Add NDK Choreographer API headers

/*

 * Copyright (C) 2015 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/**

 * @addtogroup Choreographer

 * @{

 */

/**

 * @file choreographer.h

 */

#ifndef ANDROID_CHOREOGRAPHER_H

#define ANDROID_CHOREOGRAPHER_H

__BEGIN_DECLS

struct AChoreographer;

typedef struct AChoreographer AChoreographer;

/**

 * Prototype of the function that is called when a new frame is being rendered.

 * It's passed the time that the frame is being rendered as nanoseconds in the

 * CLOCK_MONOTONIC time base, as well as the data pointer provided by the

 * application that registered a callback. All callbacks that run as part of

 * rendering a frame will observe the same frame time, so it should be used

 * whenever events need to be synchronized (e.g. animations).

 */

typedef void (*AChoreographer_frameCallback)(long frameTimeNanos, void* data);

/**

 * Get the AChoreographer instance for the current thread. This must be called

 * on an ALooper thread.

 */

AChoreographer* AChoreographer_getInstance();

/**

 * Post a callback to be run on the next frame. The data pointer provided will

 * be passed to the callback function when it's called.

 */

void AChoreographer_postFrameCallback(AChoreographer* choreographer,

                AChoreographer_frameCallback callback, void* data);

/**

 * Post a callback to be run on the frame following the specified delay. The

 * data pointer provided will be passed to the callback function when it's

 * called.

 */

void AChoreographer_postFrameCallbackDelayed(AChoreographer* choreographer,

                AChoreographer_frameCallback callback, void* data, long delayMillis);

__END_DECLS

#endif // ANDROID_CHOREOGRAPHER_H

/** @} */