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AnimEncoder API: Compute change rectangle for first frame too.

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Earlier, we were always using full canvas for first frame.

Change-Id: Ib8d32961682c4b07010ea559a71dd59ab9ec0157
This commit is contained in:
Urvang Joshi 2015-01-06 16:26:55 -08:00
parent eec423abe9
commit ef3c39bbd2
1 changed files with 8 additions and 4 deletions
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12
src/mux/anim_encode.c
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@ -391,12 +391,15 @@ static WEBP_INLINE void SnapToEvenOffsets(FrameRect* const rect) {
// current frame. The initial guess for 'rect' will be the full canvas.
static int GetSubRect(const WebPPicture* const prev_canvas,
const WebPPicture* const curr_canvas, int is_key_frame,
FrameRect* const rect, WebPPicture* const sub_frame) {
int is_first_frame, FrameRect* const rect,
WebPPicture* const sub_frame) {
rect->x_offset_ = 0;
rect->y_offset_ = 0;
rect->width_ = curr_canvas->width;
rect->height_ = curr_canvas->height;
if (!is_key_frame) { // Optimize frame rectangle.
if (!is_key_frame || is_first_frame) { // Optimize frame rectangle.
// Note: This behaves as expected for first frame, as 'prev_canvas' is
// initialized to a fully transparent canvas in the beginning.
MinimizeChangeRectangle(prev_canvas, curr_canvas, rect);
}
SnapToEvenOffsets(rect);
@ -802,6 +805,7 @@ static WebPEncodingError SetFrame(
const WebPPicture* const prev_canvas = &enc->prev_canvas_;
Candidate candidates[CANDIDATE_COUNT];
const int is_lossless = frame_options->config.lossless;
const int is_first_frame = enc->is_first_frame_;
int try_dispose_none = 1; // Default.
FrameRect rect_none;
@ -833,7 +837,7 @@ static WebPEncodingError SetFrame(
}
// Change-rectangle assuming previous frame was DISPOSE_NONE.
GetSubRect(prev_canvas, curr_canvas, is_key_frame,
GetSubRect(prev_canvas, curr_canvas, is_key_frame, is_first_frame,
&rect_none, &sub_frame_none);
if (dispose_bg_possible) {
@ -842,7 +846,7 @@ static WebPEncodingError SetFrame(
CopyPixels(prev_canvas, prev_canvas_disposed);
DisposeFrameRectangle(WEBP_MUX_DISPOSE_BACKGROUND, &enc->prev_webp_rect,
prev_canvas_disposed);
GetSubRect(prev_canvas_disposed, curr_canvas, is_key_frame,
GetSubRect(prev_canvas_disposed, curr_canvas, is_key_frame, is_first_frame,
&rect_bg, &sub_frame_bg);
if (enc->options_.minimize_size) { // Try both dispose methods.