Replace WGC3D visibility extension with resource_usage extension. [Part 2 of 3]

content/common/gpu/image_transport_surface_win.cc

 // Copyright (c) 2012 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"
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 22 matching lines @@
   PbufferImageTransportSurface(GpuChannelManager* manager,
                                GpuCommandBufferStub* stub);
 
   // 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 void SetVisible(bool visible) OVERRIDE;
+  virtual void SetResourceUsage(ResourceUsage resourceUsage) OVERRIDE;
 
  protected:
   // ImageTransportSurface implementation
   virtual void OnNewSurfaceACK(uint64 surface_handle,
                                TransportDIB::Handle shm_handle) OVERRIDE;
   virtual void OnBuffersSwappedACK() OVERRIDE;
   virtual void OnPostSubBufferACK() OVERRIDE;
   virtual void OnResizeViewACK() OVERRIDE;
   virtual void OnResize(gfx::Size size) OVERRIDE;
 
@@ skipping 60 matching lines @@
 
   return true;
 }
 
 bool PbufferImageTransportSurface::PostSubBuffer(
     int x, int y, int width, int height) {
   NOTREACHED();
   return false;
 }
 
-void PbufferImageTransportSurface::SetVisible(bool visible) {
-  if (visible == is_visible_)
-    return;
-
-  is_visible_ = visible;
-
-  if (visible)
-    Resize(visible_size_);
-  else
-    Resize(gfx::Size(1, 1));
+void PbufferImageTransportSurface::SetResourceUsage(
+    ResourceUsage resourceUsage) {
+  switch (resourceUsage) {
+    case RESOURCE_USAGE_FULL:
+      Resize(visible_size_);
+      is_visible_ = true;
+      break;
+    case RESOURCE_USAGE_LESS:
+      Resize(gfx::Size(1, 1));
+      is_visible_ = false;
+      break;
+    case RESOURCE_USAGE_NONE:
+      // TODO(mmocny): drop all the buffers
+      break;
+  }
 }
 
 std::string PbufferImageTransportSurface::GetExtensions() {
   std::string extensions = gfx::GLSurface::GetExtensions();
   extensions += extensions.empty() ? "" : " ";
   extensions += "GL_CHROMIUM_front_buffer_cached";
   return extensions;
 }
 
 void PbufferImageTransportSurface::SendBuffersSwapped() {
@@ skipping 60 matching lines @@
                                                    surface.get());
   }
 
   if (surface->Initialize())
     return surface;
   else
     return NULL;
 }
 
 #endif  // ENABLE_GPU