Fix SkClipStack bug with inverse-filled difference elements
Previously, SkClipStack would call "setEmpty" on itself when an
inverse-filled difference element made the stack empty. This was
a problem because setEmpty would forget the element had an inverse
fill, yet leave the op as "difference". This change modifies it to
manually update the clip bounds and set the gen-ID to kEmptyGenID,
rather than calling setEmpty.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2175493002
Review-Url: https://codereview.chromium.org/2175493002
diff --git a/src/core/SkClipStack.cpp b/src/core/SkClipStack.cpp
index e39aeee..06418b4 100644
--- a/src/core/SkClipStack.cpp
+++ b/src/core/SkClipStack.cpp
@@ -237,10 +237,10 @@
// is erased, so the only pixels that can remain set
// occur w/in the intersection of the two finite bounds
if (!fFiniteBound.intersect(prevFinite)) {
- this->setEmpty();
- } else {
- fFiniteBoundType = kNormal_BoundsType;
+ fFiniteBound.setEmpty();
+ fGenID = kEmptyGenID;
}
+ fFiniteBoundType = kNormal_BoundsType;
break;
case kPrev_Cur_FillCombo:
// The most conservative result bound is that of the