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// Copyright 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_RENDERER_FRAME_MANAGER_H_
#define CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_
#include <list>
#include <map>
#include "base/basictypes.h"
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/singleton.h"
#include "content/common/content_export.h"
namespace content {
class RenderWidgetHostViewAuraTest;
class CONTENT_EXPORT RendererFrameManagerClient {
public:
virtual ~RendererFrameManagerClient() {}
virtual void EvictCurrentFrame() = 0;
};
// This class is responsible for globally managing which renderers keep their
// compositor frame when offscreen. We actively discard compositor frames for
// offscreen tabs, but keep a minimum amount, as an LRU cache, to make switching
// between a small set of tabs faster. The limit is a soft limit, because
// clients can lock their frame to prevent it from being discarded, e.g. if the
// tab is visible, or while capturing a screenshot.
class CONTENT_EXPORT RendererFrameManager {
public:
static RendererFrameManager* GetInstance();
void AddFrame(RendererFrameManagerClient*, bool locked);
void RemoveFrame(RendererFrameManagerClient*);
void LockFrame(RendererFrameManagerClient*);
void UnlockFrame(RendererFrameManagerClient*);
size_t GetMaxNumberOfSavedFrames() const;
// For testing only
void set_max_number_of_saved_frames(size_t max_number_of_saved_frames) {
max_number_of_saved_frames_ = max_number_of_saved_frames;
}
void set_max_handles(float max_handles) { max_handles_ = max_handles; }
private:
// Please remove when crbug.com/443824 has been fixed.
friend class RenderWidgetHostViewAuraTest;
RendererFrameManager();
~RendererFrameManager();
void CullUnlockedFrames(size_t saved_frame_limit);
// React on memory pressure events to adjust the number of cached frames.
void OnMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
friend struct DefaultSingletonTraits<RendererFrameManager>;
// Listens for system under pressure notifications and adjusts number of
// cached frames accordingly.
base::MemoryPressureListener memory_pressure_listener_;
std::map<RendererFrameManagerClient*, size_t> locked_frames_;
std::list<RendererFrameManagerClient*> unlocked_frames_;
size_t max_number_of_saved_frames_;
float max_handles_;
DISALLOW_COPY_AND_ASSIGN(RendererFrameManager);
};
} // namespace content
#endif // CONTENT_BROWSER_RENDERER_HOST_RENDERER_FRAME_MANAGER_H_