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Commit e32aa4fd authored by Chris Li's avatar Chris Li
Browse files

Fix NPE for animate frozen snapshot 

Before, the snapshot can be null if the window is unfreezed but not
removed from the display changing list, or when it fails to take
screenshot (like because the display is not ready). Now, we make sure to
remove the window from the changing list in such cases.

Fix: 204400505
Test: atest WmTests:WindowContainerTests
Change-Id: I517232fc2ec689680a00b499495a4bad5a0d5f15
parent 8f7d2534

services/core/java/com/android/server/wm/SurfaceAnimator.java

+4 −0
Original line number Diff line number Diff line
@@ -188,6 +188,10 @@ class SurfaceAnimator { 
        mAnimation.startAnimation(mLeash, t, type, mInnerAnimationFinishedCallback);

        if (snapshotAnim != null) {

            mSnapshot = freezer.takeSnapshotForAnimation();

            if (mSnapshot == null) {

                Slog.e(TAG, "No snapshot target to start animation on for " + mAnimatable);

                return;

            }

            mSnapshot.startAnimation(t, snapshotAnim, type);

        }

    }

services/core/java/com/android/server/wm/SurfaceFreezer.java

+31 −8
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ import android.graphics.PixelFormat; 
import android.graphics.Point;

import android.graphics.Rect;

import android.hardware.HardwareBuffer;

import android.util.Slog;

import android.view.SurfaceControl;



import com.android.internal.annotations.VisibleForTesting;
@@ -49,8 +50,10 @@ import com.android.internal.protolog.common.ProtoLog; 
 */

class SurfaceFreezer {



    private final Freezable mAnimatable;

    private final WindowManagerService mWmService;

    private static final String TAG = "SurfaceFreezer";



    private final @NonNull Freezable mAnimatable;

    private final @NonNull WindowManagerService mWmService;

    @VisibleForTesting

    SurfaceControl mLeash;

    Snapshot mSnapshot = null;
@@ -59,7 +62,7 @@ class SurfaceFreezer { 
    /**

     * @param animatable The object to animate.

     */

    SurfaceFreezer(Freezable animatable, WindowManagerService service) {

    SurfaceFreezer(@NonNull Freezable animatable, @NonNull WindowManagerService service) {

        mAnimatable = animatable;

        mWmService = service;

    }
@@ -86,11 +89,14 @@ class SurfaceFreezer { 


        freezeTarget = freezeTarget != null ? freezeTarget : mAnimatable.getFreezeSnapshotTarget();

        if (freezeTarget != null) {

            SurfaceControl.ScreenshotHardwareBuffer screenshotBuffer = createSnapshotBuffer(

            SurfaceControl.ScreenshotHardwareBuffer screenshotBuffer = createSnapshotBufferInner(

                    freezeTarget, startBounds);

            final HardwareBuffer buffer = screenshotBuffer == null ? null

                    : screenshotBuffer.getHardwareBuffer();

            if (buffer == null || buffer.getWidth() <= 1 || buffer.getHeight() <= 1) {

                // This can happen when display is not ready.

                Slog.w(TAG, "Failed to capture screenshot for " + mAnimatable);

                unfreeze(t);

                return;

            }

            mSnapshot = new Snapshot(t, screenshotBuffer, mLeash);
@@ -124,6 +130,11 @@ class SurfaceFreezer { 
     * snapshot.

     */

    void unfreeze(SurfaceControl.Transaction t) {

        unfreezeInner(t);

        mAnimatable.onUnfrozen();

    }



    private void unfreezeInner(SurfaceControl.Transaction t) {

        if (mSnapshot != null) {

            mSnapshot.cancelAnimation(t, false /* restarting */);

            mSnapshot = null;
@@ -188,6 +199,18 @@ class SurfaceFreezer { 
        return SurfaceControl.captureLayers(captureArgs);

    }



    @VisibleForTesting

    SurfaceControl.ScreenshotHardwareBuffer createSnapshotBufferInner(

            SurfaceControl target, Rect bounds) {

        return createSnapshotBuffer(target, bounds);

    }



    @VisibleForTesting

    GraphicBuffer createFromHardwareBufferInner(

            SurfaceControl.ScreenshotHardwareBuffer screenshotBuffer) {

        return GraphicBuffer.createFromHardwareBuffer(screenshotBuffer.getHardwareBuffer());

    }



    class Snapshot {

        private SurfaceControl mSurfaceControl;

        private AnimationAdapter mAnimation;
@@ -198,10 +221,7 @@ class SurfaceFreezer { 
         */

        Snapshot(SurfaceControl.Transaction t,

                SurfaceControl.ScreenshotHardwareBuffer screenshotBuffer, SurfaceControl parent) {

            // We can't use a delegating constructor since we need to

            // reference this::onAnimationFinished

            GraphicBuffer graphicBuffer = GraphicBuffer.createFromHardwareBuffer(

                    screenshotBuffer.getHardwareBuffer());

            GraphicBuffer graphicBuffer = createFromHardwareBufferInner(screenshotBuffer);



            mSurfaceControl = mAnimatable.makeAnimationLeash()

                    .setName("snapshot anim: " + mAnimatable.toString())
@@ -275,5 +295,8 @@ class SurfaceFreezer { 
         *         will be generated (but the rest of the freezing logic will still happen).

         */

        @Nullable SurfaceControl getFreezeSnapshotTarget();



        /** Called when the {@link #unfreeze(SurfaceControl.Transaction)} is called. */

        void onUnfrozen();

    }

}

services/core/java/com/android/server/wm/WindowContainer.java

+7 −4
Original line number Diff line number Diff line
@@ -614,7 +614,6 @@ class WindowContainer<E extends WindowContainer> extends ConfigurationContainer< 
        final DisplayContent dc = getDisplayContent();

        if (dc != null) {

            mSurfaceFreezer.unfreeze(getSyncTransaction());

            dc.mChangingContainers.remove(this);

        }

        while (!mChildren.isEmpty()) {

            final E child = mChildren.peekLast();
@@ -1067,9 +1066,6 @@ class WindowContainer<E extends WindowContainer> extends ConfigurationContainer< 
        // part of a change transition.

        if (!visible) {

            mSurfaceFreezer.unfreeze(getSyncTransaction());

            if (mDisplayContent != null) {

                mDisplayContent.mChangingContainers.remove(this);

            }

        }

        WindowContainer parent = getParent();

        if (parent != null) {
@@ -2647,6 +2643,13 @@ class WindowContainer<E extends WindowContainer> extends ConfigurationContainer< 
        return getSurfaceControl();

    }



    @Override

    public void onUnfrozen() {

        if (mDisplayContent != null) {

            mDisplayContent.mChangingContainers.remove(this);

        }

    }



    @Override

    public Builder makeAnimationLeash() {

        return makeSurface().setContainerLayer();

services/tests/wmtests/src/com/android/server/wm/AppTransitionTests.java

+1 −0
Original line number Diff line number Diff line
@@ -419,6 +419,7 @@ public class AppTransitionTests extends WindowTestsBase { 
        task.getBounds(taskBounds);

        taskFragment.setBounds(0, 0, taskBounds.right / 2, taskBounds.bottom);

        spyOn(taskFragment);

        mockSurfaceFreezerSnapshot(taskFragment.mSurfaceFreezer);



        assertTrue(mDc.mChangingContainers.isEmpty());

        assertFalse(mDc.mAppTransition.isTransitionSet());

services/tests/wmtests/src/com/android/server/wm/TaskFragmentTest.java

+1 −0
Original line number Diff line number Diff line
@@ -82,6 +82,7 @@ public class TaskFragmentTest extends WindowTestsBase { 


    @Test

    public void testStartChangeTransition_resetSurface() {

        mockSurfaceFreezerSnapshot(mTaskFragment.mSurfaceFreezer);

        final Rect startBounds = new Rect(0, 0, 1000, 1000);

        final Rect endBounds = new Rect(500, 500, 1000, 1000);

        mTaskFragment.setBounds(startBounds);