void CCLayerTreeHost::prioritizeTextures(const LayerList& updateList)
{
// Use BackToFront since it's cheap and this isn't order-dependent.
typedef CCLayerIterator<LayerChromium, Vector<RefPtr<LayerChromium> >, RenderSurfaceChromium, CCLayerIteratorActions::BackToFront> CCLayerIteratorType;
m_contentsTextureManager->clearPriorities();
CCPriorityCalculator calculator;
CCLayerIteratorType end = CCLayerIteratorType::end(&updateList);
for (CCLayerIteratorType it = CCLayerIteratorType::begin(&updateList); it != end; ++it) {
if (it.representsItself())
it->setTexturePriorities(calculator);
else if (it.representsTargetRenderSurface()) {
if (it->maskLayer())
it->maskLayer()->setTexturePriorities(calculator);
if (it->replicaLayer() && it->replicaLayer()->maskLayer())
it->replicaLayer()->maskLayer()->setTexturePriorities(calculator);
}
}
size_t readbackBytes = 0;
size_t maxBackgroundTextureBytes = 0;
size_t contentsTextureBytes = 0;
// Start iteration at 1 to skip the root surface as it does not have a texture cost.
for (size_t i = 1; i < updateList.size(); ++i) {
LayerChromium* renderSurfaceLayer = updateList[i].get();
RenderSurfaceChromium* renderSurface = renderSurfaceLayer->renderSurface();
size_t bytes = TextureManager::memoryUseBytes(renderSurface->contentRect().size(), GraphicsContext3D::RGBA);
contentsTextureBytes += bytes;
if (renderSurface->backgroundFilters().isEmpty())
continue;
if (bytes > maxBackgroundTextureBytes)
maxBackgroundTextureBytes = bytes;
if (!readbackBytes)
readbackBytes = TextureManager::memoryUseBytes(m_deviceViewportSize, GraphicsContext3D::RGBA);
}
size_t renderSurfacesBytes = readbackBytes + maxBackgroundTextureBytes + contentsTextureBytes;
m_contentsTextureManager->prioritizeTextures(renderSurfacesBytes);
}
size_t CCLayerTreeHost::calculateMemoryForRenderSurfaces(const LayerList& updateList)
{
size_t readbackBytes = 0;
size_t maxBackgroundTextureBytes = 0;
size_t contentsTextureBytes = 0;
// Start iteration at 1 to skip the root surface as it does not have a texture cost.
for (size_t i = 1; i < updateList.size(); ++i) {
LayerChromium* renderSurfaceLayer = updateList[i].get();
RenderSurfaceChromium* renderSurface = renderSurfaceLayer->renderSurface();
size_t bytes = CCTexture::memorySizeBytes(renderSurface->contentRect().size(), GraphicsContext3D::RGBA);
contentsTextureBytes += bytes;
if (renderSurfaceLayer->backgroundFilters().isEmpty())
continue;
if (bytes > maxBackgroundTextureBytes)
maxBackgroundTextureBytes = bytes;
if (!readbackBytes)
readbackBytes = CCTexture::memorySizeBytes(m_deviceViewportSize, GraphicsContext3D::RGBA);
}
return readbackBytes + maxBackgroundTextureBytes + contentsTextureBytes;
}