cc::OutputSurfaceClient::InitializeForGL

cc/trees/layer_tree_host_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 32 matching lines @@
 class MemoryHistory;
 class RenderingStatsInstrumentation;
 class RenderPassDrawQuad;
 class ResourceProvider;
 class TopControlsManager;
 struct RendererCapabilities;
 
 // LayerTreeHost->Proxy callback interface.
 class LayerTreeHostImplClient {
  public:
+  virtual void DidTryInitializeRendererOnImplThread(
+      bool success,
+      scoped_refptr<ContextProvider> offscreen_context_provider) = 0;
   virtual void DidLoseOutputSurfaceOnImplThread() = 0;
   virtual void OnSwapBuffersCompleteOnImplThread() = 0;
   virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
                                         base::TimeDelta interval) = 0;
   virtual void BeginFrameOnImplThread(base::TimeTicks frame_time) = 0;
   virtual void OnCanDrawStateChanged(bool can_draw) = 0;
   virtual void OnHasPendingTreeStateChanged(bool has_pending_tree) = 0;
   virtual void SetNeedsRedrawOnImplThread() = 0;
   virtual void SetNeedsRedrawRectOnImplThread(gfx::Rect damage_rect) = 0;
   virtual void DidInitializeVisibleTileOnImplThread() = 0;
@@ skipping 134 matching lines @@
   virtual CompositorFrameMetadata MakeCompositorFrameMetadata() const OVERRIDE;
   virtual bool AllowPartialSwap() const OVERRIDE;
 
   // TileManagerClient implementation.
   virtual void ScheduleManageTiles() OVERRIDE;
   virtual void DidInitializeVisibleTile() OVERRIDE;
   virtual bool ShouldForceTileUploadsRequiredForActivationToComplete() const
       OVERRIDE;
 
   // OutputSurfaceClient implementation.
+  virtual bool DeferredInitialize(
+      scoped_refptr<ContextProvider> offscreen_context_provider) OVERRIDE;

[danakj, 2013/06/05 21:53:32]

Is the embedder just going to have to always provide this provider here?

[boliu, 2013/06/05 22:17:27]

Part 3 of this patch will just pass in NULL for now.

The eventual plan (not reviewed by anyone yet), this takes a few steps:

1) First make sure LTHClient is creating the in process context for webview:
https://codereview.chromium.org/16235005/
2) Pre-create this context when output surface is created (cheap for in-process
context) and hold a ref to be passed here.
3) Move the logic to determine if an offscreen context is needed (I think if
filters are in use?) to impl side. Basically just pass the boolean over in a
commit.
4) Then finally, DeferredInitialize can decide if it's actually needed and drop
the ref if it's not.

Dreaming big about supporting repeatedly going into and out of GL mode
synchronously, dealing with lost offscreen context before the first hardware
init, and possibly clean up this code up for all platforms:

Have the compositor thread offscreen context be created/destroyed entirely on
the compositor thread. Then can avoid the set_leak_on_destroy hack as well.

   virtual void SetNeedsRedrawRect(gfx::Rect rect) OVERRIDE;
   virtual void OnVSyncParametersChanged(base::TimeTicks timebase,
                                         base::TimeDelta interval) OVERRIDE;
   virtual void BeginFrame(base::TimeTicks frame_time)
       OVERRIDE;
   virtual void OnSendFrameToParentCompositorAck(const CompositorFrameAck& ack)
       OVERRIDE;
 
   // Called from LayerTreeImpl.
   void OnCanDrawStateChangedForTree();
@@ skipping 173 matching lines @@
 
   const AnimationRegistrar::AnimationControllerMap&
       active_animation_controllers() const {
     return animation_registrar_->active_animation_controllers();
   }
 
   LayerTreeHostImplClient* client_;
   Proxy* proxy_;
 
  private:
+  bool DoInitializeRenderer(scoped_ptr<OutputSurface> output_surface,
+                            bool is_deffered_init);
+
   void AnimatePageScale(base::TimeTicks monotonic_time);
   void AnimateScrollbars(base::TimeTicks monotonic_time);
   void AnimateTopControls(base::TimeTicks monotonic_time);
 
   gfx::Vector2dF ScrollLayerWithViewportSpaceDelta(
       LayerImpl* layer_impl,
       float scale_from_viewport_to_screen_space,
       gfx::PointF viewport_point,
       gfx::Vector2dF viewport_delta);
 
@@ skipping 96 matching lines @@
   scoped_ptr<AnimationRegistrar> animation_registrar_;
 
   RenderingStatsInstrumentation* rendering_stats_instrumentation_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_