1 files changed, 7 insertions, 0 deletions
diff --git a/src/core/SkEdge.cpp b/src/core/SkEdge.cpp
index 8a6d1710c9..4c264c2eb9 100644
--- a/src/core/SkEdge.cpp
+++ b/src/core/SkEdge.cpp
@@ -476,6 +476,13 @@ int SkCubicEdge::updateCubic()
             newx    = fCLastX;
             newy    = fCLastY;
         }
+        
+        // we want to say SkASSERT(oldy <= newy), but our finite fixedpoint
+        // doesn't always achieve that, so we have to explicitly pin it here.
+        if (newy < oldy) {
+            newy = oldy;
+        }
+
         success = this->updateLine(oldx, oldy, newx, newy);
         oldx = newx;
         oldy = newy;