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

content/common/gpu/image_transport_surface.cc

Index: content/common/gpu/image_transport_surface.cc
===================================================================
--- content/common/gpu/image_transport_surface.cc	(revision 108480)
+++ content/common/gpu/image_transport_surface.cc	(working copy)
@@ -13,6 +13,12 @@
 #include "content/common/gpu/gpu_messages.h"
 #include "gpu/command_buffer/service/gpu_scheduler.h"
 
+ImageTransportSurface::ImageTransportSurface() {
+}
+
+ImageTransportSurface::~ImageTransportSurface() {
+}
+
 ImageTransportHelper::ImageTransportHelper(ImageTransportSurface* surface,
                                            GpuChannelManager* manager,
                                            int32 render_view_id,
@@ -55,6 +61,7 @@
                         OnBuffersSwappedACK)
     IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_NewACK,
                         OnNewSurfaceACK)
+    IPC_MESSAGE_HANDLER(AcceleratedSurfaceMsg_ResizeViewACK, OnResizeViewACK);
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -90,6 +97,13 @@
   manager_->Send(new GpuHostMsg_AcceleratedSurfaceBuffersSwapped(params));
 }
 
+void ImageTransportHelper::SendResizeView(const gfx::Size& size) {
+  manager_->Send(new GpuHostMsg_ResizeView(renderer_id_,
+                                           render_view_id_,
+                                           route_id_,
+                                           size));
+}
+
 void ImageTransportHelper::SetScheduled(bool is_scheduled) {
   gpu::GpuScheduler* scheduler = Scheduler();
   if (!scheduler)
@@ -98,6 +112,13 @@
   scheduler->SetScheduled(is_scheduled);
 }
 
+void ImageTransportHelper::DeferToFence(base::Closure task) {
+  gpu::GpuScheduler* scheduler = Scheduler();
+  DCHECK(scheduler);
+
+  scheduler->DeferToFence(task);
+}
+
 void ImageTransportHelper::OnBuffersSwappedACK() {
   surface_->OnBuffersSwappedACK();
 }
@@ -108,10 +129,40 @@
   surface_->OnNewSurfaceACK(surface_id, shm_handle);
 }
 
+void ImageTransportHelper::OnResizeViewACK() {
+  surface_->OnResizeViewACK();
+}
+
 void ImageTransportHelper::Resize(gfx::Size size) {
+  // On windows, the surface is recreated and, in case the newly allocated
+  // surface happens to have the same address, it should be invalidated on the
+  // decoder so that future calls to MakeCurrent do not early out on the
+  // assumption that neither the context or surface have actually changed.
+#if defined(OS_WIN)
+  Decoder()->ReleaseCurrent();
+#endif
+
   surface_->OnResize(size);
+
+#if defined(OS_WIN)
+  Decoder()->MakeCurrent();
+  SetSwapInterval();
+#endif
 }
 
+void ImageTransportHelper::SetSwapInterval() {
+  GpuChannel* channel = manager_->LookupChannel(renderer_id_);
+  if (!channel)
+    return;
+
+  GpuCommandBufferStub* stub =
+      channel->LookupCommandBuffer(command_buffer_id_);
+  if (!stub)
+    return;
+
+  stub->SetSwapInterval();
+}
+
 bool ImageTransportHelper::MakeCurrent() {
   gpu::gles2::GLES2Decoder* decoder = Decoder();
   if (!decoder)
@@ -145,4 +196,47 @@
   return stub->decoder();
 }
 
+PassThroughImageTransportSurface::PassThroughImageTransportSurface(
+    GpuChannelManager* manager,
+    int32 render_view_id,
+    int32 renderer_id,
+    int32 command_buffer_id,
+    gfx::GLSurface* surface) : GLSurfaceAdapter(surface) {
+  helper_.reset(new ImageTransportHelper(this,
+                                         manager,
+                                         render_view_id,
+                                         renderer_id,
+                                         command_buffer_id,
+                                         gfx::kNullPluginWindow));
+}
+
+PassThroughImageTransportSurface::~PassThroughImageTransportSurface() {
+}
+
+bool PassThroughImageTransportSurface::Initialize() {
+  // The surface is assumed to have already been initialized.
+  return helper_->Initialize();
+}
+
+void PassThroughImageTransportSurface::Destroy() {
+  helper_->Destroy();
+  GLSurfaceAdapter::Destroy();
+}
+
+void PassThroughImageTransportSurface::OnNewSurfaceACK(
+    uint64 surface_id, TransportDIB::Handle surface_handle) {
+}
+
+void PassThroughImageTransportSurface::OnBuffersSwappedACK() {
+}
+
+void PassThroughImageTransportSurface::OnResizeViewACK() {
+  helper_->SetScheduled(true);
+}
+
+void PassThroughImageTransportSurface::OnResize(gfx::Size size) {
+  helper_->SendResizeView(size);
+  helper_->SetScheduled(false);
+}
+
 #endif  // defined(ENABLE_GPU)