Infrastructure for temportarily relinquishing GPU resources.

content/common/gpu/gpu_channel_manager.cc

 // 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.
 
 #include "content/common/gpu/gpu_channel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "content/common/gpu/gpu_channel.h"
 #include "content/common/gpu/gpu_memory_buffer_factory.h"
 #include "content/common/gpu/gpu_memory_manager.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/sync_point_manager.h"
 #include "content/common/message_router.h"
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/command_buffer/service/mailbox_manager_impl.h"
 #include "gpu/command_buffer/service/memory_program_cache.h"
 #include "gpu/command_buffer/service/shader_translator_cache.h"
 #include "ipc/message_filter.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_share_group.h"
+#if defined(USE_OZONE)
+#include "ui/ozone/public/gpu_platform_support.h"
+#include "ui/ozone/public/ozone_platform.h"
+#endif
 
 namespace content {
 
 namespace {
 
 class GpuChannelManagerMessageFilter : public IPC::MessageFilter {
  public:
   GpuChannelManagerMessageFilter(
       GpuMemoryBufferFactory* gpu_memory_buffer_factory)
       : sender_(NULL), gpu_memory_buffer_factory_(gpu_memory_buffer_factory) {}
@@ skipping 122 matching lines @@
 
 bool GpuChannelManager::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuChannelManager, msg)
     IPC_MESSAGE_HANDLER(GpuMsg_EstablishChannel, OnEstablishChannel)
     IPC_MESSAGE_HANDLER(GpuMsg_CloseChannel, OnCloseChannel)
     IPC_MESSAGE_HANDLER(GpuMsg_CreateViewCommandBuffer,
                         OnCreateViewCommandBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_DestroyGpuMemoryBuffer, OnDestroyGpuMemoryBuffer)
     IPC_MESSAGE_HANDLER(GpuMsg_LoadedShader, OnLoadedShader)
+    IPC_MESSAGE_HANDLER(GpuMsg_RelinquishResources, OnRelinquishResources)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 bool GpuChannelManager::Send(IPC::Message* msg) { return router_->Send(msg); }
 
 void GpuChannelManager::OnEstablishChannel(int client_id,
                                            bool share_context,
                                            bool allow_future_sync_points) {
@@ skipping 141 matching lines @@
 }
 
 gfx::GLSurface* GpuChannelManager::GetDefaultOffscreenSurface() {
   if (!default_offscreen_surface_.get()) {
     default_offscreen_surface_ =
         gfx::GLSurface::CreateOffscreenGLSurface(gfx::Size());
   }
   return default_offscreen_surface_.get();
 }
 
+void GpuChannelManager::OnRelinquishResources() {
+  if (default_offscreen_surface_.get()) {
+    default_offscreen_surface_->Destroy();
+    default_offscreen_surface_ = NULL;
+  }
+#if defined(USE_OZONE)
+  ui::OzonePlatform::GetInstance()->GetGpuPlatformSupport()->
+      RelinquishGpuResources(base::Bind(
+         &GpuChannelManager::OnResourcesReliuquished, base::Unretained(this)));

[piman, 2014/11/20 21:06:43]

Is Unretained safe?
If it is, can you document why?

[GusFernandez, 2014/11/20 21:42:48]

Used the safer weak_factory_.GetWeakPtr() instead.

+#else
+  OnResourcesReliuquished();

[piman, 2014/11/20 21:06:43]

typo: Reliuquished -> Relinquished

[GusFernandez, 2014/11/20 21:42:48]

Done.

+#endif
+}
+
+void GpuChannelManager::OnResourcesReliuquished() {
+  Send(new GpuHostMsg_ResourcesRelinquished());
+}
+
 }  // namespace content