PassOwnPtr<WebCore::GraphicsContext> LayerTreeCoordinator::beginContentUpdate(const WebCore::IntSize& size, ShareableBitmap::Flags flags, ShareableSurface::Handle& handle, WebCore::IntPoint& offset)
{
OwnPtr<WebCore::GraphicsContext> graphicsContext;
for (int i = 0; i < m_updateAtlases.size(); ++i) {
UpdateAtlas* atlas = m_updateAtlases[i].get();
if (atlas->flags() == flags) {
// This will return null if there is no available buffer space.
graphicsContext = atlas->beginPaintingOnAvailableBuffer(handle, size, offset);
if (graphicsContext)
return graphicsContext.release();
}
}
static const int ScratchBufferDimension = 1024; // Should be a power of two.
m_updateAtlases.append(adoptPtr(new UpdateAtlas(ScratchBufferDimension, flags)));
return m_updateAtlases.last()->beginPaintingOnAvailableBuffer(handle, size, offset);
}
PassOwnPtr<GraphicsContext> CoordinatedLayerTreeHost::beginContentUpdate(const IntSize& size, CoordinatedSurface::Flags flags, uint32_t& atlasID, IntPoint& offset)
{
OwnPtr<GraphicsContext> graphicsContext;
for (unsigned i = 0; i < m_updateAtlases.size(); ++i) {
UpdateAtlas* atlas = m_updateAtlases[i].get();
if (atlas->supportsAlpha() == (flags & CoordinatedSurface::SupportsAlpha)) {
// This will return null if there is no available buffer space.
graphicsContext = atlas->beginPaintingOnAvailableBuffer(atlasID, size, offset);
if (graphicsContext)
return graphicsContext.release();
}
}
static const int ScratchBufferDimension = 1024; // Should be a power of two.
m_updateAtlases.append(adoptPtr(new UpdateAtlas(this, ScratchBufferDimension, flags)));
scheduleReleaseInactiveAtlases();
return m_updateAtlases.last()->beginPaintingOnAvailableBuffer(atlasID, size, offset);
}