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

ui/gfx/gl/gl_surface.h

 // 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.
 
 #ifndef UI_GFX_GL_GL_SURFACE_H_
 #define UI_GFX_GL_GL_SURFACE_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "build/build_config.h"
@@ skipping 13 matching lines @@
 
   // (Re)create the surface. TODO(apatrick): This is an ugly hack to allow the
   // EGL surface associated to be recreated without destroying the associated
   // context. The implementation of this function for other GLSurface derived
   // classes is in a pending changelist.
   virtual bool Initialize();
 
   // Destroys the surface.
   virtual void Destroy() = 0;
 
+  virtual bool Resize(const gfx::Size& size);
+
   // Returns true if this surface is offscreen.
   virtual bool IsOffscreen() = 0;
 
   // Swaps front and back buffers. This has no effect for off-screen
   // contexts.
   virtual bool SwapBuffers() = 0;
 
   // Get the size of the surface.
   virtual gfx::Size GetSize() = 0;
 
   // Get the underlying platform specific surface "handle".
   virtual void* GetHandle() = 0;
 
   // Returns the internal frame buffer object name if the surface is backed by
   // FBO. Otherwise returns 0.
   virtual unsigned int GetBackingFrameBufferObject();
 
   static bool InitializeOneOff();
 
   // Called after a context is made current with this surface. Returns false
   // on error.
   virtual bool OnMakeCurrent(GLContext* context);
 
+  // This gives a hint as to whether this surface is visible. If it is not
+  // visible, the backing store need not be preserved.
   virtual void SetVisible(bool visible);
 
+  // Get a handle used to share the surface with another process. Returns null
+  // if this is not possible.
+  virtual void* GetShareHandle();
+
+  // Get the platform specific display on which this surface resides, if
+  // available.
+  virtual void* GetDisplay();
+
+  // Get the platfrom specific configuration for this surface, if available.
+  virtual void* GetConfig();
+
+  // Get the GL pixel format of the surface, if available.
+  virtual unsigned GetFormat();
+
   // Create a GL surface that renders directly to a view.
   static scoped_refptr<GLSurface> CreateViewGLSurface(
       bool software,
       gfx::PluginWindowHandle window);
 
   // Create a GL surface used for offscreen rendering.
   static scoped_refptr<GLSurface> CreateOffscreenGLSurface(
       bool software,
       const gfx::Size& size);
 
   static GLSurface* GetCurrent();
 
  protected:
   virtual ~GLSurface();
   static void SetCurrent(GLSurface* surface);
 
  private:
   friend class base::RefCounted<GLSurface>;
   friend class GLContext;
   DISALLOW_COPY_AND_ASSIGN(GLSurface);
 };
 
+// Implementation of GLSurface that forwards all calls through to another
+// GLSurface.
+class GL_EXPORT GLSurfaceAdapter : public GLSurface {
+ public:
+  explicit GLSurfaceAdapter(GLSurface* surface);
+  virtual ~GLSurfaceAdapter();
+
+  virtual bool Initialize();
+  virtual void Destroy();
+  virtual bool Resize(const gfx::Size& size);
+  virtual bool IsOffscreen();
+  virtual bool SwapBuffers();
+  virtual gfx::Size GetSize();
+  virtual void* GetHandle();
+  virtual unsigned int GetBackingFrameBufferObject();
+  virtual bool OnMakeCurrent(GLContext* context);
+  virtual void* GetShareHandle();
+  virtual void* GetDisplay();
+  virtual void* GetConfig();
+  virtual unsigned GetFormat();
+
+  GLSurface* surface() const { return surface_.get(); }
+
+ private:
+  scoped_refptr<GLSurface> surface_;
+  DISALLOW_COPY_AND_ASSIGN(GLSurfaceAdapter);
+};
+
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_H_