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demux: keep a frame tail pointer; used in AddFrame

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this speeds up the parse of a file with a large number of frames.

Change-Id: Ibc61324eb50a04438f811a6f7787d378d763c104
This commit is contained in:
James Zern
2013-03-25 23:33:38 -07:00
parent db46daab97
commit 6f18f12f99
1 changed files with 6 additions and 7 deletions
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13
src/demux/demux.c
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@@ -69,6 +69,7 @@ struct WebPDemuxer {
uint32_t bgcolor_;
int num_frames_;
Frame* frames_;
Frame** frames_tail_;
Chunk* chunks_; // non-image chunks
};
@@ -183,15 +184,12 @@ static void AddChunk(WebPDemuxer* const dmux, Chunk* const chunk) {
// Add a frame to the end of the list, ensuring the last frame is complete.
// Returns true on success, false otherwise.
static int AddFrame(WebPDemuxer* const dmux, Frame* const frame) {
const Frame* last_frame = NULL;
Frame** f = &dmux->frames_;
while (*f != NULL) {
last_frame = *f;
f = &(*f)->next_;
}
const Frame* const last_frame = *dmux->frames_tail_;
if (last_frame != NULL && !last_frame->complete_) return 0;
*f = frame;
*dmux->frames_tail_ = frame;
frame->next_ = NULL;
dmux->frames_tail_ = &frame->next_;
return 1;
}
@@ -660,6 +658,7 @@ static void InitDemux(WebPDemuxer* const dmux, const MemBuffer* const mem) {
dmux->bgcolor_ = 0xFFFFFFFF; // White background by default.
dmux->canvas_width_ = -1;
dmux->canvas_height_ = -1;
dmux->frames_tail_ = &dmux->frames_;
dmux->mem_ = *mem;
}