void CCLayerTreeHostImpl::drawLayers()
{
TRACE_EVENT("CCLayerTreeHostImpl::drawLayers", this, 0);
ASSERT(m_layerRenderer);
if (!rootLayer())
return;
CCRenderPassList passes;
CCLayerList renderSurfaceLayerList;
calculateRenderPasses(passes, renderSurfaceLayerList);
optimizeRenderPasses(passes);
m_layerRenderer->beginDrawingFrame();
for (size_t i = 0; i < passes.size(); ++i)
m_layerRenderer->drawRenderPass(passes[i].get());
typedef CCLayerIterator<CCLayerImpl, Vector<CCLayerImpl*>, CCRenderSurface, CCLayerIteratorActions::BackToFront> CCLayerIteratorType;
CCLayerIteratorType end = CCLayerIteratorType::end(&renderSurfaceLayerList);
for (CCLayerIteratorType it = CCLayerIteratorType::begin(&renderSurfaceLayerList); it != end; ++it) {
if (it.representsItself() && !it->visibleLayerRect().isEmpty())
it->didDraw();
}
m_layerRenderer->finishDrawingFrame();
++m_frameNumber;
// The next frame should start by assuming nothing has changed, and changes are noted as they occur.
rootLayer()->resetAllChangeTrackingForSubtree();
}
void CCDirectRenderer::decideRenderPassAllocationsForFrame(const CCRenderPassList& renderPassesInDrawOrder)
{
HashMap<CCRenderPass::Id, const CCRenderPass*> renderPassesInFrame;
for (size_t i = 0; i < renderPassesInDrawOrder.size(); ++i)
renderPassesInFrame.set(renderPassesInDrawOrder[i]->id(), renderPassesInDrawOrder[i]);
Vector<CCRenderPass::Id> passesToDelete;
HashMap<CCRenderPass::Id, OwnPtr<CachedTexture> >::const_iterator passIterator;
for (passIterator = m_renderPassTextures.begin(); passIterator != m_renderPassTextures.end(); ++passIterator) {
#if WTF_NEW_HASHMAP_ITERATORS_INTERFACE
const CCRenderPass* renderPassInFrame = renderPassesInFrame.get(passIterator->key);
#else
const CCRenderPass* renderPassInFrame = renderPassesInFrame.get(passIterator->first);
#endif
if (!renderPassInFrame) {
#if WTF_NEW_HASHMAP_ITERATORS_INTERFACE
passesToDelete.append(passIterator->key);
#else
passesToDelete.append(passIterator->first);
#endif
continue;
}
const IntSize& requiredSize = renderPassTextureSize(renderPassInFrame);
GC3Denum requiredFormat = renderPassTextureFormat(renderPassInFrame);
#if WTF_NEW_HASHMAP_ITERATORS_INTERFACE
CachedTexture* texture = passIterator->value.get();
#else
CachedTexture* texture = passIterator->second.get();
#endif
ASSERT(texture);
if (texture->id() && (texture->size() != requiredSize || texture->format() != requiredFormat))
texture->free();
}
// Delete RenderPass textures from the previous frame that will not be used again.
for (size_t i = 0; i < passesToDelete.size(); ++i)
m_renderPassTextures.remove(passesToDelete[i]);
for (size_t i = 0; i < renderPassesInDrawOrder.size(); ++i) {
if (!m_renderPassTextures.contains(renderPassesInDrawOrder[i]->id())) {
OwnPtr<CachedTexture> texture = CachedTexture::create(m_resourceProvider);
m_renderPassTextures.set(renderPassesInDrawOrder[i]->id(), texture.release());
}
}
}
void CCDirectRenderer::drawFrame(const CCRenderPassList& renderPassesInDrawOrder, const CCRenderPassIdHashMap& renderPassesById)
{
const CCRenderPass* rootRenderPass = renderPassesInDrawOrder.last();
ASSERT(rootRenderPass);
DrawingFrame frame;
frame.renderPassesById = &renderPassesById;
frame.rootRenderPass = rootRenderPass;
frame.rootDamageRect = capabilities().usingPartialSwap ? rootRenderPass->damageRect() : rootRenderPass->outputRect();
frame.rootDamageRect.intersect(IntRect(IntPoint::zero(), viewportSize()));
beginDrawingFrame(frame);
for (size_t i = 0; i < renderPassesInDrawOrder.size(); ++i)
drawRenderPass(frame, renderPassesInDrawOrder[i]);
finishDrawingFrame(frame);
}
void CCLayerTreeHostImpl::optimizeRenderPasses(CCRenderPassList& passes)
{
TRACE_EVENT1("webkit", "CCLayerTreeHostImpl::optimizeRenderPasses", "passes.size()", static_cast<long long unsigned>(passes.size()));
bool haveDamageRect = layerRendererCapabilities().usingPartialSwap;
// FIXME: compute overdraw metrics only occasionally, not every frame.
CCOverdrawCounts overdrawCounts;
for (unsigned i = 0; i < passes.size(); ++i) {
FloatRect damageRect = passes[i]->targetSurface()->damageTracker()->currentDamageRect();
passes[i]->optimizeQuads(haveDamageRect, damageRect, &overdrawCounts);
}
float normalization = 1000.f / (m_layerRenderer->viewportWidth() * m_layerRenderer->viewportHeight());
PlatformSupport::histogramCustomCounts("Renderer4.pixelOverdrawOpaque", static_cast<int>(normalization * overdrawCounts.m_pixelsDrawnOpaque), 100, 1000000, 50);
PlatformSupport::histogramCustomCounts("Renderer4.pixelOverdrawTransparent", static_cast<int>(normalization * overdrawCounts.m_pixelsDrawnTransparent), 100, 1000000, 50);
PlatformSupport::histogramCustomCounts("Renderer4.pixelOverdrawCulled", static_cast<int>(normalization * overdrawCounts.m_pixelsCulled), 100, 1000000, 50);
}