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better gif delay decode

This commit is contained in:
John Cupitt 2017-11-21 15:09:44 +00:00
parent d0c7f9d040
commit b611f46d5a
1 changed files with 10 additions and 7 deletions
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17
libvips/foreign/gifload.c
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@ -15,6 +15,8 @@
* - support @n, page-height
* 5/10/17
* - colormap can be missing thanks Kleis
* 21/11/17
* - add "gif-delay" metadata
*/
/*
@ -117,7 +119,8 @@ typedef struct _VipsForeignLoadGif {
gboolean has_transparency;
gboolean has_colour;
/* Delay in ms. We only track a single delay value for the whole file.
/* Delay in 1/100ths of a second. We only track a single delay
* value for the whole file.
*/
int delay;
@ -550,16 +553,16 @@ vips_foreign_load_gif_page( VipsForeignLoadGif *gif, VipsImage *out )
}
if( ext_code == GRAPHICS_EXT_FUNC_CODE &&
extension &&
extension[0] == 4 &&
(extension[1] & 0x1) ) {
/* Bytes are 4, 1, delay low, delay high,
extension ) {
/* Bytes are flags, delay low, delay high,
* transparency. Bit 1 means transparency
* is being set.
*/
if( extension[1] & 0x1 ) {
gif->transparency = extension[4];
gif->has_transparency = TRUE;
}
gif->delay = extension[2] | (extension[3] << 8);
gif->transparency = extension[4];
gif->has_transparency = TRUE;
VIPS_DEBUG_MSG( "gifload: "
"seen transparency %d\n",