src/third_party/skia/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 public:
  17     CircularClipsGM() {
  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 protected:
  28     virtual uint32_t onGetFlags() const SK_OVERRIDE {
  29         return kSkipTiled_Flag | kAsBench_Flag;
  30     }
  31
  32     virtual SkString onShortName() {
  33         return SkString("circular-clips");
  34     }
  35
  36     virtual SkISize onISize() {
  37         return SkISize::Make(800, 600);
  38     }
  39
  40     virtual void onDraw(SkCanvas* canvas) {
  41         SkRegion::Op ops[] = {
  42             SkRegion::kDifference_Op,
  43             SkRegion::kIntersect_Op,
  44             SkRegion::kUnion_Op,
  45             SkRegion::kXOR_Op,
  46             SkRegion::kReverseDifference_Op,
  47             SkRegion::kReplace_Op,
  48         };
  49
  50         SkRect rect = SkRect::MakeLTRB(fX1 - fR, fY - fR, fX2 + fR, fY + fR);
  51
  52         SkPaint fillPaint;
  53
  54         for (size_t i = 0; i < 4; i++) {
  55             fCircle1.toggleInverseFillType();
  56             if (i % 2 == 0) {
  57                 fCircle2.toggleInverseFillType();
  58             }
  59
  60             canvas->save();
  61             for (size_t op = 0; op < SK_ARRAY_COUNT(ops); op++) {
  62                 canvas->save();
  63
  64                 canvas->clipPath(fCircle1, SkRegion::kReplace_Op);
  65                 canvas->clipPath(fCircle2, ops[op]);
  66
  67                 canvas->drawRect(rect, fillPaint);
  68
  69                 canvas->restore();
  70                 canvas->translate(0, 2 * fY);
  71             }
  72             canvas->restore();
  73             canvas->translate(fX1 + fX2, 0);
  74         }
  75     }
  76
  77 private:
  78     typedef skiagm::GM INHERITED;
  79 };
  80
  81 //////////////////////////////////////////////////////////////////////////////
  82
  83 DEF_GM( return new CircularClipsGM; )