bool CompositingCoordinator::paintToSurface(const IntSize& size, CoordinatedSurface::Flags flags, uint32_t& atlasID, IntPoint& offset, CoordinatedSurface::Client* client)
{
for (unsigned i = 0; i < m_updateAtlases.size(); ++i) {
UpdateAtlas* atlas = m_updateAtlases[i].get();
if (atlas->supportsAlpha() == (flags & CoordinatedSurface::SupportsAlpha)) {
// This will be false if there is no available buffer space.
if (atlas->paintOnAvailableBuffer(size, atlasID, offset, client))
return true;
}
}
static const int ScratchBufferDimension = 1024; // Should be a power of two.
m_updateAtlases.append(std::make_unique<UpdateAtlas>(this, ScratchBufferDimension, flags));
scheduleReleaseInactiveAtlases();
return m_updateAtlases.last()->paintOnAvailableBuffer(size, atlasID, offset, client);
}
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);
}
void CompositingCoordinator::releaseInactiveAtlasesTimerFired(Timer<CompositingCoordinator>*)
{
// We always want to keep one atlas for root contents layer.
std::unique_ptr<UpdateAtlas> atlasToKeepAnyway;
bool foundActiveAtlasForRootContentsLayer = false;
for (int i = m_updateAtlases.size() - 1; i >= 0; --i) {
UpdateAtlas* atlas = m_updateAtlases[i].get();
if (!atlas->isInUse())
atlas->addTimeInactive(ReleaseInactiveAtlasesTimerInterval);
bool usableForRootContentsLayer = !atlas->supportsAlpha();
if (atlas->isInactive()) {
if (!foundActiveAtlasForRootContentsLayer && !atlasToKeepAnyway && usableForRootContentsLayer)
atlasToKeepAnyway = std::move(m_updateAtlases[i]);
m_updateAtlases.remove(i);
} else if (usableForRootContentsLayer)
foundActiveAtlasForRootContentsLayer = true;
}
if (!foundActiveAtlasForRootContentsLayer && atlasToKeepAnyway)
m_updateAtlases.append(atlasToKeepAnyway.release());
if (m_updateAtlases.size() <= 1)
m_releaseInactiveAtlasesTimer.stop();
}
void CoordinatedLayerTreeHost::releaseInactiveAtlasesTimerFired(Timer<CoordinatedLayerTreeHost>*)
{
// We always want to keep one atlas for non-composited content.
OwnPtr<UpdateAtlas> atlasToKeepAnyway;
bool foundActiveAtlasForNonCompositedContent = false;
for (int i = m_updateAtlases.size() - 1; i >= 0; --i) {
UpdateAtlas* atlas = m_updateAtlases[i].get();
if (!atlas->isInUse())
atlas->addTimeInactive(ReleaseInactiveAtlasesTimerInterval);
bool usableForNonCompositedContent = !atlas->supportsAlpha();
if (atlas->isInactive()) {
if (!foundActiveAtlasForNonCompositedContent && !atlasToKeepAnyway && usableForNonCompositedContent)
atlasToKeepAnyway = m_updateAtlases[i].release();
m_updateAtlases.remove(i);
} else if (usableForNonCompositedContent)
foundActiveAtlasForNonCompositedContent = true;
}
if (!foundActiveAtlasForNonCompositedContent && atlasToKeepAnyway)
m_updateAtlases.append(atlasToKeepAnyway.release());
if (m_updateAtlases.size() <= 1)
m_releaseInactiveAtlasesTimer.stop();
}