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Merge "Protect simultaneously modifying gesture preview data"

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Tadashi G. Takaoka 2013-04-10 09:34:59 +00:00 committed by Android (Google) Code Review
commit 1e256f5888
1 changed files with 15 additions and 1 deletions
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16
java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
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@ -37,6 +37,7 @@ import com.android.inputmethod.latin.ResizableIntArray;
final class GesturePreviewTrail { final class GesturePreviewTrail {
private static final int DEFAULT_CAPACITY = GestureStrokeWithPreviewPoints.PREVIEW_CAPACITY; private static final int DEFAULT_CAPACITY = GestureStrokeWithPreviewPoints.PREVIEW_CAPACITY;
// These three {@link ResizableIntArray}s should be synchronized by {@link #mEventTimes}.
private final ResizableIntArray mXCoordinates = new ResizableIntArray(DEFAULT_CAPACITY); private final ResizableIntArray mXCoordinates = new ResizableIntArray(DEFAULT_CAPACITY);
private final ResizableIntArray mYCoordinates = new ResizableIntArray(DEFAULT_CAPACITY); private final ResizableIntArray mYCoordinates = new ResizableIntArray(DEFAULT_CAPACITY);
private final ResizableIntArray mEventTimes = new ResizableIntArray(DEFAULT_CAPACITY); private final ResizableIntArray mEventTimes = new ResizableIntArray(DEFAULT_CAPACITY);
@ -90,7 +91,13 @@ final class GesturePreviewTrail {
} }
public void addStroke(final GestureStrokeWithPreviewPoints stroke, final long downTime) { public void addStroke(final GestureStrokeWithPreviewPoints stroke, final long downTime) {
final int trailSize = mEventTimes.getLength(); synchronized (mEventTimes) {
addStrokeLocked(stroke, downTime);
}
}
private void addStrokeLocked(final GestureStrokeWithPreviewPoints stroke, final long downTime) {
final int trailSize = mEventTimes.getLength();
stroke.appendPreviewStroke(mEventTimes, mXCoordinates, mYCoordinates); stroke.appendPreviewStroke(mEventTimes, mXCoordinates, mYCoordinates);
if (mEventTimes.getLength() == trailSize) { if (mEventTimes.getLength() == trailSize) {
return; return;
@ -169,6 +176,13 @@ final class GesturePreviewTrail {
*/ */
public boolean drawGestureTrail(final Canvas canvas, final Paint paint, public boolean drawGestureTrail(final Canvas canvas, final Paint paint,
final Rect outBoundsRect, final Params params) { final Rect outBoundsRect, final Params params) {
synchronized (mEventTimes) {
return drawGestureTrailLocked(canvas, paint, outBoundsRect, params);
}
}
private boolean drawGestureTrailLocked(final Canvas canvas, final Paint paint,
final Rect outBoundsRect, final Params params) {
// Initialize bounds rectangle. // Initialize bounds rectangle.
outBoundsRect.setEmpty(); outBoundsRect.setEmpty();
final int trailSize = mEventTimes.getLength(); final int trailSize = mEventTimes.getLength();