blob: 5a7768590c39405c7f060a763a76682d80d1a73b [file] [log] [blame]
joshualitt5ce33c12015-01-28 11:08:00 -08001
2/*
3 * Copyright 2013 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "gm.h"
9#include "SkBitmap.h"
10#include "SkRandom.h"
11#include "SkShader.h"
12#include "SkXfermode.h"
13
14namespace skiagm {
15
16/**
17 * Renders overlapping shapes with colorburn against a checkerboard.
18 */
19class DstReadShuffle : public GM {
20public:
21 DstReadShuffle() {
22 this->setBGColor(SkColorSetARGB(0xff, 0xff, 0, 0xff));
23 }
24
25protected:
26 enum ShapeType {
27 kCircle_ShapeType,
28 kRoundRect_ShapeType,
29 kRect_ShapeType,
30 kConvexPath_ShapeType,
31 kConcavePath_ShapeType,
32 kText_ShapeType,
33 kNumShapeTypes
34 };
35
mtklein36352bf2015-03-25 18:17:31 -070036 SkString onShortName() override {
joshualitt5ce33c12015-01-28 11:08:00 -080037 return SkString("dstreadshuffle");
38 }
39
mtklein36352bf2015-03-25 18:17:31 -070040 SkISize onISize() override {
joshualitt5ce33c12015-01-28 11:08:00 -080041 return SkISize::Make(kWidth, kHeight);
42 }
43
44 void drawShape(SkCanvas* canvas,
45 SkPaint* paint,
46 ShapeType type) {
47 static const SkRect kRect = SkRect::MakeXYWH(SkIntToScalar(-50), SkIntToScalar(-50),
48 SkIntToScalar(75), SkIntToScalar(105));
49 switch (type) {
50 case kCircle_ShapeType:
51 canvas->drawCircle(0, 0, 50, *paint);
52 break;
53 case kRoundRect_ShapeType:
54 canvas->drawRoundRect(kRect, SkIntToScalar(10), SkIntToScalar(20), *paint);
55 break;
56 case kRect_ShapeType:
57 canvas->drawRect(kRect, *paint);
58 break;
59 case kConvexPath_ShapeType:
60 if (fConvexPath.isEmpty()) {
61 SkPoint points[4];
62 kRect.toQuad(points);
63 fConvexPath.moveTo(points[0]);
64 fConvexPath.quadTo(points[1], points[2]);
65 fConvexPath.quadTo(points[3], points[0]);
66 SkASSERT(fConvexPath.isConvex());
67 }
68 canvas->drawPath(fConvexPath, *paint);
69 break;
70 case kConcavePath_ShapeType:
71 if (fConcavePath.isEmpty()) {
72 SkPoint points[5] = {{0, SkIntToScalar(-50)} };
73 SkMatrix rot;
74 rot.setRotate(SkIntToScalar(360) / 5);
75 for (int i = 1; i < 5; ++i) {
76 rot.mapPoints(points + i, points + i - 1, 1);
77 }
78 fConcavePath.moveTo(points[0]);
79 for (int i = 0; i < 5; ++i) {
80 fConcavePath.lineTo(points[(2 * i) % 5]);
81 }
82 fConcavePath.setFillType(SkPath::kEvenOdd_FillType);
83 SkASSERT(!fConcavePath.isConvex());
84 }
85 canvas->drawPath(fConcavePath, *paint);
86 break;
87 case kText_ShapeType: {
88 const char* text = "Hello!";
89 paint->setTextSize(30);
90 canvas->drawText(text, strlen(text), 0, 0, *paint);
91 }
92 default:
93 break;
94 }
95 }
96
97 static SkColor GetColor(SkRandom* random, int i) {
98 SkColor color;
99 switch (i) {
100 case 0:
101 color = SK_ColorTRANSPARENT;
102 break;
103 case 1:
104 color = SkColorSetARGB(0xff,
105 random->nextULessThan(256),
106 random->nextULessThan(256),
107 random->nextULessThan(256));
108 break;
109 default:
110 uint8_t alpha = random->nextULessThan(256);
111 color = SkColorSetARGB(alpha,
112 random->nextRangeU(0, alpha),
113 random->nextRangeU(0, alpha),
114 random->nextRangeU(0, alpha));
115 break;
116 }
117 return color;
118 }
119
120 static void SetStyle(SkPaint* p, int style, int width) {
121 switch (style) {
122 case 0:
123 p->setStyle(SkPaint::kStroke_Style);
124 p->setStrokeWidth((SkScalar)width);
125 break;
126 case 1:
127 p->setStyle(SkPaint::kStrokeAndFill_Style);
128 p->setStrokeWidth((SkScalar)width);
129 break;
130 default:
131 p->setStyle(SkPaint::kFill_Style);
132 break;
133 }
134 }
135
mtklein36352bf2015-03-25 18:17:31 -0700136 void onDraw(SkCanvas* canvas) override {
joshualitt5ce33c12015-01-28 11:08:00 -0800137 SkRandom random;
138 SkScalar y = 100;
139 for (int i = 0; i < kNumShapeTypes; i++) {
140 ShapeType shapeType = static_cast<ShapeType>(i);
141 SkScalar x = 25;
142 for (int style = 0; style < 3; style++) {
143 for (int width = 0; width <= 1; width++) {
144 for (int alpha = 0; alpha <= 2; alpha++) {
145 for (int r = 0; r <= 5; r++) {
146 SkColor color = GetColor(&random, alpha);
147
148 SkPaint p;
149 p.setAntiAlias(true);
150 p.setColor(color);
151 p.setXfermodeMode(r % 3 == 0 ? SkXfermode::kHardLight_Mode :
152 SkXfermode::kSrcOver_Mode);
153 SetStyle(&p, style, width);
154 canvas->save();
155 canvas->translate(x, y);
156 canvas->rotate((SkScalar)(r < 3 ? 10 : 0));
157 this->drawShape(canvas, &p, shapeType);
158 canvas->restore();
159 x += 8;
160 }
161 }
162 }
163 }
164 y += 50;
165 }
166 }
167
168private:
169 enum {
170 kNumShapes = 100,
171 };
172 SkAutoTUnref<SkShader> fBG;
173 SkPath fConcavePath;
174 SkPath fConvexPath;
175 static const int kWidth = 900;
176 static const int kHeight = 400;
177 typedef GM INHERITED;
178};
179
180//////////////////////////////////////////////////////////////////////////////
181
182static GM* MyFactory(void*) { return new DstReadShuffle; }
183static GMRegistry reg(MyFactory);
184
185}