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- void doFrame(long frameTimeNanos, int frame) {
- final long startNanos;
- synchronized (mLock) {
- if (!mFrameScheduled) {
- return; // no work to do
- }
- if (DEBUG_JANK && mDebugPrintNextFrameTimeDelta) {
- mDebugPrintNextFrameTimeDelta = false;
- Log.d(TAG, "Frame time delta: "
- + ((frameTimeNanos - mLastFrameTimeNanos) * 0.000001f) + " ms");
- }
- long intendedFrameTimeNanos = frameTimeNanos;
- startNanos = System.nanoTime();
- final long jitterNanos = startNanos - frameTimeNanos;
- if (jitterNanos >= mFrameIntervalNanos) {
- final long skippedFrames = jitterNanos / mFrameIntervalNanos;
- if (skippedFrames >= SKIPPED_FRAME_WARNING_LIMIT) {
- Log.i(TAG, "Skipped " + skippedFrames + " frames! "
- + "The application may be doing too much work on its main thread.");
- }
- final long lastFrameOffset = jitterNanos % mFrameIntervalNanos;
- if (DEBUG_JANK) {
- Log.d(TAG, "Missed vsync by " + (jitterNanos * 0.000001f) + " ms "
- + "which is more than the frame interval of "
- + (mFrameIntervalNanos * 0.000001f) + " ms! "
- + "Skipping " + skippedFrames + " frames and setting frame "
- + "time to " + (lastFrameOffset * 0.000001f) + " ms in the past.");
- }
- frameTimeNanos = startNanos - lastFrameOffset;
- }
- if (frameTimeNanos < mLastFrameTimeNanos) {
- if (DEBUG_JANK) {
- Log.d(TAG, "Frame time appears to be going backwards. May be due to a "
- + "previously skipped frame. Waiting for next vsync.");
- }
- scheduleVsyncLocked();
- return;
- }
- mFrameInfo.setVsync(intendedFrameTimeNanos, frameTimeNanos);
- mFrameScheduled = false;
- mLastFrameTimeNanos = frameTimeNanos;
- }
- try {
- Trace.traceBegin(Trace.TRACE_TAG_VIEW, "Choreographer#doFrame");
- AnimationUtils.lockAnimationClock(frameTimeNanos / TimeUtils.NANOS_PER_MS);
- mFrameInfo.markInputHandlingStart();
- doCallbacks(Choreographer.CALLBACK_INPUT, frameTimeNanos);
- mFrameInfo.markAnimationsStart();
- doCallbacks(Choreographer.CALLBACK_ANIMATION, frameTimeNanos);
- mFrameInfo.markPerformTraversalsStart();
- doCallbacks(Choreographer.CALLBACK_TRAVERSAL, frameTimeNanos);
- doCallbacks(Choreographer.CALLBACK_COMMIT, frameTimeNanos);
- } finally {
- AnimationUtils.unlockAnimationClock();
- Trace.traceEnd(Trace.TRACE_TAG_VIEW);
- }
- if (DEBUG_FRAMES) {
- final long endNanos = System.nanoTime();
- Log.d(TAG, "Frame " + frame + ": Finished, took "
- + (endNanos - startNanos) * 0.000001f + " ms, latency "
- + (startNanos - frameTimeNanos) * 0.000001f + " ms.");
- }
- }
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