha(p->scaler_a.dst, 0, width, 1, dst, 0);
+    WebPRescalerExportRow(p->scaler_a);
+    non_opaque |= WebPDispatchAlpha(p->scaler_a->dst, 0, width, 1, dst, 0);
     dst += buf->stride;
     ++num_lines_out;
   }
@@ -428,18 +438,18 @@ static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos,
 #endif
   int num_lines_out = 0;
   const WEBP_CSP_MODE colorspace = p->output->colorspace;
-  const int width = p->scaler_a.dst_width;
+  const int width = p->scaler_a->dst_width;
   const int is_premult_alpha = WebPIsPremultipliedMode(colorspace);
   uint32_t alpha_mask = 0x0f;
 
-  while (WebPRescalerHasPendingOutput(&p->scaler_a) &&
+  while (WebPRescalerHasPendingOutput(p->scaler_a) &&
          num_lines_out < max_lines_out) {
     int i;
     assert(y_pos + num_lines_out < p->output->height);
-    WebPRescalerExportRow(&p->scaler_a);
+    WebPRescalerExportRow(p->scaler_a);
     for (i = 0; i < width; ++i) {
       // Fill in the alpha value (converted to 4 bits).
-      const uint32_t alpha_value = p->scaler_a.dst[i] >> 4;
+      const uint32_t alpha_value = p->scaler_a->dst[i] >> 4;
       alpha_dst[2 * i] = (alpha_dst[2 * i] & 0xf0) | alpha_value;
       alpha_mask &= alpha_value;
     }
@@ -455,7 +465,7 @@ static int ExportAlphaRGBA4444(WebPDecParams* const p, int y_pos,
 static int EmitRescaledAlphaRGB(const VP8Io* const io, WebPDecParams* const p,
                                 int expected_num_out_lines) {
   if (io->a != NULL) {
-    WebPRescaler* const scaler = &p->scaler_a;
+    WebPRescaler* const scaler = p->scaler_a;
     int lines_left = expected_num_out_lines;
     const int y_end = p->last_y + lines_left;
     while (lines_left > 0) {
@@ -477,7 +487,9 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
   const size_t work_size = 2 * out_width;   // scratch memory for one rescaler
   rescaler_t* work;  // rescalers work area
   uint8_t* tmp;   // tmp storage for scaled YUV444 samples before RGB conversion
-  size_t tmp_size1, tmp_size2, total_size;
+  size_t tmp_size1, tmp_size2, total_size, rescaler_size;
+  WebPRescaler* scalers;
+  const int num_rescalers = has_alpha ? 4 : 3;
 
   tmp_size1 = 3 * work_size;
   tmp_size2 = 3 * out_width;
@@ -486,26 +498,35 @@ static int InitRGBRescaler(const VP8Io* const io, WebPDecParams* const p) {
     tmp_size2 += out_width;
   }
   total_size = tmp_size1 * sizeof(*work) + tmp_size2 * sizeof(*tmp);
-  p->memory = WebPSafeMalloc(1ULL, total_size);
+  rescaler_size = num_rescalers * sizeof(*p->scaler_y) + WEBP_ALIGN_CST;
+
+  p->memory = WebPSafeMalloc(1ULL, total_size + rescaler_size);
   if (p->memory == NULL) {
     return 0;   // memory error
   }
   work = (rescaler_t*)p->memory;
   tmp = (uint8_t*)(work + tmp_size1);
-  WebPRescalerInit(&p->scaler_y, io->mb_w, io->mb_h,
+
+  scalers = (WebPRescaler*)WEBP_ALIGN((const uint8_t*)work + total_size);
+  p->scaler_y = &scalers[0];
+  p->scaler_u = &scalers[1];
+  p->scaler_v = &scalers[2];
+  p->scaler_a = has_alpha ? &scalers[3] : NULL;
+
+  WebPRescalerInit(p->scaler_y, io->mb_w, io->mb_h,
                    tmp + 0 * out_width, out_width, out_height, 0, 1,
                    work + 0 * work_size);
-  WebPRescalerInit(&p->scaler_u, uv_in_width, uv_in_height,
+  WebPRescalerInit(p->scaler_u, uv_in_width, uv_in_height,
                    tmp + 1 * out_width, out_width, out_height, 0, 1,
                    work + 1 * work_size);
-  WebPRescalerInit(&p->scaler_v, uv_in_width, uv_in_height,
+  WebPRescalerInit(p->scaler_v, uv_in_width, uv_in_height,
                    tmp + 2 * out_width, out_width, out_height, 0, 1,
                    work + 2 * work_size);
   p->emit = EmitRescaledRGB;
   WebPInitYUV444Converters();
 
   if (has_alpha) {
-    WebPRescalerInit(&p->scaler_a, io->mb_w, io->mb_h,
+    WebPRescalerInit(p->scaler_a, io->mb_w, io->mb_h,
                      tmp + 3 * out_width, out_width, out_height, 0, 1,
                      work + 3 * work_size);
     p->emit_alpha = EmitRescaledAlphaRGB;

src/dec/quant_dec.c

@@ -11,7 +11,7 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./vp8i.h"
+#include "./vp8i_dec.h"
 
 static WEBP_INLINE int clip(int v, int M) {
   return v < 0 ? 0 : v > M ? M : v;

src/dec/tree_dec.c

@@ -11,10 +11,13 @@
 //
 // Author: Skal (pascal.massimino@gmail.com)
 
-#include "./vp8i.h"
-#include "../utils/bit_reader_inl.h"
+#include "./vp8i_dec.h"
+#include "../utils/bit_reader_inl_utils.h"
 
+#if !defined(__arm__) && !defined(_M_ARM) && !defined(__aarch64__)
+// using a table is ~1-2% slower on ARM. Prefer the coded-tree approach then.
 #define USE_GENERIC_TREE
+#endif
 
 #ifdef USE_GENERIC_TREE
 static const int8_t kYModesIntra4[18] = {

src/dec/vp8_dec.c

@@ -13,11 +13,11 @@
 
 #include <stdlib.h>
 
-#include "./alphai.h"
-#include "./vp8i.h"
-#include "./vp8li.h"
-#include "./webpi.h"
-#include "../utils/bit_reader_inl.h"
+#include "./alphai_dec.h"
+#include "./vp8i_dec.h"
+#include "./vp8li_dec.h"
+#include "./webpi_dec.h"
+#include "../utils/bit_reader_inl_utils.h"
 #include "../utils/utils.h"
 
 //------------------------------------------------------------------------------
@@ -26,6 +26,16 @@ int WebPGetDecoderVersion(void) {
   return (DEC_MAJ_VERSION << 16) | (DEC_MIN_VERSION << 8) | DEC_REV_VERSION;
 }
 
+//------------------------------------------------------------------------------
+// Signature and pointer-to-function for GetCoeffs() variants below.
+
+typedef int (*GetCoeffsFunc)(VP8BitReader* const br,
+                             const VP8BandProbas* const prob[],
+                             int ctx, const quant_t dq, int n, int16_t* out);
+static volatile GetCoeffsFunc GetCoeffs = NULL;
+
+static void InitGetCoeffs(void);
+
 //------------------------------------------------------------------------------
 // VP8Decoder
 
@@ -51,6 +61,7 @@ VP8Decoder* VP8New(void) {
     WebPGetWorkerInterface()->Init(&dec->worker_);
     dec->ready_ = 0;
     dec->num_parts_minus_one_ = 0;
+    InitGetCoeffs();
   }
   return dec;
 }
@@ -273,12 +284,14 @@ int VP8GetHeaders(VP8Decoder* const dec, VP8Io* const io) {
     frm_hdr->profile_ = (bits >> 1) & 7;
     frm_hdr->show_ = (bits >> 4) & 1;
     frm_hdr->partition_length_ = (bits >> 5);
-    if (frm_hdr->profile_ > 3)
+    if (frm_hdr->profile_ > 3) {
       return VP8SetError(dec, VP8_STATUS_BITSTREAM_ERROR,
                          "Incorrect keyframe parameters.");
-    if (!frm_hdr->show_)
+    }
+    if (!frm_hdr->show_) {
       return VP8SetError(dec, VP8_STATUS_UNSUPPORTED_FEATURE,
                          "Frame not displayable.");
+    }
     buf += 3;
     buf_size -= 3;
   }
@@ -420,8 +433,9 @@ static int GetLargeValue(VP8BitReader* const br, const uint8_t* const p) {
 }
 
 // Returns the position of the last non-zero coeff plus one
-static int GetCoeffs(VP8BitReader* const br, const VP8BandProbas* const prob[],
-                     int ctx, const quant_t dq, int n, int16_t* out) {
+static int GetCoeffsFast(VP8BitReader* const br,
+                         const VP8BandProbas* const prob[],
+                         int ctx, const quant_t dq, int n, int16_t* out) {
   const uint8_t* p = prob[n]->probas_[ctx];
   for (; n < 16; ++n) {
     if (!VP8GetBit(br, p[0])) {
@@ -447,6 +461,46 @@ static int GetCoeffs(VP8BitReader* const br, const VP8BandProbas* const prob[],
   return 16;
 }
 
+// This version of GetCoeffs() uses VP8GetBitAlt() which is an alternate version
+// of VP8GetBitAlt() targeting specific platforms.
+static int GetCoeffsAlt(VP8BitReader* const br,
+                        const VP8BandProbas* const prob[],
+                        int ctx, const quant_t dq, int n, int16_t* out) {
+  const uint8_t* p = prob[n]->probas_[ctx];
+  for (; n < 16; ++n) {
+    if (!VP8GetBitAlt(br, p[0])) {
+      return n;  // previous coeff was last non-zero coeff
+    }
+    while (!VP8GetBitAlt(br, p[1])) {       // sequence of zero coeffs
+      p = prob[++n]->probas_[0];
+      if (n == 16) return 16;
+    }
+    {        // non zero coeff
+      const VP8ProbaArray* const p_ctx = &prob[n + 1]->probas_[0];
+      int v;
+      if (!VP8GetBitAlt(br, p[2])) {
+        v = 1;
+        p = p_ctx[1];
+      } else {
+        v = GetLargeValue(br, p);
+        p = p_ctx[2];
+      }
+      out[kZigzag[n]] = VP8GetSigned(br, v) * dq[n > 0];
+    }
+  }
+  return 16;
+}
+
+WEBP_TSAN_IGNORE_FUNCTION static void InitGetCoeffs(void) {
+  if (GetCoeffs == NULL) {
+    if (VP8GetCPUInfo != NULL && VP8GetCPUInfo(kSlowSSSE3)) {
+      GetCoeffs = GetCoeffsAlt;
+    } else {
+      GetCoeffs = GetCoeffsFast;
+    }
+  }
+}
+
 static WEBP_INLINE uint32_t NzCodeBits(uint32_t nz_coeffs, int nz, int dc_nz) {
   nz_coeffs <<= 2;
   nz_coeffs |= (nz > 3) ? 3 : (nz > 1) ? 2 : dc_nz;

src/dec/vp8_dec.h

@@ -33,7 +33,7 @@ extern "C" {
 //   /* customize io's functions (setup()/put()/teardown()) if needed. */
 //
 //   VP8Decoder* dec = VP8New();
-//   bool ok = VP8Decode(dec);
+//   int ok = VP8Decode(dec, &io);
 //   if (!ok) printf("Error: %s\n", VP8StatusMessage(dec));
 //   VP8Delete(dec);
 //   return ok;

src/dec/vp8i_dec.h

@@ -15,11 +15,11 @@
 #define WEBP_DEC_VP8I_H_
 
 #include <string.h>     // for memcpy()
-#include "./common.h"
-#include "./vp8li.h"
-#include "../utils/bit_reader.h"
-#include "../utils/random.h"
-#include "../utils/thread.h"
+#include "./common_dec.h"
+#include "./vp8li_dec.h"
+#include "../utils/bit_reader_utils.h"
+#include "../utils/random_utils.h"
+#include "../utils/thread_utils.h"
 #include "../dsp/dsp.h"
 
 #ifdef __cplusplus
@@ -31,8 +31,8 @@ extern "C" {
 
 // version numbers
 #define DEC_MAJ_VERSION 0
-#define DEC_MIN_VERSION 5
-#define DEC_REV_VERSION 2
+#define DEC_MIN_VERSION 6
+#define DEC_REV_VERSION 0
 
 // YUV-cache parameters. Cache is 32-bytes wide (= one cacheline).
 // Constraints are: We need to store one 16x16 block of luma samples (y),

src/dec/vp8l_dec.c

@@ -14,13 +14,14 @@
 
 #include <stdlib.h>
 
-#include "./alphai.h"
-#include "./vp8li.h"
+#include "./alphai_dec.h"
+#include "./vp8li_dec.h"
 #include "../dsp/dsp.h"
 #include "../dsp/lossless.h"
+#include "../dsp/lossless_common.h"
 #include "../dsp/yuv.h"
-#include "../utils/endian_inl.h"
-#include "../utils/huffman.h"
+#include "../utils/endian_inl_utils.h"
+#include "../utils/huffman_utils.h"
 #include "../utils/utils.h"
 
 #define NUM_ARGB_CACHE_ROWS          16
@@ -547,11 +548,14 @@ static int EmitRescaledRowsRGBA(const VP8LDecoder* const dec,
     uint8_t* const row_out = out + num_lines_out * out_stride;
     const int lines_left = mb_h - num_lines_in;
     const int needed_lines = WebPRescaleNeededLines(dec->rescaler, lines_left);
+    int lines_imported;
     assert(needed_lines > 0 && needed_lines <= lines_left);
     WebPMultARGBRows(row_in, in_stride,
                      dec->rescaler->src_width, needed_lines, 0);
-    WebPRescalerImport(dec->rescaler, lines_left, row_in, in_stride);
-    num_lines_in += needed_lines;
+    lines_imported =
+        WebPRescalerImport(dec->rescaler, lines_left, row_in, in_stride);
+    assert(lines_imported == needed_lines);
+    num_lines_in += lines_imported;
     num_lines_out += Export(dec->rescaler, colorspace, out_stride, row_out);
   }
   return num_lines_out;
@@ -623,9 +627,12 @@ static int EmitRescaledRowsYUVA(const VP8LDecoder* const dec,
   while (num_lines_in < mb_h) {
     const int lines_left = mb_h - num_lines_in;
     const int needed_lines = WebPRescaleNeededLines(dec->rescaler, lines_left);
+    int lines_imported;
     WebPMultARGBRows(in, in_stride, dec->rescaler->src_width, needed_lines, 0);
-    WebPRescalerImport(dec->rescaler, lines_left, in, in_stride);
-    num_lines_in += needed_lines;
+    lines_imported =
+        WebPRescalerImport(dec->rescaler, lines_left, in, in_stride);
+    assert(lines_imported == needed_lines);
+    num_lines_in += lines_imported;
     in += needed_lines * in_stride;
     y_pos += ExportYUVA(dec, y_pos);
   }
@@ -705,13 +712,15 @@ static void ApplyInverseTransforms(VP8LDecoder* const dec, int num_rows,
   uint32_t* const rows_out = dec->argb_cache_;
 
   // Inverse transforms.
-  // TODO: most transforms only need to operate on the cropped region only.
-  memcpy(rows_out, rows_in, cache_pixs * sizeof(*rows_out));
   while (n-- > 0) {
     VP8LTransform* const transform = &dec->transforms_[n];
     VP8LInverseTransform(transform, start_row, end_row, rows_in, rows_out);
     rows_in = rows_out;
   }
+  if (rows_in != rows_out) {
+    // No transform called, hence just copy.
+    memcpy(rows_out, rows_in, cache_pixs * sizeof(*rows_out));
+  }
 }
 
 // Processes (transforms, scales & color-converts) the rows decoded after the
@@ -1003,12 +1012,13 @@ static int DecodeAlphaData(VP8LDecoder* const dec, uint8_t* const data,
       ok = 0;
       goto End;
     }
-    assert(br->eos_ == VP8LIsEndOfStream(br));
+    br->eos_ = VP8LIsEndOfStream(br);
   }
   // Process the remaining rows corresponding to last row-block.
   ExtractPalettedAlphaRows(dec, row > last_row ? last_row : row);
 
  End:
+  br->eos_ = VP8LIsEndOfStream(br);
   if (!ok || (br->eos_ && pos < end)) {
     ok = 0;
     dec->status_ = br->eos_ ? VP8_STATUS_SUSPENDED
@@ -1081,11 +1091,12 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
     VP8LFillBitWindow(br);
     if (htree_group->use_packed_table) {
       code = ReadPackedSymbols(htree_group, br, src);
+      if (VP8LIsEndOfStream(br)) break;
       if (code == PACKED_NON_LITERAL_CODE) goto AdvanceByOne;
     } else {
       code = ReadSymbol(htree_group->htrees[GREEN], br);
     }
-    if (br->eos_) break;  // early out
+    if (VP8LIsEndOfStream(br)) break;
     if (code < NUM_LITERAL_CODES) {  // Literal
       if (htree_group->is_trivial_literal) {
         *src = htree_group->literal_arb | (code << 8);
@@ -1095,7 +1106,7 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
         VP8LFillBitWindow(br);
         blue = ReadSymbol(htree_group->htrees[BLUE], br);
         alpha = ReadSymbol(htree_group->htrees[ALPHA], br);
-        if (br->eos_) break;
+        if (VP8LIsEndOfStream(br)) break;
         *src = ((uint32_t)alpha << 24) | (red << 16) | (code << 8) | blue;
       }
     AdvanceByOne:
@@ -1123,7 +1134,7 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
       VP8LFillBitWindow(br);
       dist_code = GetCopyDistance(dist_symbol, br);
       dist = PlaneCodeToDistance(width, dist_code);
-      if (br->eos_) break;
+      if (VP8LIsEndOfStream(br)) break;
       if (src - data < (ptrdiff_t)dist || src_end - src < (ptrdiff_t)length) {
         goto Error;
       } else {
@@ -1160,9 +1171,9 @@ static int DecodeImageData(VP8LDecoder* const dec, uint32_t* const data,
     } else {  // Not reached
       goto Error;
     }
-    assert(br->eos_ == VP8LIsEndOfStream(br));
   }
 
+  br->eos_ = VP8LIsEndOfStream(br);
   if (dec->incremental_ && br->eos_ && src < src_end) {
     RestoreState(dec);
   } else if (!br->eos_) {
@@ -1210,8 +1221,9 @@ static int ExpandColorMap(int num_colors, VP8LTransform* const transform) {
       // Equivalent to AddPixelEq(), on a byte-basis.
       new_data[i] = (data[i] + new_data[i - 4]) & 0xff;
     }
-    for (; i < 4 * final_num_colors; ++i)
+    for (; i < 4 * final_num_colors; ++i) {
       new_data[i] = 0;  // black tail.
+    }
     WebPSafeFree(transform->data_);
     transform->data_ = new_color_map;
   }
@@ -1482,9 +1494,8 @@ static void ExtractAlphaRows(VP8LDecoder* const dec, int last_row) {
     const int cache_pixs = width * num_rows_to_process;
     uint8_t* const dst = output + width * cur_row;
     const uint32_t* const src = dec->argb_cache_;
-    int i;
     ApplyInverseTransforms(dec, num_rows_to_process, in);
-    for (i = 0; i < cache_pixs; ++i) dst[i] = (src[i] >> 8) & 0xff;
+    WebPExtractGreen(src, dst, cache_pixs);
     AlphaApplyFilter(alph_dec,
                      cur_row, cur_row + num_rows_to_process, dst, width);
     num_rows -= num_rows_to_process;
@@ -1552,6 +1563,8 @@ int VP8LDecodeAlphaImageStream(ALPHDecoder* const alph_dec, int last_row) {
     return 1;  // done
   }
 
+  if (!alph_dec->use_8b_decode_) WebPInitAlphaProcessing();
+
   // Decode (with special row processing).
   return alph_dec->use_8b_decode_ ?
       DecodeAlphaData(dec, (uint8_t*)dec->pixels_, dec->width_, dec->height_,

src/dec/vp8li_dec.h

@@ -16,10 +16,10 @@
 #define WEBP_DEC_VP8LI_H_
 
 #include <string.h>     // for memcpy()
-#include "./webpi.h"
-#include "../utils/bit_reader.h"
-#include "../utils/color_cache.h"
-#include "../utils/huffman.h"
+#include "./webpi_dec.h"
+#include "../utils/bit_reader_utils.h"
+#include "../utils/color_cache_utils.h"
+#include "../utils/huffman_utils.h"
 
 #ifdef __cplusplus
 extern "C" {

src/dec/webp_dec.c

@@ -13,9 +13,9 @@
 
 #include <stdlib.h>
 
-#include "./vp8i.h"
-#include "./vp8li.h"
-#include "./webpi.h"
+#include "./vp8i_dec.h"
+#include "./vp8li_dec.h"
+#include "./webpi_dec.h"
 #include "../utils/utils.h"
 #include "../webp/mux_types.h"  // ALPHA_FLAG
 
@@ -39,8 +39,8 @@
 //   20..23  VP8X flags bit-map corresponding to the chunk-types present.
 //   24..26  Width of the Canvas Image.
 //   27..29  Height of the Canvas Image.
-// There can be extra chunks after the "VP8X" chunk (ICCP, FRGM, ANMF, VP8,
-// VP8L, XMP, EXIF  ...)
+// There can be extra chunks after the "VP8X" chunk (ICCP, ANMF, VP8, VP8L,
+// XMP, EXIF  ...)
 // All sizes are in little-endian order.
 // Note: chunk data size must be padded to multiple of 2 when written.
 
@@ -289,7 +289,6 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
   int found_riff = 0;
   int found_vp8x = 0;
   int animation_present = 0;
-  int fragments_present = 0;
   const int have_all_data = (headers != NULL) ? headers->have_all_data : 0;
 
   VP8StatusCode status;
@@ -318,7 +317,6 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
       return status;  // Wrong VP8X / insufficient data.
     }
     animation_present = !!(flags & ANIMATION_FLAG);
-    fragments_present = !!(flags & FRAGMENTS_FLAG);
     if (!found_riff && found_vp8x) {
       // Note: This restriction may be removed in the future, if it becomes
       // necessary to send VP8X chunk to the decoder.
@@ -330,8 +328,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
 
     image_width = canvas_width;
     image_height = canvas_height;
-    if (found_vp8x && (animation_present || fragments_present) &&
-        headers == NULL) {
+    if (found_vp8x && animation_present && headers == NULL) {
       status = VP8_STATUS_OK;
       goto ReturnWidthHeight;  // Just return features from VP8X header.
     }
@@ -362,7 +359,7 @@ static VP8StatusCode ParseHeadersInternal(const uint8_t* data,
     return VP8_STATUS_BITSTREAM_ERROR;
   }
 
-  if (format != NULL && !(animation_present || fragments_present)) {
+  if (format != NULL && !animation_present) {
     *format = hdrs.is_lossless ? 2 : 1;
   }
 

src/dec/webpi_dec.h

@@ -18,8 +18,8 @@
 extern "C" {
 #endif
 
-#include "../utils/rescaler.h"
-#include "./decode_vp8.h"
+#include "../utils/rescaler_utils.h"
+#include "./vp8_dec.h"
 
 //------------------------------------------------------------------------------
 // WebPDecParams: Decoding output parameters. Transient internal object.
@@ -38,27 +38,18 @@ struct WebPDecParams {
 
   int last_y;                 // coordinate of the line that was last output
   const WebPDecoderOptions* options;  // if not NULL, use alt decoding features
-  // rescalers
-  WebPRescaler scaler_y, scaler_u, scaler_v, scaler_a;
+
+  WebPRescaler* scaler_y, *scaler_u, *scaler_v, *scaler_a;  // rescalers
   void* memory;                  // overall scratch memory for the output work.
 
   OutputFunc emit;               // output RGB or YUV samples
   OutputAlphaFunc emit_alpha;    // output alpha channel
   OutputRowFunc emit_alpha_row;  // output one line of rescaled alpha values
-
-  WebPDecBuffer* final_output;   // In case the user supplied a slow-memory
-                                 // output, we decode image in temporary buffer
-                                 // (this::output) and copy it here.
-  WebPDecBuffer tmp_buffer;      // this::output will point to this one in case
-                                 // of slow memory.
 };
 
 // Should be called first, before any use of the WebPDecParams object.
 void WebPResetDecParams(WebPDecParams* const params);
 
-// Delete all memory (after an error occurred, for instance)
-void WebPFreeDecParams(WebPDecParams* const params);
-
 //------------------------------------------------------------------------------
 // Header parsing helpers
 

src/demux/Makefile.am

@@ -9,6 +9,6 @@ libwebpdemuxinclude_HEADERS += ../webp/mux_types.h
 libwebpdemuxinclude_HEADERS += ../webp/types.h
 
 libwebpdemux_la_LIBADD = ../libwebp.la
-libwebpdemux_la_LDFLAGS = -no-undefined -version-info 2:1:0
+libwebpdemux_la_LDFLAGS = -no-undefined -version-info 2:2:0
 libwebpdemuxincludedir = $(includedir)/webp
 pkgconfig_DATA = libwebpdemux.pc

src/demux/demux.c

@@ -25,7 +25,7 @@
 
 #define DMUX_MAJ_VERSION 0
 #define DMUX_MIN_VERSION 3
-#define DMUX_REV_VERSION 1
+#define DMUX_REV_VERSION 2
 
 typedef struct {
   size_t start_;        // start location of the data
@@ -590,7 +590,6 @@ static int CheckFrameBounds(const Frame* const frame, int exact,
 
 static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
   const int is_animation = !!(dmux->feature_flags_ & ANIMATION_FLAG);
-  const int is_fragmented = !!(dmux->feature_flags_ & FRAGMENTS_FLAG);
   const Frame* f = dmux->frames_;
 
   if (dmux->state_ == WEBP_DEMUX_PARSING_HEADER) return 1;
@@ -598,7 +597,7 @@ static int IsValidExtendedFormat(const WebPDemuxer* const dmux) {
   if (dmux->canvas_width_ <= 0 || dmux->canvas_height_ <= 0) return 0;
   if (dmux->loop_count_ < 0) return 0;
   if (dmux->state_ == WEBP_DEMUX_DONE && dmux->frames_ == NULL) return 0;
-  if (is_fragmented) return 0;
+  if (dmux->feature_flags_ & ~ALL_VALID_FLAGS) return 0;  // invalid bitstream
 
   while (f != NULL) {
     const int cur_frame_set = f->frame_num_;

src/demux/libwebpdemux.rc

@@ -0,0 +1,41 @@
+#define APSTUDIO_READONLY_SYMBOLS
+#include "winres.h"
+#undef APSTUDIO_READONLY_SYMBOLS
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+
+VS_VERSION_INFO VERSIONINFO
+ FILEVERSION 0,3,0,2
+ PRODUCTVERSION 0,3,0,2
+ FILEFLAGSMASK 0x3fL
+#ifdef _DEBUG
+ FILEFLAGS 0x1L
+#else
+ FILEFLAGS 0x0L
+#endif
+ FILEOS 0x40004L
+ FILETYPE 0x2L
+ FILESUBTYPE 0x0L
+BEGIN
+    BLOCK "StringFileInfo"
+    BEGIN
+        BLOCK "040904b0"
+        BEGIN
+            VALUE "CompanyName", "Google, Inc."
+            VALUE "FileDescription", "libwebpdemux DLL"
+            VALUE "FileVersion", "0.3.2"
+            VALUE "InternalName", "libwebpdemux.dll"
+            VALUE "LegalCopyright", "Copyright (C) 2017"
+            VALUE "OriginalFilename", "libwebpdemux.dll"
+            VALUE "ProductName", "WebP Image Demuxer"
+            VALUE "ProductVersion", "0.3.2"
+        END
+    END
+    BLOCK "VarFileInfo"
+    BEGIN
+        VALUE "Translation", 0x409, 1200
+    END
+END
+
+#endif    // English (United States) resources

src/dsp/Makefile.am

@@ -2,7 +2,8 @@ noinst_LTLIBRARIES = libwebpdsp.la libwebpdsp_avx2.la
 noinst_LTLIBRARIES += libwebpdsp_sse2.la libwebpdspdecode_sse2.la
 noinst_LTLIBRARIES += libwebpdsp_sse41.la libwebpdspdecode_sse41.la
 noinst_LTLIBRARIES += libwebpdsp_neon.la libwebpdspdecode_neon.la
-noinst_LTLIBRARIES += libwebpdspdecode_msa.la
+noinst_LTLIBRARIES += libwebpdsp_msa.la libwebpdspdecode_msa.la
+noinst_LTLIBRARIES += libwebpdspdecode_wasm.la
 
 if BUILD_LIBWEBPDECODER
   noinst_LTLIBRARIES += libwebpdspdecode.la
@@ -25,6 +26,7 @@ COMMON_SOURCES += filters.c
 COMMON_SOURCES += filters_mips_dsp_r2.c
 COMMON_SOURCES += lossless.c
 COMMON_SOURCES += lossless.h
+COMMON_SOURCES += lossless_common.h
 COMMON_SOURCES += lossless_mips_dsp_r2.c
 COMMON_SOURCES += mips_macro.h
 COMMON_SOURCES += rescaler.c
@@ -49,6 +51,7 @@ ENC_SOURCES += enc_mips_dsp_r2.c
 ENC_SOURCES += lossless_enc.c
 ENC_SOURCES += lossless_enc_mips32.c
 ENC_SOURCES += lossless_enc_mips_dsp_r2.c
+ENC_SOURCES += ssim.c
 
 libwebpdsp_avx2_la_SOURCES =
 libwebpdsp_avx2_la_SOURCES += enc_avx2.c
@@ -73,25 +76,37 @@ libwebpdspdecode_sse2_la_CPPFLAGS = $(libwebpdsp_sse2_la_CPPFLAGS)
 libwebpdspdecode_sse2_la_CFLAGS = $(libwebpdsp_sse2_la_CFLAGS)
 
 libwebpdspdecode_neon_la_SOURCES =
+libwebpdspdecode_neon_la_SOURCES += alpha_processing_neon.c
 libwebpdspdecode_neon_la_SOURCES += dec_neon.c
+libwebpdspdecode_neon_la_SOURCES += filters_neon.c
 libwebpdspdecode_neon_la_SOURCES += lossless_neon.c
 libwebpdspdecode_neon_la_SOURCES += neon.h
 libwebpdspdecode_neon_la_SOURCES += rescaler_neon.c
 libwebpdspdecode_neon_la_SOURCES += upsampling_neon.c
+libwebpdspdecode_neon_la_SOURCES += yuv_neon.c
 libwebpdspdecode_neon_la_CPPFLAGS = $(libwebpdsp_neon_la_CPPFLAGS)
 libwebpdspdecode_neon_la_CFLAGS = $(libwebpdsp_neon_la_CFLAGS)
 
 libwebpdspdecode_msa_la_SOURCES =
 libwebpdspdecode_msa_la_SOURCES += dec_msa.c
+libwebpdspdecode_msa_la_SOURCES += filters_msa.c
+libwebpdspdecode_msa_la_SOURCES += lossless_msa.c
 libwebpdspdecode_msa_la_SOURCES += msa_macro.h
-libwebpdspdecode_msa_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
-libwebpdspdecode_msa_la_CFLAGS = $(AM_CFLAGS)
+libwebpdspdecode_msa_la_SOURCES += rescaler_msa.c
+libwebpdspdecode_msa_la_SOURCES += upsampling_msa.c
+libwebpdspdecode_msa_la_CPPFLAGS = $(libwebpdsp_msa_la_CPPFLAGS)
+libwebpdspdecode_msa_la_CFLAGS = $(libwebpdsp_msa_la_CFLAGS)
+
+# WASM is not fully integrated into configure; the addition here keeps source
+# extraction by cmake simple.
+libwebpdspdecode_wasm_la_SOURCES = dec_wasm.c
 
 libwebpdsp_sse2_la_SOURCES =
 libwebpdsp_sse2_la_SOURCES += argb_sse2.c
 libwebpdsp_sse2_la_SOURCES += cost_sse2.c
 libwebpdsp_sse2_la_SOURCES += enc_sse2.c
 libwebpdsp_sse2_la_SOURCES += lossless_enc_sse2.c
+libwebpdsp_sse2_la_SOURCES += ssim_sse2.c
 libwebpdsp_sse2_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
 libwebpdsp_sse2_la_CFLAGS = $(AM_CFLAGS) $(SSE2_FLAGS)
 libwebpdsp_sse2_la_LIBADD = libwebpdspdecode_sse2.la
@@ -110,10 +125,17 @@ libwebpdsp_neon_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
 libwebpdsp_neon_la_CFLAGS = $(AM_CFLAGS) $(NEON_FLAGS)
 libwebpdsp_neon_la_LIBADD = libwebpdspdecode_neon.la
 
+libwebpdsp_msa_la_SOURCES =
+libwebpdsp_msa_la_SOURCES += enc_msa.c
+libwebpdsp_msa_la_SOURCES += lossless_enc_msa.c
+libwebpdsp_msa_la_CPPFLAGS = $(libwebpdsp_la_CPPFLAGS)
+libwebpdsp_msa_la_CFLAGS = $(AM_CFLAGS)
+libwebpdsp_msa_la_LIBADD = libwebpdspdecode_msa.la
+
 libwebpdsp_la_SOURCES = $(COMMON_SOURCES) $(ENC_SOURCES)
 
 noinst_HEADERS =
-noinst_HEADERS += ../dec/decode_vp8.h
+noinst_HEADERS += ../dec/vp8_dec.h
 noinst_HEADERS += ../webp/decode.h
 
 libwebpdsp_la_CPPFLAGS =
@@ -124,7 +146,7 @@ libwebpdsp_la_LIBADD =
 libwebpdsp_la_LIBADD += libwebpdsp_avx2.la libwebpdsp_sse2.la
 libwebpdsp_la_LIBADD += libwebpdsp_sse41.la
 libwebpdsp_la_LIBADD += libwebpdsp_neon.la
-libwebpdsp_la_LIBADD += libwebpdspdecode_msa.la
+libwebpdsp_la_LIBADD += libwebpdsp_msa.la
 
 if BUILD_LIBWEBPDECODER
   libwebpdspdecode_la_SOURCES = $(COMMON_SOURCES)

src/dsp/alpha_processing.c

@@ -284,9 +284,9 @@ static void ApplyAlphaMultiply_16b(uint8_t* rgba4444,
 #endif
 }
 
-static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
-                         int width, int height,
-                         uint8_t* dst, int dst_stride) {
+static int DispatchAlpha_C(const uint8_t* alpha, int alpha_stride,
+                           int width, int height,
+                           uint8_t* dst, int dst_stride) {
   uint32_t alpha_mask = 0xff;
   int i, j;
 
@@ -303,9 +303,9 @@ static int DispatchAlpha(const uint8_t* alpha, int alpha_stride,
   return (alpha_mask != 0xff);
 }
 
-static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride,
-                                 int width, int height,
-                                 uint32_t* dst, int dst_stride) {
+static void DispatchAlphaToGreen_C(const uint8_t* alpha, int alpha_stride,
+                                   int width, int height,
+                                   uint32_t* dst, int dst_stride) {
   int i, j;
   for (j = 0; j < height; ++j) {
     for (i = 0; i < width; ++i) {
@@ -316,9 +316,9 @@ static void DispatchAlphaToGreen(const uint8_t* alpha, int alpha_stride,
   }
 }
 
-static int ExtractAlpha(const uint8_t* argb, int argb_stride,
-                        int width, int height,
-                        uint8_t* alpha, int alpha_stride) {
+static int ExtractAlpha_C(const uint8_t* argb, int argb_stride,
+                          int width, int height,
+                          uint8_t* alpha, int alpha_stride) {
   uint8_t alpha_mask = 0xff;
   int i, j;
 
@@ -334,11 +334,17 @@ static int ExtractAlpha(const uint8_t* argb, int argb_stride,
   return (alpha_mask == 0xff);
 }
 
+static void ExtractGreen_C(const uint32_t* argb, uint8_t* alpha, int size) {
+  int i;
+  for (i = 0; i < size; ++i) alpha[i] = argb[i] >> 8;
+}
+
 void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int);
 void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int);
 int (*WebPDispatchAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
 void (*WebPDispatchAlphaToGreen)(const uint8_t*, int, int, int, uint32_t*, int);
 int (*WebPExtractAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
+void (*WebPExtractGreen)(const uint32_t* argb, uint8_t* alpha, int size);
 
 //------------------------------------------------------------------------------
 // Init function
@@ -346,6 +352,7 @@ int (*WebPExtractAlpha)(const uint8_t*, int, int, int, uint8_t*, int);
 extern void WebPInitAlphaProcessingMIPSdspR2(void);
 extern void WebPInitAlphaProcessingSSE2(void);
 extern void WebPInitAlphaProcessingSSE41(void);
+extern void WebPInitAlphaProcessingNEON(void);
 
 static volatile VP8CPUInfo alpha_processing_last_cpuinfo_used =
     (VP8CPUInfo)&alpha_processing_last_cpuinfo_used;
@@ -357,9 +364,11 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
   WebPMultRow = WebPMultRowC;
   WebPApplyAlphaMultiply = ApplyAlphaMultiply;
   WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply_16b;
-  WebPDispatchAlpha = DispatchAlpha;
-  WebPDispatchAlphaToGreen = DispatchAlphaToGreen;
-  WebPExtractAlpha = ExtractAlpha;
+
+  WebPDispatchAlpha = DispatchAlpha_C;
+  WebPDispatchAlphaToGreen = DispatchAlphaToGreen_C;
+  WebPExtractAlpha = ExtractAlpha_C;
+  WebPExtractGreen = ExtractGreen_C;
 
   // If defined, use CPUInfo() to overwrite some pointers with faster versions.
   if (VP8GetCPUInfo != NULL) {
@@ -373,6 +382,11 @@ WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessing(void) {
 #endif
     }
 #endif
+#if defined(WEBP_USE_NEON)
+    if (VP8GetCPUInfo(kNEON)) {
+      WebPInitAlphaProcessingNEON();
+    }
+#endif
 #if defined(WEBP_USE_MIPS_DSP_R2)
     if (VP8GetCPUInfo(kMIPSdspR2)) {
       WebPInitAlphaProcessingMIPSdspR2();

src/dsp/alpha_processing_neon.c

@@ -0,0 +1,191 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING file in the root of the source
+// tree. An additional intellectual property rights grant can be found
+// in the file PATENTS. All contributing project authors may
+// be found in the AUTHORS file in the root of the source tree.
+// -----------------------------------------------------------------------------
+//
+// Utilities for processing transparent channel, NEON version.
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include "./dsp.h"
+
+#if defined(WEBP_USE_NEON)
+
+#include "./neon.h"
+
+//------------------------------------------------------------------------------
+
+#define MULTIPLIER(a) ((a) * 0x8081)
+#define PREMULTIPLY(x, m) (((x) * (m)) >> 23)
+
+#define MULTIPLY_BY_ALPHA(V, ALPHA, OTHER) do {                        \
+  const uint8x8_t alpha = (V).val[(ALPHA)];                            \
+  const uint16x8_t r1 = vmull_u8((V).val[1], alpha);                   \
+  const uint16x8_t g1 = vmull_u8((V).val[2], alpha);                   \
+  const uint16x8_t b1 = vmull_u8((V).val[(OTHER)], alpha);             \
+  /* we use: v / 255 = (v + 1 + (v >> 8)) >> 8 */                      \
+  const uint16x8_t r2 = vsraq_n_u16(r1, r1, 8);                        \
+  const uint16x8_t g2 = vsraq_n_u16(g1, g1, 8);                        \
+  const uint16x8_t b2 = vsraq_n_u16(b1, b1, 8);                        \
+  const uint16x8_t r3 = vaddq_u16(r2, kOne);                           \
+  const uint16x8_t g3 = vaddq_u16(g2, kOne);                           \
+  const uint16x8_t b3 = vaddq_u16(b2, kOne);                           \
+  (V).val[1] = vshrn_n_u16(r3, 8);                                     \
+  (V).val[2] = vshrn_n_u16(g3, 8);                                     \
+  (V).val[(OTHER)] = vshrn_n_u16(b3, 8);                               \
+} while (0)
+
+static void ApplyAlphaMultiply_NEON(uint8_t* rgba, int alpha_first,
+                                    int w, int h, int stride) {
+  const uint16x8_t kOne = vdupq_n_u16(1u);
+  while (h-- > 0) {
+    uint32_t* const rgbx = (uint32_t*)rgba;
+    int i = 0;
+    if (alpha_first) {
+      for (; i + 8 <= w; i += 8) {
+        // load aaaa...|rrrr...|gggg...|bbbb...
+        uint8x8x4_t RGBX = vld4_u8((const uint8_t*)(rgbx + i));
+        MULTIPLY_BY_ALPHA(RGBX, 0, 3);
+        vst4_u8((uint8_t*)(rgbx + i), RGBX);
+      }
+    } else {
+      for (; i + 8 <= w; i += 8) {
+        uint8x8x4_t RGBX = vld4_u8((const uint8_t*)(rgbx + i));
+        MULTIPLY_BY_ALPHA(RGBX, 3, 0);
+        vst4_u8((uint8_t*)(rgbx + i), RGBX);
+      }
+    }
+    // Finish with left-overs.
+    for (; i < w; ++i) {
+      uint8_t* const rgb = rgba + (alpha_first ? 1 : 0);
+      const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3);
+      const uint32_t a = alpha[4 * i];
+      if (a != 0xff) {
+        const uint32_t mult = MULTIPLIER(a);
+        rgb[4 * i + 0] = PREMULTIPLY(rgb[4 * i + 0], mult);
+        rgb[4 * i + 1] = PREMULTIPLY(rgb[4 * i + 1], mult);
+        rgb[4 * i + 2] = PREMULTIPLY(rgb[4 * i + 2], mult);
+      }
+    }
+    rgba += stride;
+  }
+}
+#undef MULTIPLY_BY_ALPHA
+#undef MULTIPLIER
+#undef PREMULTIPLY
+
+//------------------------------------------------------------------------------
+
+static int DispatchAlpha_NEON(const uint8_t* alpha, int alpha_stride,
+                              int width, int height,
+                              uint8_t* dst, int dst_stride) {
+  uint32_t alpha_mask = 0xffffffffu;
+  uint8x8_t mask8 = vdup_n_u8(0xff);
+  uint32_t tmp[2];
+  int i, j;
+  for (j = 0; j < height; ++j) {
+    // We don't know if alpha is first or last in dst[] (depending on rgbA/Argb
+    // mode). So we must be sure dst[4*i + 8 - 1] is writable for the store.
+    // Hence the test with 'width - 1' instead of just 'width'.
+    for (i = 0; i + 8 <= width - 1; i += 8) {
+      uint8x8x4_t rgbX = vld4_u8((const uint8_t*)(dst + 4 * i));
+      const uint8x8_t alphas = vld1_u8(alpha + i);
+      rgbX.val[0] = alphas;
+      vst4_u8((uint8_t*)(dst + 4 * i), rgbX);
+      mask8 = vand_u8(mask8, alphas);
+    }
+    for (; i < width; ++i) {
+      const uint32_t alpha_value = alpha[i];
+      dst[4 * i] = alpha_value;
+      alpha_mask &= alpha_value;
+    }
+    alpha += alpha_stride;
+    dst += dst_stride;
+  }
+  vst1_u8((uint8_t*)tmp, mask8);
+  alpha_mask &= tmp[0];
+  alpha_mask &= tmp[1];
+  return (alpha_mask != 0xffffffffu);
+}
+
+static void DispatchAlphaToGreen_NEON(const uint8_t* alpha, int alpha_stride,
+                                      int width, int height,
+                                      uint32_t* dst, int dst_stride) {
+  int i, j;
+  uint8x8x4_t greens;   // leave A/R/B channels zero'd.
+  greens.val[0] = vdup_n_u8(0);
+  greens.val[2] = vdup_n_u8(0);
+  greens.val[3] = vdup_n_u8(0);
+  for (j = 0; j < height; ++j) {
+    for (i = 0; i + 8 <= width; i += 8) {
+      greens.val[1] = vld1_u8(alpha + i);
+      vst4_u8((uint8_t*)(dst + i), greens);
+    }
+    for (; i < width; ++i) dst[i] = alpha[i] << 8;
+    alpha += alpha_stride;
+    dst += dst_stride;
+  }
+}
+
+static int ExtractAlpha_NEON(const uint8_t* argb, int argb_stride,
+                             int width, int height,
+                             uint8_t* alpha, int alpha_stride) {
+  uint32_t alpha_mask = 0xffffffffu;
+  uint8x8_t mask8 = vdup_n_u8(0xff);
+  uint32_t tmp[2];
+  int i, j;
+  for (j = 0; j < height; ++j) {
+    // We don't know if alpha is first or last in dst[] (depending on rgbA/Argb
+    // mode). So we must be sure dst[4*i + 8 - 1] is writable for the store.
+    // Hence the test with 'width - 1' instead of just 'width'.
+    for (i = 0; i + 8 <= width - 1; i += 8) {
+      const uint8x8x4_t rgbX = vld4_u8((const uint8_t*)(argb + 4 * i));
+      const uint8x8_t alphas = rgbX.val[0];
+      vst1_u8((uint8_t*)(alpha + i), alphas);
+      mask8 = vand_u8(mask8, alphas);
+    }
+    for (; i < width; ++i) {
+      alpha[i] = argb[4 * i];
+      alpha_mask &= alpha[i];
+    }
+    argb += argb_stride;
+    alpha += alpha_stride;
+  }
+  vst1_u8((uint8_t*)tmp, mask8);
+  alpha_mask &= tmp[0];
+  alpha_mask &= tmp[1];
+  return (alpha_mask == 0xffffffffu);
+}
+
+static void ExtractGreen_NEON(const uint32_t* argb,
+                              uint8_t* alpha, int size) {
+  int i;
+  for (i = 0; i + 16 <= size; i += 16) {
+    const uint8x16x4_t rgbX = vld4q_u8((const uint8_t*)(argb + i));
+    const uint8x16_t greens = rgbX.val[1];
+    vst1q_u8(alpha + i, greens);
+  }
+  for (; i < size; ++i) alpha[i] = (argb[i] >> 8) & 0xff;
+}
+
+//------------------------------------------------------------------------------
+
+extern void WebPInitAlphaProcessingNEON(void);
+
+WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingNEON(void) {
+  WebPApplyAlphaMultiply = ApplyAlphaMultiply_NEON;
+  WebPDispatchAlpha = DispatchAlpha_NEON;
+  WebPDispatchAlphaToGreen = DispatchAlphaToGreen_NEON;
+  WebPExtractAlpha = ExtractAlpha_NEON;
+  WebPExtractGreen = ExtractGreen_NEON;
+}
+
+#else  // !WEBP_USE_NEON
+
+WEBP_DSP_INIT_STUB(WebPInitAlphaProcessingNEON)
+
+#endif  // WEBP_USE_NEON

src/dsp/alpha_processing_sse2.c

@@ -150,46 +150,46 @@ static int ExtractAlpha(const uint8_t* argb, int argb_stride,
 #define PREMULTIPLY(x, m) (((x) * (m)) >> 23)
 
 // We can't use a 'const int' for the SHUFFLE value, because it has to be an
-// immediate in the _mm_shufflexx_epi16() instruction. We really a macro here.
-#define APPLY_ALPHA(RGBX, SHUFFLE, MASK, MULT) do {             \
-  const __m128i argb0 = _mm_loadl_epi64((__m128i*)&(RGBX));     \
-  const __m128i argb1 = _mm_unpacklo_epi8(argb0, zero);         \
-  const __m128i alpha0 = _mm_and_si128(argb1, MASK);            \
-  const __m128i alpha1 = _mm_shufflelo_epi16(alpha0, SHUFFLE);  \
-  const __m128i alpha2 = _mm_shufflehi_epi16(alpha1, SHUFFLE);  \
-  /* alpha2 = [0 a0 a0 a0][0 a1 a1 a1] */                       \
-  const __m128i scale0 = _mm_mullo_epi16(alpha2, MULT);         \
-  const __m128i scale1 = _mm_mulhi_epu16(alpha2, MULT);         \
-  const __m128i argb2 = _mm_mulhi_epu16(argb1, scale0);         \
-  const __m128i argb3 = _mm_mullo_epi16(argb1, scale1);         \
-  const __m128i argb4 = _mm_adds_epu16(argb2, argb3);           \
-  const __m128i argb5 = _mm_srli_epi16(argb4, 7);               \
-  const __m128i argb6 = _mm_or_si128(argb5, alpha0);            \
-  const __m128i argb7 = _mm_packus_epi16(argb6, zero);          \
-  _mm_storel_epi64((__m128i*)&(RGBX), argb7);                   \
+// immediate in the _mm_shufflexx_epi16() instruction. We really need a macro.
+// We use: v / 255 = (v * 0x8081) >> 23, where v = alpha * {r,g,b} is a 16bit
+// value.
+#define APPLY_ALPHA(RGBX, SHUFFLE) do {                              \
+  const __m128i argb0 = _mm_loadu_si128((const __m128i*)&(RGBX));    \
+  const __m128i argb1_lo = _mm_unpacklo_epi8(argb0, zero);           \
+  const __m128i argb1_hi = _mm_unpackhi_epi8(argb0, zero);           \
+  const __m128i alpha0_lo = _mm_or_si128(argb1_lo, kMask);           \
+  const __m128i alpha0_hi = _mm_or_si128(argb1_hi, kMask);           \
+  const __m128i alpha1_lo = _mm_shufflelo_epi16(alpha0_lo, SHUFFLE); \
+  const __m128i alpha1_hi = _mm_shufflelo_epi16(alpha0_hi, SHUFFLE); \
+  const __m128i alpha2_lo = _mm_shufflehi_epi16(alpha1_lo, SHUFFLE); \
+  const __m128i alpha2_hi = _mm_shufflehi_epi16(alpha1_hi, SHUFFLE); \
+  /* alpha2 = [ff a0 a0 a0][ff a1 a1 a1] */                          \
+  const __m128i A0_lo = _mm_mullo_epi16(alpha2_lo, argb1_lo);        \
+  const __m128i A0_hi = _mm_mullo_epi16(alpha2_hi, argb1_hi);        \
+  const __m128i A1_lo = _mm_mulhi_epu16(A0_lo, kMult);               \
+  const __m128i A1_hi = _mm_mulhi_epu16(A0_hi, kMult);               \
+  const __m128i A2_lo = _mm_srli_epi16(A1_lo, 7);                    \
+  const __m128i A2_hi = _mm_srli_epi16(A1_hi, 7);                    \
+  const __m128i A3 = _mm_packus_epi16(A2_lo, A2_hi);                 \
+  _mm_storeu_si128((__m128i*)&(RGBX), A3);                           \
 } while (0)
 
-static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first,
-                               int w, int h, int stride) {
+static void ApplyAlphaMultiply_SSE2(uint8_t* rgba, int alpha_first,
+                                    int w, int h, int stride) {
   const __m128i zero = _mm_setzero_si128();
-  const int kSpan = 2;
-  const int w2 = w & ~(kSpan - 1);
+  const __m128i kMult = _mm_set1_epi16(0x8081u);
+  const __m128i kMask = _mm_set_epi16(0, 0xff, 0xff, 0, 0, 0xff, 0xff, 0);
+  const int kSpan = 4;
   while (h-- > 0) {
     uint32_t* const rgbx = (uint32_t*)rgba;
     int i;
     if (!alpha_first) {
-      const __m128i kMask = _mm_set_epi16(0xff, 0, 0, 0, 0xff, 0, 0, 0);
-      const __m128i kMult =
-          _mm_set_epi16(0, 0x8081, 0x8081, 0x8081, 0, 0x8081, 0x8081, 0x8081);
-      for (i = 0; i < w2; i += kSpan) {
-        APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(0, 3, 3, 3), kMask, kMult);
+      for (i = 0; i + kSpan <= w; i += kSpan) {
+        APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(2, 3, 3, 3));
       }
     } else {
-      const __m128i kMask = _mm_set_epi16(0, 0, 0, 0xff, 0, 0, 0, 0xff);
-      const __m128i kMult =
-          _mm_set_epi16(0x8081, 0x8081, 0x8081, 0, 0x8081, 0x8081, 0x8081, 0);
-      for (i = 0; i < w2; i += kSpan) {
-        APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(0, 0, 0, 3), kMask, kMult);
+      for (i = 0; i + kSpan <= w; i += kSpan) {
+        APPLY_ALPHA(rgbx[i], _MM_SHUFFLE(0, 0, 0, 1));
       }
     }
     // Finish with left-overs.
@@ -213,64 +213,51 @@ static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first,
 // -----------------------------------------------------------------------------
 // Apply alpha value to rows
 
-// We use: kINV255 = (1 << 24) / 255 = 0x010101
-// So: a * kINV255 = (a << 16) | [(a << 8) | a]
-// -> _mm_mulhi_epu16() takes care of the (a<<16) part,
-// and _mm_mullo_epu16(a * 0x0101,...) takes care of the "(a << 8) | a" one.
-
-static void MultARGBRow(uint32_t* const ptr, int width, int inverse) {
+static void MultARGBRow_SSE2(uint32_t* const ptr, int width, int inverse) {
   int x = 0;
   if (!inverse) {
     const int kSpan = 2;
     const __m128i zero = _mm_setzero_si128();
-    const __m128i kRound =
-        _mm_set_epi16(0, 1 << 7, 1 << 7, 1 << 7, 0, 1 << 7, 1 << 7, 1 << 7);
-    const __m128i kMult =
-        _mm_set_epi16(0, 0x0101, 0x0101, 0x0101, 0, 0x0101, 0x0101, 0x0101);
-    const __m128i kOne64 = _mm_set_epi16(1u << 8, 0, 0, 0, 1u << 8, 0, 0, 0);
-    const int w2 = width & ~(kSpan - 1);
-    for (x = 0; x < w2; x += kSpan) {
-      const __m128i argb0 = _mm_loadl_epi64((__m128i*)&ptr[x]);
-      const __m128i argb1 = _mm_unpacklo_epi8(argb0, zero);
-      const __m128i tmp0 = _mm_shufflelo_epi16(argb1, _MM_SHUFFLE(3, 3, 3, 3));
-      const __m128i tmp1 = _mm_shufflehi_epi16(tmp0, _MM_SHUFFLE(3, 3, 3, 3));
-      const __m128i tmp2 = _mm_srli_epi64(tmp1, 16);
-      const __m128i scale0 = _mm_mullo_epi16(tmp1, kMult);
-      const __m128i scale1 = _mm_or_si128(tmp2, kOne64);
-      const __m128i argb2 = _mm_mulhi_epu16(argb1, scale0);
-      const __m128i argb3 = _mm_mullo_epi16(argb1, scale1);
-      const __m128i argb4 = _mm_adds_epu16(argb2, argb3);
-      const __m128i argb5 = _mm_adds_epu16(argb4, kRound);
-      const __m128i argb6 = _mm_srli_epi16(argb5, 8);
-      const __m128i argb7 = _mm_packus_epi16(argb6, zero);
-      _mm_storel_epi64((__m128i*)&ptr[x], argb7);
+    const __m128i k128 = _mm_set1_epi16(128);
+    const __m128i kMult = _mm_set1_epi16(0x0101);
+    const __m128i kMask = _mm_set_epi16(0, 0xff, 0, 0, 0, 0xff, 0, 0);
+    for (x = 0; x + kSpan <= width; x += kSpan) {
+      // To compute 'result = (int)(a * x / 255. + .5)', we use:
+      //   tmp = a * v + 128, result = (tmp * 0x0101u) >> 16
+      const __m128i A0 = _mm_loadl_epi64((const __m128i*)&ptr[x]);
+      const __m128i A1 = _mm_unpacklo_epi8(A0, zero);
+      const __m128i A2 = _mm_or_si128(A1, kMask);
+      const __m128i A3 = _mm_shufflelo_epi16(A2, _MM_SHUFFLE(2, 3, 3, 3));
+      const __m128i A4 = _mm_shufflehi_epi16(A3, _MM_SHUFFLE(2, 3, 3, 3));
+      // here, A4 = [ff a0 a0 a0][ff a1 a1 a1]
+      const __m128i A5 = _mm_mullo_epi16(A4, A1);
+      const __m128i A6 = _mm_add_epi16(A5, k128);
+      const __m128i A7 = _mm_mulhi_epu16(A6, kMult);
+      const __m128i A10 = _mm_packus_epi16(A7, zero);
+      _mm_storel_epi64((__m128i*)&ptr[x], A10);
     }
   }
   width -= x;
   if (width > 0) WebPMultARGBRowC(ptr + x, width, inverse);
 }
 
-static void MultRow(uint8_t* const ptr, const uint8_t* const alpha,
-                    int width, int inverse) {
+static void MultRow_SSE2(uint8_t* const ptr, const uint8_t* const alpha,
+                         int width, int inverse) {
   int x = 0;
   if (!inverse) {
-    const int kSpan = 8;
     const __m128i zero = _mm_setzero_si128();
-    const __m128i kRound = _mm_set1_epi16(1 << 7);
-    const int w2 = width & ~(kSpan - 1);
-    for (x = 0; x < w2; x += kSpan) {
+    const __m128i k128 = _mm_set1_epi16(128);
+    const __m128i kMult = _mm_set1_epi16(0x0101);
+    for (x = 0; x + 8 <= width; x += 8) {
       const __m128i v0 = _mm_loadl_epi64((__m128i*)&ptr[x]);
+      const __m128i a0 = _mm_loadl_epi64((const __m128i*)&alpha[x]);
       const __m128i v1 = _mm_unpacklo_epi8(v0, zero);
-      const __m128i alpha0 = _mm_loadl_epi64((const __m128i*)&alpha[x]);
-      const __m128i alpha1 = _mm_unpacklo_epi8(alpha0, zero);
-      const __m128i alpha2 = _mm_unpacklo_epi8(alpha0, alpha0);
-      const __m128i v2 = _mm_mulhi_epu16(v1, alpha2);
-      const __m128i v3 = _mm_mullo_epi16(v1, alpha1);
-      const __m128i v4 = _mm_adds_epu16(v2, v3);
-      const __m128i v5 = _mm_adds_epu16(v4, kRound);
-      const __m128i v6 = _mm_srli_epi16(v5, 8);
-      const __m128i v7 = _mm_packus_epi16(v6, zero);
-      _mm_storel_epi64((__m128i*)&ptr[x], v7);
+      const __m128i a1 = _mm_unpacklo_epi8(a0, zero);
+      const __m128i v2 = _mm_mullo_epi16(v1, a1);
+      const __m128i v3 = _mm_add_epi16(v2, k128);
+      const __m128i v4 = _mm_mulhi_epu16(v3, kMult);
+      const __m128i v5 = _mm_packus_epi16(v4, zero);
+      _mm_storel_epi64((__m128i*)&ptr[x], v5);
     }
   }
   width -= x;
@@ -283,9 +270,9 @@ static void MultRow(uint8_t* const ptr, const uint8_t* const alpha,
 extern void WebPInitAlphaProcessingSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPInitAlphaProcessingSSE2(void) {
-  WebPMultARGBRow = MultARGBRow;
-  WebPMultRow = MultRow;
-  WebPApplyAlphaMultiply = ApplyAlphaMultiply;
+  WebPMultARGBRow = MultARGBRow_SSE2;
+  WebPMultRow = MultRow_SSE2;
+  WebPApplyAlphaMultiply = ApplyAlphaMultiply_SSE2;
   WebPDispatchAlpha = DispatchAlpha;
   WebPDispatchAlphaToGreen = DispatchAlphaToGreen;
   WebPExtractAlpha = ExtractAlpha;

src/dsp/argb_sse2.c

@@ -12,6 +12,7 @@
 // Author: Skal (pascal.massimino@gmail.com)
 
 #include "./dsp.h"
+#include "./lossless.h"
 
 #if defined(WEBP_USE_SSE2)
 
@@ -19,30 +20,13 @@
 #include <emmintrin.h>
 #include <string.h>
 
-static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) {
-  return (((uint32_t)a << 24) | (r << 16) | (g << 8) | b);
-}
-
 static void PackARGB(const uint8_t* a, const uint8_t* r, const uint8_t* g,
                      const uint8_t* b, int len, uint32_t* out) {
+  (void)a;
   if (g == r + 1) {  // RGBA input order. Need to swap R and B.
-    int i = 0;
-    const int len_max = len & ~3;  // max length processed in main loop
-    const __m128i red_blue_mask = _mm_set1_epi32(0x00ff00ffu);
     assert(b == r + 2);
     assert(a == r + 3);
-    for (; i < len_max; i += 4) {
-      const __m128i A = _mm_loadu_si128((const __m128i*)(r + 4 * i));
-      const __m128i B = _mm_and_si128(A, red_blue_mask);     // R 0 B 0
-      const __m128i C = _mm_andnot_si128(red_blue_mask, A);  // 0 G 0 A
-      const __m128i D = _mm_shufflelo_epi16(B, _MM_SHUFFLE(2, 3, 0, 1));
-      const __m128i E = _mm_shufflehi_epi16(D, _MM_SHUFFLE(2, 3, 0, 1));
-      const __m128i F = _mm_or_si128(E, C);
-      _mm_storeu_si128((__m128i*)(out + i), F);
-    }
-    for (; i < len; ++i) {
-      out[i] = MakeARGB32(a[4 * i], r[4 * i], g[4 * i], b[4 * i]);
-    }
+    VP8LConvertBGRAToRGBA((const uint32_t*)r, len, (uint8_t*)out);
   } else {
     assert(g == b + 1);
     assert(r == b + 2);
@@ -55,8 +39,10 @@ static void PackARGB(const uint8_t* a, const uint8_t* r, const uint8_t* g,
 // Entry point
 
 extern void VP8EncDspARGBInitSSE2(void);
+extern void VP8LDspInitSSE2(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspARGBInitSSE2(void) {
+  VP8LDspInitSSE2();
   VP8PackARGB = PackARGB;
 }
 

src/dsp/common_sse2.h

@@ -100,6 +100,91 @@ static WEBP_INLINE void VP8Transpose_2_4x4_16b(
   // a03 a13 a23 a33   b03 b13 b23 b33
 }
 
+//------------------------------------------------------------------------------
+// Channel mixing.
+
+// Function used several times in VP8PlanarTo24b.
+// It samples the in buffer as follows: one every two unsigned char is stored
+// at the beginning of the buffer, while the other half is stored at the end.
+#define VP8PlanarTo24bHelper(IN, OUT)                            \
+  do {                                                           \
+    const __m128i v_mask = _mm_set1_epi16(0x00ff);               \
+    /* Take one every two upper 8b values.*/                     \
+    (OUT##0) = _mm_packus_epi16(_mm_and_si128((IN##0), v_mask),  \
+                                _mm_and_si128((IN##1), v_mask)); \
+    (OUT##1) = _mm_packus_epi16(_mm_and_si128((IN##2), v_mask),  \
+                                _mm_and_si128((IN##3), v_mask)); \
+    (OUT##2) = _mm_packus_epi16(_mm_and_si128((IN##4), v_mask),  \
+                                _mm_and_si128((IN##5), v_mask)); \
+    /* Take one every two lower 8b values.*/                     \
+    (OUT##3) = _mm_packus_epi16(_mm_srli_epi16((IN##0), 8),      \
+                                _mm_srli_epi16((IN##1), 8));     \
+    (OUT##4) = _mm_packus_epi16(_mm_srli_epi16((IN##2), 8),      \
+                                _mm_srli_epi16((IN##3), 8));     \
+    (OUT##5) = _mm_packus_epi16(_mm_srli_epi16((IN##4), 8),      \
+                                _mm_srli_epi16((IN##5), 8));     \
+  } while (0)
+
+// Pack the planar buffers
+// rrrr... rrrr... gggg... gggg... bbbb... bbbb....
+// triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ...
+static WEBP_INLINE void VP8PlanarTo24b(__m128i* const in0, __m128i* const in1,
+                                       __m128i* const in2, __m128i* const in3,
+                                       __m128i* const in4, __m128i* const in5) {
+  // The input is 6 registers of sixteen 8b but for the sake of explanation,
+  // let's take 6 registers of four 8b values.
+  // To pack, we will keep taking one every two 8b integer and move it
+  // around as follows:
+  // Input:
+  //   r0r1r2r3 | r4r5r6r7 | g0g1g2g3 | g4g5g6g7 | b0b1b2b3 | b4b5b6b7
+  // Split the 6 registers in two sets of 3 registers: the first set as the even
+  // 8b bytes, the second the odd ones:
+  //   r0r2r4r6 | g0g2g4g6 | b0b2b4b6 | r1r3r5r7 | g1g3g5g7 | b1b3b5b7
+  // Repeat the same permutations twice more:
+  //   r0r4g0g4 | b0b4r1r5 | g1g5b1b5 | r2r6g2g6 | b2b6r3r7 | g3g7b3b7
+  //   r0g0b0r1 | g1b1r2g2 | b2r3g3b3 | r4g4b4r5 | g5b5r6g6 | b6r7g7b7
+  __m128i tmp0, tmp1, tmp2, tmp3, tmp4, tmp5;
+  VP8PlanarTo24bHelper(*in, tmp);
+  VP8PlanarTo24bHelper(tmp, *in);
+  VP8PlanarTo24bHelper(*in, tmp);
+  // We need to do it two more times than the example as we have sixteen bytes.
+  {
+    __m128i out0, out1, out2, out3, out4, out5;
+    VP8PlanarTo24bHelper(tmp, out);
+    VP8PlanarTo24bHelper(out, *in);
+  }
+}
+
+#undef VP8PlanarTo24bHelper
+
+// Convert four packed four-channel buffers like argbargbargbargb... into the
+// split channels aaaaa ... rrrr ... gggg .... bbbbb ......
+static WEBP_INLINE void VP8L32bToPlanar(__m128i* const in0,
+                                        __m128i* const in1,
+                                        __m128i* const in2,
+                                        __m128i* const in3) {
+  // Column-wise transpose.
+  const __m128i A0 = _mm_unpacklo_epi8(*in0, *in1);
+  const __m128i A1 = _mm_unpackhi_epi8(*in0, *in1);
+  const __m128i A2 = _mm_unpacklo_epi8(*in2, *in3);
+  const __m128i A3 = _mm_unpackhi_epi8(*in2, *in3);
+  const __m128i B0 = _mm_unpacklo_epi8(A0, A1);
+  const __m128i B1 = _mm_unpackhi_epi8(A0, A1);
+  const __m128i B2 = _mm_unpacklo_epi8(A2, A3);
+  const __m128i B3 = _mm_unpackhi_epi8(A2, A3);
+  // C0 = g7 g6 ... g1 g0 | b7 b6 ... b1 b0
+  // C1 = a7 a6 ... a1 a0 | r7 r6 ... r1 r0
+  const __m128i C0 = _mm_unpacklo_epi8(B0, B1);
+  const __m128i C1 = _mm_unpackhi_epi8(B0, B1);
+  const __m128i C2 = _mm_unpacklo_epi8(B2, B3);
+  const __m128i C3 = _mm_unpackhi_epi8(B2, B3);
+  // Gather the channels.
+  *in0 = _mm_unpackhi_epi64(C1, C3);
+  *in1 = _mm_unpacklo_epi64(C1, C3);
+  *in2 = _mm_unpackhi_epi64(C0, C2);
+  *in3 = _mm_unpacklo_epi64(C0, C2);
+}
+
 #endif  // WEBP_USE_SSE2
 
 #ifdef __cplusplus