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Commit 8df049f9 authored by Jian-Syuan (Shane) Wong's avatar Jian-Syuan (Shane) Wong
Browse files

Add a getter method for expectedPresentationTimeNanos 

Add a getter method for expectedPresentationTimeNanos since it offers a
more accurate frame time than frameTimeNanos

Bug: 283122385
Test: atest ChoreographerTest
Change-Id: If7494bada7696efae28fb5a45003abfca234c0ca
parent ec5e4ee6

core/api/test-current.txt

+2 −0
Original line number Diff line number Diff line
@@ -3415,7 +3415,9 @@ package android.view { 
  }



  public final class Choreographer {

    method public long getExpectedPresentationTimeNanos();

    method public static long getFrameDelay();

    method public long getFrameTimeNanos();

    method public void postCallback(int, Runnable, Object);

    method public void postCallbackDelayed(int, Runnable, Object, long);

    method public void removeCallbacks(int, Runnable, Object);

core/java/android/view/Choreographer.java

+22 −0
Original line number Diff line number Diff line
@@ -693,6 +693,7 @@ public final class Choreographer { 
     * @throws IllegalStateException if no frame is in progress.

     * @hide

     */

    @TestApi

    @UnsupportedAppUsage

    public long getFrameTimeNanos() {

        synchronized (mLock) {
@@ -716,6 +717,27 @@ public final class Choreographer { 
        }

    }



    /**

     * Gets the time in {@link System#nanoTime()} timebase which the current frame

     * is expected to be presented.

     * <p>

     * This time should be used to advance any animation clocks.

     * Prefer using this method over {@link #getFrameTimeNanos()}.

     * </p><p>

     * This method should only be called from within a callback.

     * </p>

     *

     * @return The frame start time, in the {@link System#nanoTime()} time base.

     *

     * @throws IllegalStateException if no frame is in progress.

     * @hide

     */

    @TestApi

    @UnsupportedAppUsage

    public long getExpectedPresentationTimeNanos() {

        return mFrameData.getPreferredFrameTimeline().getExpectedPresentationTimeNanos();

    }



    private void scheduleFrameLocked(long now) {

        if (!mFrameScheduled) {

            mFrameScheduled = true;