xref: /third_party/skia/gm/circularclips.cpp (revision cb93a386) 
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/gm.h"
9#include "include/core/SkCanvas.h"
10#include "include/core/SkClipOp.h"
11#include "include/core/SkPaint.h"
12#include "include/core/SkPath.h"
13#include "include/core/SkRect.h"
14#include "include/core/SkScalar.h"
15#include "include/core/SkSize.h"
16#include "include/core/SkString.h"
17#include "include/core/SkTypes.h"
18
19class CircularClipsGM : public skiagm::GM {
20    SkScalar fX1, fX2, fY, fR;
21    SkPath   fCircle1, fCircle2;
22
23protected:
24    void onOnceBeforeDraw() override {
25        fX1 = 80;
26        fX2 = 120;
27        fY = 50;
28        fR = 40;
29
30        fCircle1 = SkPath::Circle(fX1, fY, fR, SkPathDirection::kCW);
31        fCircle2 = SkPath::Circle(fX2, fY, fR, SkPathDirection::kCW);
32    }
33
34
35    bool runAsBench() const override { return true; }
36
37    SkString onShortName() override {
38        return SkString("circular-clips");
39    }
40
41    SkISize onISize() override {
42        return SkISize::Make(800, 200);
43    }
44
45    void onDraw(SkCanvas* canvas) override {
46        const SkClipOp ops[] = {
47            SkClipOp::kDifference,
48            SkClipOp::kIntersect
49        };
50
51        SkRect rect = SkRect::MakeLTRB(fX1 - fR, fY - fR, fX2 + fR, fY + fR);
52
53        SkPaint fillPaint;
54
55        // Giant background circular clips (AA, non-inverted, replace/isect)
56        fillPaint.setColor(0x80808080);
57        canvas->save();
58        canvas->scale(10, 10);
59        canvas->translate(-((fX1 + fX2)/2 - fR), -(fY - 2*fR/3));
60        canvas->clipPath(fCircle1, true);
61        canvas->clipPath(fCircle2, true);
62
63        canvas->drawRect(rect, fillPaint);
64
65        canvas->restore();
66
67        fillPaint.setColor(0xFF000000);
68
69        for (size_t i = 0; i < 4; i++) {
70            fCircle1.toggleInverseFillType();
71            if (i % 2 == 0) {
72                fCircle2.toggleInverseFillType();
73            }
74
75            canvas->save();
76            for (size_t op = 0; op < SK_ARRAY_COUNT(ops); op++) {
77                canvas->save();
78
79                canvas->clipPath(fCircle1);
80                canvas->clipPath(fCircle2, ops[op]);
81
82                canvas->drawRect(rect, fillPaint);
83
84                canvas->restore();
85                canvas->translate(0, 2 * fY);
86            }
87            canvas->restore();
88            canvas->translate(fX1 + fX2, 0);
89        }
90    }
91
92private:
93    using INHERITED = skiagm::GM;
94};
95
96//////////////////////////////////////////////////////////////////////////////
97
98DEF_GM( return new CircularClipsGM; )
99