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SurfaceView: Ensure we don't fill unused BLAST Transaction.

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If BLAST is enabled and we somehow end up in positionLost or
setParentSpaceRectangle without having called setUseBLASTSyncTransaction
we will end up putting operations in to a Transaction which will never be
applied. This condition should be considered a bug, but it's best to
defend against it. To compensate, rather than checking the global
use BLAST flag, we check if the current draw is actually using
BLAST.

Bug: 152663327
Bug: 152780239
Test: Existing tests pass
Change-Id: I3c05b83400b59be82a339933fc8ef1382d4f0e21
This commit is contained in:
Robert Carr
2020-04-01 14:29:13 -07:00
parent b164ea9d7a
commit 92e08bf997
2 changed files with 11 additions and 3 deletions
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6
core/java/android/view/SurfaceView.java
View File

@@ -1241,7 +1241,7 @@ public class SurfaceView extends View implements ViewRootImpl.SurfaceChangedCall
private void applySurfaceTransforms(SurfaceControl surface, SurfaceControl.Transaction t,
Rect position, long frameNumber) {
final ViewRootImpl viewRoot = getViewRootImpl();
if (frameNumber > 0 && viewRoot != null && !viewRoot.useBLAST()) {
if (frameNumber > 0 && viewRoot != null && !viewRoot.isDrawingToBLASTTransaction()) {
t.deferTransactionUntil(surface, viewRoot.getRenderSurfaceControl(),
frameNumber);
}
@@ -1258,7 +1258,7 @@ public class SurfaceView extends View implements ViewRootImpl.SurfaceChangedCall
private void setParentSpaceRectangle(Rect position, long frameNumber) {
final ViewRootImpl viewRoot = getViewRootImpl();
final boolean useBLAST = viewRoot.useBLAST();
final boolean useBLAST = viewRoot.isDrawingToBLASTTransaction();
final SurfaceControl.Transaction t = useBLAST ? viewRoot.getBLASTSyncTransaction() :
mRtTransaction;
@@ -1319,7 +1319,7 @@ public class SurfaceView extends View implements ViewRootImpl.SurfaceChangedCall
@Override
public void positionLost(long frameNumber) {
final ViewRootImpl viewRoot = getViewRootImpl();
boolean useBLAST = viewRoot != null && viewRoot.useBLAST();
boolean useBLAST = viewRoot != null && viewRoot.isDrawingToBLASTTransaction();
if (DEBUG) {
Log.d(TAG, String.format("%d windowPositionLost, frameNr = %d",
System.identityHashCode(this), frameNumber));

8
core/java/android/view/ViewRootImpl.java
View File

@@ -9595,4 +9595,12 @@ public final class ViewRootImpl implements ViewParent,
boolean useBLAST() {
return mUseBLASTAdapter;
}
/**
* Returns true if we are about to or currently processing a draw directed
* in to a BLAST transaction.
*/
boolean isDrawingToBLASTTransaction() {
return mNextReportConsumeBLAST;
}
}