dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-13 06:24:27 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

gif2webp: handle 1-frame case properly + fix anim_diff

Browse Source 
follow-up to commit b4e046778

Change-Id: I3c7617d09682262ca7929e6a3e56777b163cce45
This commit is contained in:
Pascal Massimino
2017-09-20 14:08:31 -07:00
parent c7f295d30c
commit 3c74c645ca
2 changed files with 22 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
examples/anim_util.c
View File

@ -425,6 +425,11 @@ static uint32_t GetBackgroundColorGIF(GifFileType* gif) {
}
// Find appropriate app extension and get loop count from the next extension.
// We use Chrome's interpretation of the 'loop_count' semantics:
// if not present -> loop once
// if present and loop_count == 0, return 0 ('infinite').
// if present and loop_count != 0, it's the number of *extra* loops
// so we need to return loop_count + 1 as total loop number.
static uint32_t GetLoopCountGIF(const GifFileType* const gif) {
int i;
for (i = 0; i < gif->ImageCount; ++i) {
@ -442,12 +447,13 @@ static uint32_t GetLoopCountGIF(const GifFileType* const gif) {
if (signature_is_ok &&
eb2->Function == CONTINUE_EXT_FUNC_CODE && eb2->ByteCount >= 3 &&
eb2->Bytes[0] == 1) {
return ((uint32_t)(eb2->Bytes[2]) << 8) +
((uint32_t)(eb2->Bytes[1]) << 0);
const uint32_t extra_loop = ((uint32_t)(eb2->Bytes[2]) << 8) +
((uint32_t)(eb2->Bytes[1]) << 0);
return (extra_loop > 0) ? extra_loop + 1 : 0;
}
}
}
return 0; // Default.
return 1; // Default.
}
// Get duration of 'n'th frame in milliseconds.