void LayerRendererChromium::drawLayers()
{
// FIXME: use the frame begin time from the overall compositor scheduler.
// This value is currently inaccessible because it is up in Chromium's
// RenderWidget.
m_headsUpDisplay->onFrameBegin(currentTime());
if (!rootLayer())
return;
size_t contentsMemoryUseBytes = m_contentsTextureAllocator->currentMemoryUseBytes();
m_renderSurfaceTextureManager->setMemoryLimitBytes(TextureManager::highLimitBytes() - contentsMemoryUseBytes);
drawLayersInternal();
if (TextureManager::reclaimLimitBytes() > contentsMemoryUseBytes)
m_renderSurfaceTextureManager->reduceMemoryToLimit(TextureManager::reclaimLimitBytes() - contentsMemoryUseBytes);
else
m_renderSurfaceTextureManager->reduceMemoryToLimit(0);
m_renderSurfaceTextureManager->deleteEvictedTextures(m_renderSurfaceTextureAllocator.get());
if (settings().compositeOffscreen)
copyOffscreenTextureToDisplay();
}
void LayerRendererChromium::updateAndDrawLayers()
{
// FIXME: use the frame begin time from the overall compositor scheduler.
// This value is currently inaccessible because it is up in Chromium's
// RenderWidget.
m_headsUpDisplay->onFrameBegin(currentTime());
ASSERT(m_hardwareCompositing);
if (!m_rootLayer)
return;
updateRootLayerContents();
// Recheck that we still have a root layer. This may become null if
// compositing gets turned off during a paint operation.
if (!m_rootLayer)
return;
{
TRACE_EVENT("LayerRendererChromium::synchronizeTrees", this, 0);
m_rootCCLayerImpl = TreeSynchronizer::synchronizeTrees(m_rootLayer.get(), m_rootCCLayerImpl.get());
}
LayerList renderSurfaceLayerList;
updateLayers(renderSurfaceLayerList);
// Before drawLayers:
if (hardwareCompositing() && m_contextSupportsLatch) {
// FIXME: The multithreaded compositor case will not work as long as
// copyTexImage2D resolves to the parent texture, because the main
// thread can execute WebGL calls on the child context at any time,
// potentially clobbering the parent texture that is being renderered
// by the compositor thread.
if (m_childContextsWereCopied) {
Extensions3DChromium* parentExt = static_cast<Extensions3DChromium*>(m_context->getExtensions());
// For each child context:
// glWaitLatch(Offscreen->Compositor);
ChildContextMap::iterator i = m_childContexts.begin();
for (; i != m_childContexts.end(); ++i) {
Extensions3DChromium* childExt = static_cast<Extensions3DChromium*>(i->first->getExtensions());
GC3Duint latchId;
childExt->getChildToParentLatchCHROMIUM(&latchId);
parentExt->waitLatchCHROMIUM(latchId);
}
}
// Reset to false to indicate that we have consumed the dirty child
// contexts' parent textures. (This is only useful when the compositor
// is multithreaded.)
m_childContextsWereCopied = false;
}
drawLayers(renderSurfaceLayerList);
m_textureManager->unprotectAllTextures();
// After drawLayers:
if (hardwareCompositing() && m_contextSupportsLatch) {
Extensions3DChromium* parentExt = static_cast<Extensions3DChromium*>(m_context->getExtensions());
// For each child context:
// glSetLatch(Compositor->Offscreen);
ChildContextMap::iterator i = m_childContexts.begin();
for (; i != m_childContexts.end(); ++i) {
Extensions3DChromium* childExt = static_cast<Extensions3DChromium*>(i->first->getExtensions());
GC3Duint latchId;
childExt->getParentToChildLatchCHROMIUM(&latchId);
parentExt->setLatchCHROMIUM(latchId);
}
}
if (isCompositingOffscreen())
copyOffscreenTextureToDisplay();
}