// 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 CHROME_BROWSER_GPU_FEATURE_CHECKER_H_
#define CHROME_BROWSER_GPU_FEATURE_CHECKER_H_

#include "base/callback.h"
#include "content/public/browser/gpu_data_manager_observer.h"
#include "content/public/common/gpu_feature_type.h"
#include "base/memory/ref_counted.h"

namespace content {
class GpuDataManager;
}  // namespace content

class GPUFeatureChecker : public base::RefCountedThreadSafe<GPUFeatureChecker>,
                          public content::GpuDataManagerObserver {
 public:
  typedef base::Callback<void(bool feature_available)> FeatureAvailableCallback;

  GPUFeatureChecker(content::GpuFeatureType feature,
                    FeatureAvailableCallback callback);

  // Check to see if |feature_| is available on the current GPU. |callback_|
  // will be called to indicate the availability of the feature. Must be called
  // from the the UI thread.
  void CheckGPUFeatureAvailability();

  // content::GpuDataManagerObserver
  virtual void OnGpuInfoUpdate() OVERRIDE;
  virtual void OnVideoMemoryUsageStatsUpdate(
      const content::GPUVideoMemoryUsageStats& video_memory_usage_stats)
          OVERRIDE {}
 private:
  friend class base::RefCountedThreadSafe<GPUFeatureChecker>;

  virtual ~GPUFeatureChecker();

  content::GpuFeatureType feature_;
  FeatureAvailableCallback callback_;

  DISALLOW_COPY_AND_ASSIGN(GPUFeatureChecker);
};

#endif  // CHROME_BROWSER_GPU_FEATURE_CHECKER_H_