blob: 302980d3df8a882de8b12d84cc9ce90e149101c2 [file] [log] [blame]
// 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 UI_GL_SYNC_CONTROL_VSYNC_PROVIDER_H_
#define UI_GL_SYNC_CONTROL_VSYNC_PROVIDER_H_
#include <queue>
#include "ui/gfx/vsync_provider.h"
namespace gfx {
// Base class for providers based on extensions like GLX_OML_sync_control and
// EGL_CHROMIUM_sync_control.
class SyncControlVSyncProvider : public VSyncProvider {
public:
SyncControlVSyncProvider();
~SyncControlVSyncProvider() override;
void GetVSyncParameters(const UpdateVSyncCallback& callback) override;
protected:
virtual bool GetSyncValues(int64* system_time,
int64* media_stream_counter,
int64* swap_buffer_counter) = 0;
virtual bool GetMscRate(int32* numerator, int32* denominator) = 0;
private:
base::TimeTicks last_timebase_;
uint64 last_media_stream_counter_;
base::TimeDelta last_good_interval_;
bool invalid_msc_;
// A short history of the last few computed intervals.
// We use this to filter out the noise in the computation resulting
// from configuration change (monitor reconfiguration, moving windows
// between monitors, suspend and resume, etc.).
std::queue<base::TimeDelta> last_computed_intervals_;
DISALLOW_COPY_AND_ASSIGN(SyncControlVSyncProvider);
};
} // namespace gfx
#endif // UI_GL_SYNC_CONTROL_VSYNC_PROVIDER_H_