Add createTJunctionFreeRegion
T-junction free regions are useful for rendering regions with various
geometric transformations, and the Region's span-ordered, sorted rect
list supports T-junction free storage without modification.
This approach creates a T-junction free region by splitting each
rectangle that is part of a vertical T-junction. This approach is two
pass (up and down) so that divisions can trickle up/down to other
adjacent spans.
Change-Id: Ifcf5e6fe0034c96b00ef09a4433b2b0fce8f4300
diff --git a/include/ui/Region.h b/include/ui/Region.h
index 43a4450..ffcd429 100644
--- a/include/ui/Region.h
+++ b/include/ui/Region.h
@@ -39,7 +39,9 @@
Region(const Region& rhs);
explicit Region(const Rect& rhs);
~Region();
-
+
+ static Region createTJunctionFreeRegion(const Region& r);
+
Region& operator = (const Region& rhs);
inline bool isEmpty() const { return getBounds().isEmpty(); }