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Map the Android VsyncWaiter frame start time to the clock used by fml::TimePoint (flutter/engine#29093)

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This commit is contained in:
Jason Simmons 2021-10-11 13:13:01 -07:00 committed by GitHub
parent b201dc0a1f
commit f30e10db45
4 changed files with 16 additions and 12 deletions
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2
engine/src/flutter/shell/platform/android/io/flutter/embedding/engine/FlutterJNI.java
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@ -238,7 +238,7 @@ public class FlutterJNI {
// TODO(mattcarroll): add javadocs
public static native void nativeOnVsync(
long frameTimeNanos, long frameTargetTimeNanos, long cookie);
long frameDelayNanos, long refreshPeriodNanos, long cookie);
// TODO(mattcarroll): add javadocs
@NonNull

10
engine/src/flutter/shell/platform/android/io/flutter/view/VsyncWaiter.java
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@ -21,6 +21,7 @@ public class VsyncWaiter {
}
private final float fps;
private final long refreshPeriodNanos;
private final FlutterJNI.AsyncWaitForVsyncDelegate asyncWaitForVsyncDelegate =
new FlutterJNI.AsyncWaitForVsyncDelegate() {
@ -31,9 +32,11 @@ public class VsyncWaiter {
new Choreographer.FrameCallback() {
@Override
public void doFrame(long frameTimeNanos) {
long refreshPeriodNanos = (long) (1000000000.0 / fps);
FlutterJNI.nativeOnVsync(
frameTimeNanos, frameTimeNanos + refreshPeriodNanos, cookie);
long delay = System.nanoTime() - frameTimeNanos;
if (delay < 0) {
delay = 0;
}
FlutterJNI.nativeOnVsync(delay, refreshPeriodNanos, cookie);
}
});
}
@ -41,6 +44,7 @@ public class VsyncWaiter {
private VsyncWaiter(float fps) {
this.fps = fps;
refreshPeriodNanos = (long) (1000000000.0 / fps);
}
public void init() {

12
engine/src/flutter/shell/platform/android/vsync_waiter_android.cc
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@ -41,15 +41,15 @@ void VsyncWaiterAndroid::AwaitVSync() {
// static
void VsyncWaiterAndroid::OnNativeVsync(JNIEnv* env,
jclass jcaller,
jlong frameTimeNanos,
jlong frameTargetTimeNanos,
jlong frameDelayNanos,
jlong refreshPeriodNanos,
jlong java_baton) {
TRACE_EVENT0("flutter", "VSYNC");
auto frame_time = fml::TimePoint::FromEpochDelta(
fml::TimeDelta::FromNanoseconds(frameTimeNanos));
auto target_time = fml::TimePoint::FromEpochDelta(
fml::TimeDelta::FromNanoseconds(frameTargetTimeNanos));
auto frame_time =
fml::TimePoint::Now() - fml::TimeDelta::FromNanoseconds(frameDelayNanos);
auto target_time =
frame_time + fml::TimeDelta::FromNanoseconds(refreshPeriodNanos);
ConsumePendingCallback(java_baton, frame_time, target_time);
}

4
engine/src/flutter/shell/platform/android/vsync_waiter_android.h
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@ -28,8 +28,8 @@ class VsyncWaiterAndroid final : public VsyncWaiter {
static void OnNativeVsync(JNIEnv* env,
jclass jcaller,
jlong frameTimeNanos,
jlong frameTargetTimeNanos,
jlong frameDelayNanos,
jlong refreshPeriodNanos,
jlong java_baton);
static void ConsumePendingCallback(jlong java_baton,