Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
package org.mozilla.gecko.gfx;
import android.os.Handler;
import android.os.Looper;
import android.view.Choreographer;
import org.mozilla.gecko.annotation.WrapForJNI;
import org.mozilla.gecko.mozglue.JNIObject;
/** This class receives HW vsync events through a {@link Choreographer}. */
@WrapForJNI
/* package */ final class AndroidVsync extends JNIObject implements Choreographer.FrameCallback {
@WrapForJNI
@Override // JNIObject
protected native void disposeNative();
private static final String LOGTAG = "AndroidVsync";
/* package */ Choreographer mChoreographer;
private volatile boolean mObservingVsync;
public AndroidVsync() {
final Handler mainHandler = new Handler(Looper.getMainLooper());
mainHandler.post(
new Runnable() {
@Override
public void run() {
mChoreographer = Choreographer.getInstance();
if (mObservingVsync) {
mChoreographer.postFrameCallback(AndroidVsync.this);
}
}
});
}
@WrapForJNI(stubName = "NotifyVsync")
private native void nativeNotifyVsync(final long frameTimeNanos);
// Choreographer callback implementation.
public void doFrame(final long frameTimeNanos) {
if (mObservingVsync) {
mChoreographer.postFrameCallback(this);
nativeNotifyVsync(frameTimeNanos);
}
}
/**
* Start/stop observing Vsync event.
*
* @param enable true to start observing; false to stop.
* @return true if observing and false if not.
*/
@WrapForJNI
public synchronized boolean observeVsync(final boolean enable) {
if (mObservingVsync != enable) {
mObservingVsync = enable;
if (mChoreographer != null) {
if (enable) {
mChoreographer.postFrameCallback(this);
} else {
mChoreographer.removeFrameCallback(this);
}
}
}
return mObservingVsync;
}
}