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/geometry/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       const scoped_refptr<ContextProviderCommandBuffer>&
  34           worker_context_provider,
  35       scoped_ptr<cc::SoftwareOutputDevice> software_device,
  36       scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue,
  37       cc::ResourceFormat format);
  38   ~MailboxOutputSurface() override;
  39
  40   // cc::OutputSurface implementation.
  41   void EnsureBackbuffer() override;
  42   void DiscardBackbuffer() override;
  43   void Reshape(const gfx::Size& size, float scale_factor) override;
  44   void BindFramebuffer() override;
  45   void SwapBuffers(cc::CompositorFrame* frame) override;
  46
  47  private:
  48   // CompositorOutputSurface overrides.
  49   void OnSwapAck(uint32 output_surface_id,
  50                  const cc::CompositorFrameAck& ack) override;
  51
  52   size_t GetNumAcksPending();
  53
  54   struct TransferableFrame {
  55     TransferableFrame() : texture_id(0), sync_point(0) {}
  56
  57     TransferableFrame(uint32 texture_id,
  58                       const gpu::Mailbox& mailbox,
  59                       const gfx::Size size)
  60         : texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
  61
  62     uint32 texture_id;
  63     gpu::Mailbox mailbox;
  64     gfx::Size size;
  65     uint32 sync_point;
  66   };
  67
  68   TransferableFrame current_backing_;
  69   std::deque<TransferableFrame> pending_textures_;
  70   std::queue<TransferableFrame> returned_textures_;
  71
  72   uint32 fbo_;
  73   bool is_backbuffer_discarded_;
  74   cc::ResourceFormat format_;
  75 };
  76
  77 }  // namespace content
  78
  79 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_