Convert drawPaint to drawRRect in simple cases

include/core/SkClipStack.h

Index: include/core/SkClipStack.h
diff --git a/include/core/SkClipStack.h b/include/core/SkClipStack.h
index fb0b278405b3e35cb545d8746b7fd3bcfba7491a..3cdc5adc277e1bd72c54db7884cbeef1cb1d9885 100644
--- a/include/core/SkClipStack.h
+++ b/include/core/SkClipStack.h
@@ -365,6 +365,19 @@ public:
     bool isWideOpen() const { return this->getTopmostGenID() == kWideOpenGenID; }
 
     /**
+     * This method quickly and conservatively determines whether the entire stack is equivalent to
+     * intersection with a rrect given a bounds.
+     *
+     * @param bounds   A bounds on the geometry that will be drawn through the clip. The clip only

[robertphillips, 2016/08/26 14:00:43]

instersection ?

[bsalomon, 2016/08/26 14:19:18]

Done.

+     *                 need be equivalent to a instersection with a rrect within the bounds.
+     * @param rrect    If return is true rrect will contain the rrect equivalent to the stack.
+     * @param aa       If return is true aa will indicate whether the equivalent rrect clip is
+     *                 antialiased.
+     * @return true if the stack is equivalent to a single rrect intersect clip, false otherwise.
+     */
+    bool isRRect(const SkRect& bounds, SkRRect* rrect, bool* aa) const;
+
+    /**
      * The generation ID has three reserved values to indicate special
      * (potentially ignorable) cases
      */