1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include <android/choreographer.h> 20 21 // Declare the types, even if we can't access the functions. 22 #if __ANDROID_API__ < 24 23 24 struct AChoreographer; 25 typedef struct AChoreographer AChoreographer; 26 27 /** 28 * Prototype of the function that is called when a new frame is being rendered. 29 * It's passed the time that the frame is being rendered as nanoseconds in the 30 * CLOCK_MONOTONIC time base, as well as the data pointer provided by the 31 * application that registered a callback. All callbacks that run as part of 32 * rendering a frame will observe the same frame time, so it should be used 33 * whenever events need to be synchronized (e.g. animations). 34 */ 35 typedef void (*AChoreographer_frameCallback)(long frameTimeNanos, void* data); 36 37 #endif 38