Flag and adapter class for software compositing.

content/renderer/gpu/compositor_output_canvas_3d_to_2d_adapter.h

+// 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.
+
+#ifndef CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_CANVAS_3D_TO_2D_ADAPTER_H_
+#define CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_CANVAS_3D_TO_2D_ADAPTER_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/non_thread_safe.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebImage.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebCompositorOutputCanvas2D.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
+#include "ui/gfx/size.h"
+
+// This class can be created only on the main thread, but then becomes pinned
+// to a fixed thread when bindToClient is called.
+class CompositorOutputCanvas3DTo2DAdapter
+    : NON_EXPORTED_BASE(public WebKit::WebCompositorOutputCanvas2D)
+    , NON_EXPORTED_BASE(public base::NonThreadSafe) {
+public:
+  CompositorOutputCanvas3DTo2DAdapter(WebKit::WebGraphicsContext3D* context3d);
+  virtual ~CompositorOutputCanvas3DTo2DAdapter();
+
+  virtual WebKit::WebImage* lock() OVERRIDE;
+  virtual void unlockAndOutputFrame() OVERRIDE;
+
+  virtual void viewportChanged(const WebKit::WebSize& size) OVERRIDE;
+
+private:
+  void initGLAdapter();

[piman, 2012/08/28 03:31:58]

nit: style. In Chrome, functions are CamelCase, fields are
lower_with_underscore_

For this one, maybe just name Initialize() ?

[aelias_OOO_until_Jul13, 2012/08/28 23:10:58]

Done.

+  void textureGLAdapter(const gfx::Size& viewportSize);

[piman, 2012/08/28 03:31:58]

I don't know what this function does from the name. name it Resize() ?

[aelias_OOO_until_Jul13, 2012/08/28 23:10:58]

Done.

+  void frameDrawGLAdapter(void* pixels);

[piman, 2012/08/28 03:31:58]

Draw() ?

[aelias_OOO_until_Jul13, 2012/08/28 23:10:58]

Done.

+
+  bool initialized_;
+  int program_;
+  int vertex_shader_;
+  int fragment_shader_;
+  int texture_uniform_;
+  unsigned int vertex_buffer_;
+  unsigned framebufferTextureId_;
+  gfx::Size framebufferTextureSize_;
+
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d_;
+  scoped_ptr<SkDevice> device_;
+  WebKit::WebImage image_;
+};
+
+#endif  // CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_CANVAS_3D_TO_2D_ADAPTER_H_