| // 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_GFX_VSYNC_PROVIDER_H_ |
| #define UI_GFX_VSYNC_PROVIDER_H_ |
| |
| #include "base/callback.h" |
| #include "base/time/time.h" |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| |
| class GFX_EXPORT VSyncProvider { |
| public: |
| virtual ~VSyncProvider() {} |
| |
| typedef base::Callback< |
| void(const base::TimeTicks timebase, const base::TimeDelta interval)> |
| UpdateVSyncCallback; |
| |
| // Get the time of the most recent screen refresh, along with the time |
| // between consecutive refreshes. The callback is called as soon as |
| // the data is available: it could be immediately from this method, |
| // later via a PostTask to the current MessageLoop, or never (if we have |
| // no data source). We provide the strong guarantee that the callback will |
| // not be called once the instance of this class is destroyed. |
| virtual void GetVSyncParameters(const UpdateVSyncCallback& callback) = 0; |
| }; |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_VSYNC_PROVIDER_H_ |