Add effect-based clipping for circular "tab" style rrects.

gm/rrects.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkRRect.h"
 
@@ skipping 80 matching lines @@
     bool fDoAA;
     bool fDoClip;   // use clipRRect & drawRect instead of drawRRect
 
     static const int kImageWidth = 640;
     static const int kImageHeight = 480;
 
     static const int kTileX = 80;
     static const int kTileY = 40;
 
     static const int kNumSimpleCases = 7;
-    static const int kNumComplexCases = 19;
+    static const int kNumComplexCases = 23;
     static const SkVector gRadii[kNumComplexCases][4];
 
     static const int kNumRRects = kNumSimpleCases + kNumComplexCases;
     SkRRect fRRects[kNumRRects];
 
     typedef GM INHERITED;
 };
 
 // Radii for the various test cases. Order is UL, UR, LR, LL
 const SkVector RRectGM::gRadii[kNumComplexCases][4] = {
@@ skipping 22 matching lines @@
 
     // LL
     { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 30, 30 } },
     { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 30, 15 } },
     { { 0, 0 }, { 0, 0 }, { 0, 0 }, { 15, 30 } },
 
     // over-sized radii
     { { 0, 0 }, { 100, 400 }, { 0, 0 }, { 0, 0 } },
     { { 0, 0 }, { 400, 400 }, { 0, 0 }, { 0, 0 } },
     { { 400, 400 }, { 400, 400 }, { 400, 400 }, { 400, 400 } },
+
+    // circular corner tabs
+    { { 0, 0 }, { 20, 20 }, { 20, 20 }, { 0, 0 } },
+    { { 20, 20 }, { 20, 20 }, { 0, 0 }, { 0, 0 } },
+    { { 0, 0 }, { 0, 0 }, { 20, 20 }, { 20, 20 } },
+    { { 20, 20 }, { 0, 0 }, { 0, 0 }, { 20, 20 } },
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new RRectGM(false, false); )
 DEF_GM( return new RRectGM(true, false); )
 DEF_GM( return new RRectGM(false, true); )
 DEF_GM( return new RRectGM(true, true); )
 
 }