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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 class CircularClipsGM : public skiagm::GM {
     13     SkScalar fX1, fX2, fY, fR;
     14     SkPath   fCircle1, fCircle2;
     15 
     16 protected:
     17     void onOnceBeforeDraw() override {
     18         fX1 = 80;
     19         fX2 = 120;
     20         fY = 50;
     21         fR = 40;
     22 
     23         fCircle1.addCircle(fX1, fY, fR, SkPath::kCW_Direction);
     24         fCircle2.addCircle(fX2, fY, fR, SkPath::kCW_Direction);
     25     }
     26 
     27 
     28     bool runAsBench() const override { return true; }
     29 
     30     SkString onShortName() override {
     31         return SkString("circular-clips");
     32     }
     33 
     34     SkISize onISize() override {
     35         return SkISize::Make(800, 600);
     36     }
     37 
     38     void onDraw(SkCanvas* canvas) override {
     39         const SkClipOp ops[] = {
     40             kDifference_SkClipOp,
     41             kIntersect_SkClipOp,
     42             kUnion_SkClipOp,
     43             kXOR_SkClipOp,
     44             kReverseDifference_SkClipOp,
     45             kReplace_SkClipOp,
     46         };
     47 
     48         SkRect rect = SkRect::MakeLTRB(fX1 - fR, fY - fR, fX2 + fR, fY + fR);
     49 
     50         SkPaint fillPaint;
     51 
     52         // Giant background circular clips (AA, non-inverted, replace/isect)
     53         fillPaint.setColor(0x80808080);
     54         canvas->save();
     55         canvas->scale(10, 10);
     56         canvas->translate(-((fX1 + fX2)/2 - fR), -(fY - 2*fR/3));
     57         canvas->clipPath(fCircle1, true);
     58         canvas->clipPath(fCircle2, true);
     59 
     60         canvas->drawRect(rect, fillPaint);
     61 
     62         canvas->restore();
     63 
     64         fillPaint.setColor(0xFF000000);
     65 
     66         for (size_t i = 0; i < 4; i++) {
     67             fCircle1.toggleInverseFillType();
     68             if (i % 2 == 0) {
     69                 fCircle2.toggleInverseFillType();
     70             }
     71 
     72             canvas->save();
     73             for (size_t op = 0; op < SK_ARRAY_COUNT(ops); op++) {
     74                 canvas->save();
     75 
     76                 canvas->clipPath(fCircle1);
     77                 canvas->clipPath(fCircle2, ops[op]);
     78 
     79                 canvas->drawRect(rect, fillPaint);
     80 
     81                 canvas->restore();
     82                 canvas->translate(0, 2 * fY);
     83             }
     84             canvas->restore();
     85             canvas->translate(fX1 + fX2, 0);
     86         }
     87     }
     88 
     89 private:
     90     typedef skiagm::GM INHERITED;
     91 };
     92 
     93 //////////////////////////////////////////////////////////////////////////////
     94 
     95 DEF_GM( return new CircularClipsGM; )
     96