Simplify IOSurface CoreAnimation code: Part 2

content/browser/renderer_host/compositing_iosurface_context_mac.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_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
-#define CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_
-
-#import <AppKit/NSOpenGL.h>
-#include <OpenGL/OpenGL.h>
-#include <map>
-
-#include "base/basictypes.h"
-#include "base/lazy_instance.h"
-#include "base/mac/scoped_nsobject.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/public/browser/gpu_data_manager_observer.h"
-#include "ui/gl/scoped_cgl.h"
-
-namespace content {
-
-class CompositingIOSurfaceContext
-    : public base::RefCounted<CompositingIOSurfaceContext>,
-      public content::GpuDataManagerObserver {
- public:
-  enum {
-    // The number used to look up the context used for async readback and for
-    // initializing the IOSurface.
-    kOffscreenContextWindowNumber = -2,
-    // The number used to look up the context used by CAOpenGLLayers.
-    kCALayerContextWindowNumber = -3,
-  };
-
-  // Get or create a GL context for the specified window with the specified
-  // surface ordering. Share these GL contexts as much as possible because
-  // creating and destroying them can be expensive
-  // http://crbug.com/180463
-  static scoped_refptr<CompositingIOSurfaceContext> Get(int window_number);
-
-  // Mark that all the GL contexts in the same sharegroup as this context as
-  // invalid, so they shouldn't be returned anymore by Get, but rather, new
-  // contexts should be created. This is called as a precaution when unexpected
-  // GL errors occur.
-  void PoisonContextAndSharegroup();
-  bool HasBeenPoisoned() const { return poisoned_; }
-
-  CGLContextObj cgl_context() const { return cgl_context_; }
-  int window_number() const { return window_number_; }
-
-  // content::GpuDataManagerObserver implementation.
-  virtual void OnGpuSwitching() OVERRIDE;
-
- private:
-  friend class base::RefCounted<CompositingIOSurfaceContext>;
-
-  CompositingIOSurfaceContext(
-      int window_number,
-      base::ScopedTypeRef<CGLContextObj> clg_context_strong,
-      CGLContextObj clg_context);
-  virtual ~CompositingIOSurfaceContext();
-
-  int window_number_;
-  base::ScopedTypeRef<CGLContextObj> cgl_context_strong_;
-  // Weak, backed by |cgl_context_strong_|.
-  CGLContextObj cgl_context_;
-
-  bool poisoned_;
-
-  // The global map from window number and window ordering to
-  // context data.
-  typedef std::map<int, CompositingIOSurfaceContext*> WindowMap;
-  static base::LazyInstance<WindowMap> window_map_;
-  static WindowMap* window_map();
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_COMPOSITING_IOSURFACE_CONTEXT_MAC_H_