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// Copyright (c) 2012 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 UI_GL_GPU_SWITCHING_MANAGER_H_
#define UI_GL_GPU_SWITCHING_MANAGER_H_
#include <vector>
#include "base/memory/singleton.h"
#include "base/observer_list.h"
#include "ui/gl/gl_export.h"
#include "ui/gl/gpu_preference.h"
#include "ui/gl/gpu_switching_observer.h"
namespace ui {
class GL_EXPORT GpuSwitchingManager {
public:
// Getter for the singleton. This will return NULL on failure.
static GpuSwitchingManager* GetInstance();
// Set the switching option to PreferIntegratedGpu.
void ForceUseOfIntegratedGpu();
// Set the switching option to PreferDiscreteGpu; switch to discrete GPU
// immediately on Mac where dual GPU switching is supported.
void ForceUseOfDiscreteGpu();
// If no GPU is forced, return the original GpuPreference; otherwise, return
// the forced GPU.
gfx::GpuPreference AdjustGpuPreference(gfx::GpuPreference gpu_preference);
// In the browser process, the value for this flag is computed the first time
// this function is called.
// In the GPU process, the value is passed from the browser process using the
// --supports-dual-gpus commandline switch.
bool SupportsDualGpus();
void SetGpuCount(size_t gpu_count);
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 blacklisting can
// be applied there.
void NotifyGpuSwitched();
private:
friend struct DefaultSingletonTraits<GpuSwitchingManager>;
GpuSwitchingManager();
virtual ~GpuSwitchingManager();
#if defined(OS_MACOSX)
void SwitchToDiscreteGpuMac();
#endif // OS_MACOSX
gfx::GpuPreference gpu_switching_option_;
bool gpu_switching_option_set_;
bool supports_dual_gpus_;
bool supports_dual_gpus_set_;
size_t gpu_count_;
struct PlatformSpecific;
scoped_ptr<PlatformSpecific> platform_specific_;
ObserverList<GpuSwitchingObserver> observer_list_;
DISALLOW_COPY_AND_ASSIGN(GpuSwitchingManager);
};
} // namespace ui
#endif // UI_GL_GPU_SWITCHING_MANAGER_H_
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