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WebPAnimEncoder: Restore canvas before evaluating blending possibility.

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Without this, the canvas may have been modified in-between two
GenerateCandidate() calls.

Change-Id: I0364a269caabdf282c30a8fa3c61896f0247342e
This commit is contained in:
Urvang Joshi 2016-04-19 16:13:45 -07:00
parent 6e12e1e3d2
commit e3912d560b
1 changed files with 6 additions and 2 deletions
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8
src/mux/anim_encode.c
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@ -873,10 +873,14 @@ static WebPEncodingError GenerateCandidates(
WebPPicture* const curr_canvas = &enc->curr_canvas_copy_;
const WebPPicture* const prev_canvas =
is_dispose_none ? &enc->prev_canvas_ : &enc->prev_canvas_disposed_;
const int use_blending_ll =
int use_blending_ll;
int use_blending_lossy;
CopyCurrentCanvas(enc);
use_blending_ll =
!is_key_frame &&
IsLosslessBlendingPossible(prev_canvas, curr_canvas, &params->rect_ll_);
const int use_blending_lossy =
use_blending_lossy =
!is_key_frame &&
IsLossyBlendingPossible(prev_canvas, curr_canvas, &params->rect_lossy_,
config_lossy->quality);