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collect all decoding utilities from examples/ in libexampledec.a

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adds a generic examples/image_dec.[ch] entry point too.

WebPGuessImageType() can be used to infer image type.

Change-Id: I8337e7b6ad91863c9cf118e4791668d2d175079b
This commit is contained in:
Pascal Massimino
2016-05-30 21:45:38 -07:00
parent 0b8ae8520f
commit ae2a7222ce
9 changed files with 180 additions and 79 deletions
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28
examples/Android.mk
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@ -15,6 +15,27 @@ 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
@ -24,15 +45,10 @@ include $(CLEAR_VARS)
# minor modification to their Android.mk files.
LOCAL_SRC_FILES := \
cwebp.c \
jpegdec.c \
metadata.c \
pngdec.c \
tiffdec.c \
webpdec.c \
LOCAL_CFLAGS := $(WEBP_CFLAGS)
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../src
LOCAL_STATIC_LIBRARIES := example_util webp
LOCAL_STATIC_LIBRARIES := example_util example_dec webp
LOCAL_MODULE := cwebp

22
examples/Makefile.am
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@ -12,10 +12,20 @@ if BUILD_GIF2WEBP
bin_PROGRAMS += gif2webp
endif
noinst_LTLIBRARIES = libexampleutil.la
noinst_LTLIBRARIES = libexampleutil.la libexampledec.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
@ -31,15 +41,9 @@ 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 metadata.c metadata.h stopwatch.h
cwebp_SOURCES += jpegdec.c jpegdec.h
cwebp_SOURCES += pngdec.c pngdec.h
cwebp_SOURCES += tiffdec.c tiffdec.h
cwebp_SOURCES += webpdec.c webpdec.h
cwebp_SOURCES += wicdec.c wicdec.h
cwebp_SOURCES = cwebp.c stopwatch.h
cwebp_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
cwebp_CPPFLAGS += $(JPEG_INCLUDES) $(PNG_INCLUDES) $(TIFF_INCLUDES)
cwebp_LDADD = libexampleutil.la ../src/libwebp.la
cwebp_LDADD = libexampleutil.la libexampledec.la ../src/libwebp.la
cwebp_LDADD += $(JPEG_LIBS) $(PNG_LIBS) $(TIFF_LIBS)
gif2webp_SOURCES = gif2webp.c gifdec.c gifdec.h

49
examples/cwebp.c
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@ -20,17 +20,10 @@
#include "webp/config.h"
#endif
#include "webp/encode.h"
#include "./example_util.h"
#include "./metadata.h"
#include "./image_dec.h"
#include "./stopwatch.h"
#include "./jpegdec.h"
#include "./pngdec.h"
#include "./tiffdec.h"
#include "./webpdec.h"
#include "./wicdec.h"
#include "webp/encode.h"
#ifndef WEBP_DLL
#ifdef __cplusplus
@ -102,34 +95,6 @@ static int ReadPicture(const char* const filename, WebPPicture* const pic,
#else // !HAVE_WINCODEC_H
typedef enum {
PNG_ = 0,
JPEG_,
TIFF_, // 'TIFF' clashes with libtiff
WEBP_,
UNSUPPORTED
} InputFileFormat;
static uint32_t GetBE32(const uint8_t buf[]) {
return ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
}
static InputFileFormat GuessImageType(const uint8_t buf[12]) {
InputFileFormat format = UNSUPPORTED;
const uint32_t magic1 = GetBE32(buf + 0);
const uint32_t magic2 = GetBE32(buf + 8);
if (magic1 == 0x89504E47U) {
format = PNG_;
} else if (magic1 >= 0xFFD8FF00U && magic1 <= 0xFFD8FFFFU) {
format = JPEG_;
} else if (magic1 == 0x49492A00 || magic1 == 0x4D4D002A) {
format = TIFF_;
} else if (magic1 == 0x52494646 && magic2 == 0x57454250) {
format = WEBP_;
}
return format;
}
static int ReadPicture(const char* const filename, WebPPicture* const pic,
int keep_alpha, Metadata* const metadata) {
const uint8_t* data = NULL;
@ -142,14 +107,14 @@ static int ReadPicture(const char* const filename, WebPPicture* const pic,
if (pic->width == 0 || pic->height == 0) {
ok = 0;
if (data_size >= 12) {
const InputFileFormat format = GuessImageType(data);
if (format == PNG_) {
const WebPInputFileFormat format = WebPGuessImageType(data, data_size);
if (format == WEBP_PNG_FORMAT) {
ok = ReadPNG(data, data_size, pic, keep_alpha, metadata);
} else if (format == JPEG_) {
} else if (format == WEBP_JPEG_FORMAT) {
ok = ReadJPEG(data, data_size, pic, metadata);
} else if (format == TIFF_) {
} else if (format == WEBP_TIFF_FORMAT) {
ok = ReadTIFF(data, data_size, pic, keep_alpha, metadata);
} else if (format == WEBP_) {
} else if (format == WEBP_WEBP_FORMAT) {
ok = ReadWebP(data, data_size, pic, keep_alpha, metadata);
}
}

35
examples/image_dec.c Normal file
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@ -0,0 +1,35 @@
// 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.
// -----------------------------------------------------------------------------
//
// Generic image-type guessing.
#include "./image_dec.h"
static WEBP_INLINE uint32_t GetBE32(const uint8_t buf[]) {
return ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
}
WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
size_t data_size) {
WebPInputFileFormat format = WEBP_UNSUPPORTED_FORMAT;
if (data != NULL && data_size >= 12) {
const uint32_t magic1 = GetBE32(data + 0);
const uint32_t magic2 = GetBE32(data + 8);
if (magic1 == 0x89504E47U) {
format = WEBP_PNG_FORMAT;
} else if (magic1 >= 0xFFD8FF00U && magic1 <= 0xFFD8FFFFU) {
format = WEBP_JPEG_FORMAT;
} else if (magic1 == 0x49492A00 || magic1 == 0x4D4D002A) {
format = WEBP_TIFF_FORMAT;
} else if (magic1 == 0x52494646 && magic2 == 0x57454250) {
format = WEBP_WEBP_FORMAT;
}
}
return format;
}

51
examples/image_dec.h Normal file
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@ -0,0 +1,51 @@
// 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 decode PNG/JPEG/WebP/TIFF/WIC input images.
//
// Author: Skal (pascal.massimino@gmail.com)
#ifndef WEBP_EXAMPLES_IMAGE_DEC_H_
#define WEBP_EXAMPLES_IMAGE_DEC_H_
#include "webp/types.h"
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#include "./metadata.h"
#include "./jpegdec.h"
#include "./pngdec.h"
#include "./tiffdec.h"
#include "./webpdec.h"
#include "./wicdec.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef enum {
WEBP_PNG_FORMAT = 0,
WEBP_JPEG_FORMAT,
WEBP_TIFF_FORMAT,
WEBP_WEBP_FORMAT,
WEBP_UNSUPPORTED_FORMAT
} WebPInputFileFormat;
// Try to infer the image format. 'data_size' should be larger than 12.
// Returns WEBP_UNSUPPORTED_FORMAT if format can't be guess safely.
WebPInputFileFormat WebPGuessImageType(const uint8_t* const data,
size_t data_size);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WEBP_EXAMPLES_IMAGE_DEC_H_