fix [1947273] the DimLayer causes the whole screen to update during transactions
diff --git a/libs/surfaceflinger/SurfaceFlinger.cpp b/libs/surfaceflinger/SurfaceFlinger.cpp
index 106af3f..17cff55 100644
--- a/libs/surfaceflinger/SurfaceFlinger.cpp
+++ b/libs/surfaceflinger/SurfaceFlinger.cpp
@@ -725,10 +725,11 @@
dirty.orSelf(layer->visibleRegionScreen);
layer->contentDirty = false;
} else {
- // compute the exposed region
- // dirty = what's visible now - what's wasn't covered before
- // = what's visible now & what's was covered before
- dirty = visibleRegion.intersect(layer->coveredRegionScreen);
+ /* compute the exposed region:
+ * exposed = what's VISIBLE and NOT COVERED now
+ * but was COVERED before
+ */
+ dirty = (visibleRegion - coveredRegion) & layer->coveredRegionScreen;
}
dirty.subtractSelf(aboveOpaqueLayers);
@@ -737,7 +738,7 @@
// Update aboveOpaqueLayers/aboveCoveredLayers for next (lower) layer
aboveOpaqueLayers.orSelf(opaqueRegion);
- aboveCoveredLayers.orSelf(bounds);
+ aboveCoveredLayers.orSelf(visibleRegion);
// Store the visible region is screen space
layer->setVisibleRegion(visibleRegion);