1/*
2 * Copyright 2016 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 "SkRandom.h"
10#include "SkRRect.h"
11
12namespace skiagm {
13
14/*
15 * This is the base class for two GMs that cover various corner cases with primitive Skia shapes
16 * (zero radius, near-zero radius, inner shape overlap, etc.) It uses an xfermode of darken to help
17 * double-blended and/or dropped pixels stand out.
18 */
19class ShapesGM : public GM {
20protected:
21    ShapesGM(const char* name, bool antialias) : fName(name), fAntialias(antialias) {
22        fShapes.push_back().setOval(SkRect::MakeXYWH(-5, 25, 200, 100));
23        fRotations.push_back(21);
24
25        fShapes.push_back().setRect(SkRect::MakeXYWH(95, 75, 125, 100));
26        fRotations.push_back(94);
27
28        fShapes.push_back().setRectXY(SkRect::MakeXYWH(0, 75, 150, 100), 1e-5f, 1e-5f);
29        fRotations.push_back(132);
30
31        fShapes.push_back().setRectXY(SkRect::MakeXYWH(15, -20, 100, 100), 20, 15);
32        fRotations.push_back(282);
33
34        fSimpleShapeCount = fShapes.count();
35
36        fShapes.push_back().setNinePatch(SkRect::MakeXYWH(140, -50, 90, 110), 10, 5, 25, 35);
37        fRotations.push_back(0);
38
39        fShapes.push_back().setNinePatch(SkRect::MakeXYWH(160, -60, 60, 90), 10, 60, 50, 30);
40        fRotations.push_back(-35);
41
42        fShapes.push_back().setNinePatch(SkRect::MakeXYWH(220, -120, 60, 90), 1, 89, 59, 1);
43        fRotations.push_back(65);
44
45        SkVector radii[4] = {{4, 6}, {12, 8}, {24, 16}, {32, 48}};
46        fShapes.push_back().setRectRadii(SkRect::MakeXYWH(150, -129, 80, 160), radii);
47        fRotations.push_back(265);
48
49        SkVector radii2[4] = {{0, 0}, {80, 60}, {0, 0}, {80, 60}};
50        fShapes.push_back().setRectRadii(SkRect::MakeXYWH(180, -30, 80, 60), radii2);
51        fRotations.push_back(295);
52
53        if (!antialias) {
54            fName.append("_bw");
55        }
56    }
57
58    SkString onShortName() override final { return fName; }
59    SkISize onISize() override { return SkISize::Make(500, 500); }
60
61    void onOnceBeforeDraw() override {
62        fPaint.setAntiAlias(fAntialias);
63    }
64
65    void onDraw(SkCanvas* canvas) override {
66        canvas->clear(SK_ColorWHITE);
67
68        canvas->save();
69        canvas->translate(canvas->imageInfo().width() / 2.f, canvas->imageInfo().height() / 2.f);
70        this->drawShapes(canvas);
71        canvas->restore();
72    }
73
74    virtual void drawShapes(SkCanvas* canvas) const = 0;
75
76protected:
77    SkString             fName;
78    bool                 fAntialias;
79    SkPaint              fPaint;
80    SkTArray<SkRRect>    fShapes;
81    SkTArray<SkScalar>   fRotations;
82    int                  fSimpleShapeCount;
83
84private:
85    typedef GM INHERITED;
86};
87
88class SimpleShapesGM : public ShapesGM {
89public:
90    SimpleShapesGM(bool antialias) : INHERITED("simpleshapes", antialias) {}
91
92private:
93    void drawShapes(SkCanvas* canvas) const override {
94        SkRandom rand(2);
95        for (int i = 0; i < fShapes.count(); i++) {
96            SkPaint paint(fPaint);
97            paint.setColor(rand.nextU() & ~0x808080);
98            paint.setAlpha(128);  // Use alpha to detect double blends.
99            const SkRRect& shape = fShapes[i];
100            canvas->save();
101            canvas->rotate(fRotations[i]);
102            switch (shape.getType()) {
103                case SkRRect::kRect_Type:
104                    canvas->drawRect(shape.rect(), paint);
105                    break;
106                case SkRRect::kOval_Type:
107                    canvas->drawOval(shape.rect(), paint);
108                    break;
109                default:
110                    canvas->drawRRect(shape, paint);
111                    break;
112            }
113            canvas->restore();
114        }
115    }
116
117    typedef ShapesGM INHERITED;
118};
119
120class InnerShapesGM : public ShapesGM {
121public:
122    InnerShapesGM(bool antialias) : INHERITED("innershapes", antialias) {}
123
124private:
125    void drawShapes(SkCanvas* canvas) const override {
126        SkRandom rand;
127        for (int i = 0; i < fShapes.count(); i++) {
128            const SkRRect& outer = fShapes[i];
129            const SkRRect& inner = fShapes[(i * 7 + 11) % fSimpleShapeCount];
130            float s = 0.95f * SkTMin(outer.rect().width() / inner.rect().width(),
131                                     outer.rect().height() / inner.rect().height());
132            SkMatrix innerXform;
133            float dx = (rand.nextF() - 0.5f) * (outer.rect().width() - s * inner.rect().width());
134            float dy = (rand.nextF() - 0.5f) * (outer.rect().height() - s * inner.rect().height());
135            innerXform.setTranslate(outer.rect().centerX() + dx, outer.rect().centerY() + dy);
136            if (s < 1) {
137                innerXform.preScale(s, s);
138            }
139            innerXform.preTranslate(-inner.rect().centerX(), -inner.rect().centerY());
140            SkRRect xformedInner;
141            inner.transform(innerXform, &xformedInner);
142            SkPaint paint(fPaint);
143            paint.setColor(rand.nextU() & ~0x808080);
144            paint.setAlpha(128);  // Use alpha to detect double blends.
145            canvas->save();
146            canvas->rotate(fRotations[i]);
147            canvas->drawDRRect(outer, xformedInner, paint);
148            canvas->restore();
149        }
150    }
151
152    typedef ShapesGM INHERITED;
153};
154
155//////////////////////////////////////////////////////////////////////////////
156
157DEF_GM( return new SimpleShapesGM(true); )
158DEF_GM( return new SimpleShapesGM(false); )
159DEF_GM( return new InnerShapesGM(true); )
160DEF_GM( return new InnerShapesGM(false); )
161
162}
163