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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GL_GPU_SWITCHING_MANAGER_H_
#define UI_GL_GPU_SWITCHING_MANAGER_H_
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "build/build_config.h"
#include "ui/gl/gl_export.h"
#include "ui/gl/gpu_preference.h"
#include "ui/gl/gpu_switching_observer.h"
namespace ui {
// GpuSwitchingManager is not thread safe. It is running on the browser main
// thread in the browser and/or on the gpu main thread in the GPU process.
class GL_EXPORT GpuSwitchingManager {
public:
// Getter for the singleton. This will return NULL on failure.
static GpuSwitchingManager* GetInstance();
GpuSwitchingManager(const GpuSwitchingManager&) = delete;
GpuSwitchingManager& operator=(const GpuSwitchingManager&) = delete;
void AddObserver(GpuSwitchingObserver* observer);
void RemoveObserver(GpuSwitchingObserver* observer);
// Called when a GPU switch is noticed by the system. In the browser process
// this is occurs as a result of a system observer. In the GPU process, this
// occurs as a result of an IPC from the browser. The system observer is kept
// in the browser process only so that any workarounds or blocklisting can
// be applied there.
//
// The GpuPreference argument is a heuristic indicating whether the
// system is known to be on the low-power or high-performance GPU.
// If this heuristic fails, then kDefault is passed as argument.
// Only Mac is supported for now.
void NotifyGpuSwitched(gl::GpuPreference active_gpu_heuristic);
// Called when a monitor is plugged in. Only Windows is supported for now.
void NotifyDisplayAdded();
// Called when a monitor is unplugged. Only Windows is supported for now.
void NotifyDisplayRemoved();
// Called when the display metrics changed. Only Windows is supported for
// now.
void NotifyDisplayMetricsChanged();
private:
friend struct base::DefaultSingletonTraits<GpuSwitchingManager>;
GpuSwitchingManager();
virtual ~GpuSwitchingManager();
base::ObserverList<GpuSwitchingObserver>::Unchecked observer_list_;
};
} // namespace ui
#endif // UI_GL_GPU_SWITCHING_MANAGER_H_
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