Plumb thru that we cache the front buffer.

content/common/gpu/image_transport_surface_linux.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 "content/common/gpu/image_transport_surface.h"
 
 // This conflicts with the defines in Xlib.h and must come first.
 #include "content/common/gpu/gpu_messages.h"
@@ skipping 44 matching lines @@
 // We are backed by an Pbuffer offscreen surface for the purposes of creating a
 // context, but use FBOs to render to X Pixmap backed EGLImages.
 class EGLImageTransportSurface : public ImageTransportSurface,
                                  public gfx::PbufferGLSurfaceEGL {
  public:
   EGLImageTransportSurface(GpuChannelManager* manager,
                            int32 render_view_id,
                            int32 renderer_id,
                            int32 command_buffer_id);
 
-  // GLSurface implementation
+  // gfx::GLSurface implementation
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual bool IsOffscreen() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
   virtual std::string GetExtensions() OVERRIDE;
   virtual gfx::Size GetSize() OVERRIDE;
   virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
   virtual unsigned int GetBackingFrameBufferObject() OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
@@ skipping 32 matching lines @@
   GLXImageTransportSurface(GpuChannelManager* manager,
                            int32 render_view_id,
                            int32 renderer_id,
                            int32 command_buffer_id);
 
   // gfx::GLSurface implementation:
   virtual bool Initialize() OVERRIDE;
   virtual void Destroy() OVERRIDE;
   virtual bool SwapBuffers() OVERRIDE;
   virtual bool PostSubBuffer(int x, int y, int width, int height) OVERRIDE;
+  virtual std::string GetExtensions();
   virtual gfx::Size GetSize() OVERRIDE;
   virtual bool OnMakeCurrent(gfx::GLContext* context) OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
 
  protected:
   // ImageTransportSurface implementation:
   virtual void OnNewSurfaceACK(
       uint64 surface_id, TransportDIB::Handle surface_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnPostSubBufferACK() OVERRIDE;
@@ skipping 119 matching lines @@
                                          gfx::kNullPluginWindow));
 }
 
 EGLImageTransportSurface::~EGLImageTransportSurface() {
   Destroy();
 }
 
 bool EGLImageTransportSurface::Initialize() {
   if (!helper_->Initialize())
     return false;
-  return PbufferGLSurfaceEGL::Initialize();
+  return gfx::PbufferGLSurfaceEGL::Initialize();
 }
 
 void EGLImageTransportSurface::Destroy() {
   if (back_surface_.get())
     ReleaseSurface(&back_surface_);
   if (front_surface_.get())
     ReleaseSurface(&front_surface_);
 
   helper_->Destroy();
-  PbufferGLSurfaceEGL::Destroy();
+  gfx::PbufferGLSurfaceEGL::Destroy();
 }
 
 // Make sure that buffer swaps occur for the surface, so we can send the data
 // to the actual onscreen surface in the browser
 bool EGLImageTransportSurface::IsOffscreen() {
   return false;
 }
 
 bool EGLImageTransportSurface::OnMakeCurrent(gfx::GLContext* context) {
   if (made_current_)
@@ skipping 93 matching lines @@
   return true;
 }
 
 bool EGLImageTransportSurface::PostSubBuffer(
     int x, int y, int width, int height) {
   NOTREACHED();
   return false;
 }
 
 std::string EGLImageTransportSurface::GetExtensions() {
-  return GLSurface::GetExtensions();
+  std::string extensions = gfx::GLSurface::GetExtensions();
+  extensions += extensions.empty() ? "" : " ";
+  extensions += "GL_CHROMIUM_front_buffer_cached";
+  return extensions;
 }
 
 gfx::Size EGLImageTransportSurface::GetSize() {
   return back_surface_->size();
 }
 
 void EGLImageTransportSurface::OnNewSurfaceACK(
     uint64 surface_id, TransportDIB::Handle /*surface_handle*/) {
   DCHECK_EQ(back_surface_->pixmap(), surface_id);
   helper_->SetScheduled(true);
@@ skipping 163 matching lines @@
   params.y = y;
   params.width = width;
   params.height = height;
 
   helper_->SendAcceleratedSurfacePostSubBuffer(params);
 
   helper_->SetScheduled(false);
   return true;
 }
 
+std::string GLXImageTransportSurface::GetExtensions() {
+  std::string extensions = gfx::NativeViewGLSurfaceGLX::GetExtensions();
+  extensions += extensions.empty() ? "" : " ";
+  extensions += "GL_CHROMIUM_front_buffer_cached";
+  return extensions;
+}
+
 gfx::Size GLXImageTransportSurface::GetSize() {
   return size_;
 }
 
 bool GLXImageTransportSurface::OnMakeCurrent(gfx::GLContext* context) {
   if (made_current_)
     return true;
 
   // Check for driver support.
   Display* dpy = static_cast<Display*>(GetDisplay());
@@ skipping 126 matching lines @@
   return true;
 }
 
 bool OSMesaImageTransportSurface::PostSubBuffer(
     int x, int y, int width, int height) {
   NOTREACHED();
   return false;
 }
 
 std::string OSMesaImageTransportSurface::GetExtensions() {
-  return GLSurface::GetExtensions();
+  std::string extensions = gfx::GLSurface::GetExtensions();
+  extensions += extensions.empty() ? "" : " ";
+  extensions += "GL_CHROMIUM_front_buffer_cached";
+  return extensions;
 }
 
 void OSMesaImageTransportSurface::OnBuffersSwappedACK() {
   helper_->SetScheduled(true);
 }
 
 void OSMesaImageTransportSurface::OnPostSubBufferACK() {
   NOTREACHED();
 }
 
@@ skipping 46 matching lines @@
                                                  command_buffer_id,
                                                  surface.get());
 #endif
   if (surface->Initialize())
     return surface;
   else
     return NULL;
 }
 
 #endif  // defined(USE_GPU)