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AnimEncoder lib cleanup: prev to prev canvas not needed.

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Given that we decided to only handle frame disposal for output WebP
internally,
only current and previous canvas need to be maintained.

Change-Id: I625293bed5aeb5aabf4eca779f6ec3ee84c9ff2a
This commit is contained in:
Urvang Joshi 2015-01-06 16:22:29 -08:00
parent 4b997ae46d
commit ae1c046e12
1 changed files with 2 additions and 8 deletions
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10
src/mux/anim_encode.c
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@ -46,7 +46,6 @@ struct WebPAnimEncoder {
WebPPicture curr_canvas_mod_; // Possibly modified current canvas.
WebPPicture prev_canvas_; // Previous canvas.
WebPPicture prev_canvas_disposed_; // Previous canvas disposed to background.
WebPPicture prev_to_prev_canvas_; // Previous to previous canvas.
// Encoded data.
EncodedFrame* encoded_frames_; // Array of encoded frames.
@ -204,8 +203,7 @@ WebPAnimEncoder* WebPAnimEncoderNewInternal(
// Canvas buffers.
if (!WebPPictureInit(&enc->curr_canvas_mod_) ||
!WebPPictureInit(&enc->prev_canvas_) ||
!WebPPictureInit(&enc->prev_canvas_disposed_) ||
!WebPPictureInit(&enc->prev_to_prev_canvas_)) {
!WebPPictureInit(&enc->prev_canvas_disposed_)) {
return NULL;
}
enc->curr_canvas_mod_.width = width;
@ -213,12 +211,10 @@ WebPAnimEncoder* WebPAnimEncoderNewInternal(
enc->curr_canvas_mod_.use_argb = 1;
if (!WebPPictureAlloc(&enc->curr_canvas_mod_) ||
!WebPPictureCopy(&enc->curr_canvas_mod_, &enc->prev_canvas_) ||
!WebPPictureCopy(&enc->curr_canvas_mod_, &enc->prev_canvas_disposed_) ||
!WebPPictureCopy(&enc->curr_canvas_mod_, &enc->prev_to_prev_canvas_)) {
!WebPPictureCopy(&enc->curr_canvas_mod_, &enc->prev_canvas_disposed_)) {
goto Err;
}
WebPUtilClearPic(&enc->prev_canvas_, NULL);
WebPUtilClearPic(&enc->prev_to_prev_canvas_, NULL);
// Encoded frames.
ResetCounters(enc);
@ -256,7 +252,6 @@ void WebPAnimEncoderDelete(WebPAnimEncoder* enc) {
WebPPictureFree(&enc->curr_canvas_mod_);
WebPPictureFree(&enc->prev_canvas_);
WebPPictureFree(&enc->prev_canvas_disposed_);
WebPPictureFree(&enc->prev_to_prev_canvas_);
if (enc->encoded_frames_ != NULL) {
size_t i;
for (i = 0; i < enc->size_; ++i) {
@ -966,7 +961,6 @@ static int CacheFrame(WebPAnimEncoder* const enc, int duration,
}
// Update previous to previous and previous canvases for next call.
CopyPixels(&enc->prev_canvas_, &enc->prev_to_prev_canvas_);
CopyPixels(enc->curr_canvas_, &enc->prev_canvas_);
enc->is_first_frame_ = 0;
ok = 1;