1 /*
2  *  Copyright 2018 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #import <Foundation/Foundation.h>
12 
13 // RTCDisplayLinkTimer wraps a CADisplayLink and is set to fire every two screen
14 // refreshes, which should be 30fps. We wrap the display link in order to avoid
15 // a retain cycle since CADisplayLink takes a strong reference onto its target.
16 // The timer is paused by default.
17 @interface RTCDisplayLinkTimer : NSObject
18 
19 @property(nonatomic) BOOL isPaused;
20 
21 - (instancetype)initWithTimerHandler:(void (^)(void))timerHandler;
22 - (void)invalidate;
23 
24 @end
25