Allow the renderer process to map textures from one context into another.

content/common/gpu/gpu_command_buffer_stub.cc

 // Copyright (c) 2011 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.
 
 #if defined(ENABLE_GPU)
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/process_util.h"
 #include "base/shared_memory.h"
@@ skipping 55 matching lines @@
       handle_, renderer_id_, render_view_id_));
 }
 
 bool GpuCommandBufferStub::OnMessageReceived(const IPC::Message& message) {
   // Always use IPC_MESSAGE_HANDLER_DELAY_REPLY for synchronous message handlers
   // here. This is so the reply can be delayed if the scheduler is unscheduled.
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(GpuCommandBufferStub, message)
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Initialize,
                                     OnInitialize);
+    IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_MapExternalResource,
+                        OnMapExternalResource);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_SetParent,
                                     OnSetParent);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_GetState, OnGetState);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_Flush, OnFlush);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_AsyncFlush, OnAsyncFlush);
     IPC_MESSAGE_HANDLER(GpuCommandBufferMsg_Rescheduled, OnRescheduled);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_CreateTransferBuffer,
                                     OnCreateTransferBuffer);
     IPC_MESSAGE_HANDLER_DELAY_REPLY(GpuCommandBufferMsg_RegisterTransferBuffer,
                                     OnRegisterTransferBuffer);
@@ skipping 153 matching lines @@
     } else {
       OnInitializeFailed(reply_message);
       return;
     }
   }
 
   GpuCommandBufferMsg_Initialize::WriteReplyParams(reply_message, true);
   Send(reply_message);
 }
 
+

[jamesr, 2011/07/29 19:55:08]

nit: extra newline

+void GpuCommandBufferStub::OnMapExternalResource(
+    gpu::resource_type::ResourceType resource_type,
+    uint32 resource_source_id,
+    int32 source_route_id,
+    uint32 resource_dest_id) {
+  GpuCommandBufferStub* source_stub =
+      channel_->LookupCommandBuffer(source_route_id);
+
+  scheduler_->MapExternalResource(
+      resource_type,
+      resource_source_id,
+      source_stub ? source_stub->scheduler() : NULL,
+      resource_dest_id);
+}
+
 void GpuCommandBufferStub::OnSetParent(int32 parent_route_id,
                                        uint32 parent_texture_id,
                                        IPC::Message* reply_message) {
 
   GpuCommandBufferStub* parent_stub = NULL;
   if (parent_route_id != MSG_ROUTING_NONE) {
     parent_stub = channel_->LookupCommandBuffer(parent_route_id);
   }
 
   bool result = true;
@@ skipping 293 matching lines @@
       new GpuVideoDecodeAccelerator(this, route_id_, this));
   video_decoder_->Initialize(configs);
 }
 
 void GpuCommandBufferStub::OnDestroyVideoDecoder() {
   LOG(ERROR) << "GpuCommandBufferStub::OnDestroyVideoDecoder";
   video_decoder_.reset();
 }
 
 #endif  // defined(ENABLE_GPU)