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34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef UI_GFX_VSYNC_PROVIDER_H_
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#define UI_GFX_VSYNC_PROVIDER_H_
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#include "base/callback.h"
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#include "base/time/time.h"
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#include "ui/gfx/gfx_export.h"
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namespace gfx {
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class GFX_EXPORT VSyncProvider {
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public:
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virtual ~VSyncProvider() {}
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typedef base::Callback<
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void(const base::TimeTicks timebase, const base::TimeDelta interval)>
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UpdateVSyncCallback;
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// Get the time of the most recent screen refresh, along with the time
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// between consecutive refreshes. The callback is called as soon as
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// the data is available: it could be immediately from this method,
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// later via a PostTask to the current MessageLoop, or never (if we have
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// no data source). We provide the strong guarantee that the callback will
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// not be called once the instance of this class is destroyed.
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virtual void GetVSyncParameters(const UpdateVSyncCallback& callback) = 0;
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};
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} // namespace gfx
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#endif // UI_GFX_VSYNC_PROVIDER_H_
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