fix Region const_iterator.

- it returned an empty rect when the region was empty, instead
of returning an empty list of rect.

- also fixed an infinite loop when boolean_operation was given
an empty list of rects

Change-Id: I62225c7dcd2832025bb8f12e6cb3762f2a7b36cb

1 files changed, 9 insertions, 1 deletions

diff --git a/libs/ui/Region.cpp b/libs/ui/Region.cpp
index 6e2e731..2c7cdf0 100644
--- a/libs/ui/Region.cpp
+++ b/libs/ui/Region.cpp
@@ -619,7 +619,15 @@ Region::const_iterator Region::begin() const {
 }
 
 Region::const_iterator Region::end() const {
-    return isRect() ? ((&mBounds) + 1) : (mStorage.array() + mStorage.size());
+    if (isRect()) {
+        if (isEmpty()) {
+            return &mBounds;
+        } else {
+            return &mBounds + 1;
+        }
+    } else {
+        return mStorage.array() + mStorage.size();
+    }
 }
 
 Rect const* Region::getArray(size_t* count) const {