Analytic rrect clip for cicular corners, radius >= .5

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 56 matching lines @@
     }
 
     void setUpRRects() {
         // each RRect must fit in a 0x0 -> (kTileX-2)x(kTileY-2) block. These will be tiled across
         // the screen in kTileX x kTileY tiles. The extra empty pixels on each side are for AA.
 
         // simple cases
         fRRects[0].setRect(SkRect::MakeWH(kTileX-2, kTileY-2));
         fRRects[1].setOval(SkRect::MakeWH(kTileX-2, kTileY-2));
         fRRects[2].setRectXY(SkRect::MakeWH(kTileX-2, kTileY-2), 10, 10);
+        fRRects[3].setRectXY(SkRect::MakeWH(kTileX-2, kTileY-2), 10, 5);
+        // small circular corners are an interesting test case for gpu clipping
+        fRRects[4].setRectXY(SkRect::MakeWH(kTileX-2, kTileY-2), 1, 1);
+        fRRects[5].setRectXY(SkRect::MakeWH(kTileX-2, kTileY-2), 0.5f, 0.5f);
+        fRRects[6].setRectXY(SkRect::MakeWH(kTileX-2, kTileY-2), 0.2f, 0.2f);
 
         // The first complex case needs special handling since it is a square
         fRRects[kNumSimpleCases].setRectRadii(SkRect::MakeWH(kTileY-2, kTileY-2), gRadii[0]);
         for (size_t i = 1; i < SK_ARRAY_COUNT(gRadii); ++i) {
             fRRects[kNumSimpleCases+i].setRectRadii(SkRect::MakeWH(kTileX-2, kTileY-2), gRadii[i]);
         }
     }
 
 private:
     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 = 3;
+    static const int kNumSimpleCases = 7;
     static const int kNumComplexCases = 19;
     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
@@ skipping 33 matching lines @@
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 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); )
 
 }