Drop frontbuffers with ui-use-gpu-process, synchronized with browser, decoupled from backbuffer dro…

content/common/gpu/image_transport_surface.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 #pragma once
 
 #if defined(ENABLE_GPU)
 
@@ skipping 12 matching lines @@
 #include "ui/gfx/size.h"
 #include "ui/gfx/surface/transport_dib.h"
 
 class GpuChannelManager;
 class GpuCommandBufferStub;
 
 struct GpuHostMsg_AcceleratedSurfaceNew_Params;
 struct GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params;
 struct GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params;
 struct GpuHostMsg_AcceleratedSurfaceRelease_Params;
+struct GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params;
 
 namespace gfx {
 class GLSurface;
 }
 
 namespace gpu {
 class GpuScheduler;
 
 namespace gles2 {
 class GLES2Decoder;
@@ skipping 17 matching lines @@
  public:
   ImageTransportSurface();
   virtual ~ImageTransportSurface();
 
   virtual void OnNewSurfaceACK(
       uint64 surface_id, TransportDIB::Handle surface_handle) = 0;
   virtual void OnBuffersSwappedACK() = 0;
   virtual void OnPostSubBufferACK() = 0;
   virtual void OnResizeViewACK() = 0;
   virtual void OnResize(gfx::Size size) = 0;
+  virtual void OnDiscardSurface(uint64 surface_id) = 0;
 
   // Creates the appropriate surface depending on the GL implementation.
   static scoped_refptr<gfx::GLSurface>
       CreateSurface(GpuChannelManager* manager,
                     GpuCommandBufferStub* stub,
                     const gfx::GLSurfaceHandle& handle);
  protected:
   // Used by certain implements of PostSubBuffer to determine
   // how much needs to be copied between frames.
   void GetRegionsToCopy(const gfx::Rect& previous_damage_rect,
@@ skipping 22 matching lines @@
   // Helper send functions. Caller fills in the surface specific params
   // like size and surface id. The helper fills in the rest.
   void SendAcceleratedSurfaceNew(
       GpuHostMsg_AcceleratedSurfaceNew_Params params);
   void SendAcceleratedSurfaceBuffersSwapped(
       GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params);
   void SendAcceleratedSurfacePostSubBuffer(
       GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params params);
   void SendAcceleratedSurfaceRelease(
       GpuHostMsg_AcceleratedSurfaceRelease_Params params);
+  void SendAcceleratedSurfaceSuggestDiscard(
+      GpuHostMsg_AcceleratedSurfaceSuggestDiscard_Params params);
   void SendResizeView(const gfx::Size& size);
 
   // Whether or not we should execute more commands.
   void SetScheduled(bool is_scheduled);
 
   void DeferToFence(base::Closure task);
 
   // Make the surface's context current.
   bool MakeCurrent();
 
   // Set the default swap interval on the surface.
   void SetSwapInterval();
 
   void Suspend();
 
  private:
   gpu::GpuScheduler* Scheduler();
   gpu::gles2::GLES2Decoder* Decoder();
 
   // IPC::Message handlers.
   void OnNewSurfaceACK(uint64 surface_handle, TransportDIB::Handle shm_handle);
   void OnBuffersSwappedACK();
   void OnPostSubBufferACK();
   void OnResizeViewACK();
+  void OnDiscardSurface(uint64 surface_id);
 
   // Backbuffer resize callback.
   void Resize(gfx::Size size);
 
   // Weak pointers that point to objects that outlive this helper.
   ImageTransportSurface* surface_;
   GpuChannelManager* manager_;
 
   base::WeakPtr<GpuCommandBufferStub> stub_;
   int32 route_id_;
@@ skipping 20 matching lines @@
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
   virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
 
   // ImageTransportSurface implementation.
   virtual void OnNewSurfaceACK(
       uint64 surface_handle, TransportDIB::Handle shm_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnPostSubBufferACK() OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
+  virtual void OnDiscardSurface(uint64 surface_id) OVERRIDE;
 
  protected:
   virtual ~PassThroughImageTransportSurface();
 
  private:
   scoped_ptr<ImageTransportHelper> helper_;
   gfx::Size new_size_;
   bool transport_;
   bool did_set_swap_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };
 
 #endif  // defined(ENABLE_GPU)
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_