diff options
| -rw-r--r-- | libs/surfaceflinger/SurfaceFlinger.cpp | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/libs/surfaceflinger/SurfaceFlinger.cpp b/libs/surfaceflinger/SurfaceFlinger.cpp index 0e998bfe4b..ef4a8ea17a 100644 --- a/libs/surfaceflinger/SurfaceFlinger.cpp +++ b/libs/surfaceflinger/SurfaceFlinger.cpp @@ -771,10 +771,11 @@ void SurfaceFlinger::computeVisibleRegions( 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); @@ -783,7 +784,7 @@ void SurfaceFlinger::computeVisibleRegions( // updade 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); |