void WEBPImageDecoder::initializeNewFrame(size_t index) {
if (!(m_formatFlags & ANIMATION_FLAG)) {
ASSERT(!index);
return;
}
WebPIterator animatedFrame;
WebPDemuxGetFrame(m_demux, index + 1, &animatedFrame);
ASSERT(animatedFrame.complete == 1);
ImageFrame* buffer = &m_frameBufferCache[index];
IntRect frameRect(animatedFrame.x_offset, animatedFrame.y_offset,
animatedFrame.width, animatedFrame.height);
buffer->setOriginalFrameRect(
intersection(frameRect, IntRect(IntPoint(), size())));
buffer->setDuration(animatedFrame.duration);
buffer->setDisposalMethod(animatedFrame.dispose_method ==
WEBP_MUX_DISPOSE_BACKGROUND
? ImageFrame::DisposeOverwriteBgcolor
: ImageFrame::DisposeKeep);
buffer->setAlphaBlendSource(animatedFrame.blend_method == WEBP_MUX_BLEND
? ImageFrame::BlendAtopPreviousFrame
: ImageFrame::BlendAtopBgcolor);
buffer->setRequiredPreviousFrameIndex(
findRequiredPreviousFrame(index, !animatedFrame.has_alpha));
WebPDemuxReleaseIterator(&animatedFrame);
}
void GIFImageDecoder::initializeNewFrame(size_t index)
{
ImageFrame* buffer = &m_frameBufferCache[index];
const GIFFrameContext* frameContext = m_reader->frameContext(index);
buffer->setOriginalFrameRect(intersection(frameContext->frameRect(), IntRect(IntPoint(), size())));
buffer->setDuration(frameContext->delayTime());
buffer->setDisposalMethod(frameContext->disposalMethod());
buffer->setRequiredPreviousFrameIndex(findRequiredPreviousFrame(index, false));
}