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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
      6 #define CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/compiler_specific.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "base/memory/scoped_ptr.h"
     12 #include "cc/output/managed_memory_policy.h"
     13 #include "cc/output/output_surface.h"
     14 #include "content/public/browser/android/synchronous_compositor.h"
     15 #include "ui/gfx/transform.h"
     16 
     17 namespace cc {
     18 class ContextProvider;
     19 class CompositorFrameMetadata;
     20 }
     21 
     22 namespace content {
     23 
     24 class SynchronousCompositorClient;
     25 class SynchronousCompositorOutputSurface;
     26 class WebGraphicsContext3DCommandBufferImpl;
     27 
     28 class SynchronousCompositorOutputSurfaceDelegate {
     29  public:
     30    virtual void DidBindOutputSurface(
     31       SynchronousCompositorOutputSurface* output_surface) = 0;
     32   virtual void DidDestroySynchronousOutputSurface(
     33       SynchronousCompositorOutputSurface* output_surface) = 0;
     34   virtual void SetContinuousInvalidate(bool enable) = 0;
     35   virtual void UpdateFrameMetaData(
     36       const cc::CompositorFrameMetadata& frame_metadata) = 0;
     37   virtual void DidActivatePendingTree() = 0;
     38 
     39  protected:
     40   SynchronousCompositorOutputSurfaceDelegate() {}
     41   virtual ~SynchronousCompositorOutputSurfaceDelegate() {}
     42 };
     43 
     44 // Specialization of the output surface that adapts it to implement the
     45 // content::SynchronousCompositor public API. This class effects an "inversion
     46 // of control" - enabling drawing to be  orchestrated by the embedding
     47 // layer, instead of driven by the compositor internals - hence it holds two
     48 // 'client' pointers (|client_| in the OutputSurface baseclass and
     49 // GetDelegate()) which represent the consumers of the two roles in plays.
     50 // This class can be created only on the main thread, but then becomes pinned
     51 // to a fixed thread when BindToClient is called.
     52 class SynchronousCompositorOutputSurface
     53     : NON_EXPORTED_BASE(public cc::OutputSurface) {
     54  public:
     55   explicit SynchronousCompositorOutputSurface(int routing_id);
     56   virtual ~SynchronousCompositorOutputSurface();
     57 
     58   // OutputSurface.
     59   virtual bool ForcedDrawToSoftwareDevice() const OVERRIDE;
     60   virtual bool BindToClient(cc::OutputSurfaceClient* surface_client) OVERRIDE;
     61   virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE;
     62   virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
     63   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
     64 
     65   // Partial SynchronousCompositor API implementation.
     66   bool InitializeHwDraw(
     67       scoped_refptr<gfx::GLSurface> surface,
     68       scoped_refptr<cc::ContextProvider> offscreen_context);
     69   void ReleaseHwDraw();
     70   bool DemandDrawHw(gfx::Size surface_size,
     71                     const gfx::Transform& transform,
     72                     gfx::Rect viewport,
     73                     gfx::Rect clip,
     74                     bool stencil_enabled);
     75   bool DemandDrawSw(SkCanvas* canvas);
     76   void SetMemoryPolicy(const SynchronousCompositorMemoryPolicy& policy);
     77 
     78  private:
     79   class SoftwareDevice;
     80   friend class SoftwareDevice;
     81 
     82   // Private OutputSurface overrides.
     83   virtual void PostCheckForRetroactiveBeginFrame() OVERRIDE;
     84 
     85   void InvokeComposite(const gfx::Transform& transform,
     86                        gfx::Rect viewport,
     87                        gfx::Rect clip,
     88                        bool hardware);
     89   bool CalledOnValidThread() const;
     90   SynchronousCompositorOutputSurfaceDelegate* GetDelegate();
     91 
     92   int routing_id_;
     93   bool needs_begin_frame_;
     94   bool invoking_composite_;
     95   bool did_swap_buffer_;
     96 
     97   gfx::Transform cached_hw_transform_;
     98   gfx::Rect cached_hw_viewport_;
     99   gfx::Rect cached_hw_clip_;
    100 
    101   // Only valid (non-NULL) during a DemandDrawSw() call.
    102   SkCanvas* current_sw_canvas_;
    103 
    104   cc::ManagedMemoryPolicy memory_policy_;
    105 
    106   cc::OutputSurfaceClient* output_surface_client_;
    107 
    108   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorOutputSurface);
    109 };
    110 
    111 }  // namespace content
    112 
    113 #endif  // CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
    114