Flag and adapter class for software compositing.

content/renderer/gpu/compositor_output_surface_software_gl_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_SURFACE_SOFTWARE_GL_ADAPTER_H_
+#define CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_SOFTWARE_GL_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/WebCompositorOutputSurfaceSoftware.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 CompositorOutputSurfaceSoftwareGLAdapter
+    : NON_EXPORTED_BASE(public WebKit::WebCompositorOutputSurfaceSoftware)
+    , NON_EXPORTED_BASE(public base::NonThreadSafe) {

[piman, 2012/08/28 23:26:59]

nit: style for base classes (comma goes to previous line)

+public:
+  CompositorOutputSurfaceSoftwareGLAdapter(
+      WebKit::WebGraphicsContext3D* context3d);
+  virtual ~CompositorOutputSurfaceSoftwareGLAdapter();
+
+  virtual WebKit::WebImage* lock() OVERRIDE;
+  virtual void unlockAndOutputFrame() OVERRIDE;
+
+  virtual void viewportChanged(const WebKit::WebSize& size) OVERRIDE;
+
+private:
+  void Initialize();
+  void Destroy();
+  void Resize(const gfx::Size& viewportSize);
+  void Draw(void* pixels);
+
+  bool initialized_;
+  int program_;
+  int vertex_shader_;
+  int fragment_shader_;
+  unsigned int vertex_buffer_;
+  unsigned framebuffer_texture_id_;
+  gfx::Size framebufferTextureSize_;

[piman, 2012/08/28 23:26:59]

nit: framebuffer_texture_size_

+
+  scoped_ptr<WebKit::WebGraphicsContext3D> context3d_;
+  scoped_ptr<SkDevice> device_;
+  WebKit::WebImage image_;
+};
+
+#endif  // CONTENT_RENDERER_GPU_COMPOSITOR_OUTPUT_SURFACE_SOFTWARE_GL_ADAPTER_H_