Convert drawPaint to drawRRect in simple cases

include/core/SkClipStack.h

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkClipStack_DEFINED
 #define SkClipStack_DEFINED
 
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     // An optimized version of clipDevRect(emptyRect, kIntersect, ...)
     void clipEmpty();
 
     /**
      * isWideOpen returns true if the clip state corresponds to the infinite
      * plane (i.e., draws are not limited at all)
      */
     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, where the rrect must not contain the entire bounds.
+     *
+     * @param bounds   A bounds on what will be drawn through the clip. The clip only need be
+     *                 equivalent to a intersection with a rrect for draws within the bounds. The
+     *                 returned rrect must intersect the bounds but need not be contained by 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
      */
     static const int32_t kInvalidGenID = 0;     //!< Invalid id that is never returned by
                                                 //!< SkClipStack. Useful when caching clips
                                                 //!< based on GenID.
     static const int32_t kEmptyGenID = 1;       // no pixels writeable
     static const int32_t kWideOpenGenID = 2;    // all pixels writeable
 
     int32_t getTopmostGenID() const;
@@ skipping 119 matching lines @@
      */
     void restoreTo(int saveCount);
 
     /**
      * Return the next unique generation ID.
      */
     static int32_t GetNextGenID();
 };
 
 #endif