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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 <vector>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/compiler_specific.h"
     12 #include "base/memory/ref_counted.h"
     13 #include "base/memory/scoped_ptr.h"
     14 #include "cc/output/compositor_frame.h"
     15 #include "cc/output/managed_memory_policy.h"
     16 #include "cc/output/output_surface.h"
     17 #include "content/public/browser/android/synchronous_compositor.h"
     18 #include "ipc/ipc_message.h"
     19 #include "ui/gfx/transform.h"
     20 
     21 namespace cc {
     22 class ContextProvider;
     23 class CompositorFrameMetadata;
     24 }
     25 
     26 namespace IPC {
     27 class Message;
     28 }
     29 
     30 namespace content {
     31 
     32 class FrameSwapMessageQueue;
     33 class SynchronousCompositorClient;
     34 class SynchronousCompositorOutputSurface;
     35 class WebGraphicsContext3DCommandBufferImpl;
     36 
     37 class SynchronousCompositorOutputSurfaceDelegate {
     38  public:
     39    virtual void DidBindOutputSurface(
     40       SynchronousCompositorOutputSurface* output_surface) = 0;
     41   virtual void DidDestroySynchronousOutputSurface(
     42       SynchronousCompositorOutputSurface* output_surface) = 0;
     43   virtual void SetContinuousInvalidate(bool enable) = 0;
     44   virtual void DidActivatePendingTree() = 0;
     45 
     46  protected:
     47   SynchronousCompositorOutputSurfaceDelegate() {}
     48   virtual ~SynchronousCompositorOutputSurfaceDelegate() {}
     49 };
     50 
     51 // Specialization of the output surface that adapts it to implement the
     52 // content::SynchronousCompositor public API. This class effects an "inversion
     53 // of control" - enabling drawing to be  orchestrated by the embedding
     54 // layer, instead of driven by the compositor internals - hence it holds two
     55 // 'client' pointers (|client_| in the OutputSurface baseclass and
     56 // GetDelegate()) which represent the consumers of the two roles in plays.
     57 // This class can be created only on the main thread, but then becomes pinned
     58 // to a fixed thread when BindToClient is called.
     59 class SynchronousCompositorOutputSurface
     60     : NON_EXPORTED_BASE(public cc::OutputSurface) {
     61  public:
     62   explicit SynchronousCompositorOutputSurface(
     63       int routing_id,
     64       scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue);
     65   virtual ~SynchronousCompositorOutputSurface();
     66 
     67   // OutputSurface.
     68   virtual bool BindToClient(cc::OutputSurfaceClient* surface_client) OVERRIDE;
     69   virtual void Reshape(const gfx::Size& size, float scale_factor) OVERRIDE;
     70   virtual void SetNeedsBeginFrame(bool enable) OVERRIDE;
     71   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
     72 
     73   // Partial SynchronousCompositor API implementation.
     74   bool InitializeHwDraw(
     75       scoped_refptr<cc::ContextProvider> onscreen_context_provider);
     76   void ReleaseHwDraw();
     77   scoped_ptr<cc::CompositorFrame> DemandDrawHw(
     78       gfx::Size surface_size,
     79       const gfx::Transform& transform,
     80       gfx::Rect viewport,
     81       gfx::Rect clip,
     82       gfx::Rect viewport_rect_for_tile_priority,
     83       const gfx::Transform& transform_for_tile_priority);
     84   void ReturnResources(const cc::CompositorFrameAck& frame_ack);
     85   scoped_ptr<cc::CompositorFrame> DemandDrawSw(SkCanvas* canvas);
     86   void SetMemoryPolicy(const SynchronousCompositorMemoryPolicy& policy);
     87   void GetMessagesToDeliver(ScopedVector<IPC::Message>* messages);
     88 
     89  private:
     90   class SoftwareDevice;
     91   friend class SoftwareDevice;
     92 
     93   void InvokeComposite(const gfx::Transform& transform,
     94                        gfx::Rect viewport,
     95                        gfx::Rect clip,
     96                        gfx::Rect viewport_rect_for_tile_priority,
     97                        gfx::Transform transform_for_tile_priority,
     98                        bool hardware_draw);
     99   bool CalledOnValidThread() const;
    100   SynchronousCompositorOutputSurfaceDelegate* GetDelegate();
    101 
    102   int routing_id_;
    103   bool needs_begin_frame_;
    104   bool invoking_composite_;
    105 
    106   gfx::Transform cached_hw_transform_;
    107   gfx::Rect cached_hw_viewport_;
    108   gfx::Rect cached_hw_clip_;
    109   gfx::Rect cached_hw_viewport_rect_for_tile_priority_;
    110   gfx::Transform cached_hw_transform_for_tile_priority_;
    111 
    112   // Only valid (non-NULL) during a DemandDrawSw() call.
    113   SkCanvas* current_sw_canvas_;
    114 
    115   cc::ManagedMemoryPolicy memory_policy_;
    116 
    117   cc::OutputSurfaceClient* output_surface_client_;
    118   scoped_ptr<cc::CompositorFrame> frame_holder_;
    119 
    120   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;
    121 
    122   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorOutputSurface);
    123 };
    124 
    125 }  // namespace content
    126 
    127 #endif  // CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
    128