src/content/browser/android/in_process/synchronous_compositor_output_surface.h

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