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      1 // Copyright (c) 2012 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_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
      6 #define CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
      7 
      8 #include <queue>
      9 
     10 #include "cc/resources/transferable_resource.h"
     11 #include "content/renderer/gpu/compositor_output_surface.h"
     12 #include "ui/gfx/size.h"
     13 
     14 namespace cc {
     15 class CompositorFrameAck;
     16 }
     17 
     18 namespace content {
     19 
     20 // Implementation of CompositorOutputSurface that renders to textures which
     21 // are sent to the browser through the mailbox extension.
     22 // This class can be created only on the main thread, but then becomes pinned
     23 // to a fixed thread when bindToClient is called.
     24 class MailboxOutputSurface : public CompositorOutputSurface {
     25  public:
     26   MailboxOutputSurface(int32 routing_id,
     27                        uint32 output_surface_id,
     28                        WebGraphicsContext3DCommandBufferImpl* context3d,
     29                        cc::SoftwareOutputDevice* software);
     30   virtual ~MailboxOutputSurface();
     31 
     32   // cc::OutputSurface implementation.
     33   virtual void EnsureBackbuffer() OVERRIDE;
     34   virtual void DiscardBackbuffer() OVERRIDE;
     35   virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE;
     36   virtual void BindFramebuffer() OVERRIDE;
     37   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
     38 
     39  private:
     40   // CompositorOutputSurface overrides.
     41   virtual void OnSwapAck(uint32 output_surface_id,
     42                          const cc::CompositorFrameAck& ack) OVERRIDE;
     43 
     44   size_t GetNumAcksPending();
     45 
     46   struct TransferableFrame {
     47     TransferableFrame() : texture_id(0), sync_point(0) {}
     48 
     49     TransferableFrame(uint32 texture_id,
     50                       const gpu::Mailbox& mailbox,
     51                       const gfx::Size size)
     52         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
     53 
     54     uint32 texture_id;
     55     gpu::Mailbox mailbox;
     56     gfx::Size size;
     57     uint32 sync_point;
     58   };
     59 
     60   TransferableFrame current_backing_;
     61   std::deque<TransferableFrame> pending_textures_;
     62   std::queue<TransferableFrame> returned_textures_;
     63 
     64   uint32 fbo_;
     65   bool is_backbuffer_discarded_;
     66 };
     67 
     68 }  // namespace content
     69 
     70 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
     71