[Remoting] OpenGL Rendering Layer

remoting/client/gl_desktop.h

+// Copyright 2016 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 REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_
+#define REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_
+
+#include <memory>
+
+#include "base/macros.h"
+
+namespace webrtc {
+class DesktopFrame;
+class DesktopRegion;
+}  // namespace webrtc
+
+namespace remoting {
+
+class GlCanvas;
+class GlRenderLayer;
+
+// This class draws the desktop on the canvas.
+class GlDesktop {
+ public:
+  GlDesktop();
+  virtual ~GlDesktop();
+
+  void SetVideoFrame(std::unique_ptr<webrtc::DesktopFrame> frame);
+
+  // Sets the canvas on which the desktop will be drawn. Resumes the current
+  // state of the desktop to the context of the new canvas.
+  // If |canvas| is nullptr, nothing will happen when calling Draw().
+  void SetCanvas(GlCanvas* canvas);
+
+  // Draws the desktop on the canvas.
+  void Draw();
+
+ private:
+  std::unique_ptr<GlRenderLayer> layer_;
+  std::unique_ptr<webrtc::DesktopFrame> last_frame_;
+
+  DISALLOW_COPY_AND_ASSIGN(GlDesktop);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_CLIENT_OPENGL_GL_DESKTOP_H_