From abfc26f5cde53d1664f03ff49358ae9cc9037556 Mon Sep 17 00:00:00 2001
From: Pavel Charvat <pavel.charvat@netcentrum.cz>
Date: Mon, 31 Jul 2006 13:13:08 +0200
Subject: [PATCH] disabling GIF transparency... I probably do not understand
 GIF specification, because SBackGroundColor == 0 insted of 255 (real
 transparent color index) in one tested GIF

---
 images/io-libungif.c | 14 ++++++++++++--
 images/io-main.c     |  2 +-
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/images/io-libungif.c b/images/io-libungif.c
index a35b6d83..a3bfc397 100644
--- a/images/io-libungif.c
+++ b/images/io-libungif.c
@@ -45,6 +45,7 @@ libungif_read_header(struct image_io *io)
       return 0;
     }
 
+  DBG("executing DGifSlurp()");
   if (unlikely(DGifSlurp(gif) != GIF_OK))
     {
       image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "Gif read failed.");
@@ -52,6 +53,7 @@ libungif_read_header(struct image_io *io)
       return 0;
     }
 
+  DBG("ImageCount=%d ColorResolution=%d SBackGroundColor=%d SColorMap=%p", gif->ImageCount, gif->SColorResolution, gif->SBackGroundColor, gif->SColorMap);
   if (unlikely(!gif->ImageCount))
     {
       image_thread_err(io->thread, IMAGE_ERR_READ_FAILED, "There are no images in gif file.");
@@ -84,12 +86,15 @@ libungif_read_header(struct image_io *io)
       return 0;
     }
   io->flags = COLOR_SPACE_RGB | IMAGE_IO_HAS_PALETTE;
-  if ((uns)gif->SBackGroundColor < (uns)color_map->ColorCount)
+  /* FIXME transparent GIFs disabled */
+#if 0
+  if (gif->SColorMap && !image->ImageDesc.ColorMap && (uns)gif->SBackGroundColor < (uns)color_map->ColorCount)
     {
       io->flags |= IMAGE_ALPHA | IMAGE_IO_HAS_BACKGROUND;
       GifColorType *background = color_map->Colors + gif->SBackGroundColor;
       color_make_rgb(&io->background_color, background->Red, background->Green, background->Blue);
     }
+#endif
 
   /* Success */
   io->read_cancel = libungif_read_cancel;
@@ -116,7 +121,12 @@ libungif_read_data(struct image_io *io)
   byte *pixels = (byte *)image->RasterBits;
   ColorMapObject *color_map = image->ImageDesc.ColorMap ? : gif->SColorMap;
   GifColorType *palette = color_map->Colors;
-  uns background = gif->SBackGroundColor;
+  uns background = (
+  /* FIXME: transparent GIFs disabled */
+#if 1
+    0 &&
+#endif
+    gif->SColorMap && !image->ImageDesc.ColorMap) ? gif->SBackGroundColor : 256;
   byte *img_end = rdi.image->pixels + rdi.image->image_size;
 
   /* Handle deinterlacing */
diff --git a/images/io-main.c b/images/io-main.c
index 9442c7e0..15e76fbb 100644
--- a/images/io-main.c
+++ b/images/io-main.c
@@ -7,7 +7,7 @@
  *	of the GNU Lesser General Public License.
  */
 
-#define LOCAL_DEBUG
+#undef LOCAL_DEBUG
 
 #include "lib/lib.h"
 #include "images/images.h"
-- 
2.39.2