Use shared D3D9 texture to transport the compositor's backing buffer to the browser...

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
===================================================================
--- content/browser/renderer_host/render_widget_host_view_win.cc	(revision 108480)
+++ content/browser/renderer_host/render_widget_host_view_win.cc	(working copy)
@@ -6,6 +6,7 @@
 
 #include <algorithm>
 
+#include "base/bind.h"
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/metrics/histogram.h"
@@ -19,11 +20,14 @@
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_state.h"
 #include "content/browser/accessibility/browser_accessibility_win.h"
+#include "content/browser/gpu/gpu_process_host.h"
+#include "content/browser/gpu/gpu_process_host_ui_shim.h"
 #include "content/browser/plugin_process_host.h"
 #include "content/browser/renderer_host/backing_store.h"
 #include "content/browser/renderer_host/backing_store_win.h"
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/browser/renderer_host/render_widget_host.h"
+#include "content/common/gpu/gpu_messages.h"
 #include "content/common/plugin_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_thread.h"
@@ -54,6 +58,8 @@
 #include "webkit/plugins/npapi/webplugin.h"
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
+#pragma comment(lib, "d3d9.lib")
+
 using base::TimeDelta;
 using base::TimeTicks;
 using content::BrowserThread;
@@ -203,6 +209,21 @@
   return ::DefWindowProc(window, message, wparam, lparam);
 }
 
+void SendToGpuProcessHost(int gpu_host_id, IPC::Message* message) {
+  GpuProcessHost* gpu_process_host = GpuProcessHost::FromID(gpu_host_id);
+  if (!gpu_process_host) {
+    delete message;
+    return;
+  }
+
+  gpu_process_host->Send(message);
+}
+
+void PostTaskOnIOThread(const tracked_objects::Location& from_here,
+                        base::Closure task) {
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE, task);
+}
+
 bool DecodeZoomGesture(HWND hwnd, const GESTUREINFO& gi,
                        content::PageZoom* zoom,
                        POINT* zoom_center) {
@@ -324,6 +345,9 @@
 RenderWidgetHostViewWin::~RenderWidgetHostViewWin() {
   UnlockMouse();
   ResetTooltip();
+
+  if (accelerated_surface_)
+    accelerated_surface_->Destroy();
 }
 
 void RenderWidgetHostViewWin::CreateWnd(HWND parent) {
@@ -1750,8 +1774,14 @@
 }
 
 void RenderWidgetHostViewWin::ScheduleComposite() {
-  if (render_widget_host_)
-    render_widget_host_->ScheduleComposite();
+  // If we have a previous frame then present it immediately. Otherwise request
+  // a new frame be composited.
+  if (accelerated_surface_.get()) {
+    accelerated_surface_->Present();
+  } else {
+    if (render_widget_host_)
+      render_widget_host_->ScheduleComposite();
+  }
 }
 
 // Creates a HWND within the RenderWidgetHostView that will serve as a host
@@ -1846,6 +1876,27 @@
   }
 }
 
+void RenderWidgetHostViewWin::AcceleratedSurfaceBuffersSwapped(
+    const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params,
+    int gpu_host_id) {
+  if (!accelerated_surface_.get() && compositor_host_window_) {
+    accelerated_surface_ = new AcceleratedSurface(compositor_host_window_);
+    accelerated_surface_->Initialize();
+  }
+
+  base::Closure acknowledge_task =
+      base::Bind(SendToGpuProcessHost,
+                 gpu_host_id,
+                 new AcceleratedSurfaceMsg_BuffersSwappedACK(params.route_id));
+
+  accelerated_surface_->AsyncPresentAndAcknowledge(
+      params.size,
+      params.surface_id,
+      base::Bind(PostTaskOnIOThread,
+                 FROM_HERE,
+                 acknowledge_task));
+}
+
 void RenderWidgetHostViewWin::SetAccessibilityFocus(int acc_obj_id) {
   if (!render_widget_host_)
     return;