gm/circularclips.cpp

   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; )