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1 | |
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 | |
14 namespace skiagm { | |
15 | |
16 /** | |
17 * Renders overlapping shapes with colorburn against a checkerboard. | |
18 */ | |
19 class DstReadShuffle : public GM { | |
20 public: | |
21 DstReadShuffle() { | |
22 this->setBGColor(SkColorSetARGB(0xff, 0xff, 0, 0xff)); | |
23 } | |
24 | |
25 protected: | |
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 | |
36 SkString onShortName() SK_OVERRIDE { | |
37 return SkString("dstreadshuffle"); | |
38 } | |
39 | |
40 SkISize onISize() SK_OVERRIDE { | |
41 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), SkIntTo
Scalar(-50), | |
48 SkIntToScalar(75), SkIntToS
calar(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 | |
136 void onDraw(SkCanvas* canvas) SK_OVERRIDE { | |
137 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::kHardLigh
t_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 | |
168 private: | |
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 | |
182 static GM* MyFactory(void*) { return new DstReadShuffle; } | |
183 static GMRegistry reg(MyFactory); | |
184 | |
185 } | |
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