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cdalton4a6e40d2016-02-10 14:54:21 -08001/*
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) {
Cary Clark58627cb2018-04-10 09:16:41 -040022 if (!antialias) {
23 fName.append("_bw");
24 }
25 }
26
27 SkString onShortName() override final { return fName; }
28 SkISize onISize() override { return SkISize::Make(500, 500); }
29
30 void onOnceBeforeDraw() override {
cdalton4a6e40d2016-02-10 14:54:21 -080031 fShapes.push_back().setOval(SkRect::MakeXYWH(-5, 25, 200, 100));
32 fRotations.push_back(21);
33
34 fShapes.push_back().setRect(SkRect::MakeXYWH(95, 75, 125, 100));
35 fRotations.push_back(94);
36
37 fShapes.push_back().setRectXY(SkRect::MakeXYWH(0, 75, 150, 100), 1e-5f, 1e-5f);
38 fRotations.push_back(132);
39
40 fShapes.push_back().setRectXY(SkRect::MakeXYWH(15, -20, 100, 100), 20, 15);
41 fRotations.push_back(282);
42
43 fSimpleShapeCount = fShapes.count();
44
45 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(140, -50, 90, 110), 10, 5, 25, 35);
46 fRotations.push_back(0);
47
48 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(160, -60, 60, 90), 10, 60, 50, 30);
49 fRotations.push_back(-35);
50
51 fShapes.push_back().setNinePatch(SkRect::MakeXYWH(220, -120, 60, 90), 1, 89, 59, 1);
52 fRotations.push_back(65);
53
54 SkVector radii[4] = {{4, 6}, {12, 8}, {24, 16}, {32, 48}};
55 fShapes.push_back().setRectRadii(SkRect::MakeXYWH(150, -129, 80, 160), radii);
56 fRotations.push_back(265);
57
58 SkVector radii2[4] = {{0, 0}, {80, 60}, {0, 0}, {80, 60}};
59 fShapes.push_back().setRectRadii(SkRect::MakeXYWH(180, -30, 80, 60), radii2);
60 fRotations.push_back(295);
61
cdalton4a6e40d2016-02-10 14:54:21 -080062 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}