From 6f76d246ba2940607db013ef5bea95346c25d18d Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Sun, 1 Jul 2012 17:55:21 -0700
Subject: [PATCH] cwebp: add basic TIFF support

Change-Id: I29f354e1ef9cf8f23002cf2e15814a53a94b4ed5
---
 examples/cwebp.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++
 makefile.unix    |  6 ++--
 2 files changed, 76 insertions(+), 2 deletions(-)

diff --git a/examples/cwebp.c b/examples/cwebp.c
index 7e7e4b53..35140ee5 100644
--- a/examples/cwebp.c
+++ b/examples/cwebp.c
@@ -27,6 +27,10 @@
 #include <jpeglib.h>
 #endif
 
+#ifdef WEBP_HAVE_TIFF
+#include <tiffio.h>
+#endif
+
 #ifdef HAVE_WINCODEC_H
 #ifdef __MINGW32__
 #define INITGUID  // Without this GUIDs are declared extern and fail to link
@@ -449,9 +453,73 @@ static int ReadPNG(FILE* in_file, WebPPicture* const pic, int keep_alpha) {
 }
 #endif
 
+#ifdef WEBP_HAVE_TIFF
+static int ReadTIFF(const char* const filename,
+                    WebPPicture* const pic, int keep_alpha) {
+  TIFF* const tif = TIFFOpen(filename, "r");
+  uint32 width, height;
+  uint32* raster;
+  int ok = 0;
+  int dircount = 1;
+
+  if (tif == NULL) {
+    fprintf(stderr, "Error! Cannot open TIFF file '%s'\n", filename);
+    return 0;
+  }
+
+  while (TIFFReadDirectory(tif)) ++dircount;
+
+  if (dircount > 1) {
+    fprintf(stderr, "Warning: multi-directory TIFF files are not supported.\n"
+                    "Only the first will be used, %d will be ignored.\n",
+                    dircount - 1);
+  }
+
+  TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width);
+  TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height);
+  raster = (uint32*)_TIFFmalloc(width * height * sizeof(*raster));
+  if (raster != NULL) {
+    if (TIFFReadRGBAImageOriented(tif, width, height, raster,
+                                  ORIENTATION_TOPLEFT, 1)) {
+      const int stride = width * sizeof(*raster);
+      pic->width = width;
+      pic->height = height;
+      // TIFF data is ABGR
+#ifdef __BIG_ENDIAN__
+      TIFFSwabArrayOfLong(raster, width * height);
+#endif
+      ok = keep_alpha
+         ? WebPPictureImportRGBA(pic, (const uint8_t*)raster, stride)
+         : WebPPictureImportRGBX(pic, (const uint8_t*)raster, stride);
+    }
+    _TIFFfree(raster);
+  } else {
+    fprintf(stderr, "Error allocating TIFF RGBA memory!\n");
+  }
+
+  if (ok && keep_alpha == 2) {
+    WebPCleanupTransparentArea(pic);
+  }
+
+  TIFFClose(tif);
+  return ok;
+}
+#else
+static int ReadTIFF(const char* const filename,
+                    WebPPicture* const pic, int keep_alpha) {
+  (void)filename;
+  (void)pic;
+  (void)keep_alpha;
+  fprintf(stderr, "TIFF support not compiled. Please install the libtiff "
+          "development package before building.\n");
+  return 0;
+}
+#endif
+
 typedef enum {
   PNG = 0,
   JPEG,
+  TIFF_,  // 'TIFF' clashes with libtiff
   UNSUPPORTED
 } InputFileFormat;
 
@@ -470,6 +538,8 @@ static InputFileFormat GetImageType(FILE* in_file) {
     format = PNG;
   } else if (magic >= 0xFFD8FF00U && magic <= 0xFFD8FFFFU) {
     format = JPEG;
+  } else if (magic == 0x49492A00 || magic == 0x4D4D002A) {
+    format = TIFF_;
   }
   return format;
 }
@@ -490,6 +560,8 @@ static int ReadPicture(const char* const filename, WebPPicture* const pic,
       ok = ReadPNG(in_file, pic, keep_alpha);
     } else if (format == JPEG) {
       ok = ReadJPEG(in_file, pic);
+    } else if (format == TIFF_) {
+      ok = ReadTIFF(filename, pic, keep_alpha);
     }
   } else {
     // If image size is specified, infer it as YUV format.
diff --git a/makefile.unix b/makefile.unix
index 909ae436..3c109ac9 100644
--- a/makefile.unix
+++ b/makefile.unix
@@ -12,8 +12,8 @@
 
 # These flag assume you have libpng and libjpeg installed. If not, either
 # follow below install instructions or just comment out the next lines.
-EXTRA_FLAGS= -DWEBP_HAVE_PNG -DWEBP_HAVE_JPEG
-EXTRA_LIBS= -lpng -ljpeg -lz
+EXTRA_FLAGS= -DWEBP_HAVE_PNG -DWEBP_HAVE_JPEG -DWEBP_HAVE_TIFF
+EXTRA_LIBS= -lpng -ltiff -ljpeg -lz
 ifeq ($(strip $(shell uname)), Darwin)
   # Work around a problem linking tables marked as common symbols,
   # cf., src/enc/yuv.[hc]
@@ -30,10 +30,12 @@ endif
 # 1. Install MacPorts (http://www.macports.org/install.php)
 # 2. Run "sudo port install jpeg"
 # 3. Run "sudo port install libpng"
+# 4. Run "sudo port install tiff"
 
 # To install libraries on Linux:
 # 1. Run "sudo apt-get install libjpeg62-dev"
 # 2. Run "sudo apt-get install libpng12-dev"
+# 3. Run "sudo apt-get install libtiff4-dev"
 
 # Uncomment for build for 32bit platform
 # Alternatively, you can just use the command