content/renderer/gpu/mailbox_output_surface.h

   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/resource_format.h"
  11 #include "cc/resources/transferable_resource.h"
  12 #include "content/renderer/gpu/compositor_output_surface.h"
  13 #include "ui/gfx/size.h"
  14
  15 namespace cc {
  16 class CompositorFrameAck;
  17 }
  18
  19 namespace content {
  20
  21 // Implementation of CompositorOutputSurface that renders to textures which
  22 // are sent to the browser through the mailbox extension.
  23 // This class can be created only on the main thread, but then becomes pinned
  24 // to a fixed thread when bindToClient is called.
  25 class MailboxOutputSurface : public CompositorOutputSurface {
  26  public:
  27   MailboxOutputSurface(
  28       int32 routing_id,
  29       uint32 output_surface_id,
  30       const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
  31       scoped_ptr<cc::SoftwareOutputDevice> software_device,
  32       cc::ResourceFormat format);
  33   virtual ~MailboxOutputSurface();
  34
  35   // cc::OutputSurface implementation.
  36   virtual void EnsureBackbuffer() OVERRIDE;
  37   virtual void DiscardBackbuffer() OVERRIDE;
  38   virtual void Reshape(const gfx::Size& size, float scale_factor) OVERRIDE;
  39   virtual void BindFramebuffer() OVERRIDE;
  40   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
  41
  42  private:
  43   // CompositorOutputSurface overrides.
  44   virtual void OnSwapAck(uint32 output_surface_id,
  45                          const cc::CompositorFrameAck& ack) OVERRIDE;
  46
  47   size_t GetNumAcksPending();
  48
  49   struct TransferableFrame {
  50     TransferableFrame() : texture_id(0), sync_point(0) {}
  51
  52     TransferableFrame(uint32 texture_id,
  53                       const gpu::Mailbox& mailbox,
  54                       const gfx::Size size)
  55         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
  56
  57     uint32 texture_id;
  58     gpu::Mailbox mailbox;
  59     gfx::Size size;
  60     uint32 sync_point;
  61   };
  62
  63   TransferableFrame current_backing_;
  64   std::deque<TransferableFrame> pending_textures_;
  65   std::queue<TransferableFrame> returned_textures_;
  66
  67   uint32 fbo_;
  68   bool is_backbuffer_discarded_;
  69   cc::ResourceFormat format_;
  70 };
  71
  72 }  // namespace content
  73
  74 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_