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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #include "gm.h"
      9 #include "SkCanvas.h"
     10 #include "SkPath.h"
     11 
     12 namespace skiagm {
     13 
     14 class CircularClipsGM : public GM {
     15 public:
     16     CircularClipsGM() {}
     17 
     18 protected:
     19     virtual SkString onShortName() {
     20         return SkString("circular-clips");
     21     }
     22 
     23     virtual SkISize onISize() {
     24         return SkISize::Make(800, 600);
     25     }
     26 
     27     virtual void onDraw(SkCanvas* canvas) {
     28         SkRegion::Op ops[] = {
     29             SkRegion::kDifference_Op,
     30             SkRegion::kIntersect_Op,
     31             SkRegion::kUnion_Op,
     32             SkRegion::kXOR_Op,
     33             SkRegion::kReverseDifference_Op,
     34             SkRegion::kReplace_Op,
     35         };
     36 
     37         SkScalar x1 = 80, x2 = 120;
     38         SkScalar y = 50;
     39         SkScalar r = 40;
     40 
     41         SkPath circle1, circle2;
     42         circle1.addCircle(x1, y, r, SkPath::kCW_Direction);
     43         circle2.addCircle(x2, y, r, SkPath::kCW_Direction);
     44         SkRect rect = SkRect::MakeLTRB(x1 - r, y - r, x2 + r, y + r);
     45 
     46         SkPaint fillPaint;
     47 
     48         for (size_t i = 0; i < 4; i++) {
     49             circle1.toggleInverseFillType();
     50             if (i % 2 == 0) {
     51                 circle2.toggleInverseFillType();
     52             }
     53 
     54             canvas->save();
     55             for (size_t op = 0; op < SK_ARRAY_COUNT(ops); op++) {
     56                 canvas->save();
     57 
     58                 canvas->clipPath(circle1, SkRegion::kReplace_Op);
     59                 canvas->clipPath(circle2, ops[op]);
     60 
     61                 canvas->drawRect(rect, fillPaint);
     62 
     63                 canvas->restore();
     64                 canvas->translate(0, 2 * y);
     65             }
     66             canvas->restore();
     67             canvas->translate(x1 + x2, 0);
     68         }
     69     }
     70 
     71 private:
     72     typedef GM INHERITED;
     73 };
     74 
     75 //////////////////////////////////////////////////////////////////////////////
     76 
     77 DEF_GM( return new CircularClipsGM; )
     78 }
     79