Draw the offscreen texture to reflector's surface without extra copy

content/browser/compositor/reflector_texture.h

+// Copyright 2015 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_BROWSER_COMPOSITOR_REFLECTOR_TEXTURE_H_
+#define CONTENT_BROWSER_COMPOSITOR_REFLECTOR_TEXTURE_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/compositor/owned_mailbox.h"
+#include "content/common/content_export.h"
+
+namespace cc {
+class ContextProvider;
+}
+
+namespace gfx {
+class Rect;
+class Size;
+}
+
+namespace content {
+class GLHelper;
+
+// Create and manages texture mailbox to be used by Reflector.
+class CONTENT_EXPORT ReflectorTexture {
+ public:
+  explicit ReflectorTexture(cc::ContextProvider* provider);
+  ~ReflectorTexture();
+
+  void CopyTextureFullImage(const gfx::Size& size);
+  void CopyTextureSubImage(const gfx::Rect& size);
+
+  uint32 texture_id() const { return texture_id_; }
+  scoped_refptr<OwnedMailbox> mailbox() { return mailbox_; }
+
+ private:
+  scoped_refptr<OwnedMailbox> mailbox_;
+  scoped_ptr<GLHelper> gl_helper_;
+  uint32 texture_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(ReflectorTexture);
+};
+
+}  // namespace content
+
+#endif