cc: Route offscreen context creation for compositor to the browser.

cc/single_thread_proxy.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/single_thread_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/debug/trace_event.h"
 #include "cc/draw_quad.h"
 #include "cc/layer_tree_host.h"
 #include "cc/layer_tree_impl.h"
 #include "cc/output_surface.h"
 #include "cc/prioritized_resource_manager.h"
 #include "cc/resource_update_controller.h"
 #include "cc/thread.h"
+#include "ui/gl/context_provider.h"
 
 namespace cc {
 
 scoped_ptr<Proxy> SingleThreadProxy::create(LayerTreeHost* layerTreeHost)
 {
     return make_scoped_ptr(new SingleThreadProxy(layerTreeHost)).PassAs<Proxy>();
 }
 
 SingleThreadProxy::SingleThreadProxy(LayerTreeHost* layerTreeHost)
     : Proxy(scoped_ptr<Thread>(NULL))
     , m_layerTreeHost(layerTreeHost)
     , m_outputSurfaceLost(false)
+    , m_createdOffscreenContextProvider(false)
     , m_rendererInitialized(false)
     , m_nextFrameIsNewlyCommittedFrame(false)
     , m_insideDraw(false)
     , m_totalCommitCount(0)
 {
     TRACE_EVENT0("cc", "SingleThreadProxy::SingleThreadProxy");
     DCHECK(Proxy::isMainThread());
     DCHECK(layerTreeHost);
 
     // Impl-side painting not supported without threaded compositing
@@ skipping 94 matching lines @@
 
 bool SingleThreadProxy::recreateOutputSurface()
 {
     TRACE_EVENT0("cc", "SingleThreadProxy::recreateContext");
     DCHECK(Proxy::isMainThread());
     DCHECK(m_outputSurfaceLost);
 
     scoped_ptr<OutputSurface> outputSurface = m_layerTreeHost->createOutputSurface();
     if (!outputSurface.get())
         return false;
+    scoped_refptr<ui::ContextProvider> offscreenContextProvider;
+    if (m_createdOffscreenContextProvider) {
+        offscreenContextProvider = m_layerTreeHost->client()->OffscreenContextProviderForMainThread();
+        if (!offscreenContextProvider->InitializeOnMainThread())
+            return false;
+    }
 
     bool initialized;
     {
         DebugScopedSetMainThreadBlocked mainThreadBlocked(this);
         DebugScopedSetImplThread impl(this);
         m_layerTreeHost->deleteContentsTexturesOnImplThread(m_layerTreeHostImpl->resourceProvider());
         initialized = m_layerTreeHostImpl->initializeRenderer(outputSurface.Pass());
         if (initialized) {
             m_RendererCapabilitiesForMainThread = m_layerTreeHostImpl->rendererCapabilities();
+            m_layerTreeHostImpl->resourceProvider()->setOffscreenContextProvider(offscreenContextProvider);
         }
     }
 
     if (initialized)
         m_outputSurfaceLost = false;
 
     return initialized;
 }
 
 void SingleThreadProxy::renderingStats(RenderingStats* stats)
@@ skipping 28 matching lines @@
         m_layerTreeHostImpl->beginCommit();
 
         m_layerTreeHost->contentsTextureManager()->pushTexturePrioritiesToBackings();
         m_layerTreeHost->beginCommitOnImplThread(m_layerTreeHostImpl.get());
 
         scoped_ptr<ResourceUpdateController> updateController =
             ResourceUpdateController::create(
                 NULL,
                 Proxy::mainThread(),
                 queue.Pass(),
-                m_layerTreeHostImpl->resourceProvider(),
-                hasImplThread());
+                m_layerTreeHostImpl->resourceProvider());
         updateController->finalize();
 
         m_layerTreeHost->finishCommitOnImplThread(m_layerTreeHostImpl.get());
 
         m_layerTreeHostImpl->commitComplete();
 
 #ifndef NDEBUG
         // In the single-threaded case, the scroll deltas should never be
         // touched on the impl layer tree.
         scoped_ptr<ScrollAndScaleSet> scrollInfo = m_layerTreeHostImpl->processScrollDeltas();
@@ skipping 164 matching lines @@
     NOTREACHED();
 }
 
 bool SingleThreadProxy::commitAndComposite()
 {
     DCHECK(Proxy::isMainThread());
 
     if (!m_layerTreeHost->initializeRendererIfNeeded())
         return false;
 
+    scoped_refptr<ui::ContextProvider> offscreenContextProvider;
+    if (m_RendererCapabilitiesForMainThread.usingOffscreenContext3d && m_layerTreeHost->needsOffscreenContext()) {
+        offscreenContextProvider = m_layerTreeHost->client()->OffscreenContextProviderForMainThread();
+        if (offscreenContextProvider->InitializeOnMainThread())
+            m_createdOffscreenContextProvider = true;
+        else
+            offscreenContextProvider = NULL;
+    }
+
     m_layerTreeHost->contentsTextureManager()->unlinkAndClearEvictedBackings();
 
     scoped_ptr<ResourceUpdateQueue> queue = make_scoped_ptr(new ResourceUpdateQueue);
     m_layerTreeHost->updateLayers(*(queue.get()), m_layerTreeHostImpl->memoryAllocationLimitBytes());
 
     m_layerTreeHost->willCommit();
     doCommit(queue.Pass());
-    bool result = doComposite();
+    bool result = doComposite(offscreenContextProvider);
     m_layerTreeHost->didBeginFrame();
     return result;
 }
 
-bool SingleThreadProxy::doComposite()
+bool SingleThreadProxy::doComposite(scoped_refptr<ui::ContextProvider> offscreenContextProvider)
 {
     DCHECK(!m_outputSurfaceLost);
     {
         DebugScopedSetImplThread impl(this);
         base::AutoReset<bool> markInside(&m_insideDraw, true);
 
+        m_layerTreeHostImpl->resourceProvider()->setOffscreenContextProvider(offscreenContextProvider);
+
         if (!m_layerTreeHostImpl->visible())
             return false;
 
         m_layerTreeHostImpl->animate(base::TimeTicks::Now(), base::Time::Now());
 
         // We guard prepareToDraw() with canDraw() because it always returns a valid frame, so can only
         // be used when such a frame is possible. Since drawLayers() depends on the result of
         // prepareToDraw(), it is guarded on canDraw() as well.
         if (!m_layerTreeHostImpl->canDraw())
             return false;
 
         LayerTreeHostImpl::FrameData frame;
         m_layerTreeHostImpl->prepareToDraw(frame);
         m_layerTreeHostImpl->drawLayers(frame);
         m_layerTreeHostImpl->didDrawAllLayers(frame);
         m_outputSurfaceLost = m_layerTreeHostImpl->isContextLost();
 
         m_layerTreeHostImpl->beginNextFrame();
     }
 
     if (m_outputSurfaceLost) {
+        if (ui::ContextProvider* offscreenContexts = m_layerTreeHostImpl->resourceProvider()->offscreenContextProvider())
+            offscreenContexts->VerifyContexts();
         m_layerTreeHost->didLoseOutputSurface();
         return false;
     }
 
     return true;
 }
 
 void SingleThreadProxy::didSwapFrame()
 {
     if (m_nextFrameIsNewlyCommittedFrame) {
         m_nextFrameIsNewlyCommittedFrame = false;
         m_layerTreeHost->didCommitAndDrawFrame();
     }
 }
 
 bool SingleThreadProxy::commitPendingForTesting()
 {
     return false;
 }
 
 skia::RefPtr<SkPicture> SingleThreadProxy::capturePicture()
 {
     // Requires impl-side painting, which is only supported in threaded compositing.
     NOTREACHED();
     return skia::RefPtr<SkPicture>();
 }
 
 }  // namespace cc