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content/common/gpu/media/gles2_external_texture_copier.h

+// Copyright (c) 2013 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_COMMON_GPU_MEDIA_GLES2_EXTERNAL_TEXTURE_COPIER_H_
+#define CONTENT_COMMON_GPU_MEDIA_GLES2_EXTERNAL_TEXTURE_COPIER_H_
+
+#include "base/basictypes.h"
+#include "ui/gl/gl_bindings.h"
+
+namespace content {
+
+// A utility class which copies the given external texture
+// (GL_TEXTURE_EXTERNAL_OES) to the target texture (GL_TEXTURE_2D) by using
+// framebuffer.
+// TODO(dwkang): consider using CopyTextureCHROMIUMResourceManager once it
+// supports GL_TEXTURE_EXTERNAL_OES.
+class Gles2ExternalTextureCopier {
+ public:
+  Gles2ExternalTextureCopier();
+  virtual ~Gles2ExternalTextureCopier();
+
+  bool Init(int32 width, int32 height);
+
+  bool Copy(GLuint source_texture_id, GLuint destination_texture_id,
+            const float transfrom_matrix[16]);
+
+ private:
+  bool SetupGraphics();
+  void RenderFrame(int32 width, int32 height, GLuint texture_id,

[Ami GONE FROM CHROMIUM, 2013/02/17 00:12:44]

This is a weird place to sort this function into, considering the previous one
and the following 3 are all part of Init ;)
I guess I'd just inline it into Copy().

[Ami GONE FROM CHROMIUM, 2013/02/17 00:12:44]

what does it mean if width/height here are different from Init()'s args?  Need
doco.

+                   const float transfrom_matrix[16]);
+  bool SetupFrameBuffer();
+
+  void SaveState();

[Ami GONE FROM CHROMIUM, 2013/02/17 00:12:44]

Replace with ScopedFrameBufferBinder / ScopedTextureBinder ?

+  void RestoreState();
+
+  bool initialized_;
+  int32 width_;
+  int32 height_;
+  GLuint framebuffer_id_;
+  GLuint renderbuffer_id_;
+  GLuint program_;
+  GLuint position_handle_;
+  GLuint st_matrix_handle_;
+  GLuint mvp_matrix_handle_;
+  GLuint texture_handle_;
+
+  GLuint previous_framebuffer_id_;
+  GLuint previous_renderbuffer_id_;
+  GLuint previous_texture_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(Gles2ExternalTextureCopier);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_MEDIA_GLES2_EXTERNAL_TEXTURE_COPIER_H_