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 "base/memory/ref_counted.h"
  11 #include "cc/resources/resource_format.h"
  12 #include "cc/resources/transferable_resource.h"
  13 #include "content/renderer/gpu/compositor_output_surface.h"
  14 #include "ui/gfx/size.h"
  15
  16 namespace cc {
  17 class CompositorFrameAck;
  18 }
  19
  20 namespace content {
  21 class FrameSwapMessageQueue;
  22
  23 // Implementation of CompositorOutputSurface that renders to textures which
  24 // are sent to the browser through the mailbox extension.
  25 // This class can be created only on the main thread, but then becomes pinned
  26 // to a fixed thread when bindToClient is called.
  27 class MailboxOutputSurface : public CompositorOutputSurface {
  28  public:
  29   MailboxOutputSurface(
  30       int32 routing_id,
  31       uint32 output_surface_id,
  32       const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
  33       scoped_ptr<cc::SoftwareOutputDevice> software_device,
  34       scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue,
  35       cc::ResourceFormat format);
  36   virtual ~MailboxOutputSurface();
  37
  38   // cc::OutputSurface implementation.
  39   virtual void EnsureBackbuffer() OVERRIDE;
  40   virtual void DiscardBackbuffer() OVERRIDE;
  41   virtual void Reshape(const gfx::Size& size, float scale_factor) OVERRIDE;
  42   virtual void BindFramebuffer() OVERRIDE;
  43   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
  44
  45  private:
  46   // CompositorOutputSurface overrides.
  47   virtual void OnSwapAck(uint32 output_surface_id,
  48                          const cc::CompositorFrameAck& ack) OVERRIDE;
  49
  50   size_t GetNumAcksPending();
  51
  52   struct TransferableFrame {
  53     TransferableFrame() : texture_id(0), sync_point(0) {}
  54
  55     TransferableFrame(uint32 texture_id,
  56                       const gpu::Mailbox& mailbox,
  57                       const gfx::Size size)
  58         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
  59
  60     uint32 texture_id;
  61     gpu::Mailbox mailbox;
  62     gfx::Size size;
  63     uint32 sync_point;
  64   };
  65
  66   TransferableFrame current_backing_;
  67   std::deque<TransferableFrame> pending_textures_;
  68   std::queue<TransferableFrame> returned_textures_;
  69
  70   uint32 fbo_;
  71   bool is_backbuffer_discarded_;
  72   cc::ResourceFormat format_;
  73 };
  74
  75 }  // namespace content
  76
  77 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_