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      1 // Copyright 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
      7 
      8 #include "content/browser/renderer_host/renderer_frame_manager.h"
      9 #include "content/common/content_export.h"
     10 
     11 namespace content {
     12 
     13 class CONTENT_EXPORT DelegatedFrameEvictorClient {
     14  public:
     15   virtual ~DelegatedFrameEvictorClient() {}
     16   virtual void EvictDelegatedFrame() = 0;
     17 };
     18 
     19 class CONTENT_EXPORT DelegatedFrameEvictor : public RendererFrameManagerClient {
     20  public:
     21   // |client| must outlive |this|.
     22   explicit DelegatedFrameEvictor(DelegatedFrameEvictorClient* client);
     23   virtual ~DelegatedFrameEvictor();
     24 
     25   void SwappedFrame(bool visible);
     26   void DiscardedFrame();
     27   void SetVisible(bool visible);
     28   void LockFrame();
     29   void UnlockFrame();
     30   bool HasFrame() { return has_frame_; }
     31 
     32  private:
     33   // RendererFrameManagerClient implementation.
     34   virtual void EvictCurrentFrame() OVERRIDE;
     35 
     36   DelegatedFrameEvictorClient* client_;
     37   bool has_frame_;
     38 
     39   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameEvictor);
     40 };
     41 
     42 }  // namespace content
     43 
     44 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
     45