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 random SkXfermode::Modes against a checkerboard.
18 */
19 class MixedXfermodesGM : public GM {
20 public:
MixedXfermodesGM()21 MixedXfermodesGM() {
22 }
23
24 protected:
onShortName()25 virtual SkString onShortName() SK_OVERRIDE {
26 return SkString("mixed_xfermodes");
27 }
28
onISize()29 virtual SkISize onISize() SK_OVERRIDE {
30 return make_isize(790, 640);
31 }
32
drawShape(SkCanvas * canvas,const SkPaint & paint,SkRandom * random)33 void drawShape(SkCanvas* canvas,
34 const SkPaint& paint,
35 SkRandom* random) {
36 static const SkRect kRect = SkRect::MakeXYWH(SkIntToScalar(-50), SkIntToScalar(-50),
37 SkIntToScalar(75), SkIntToScalar(105));
38 int shape = random->nextULessThan(5);
39 switch (shape) {
40 case 0:
41 canvas->drawCircle(0, 0, 50, paint);
42 break;
43 case 1:
44 canvas->drawRoundRect(kRect, SkIntToScalar(10), SkIntToScalar(20), paint);
45 break;
46 case 2:
47 canvas->drawRect(kRect, paint);
48 break;
49 case 3:
50 if (fConvexPath.isEmpty()) {
51 SkPoint points[4];
52 kRect.toQuad(points);
53 fConvexPath.moveTo(points[0]);
54 fConvexPath.quadTo(points[1], points[2]);
55 fConvexPath.quadTo(points[3], points[0]);
56 SkASSERT(fConvexPath.isConvex());
57 }
58 canvas->drawPath(fConvexPath, paint);
59 break;
60 case 4:
61 if (fConcavePath.isEmpty()) {
62 SkPoint points[5] = {{0, SkIntToScalar(-50)} };
63 SkMatrix rot;
64 rot.setRotate(SkIntToScalar(360) / 5);
65 for (int i = 1; i < 5; ++i) {
66 rot.mapPoints(points + i, points + i - 1, 1);
67 }
68 fConcavePath.moveTo(points[0]);
69 for (int i = 0; i < 5; ++i) {
70 fConcavePath.lineTo(points[(2 * i) % 5]);
71 }
72 fConcavePath.setFillType(SkPath::kEvenOdd_FillType);
73 SkASSERT(!fConcavePath.isConvex());
74 }
75 canvas->drawPath(fConcavePath, paint);
76 break;
77 }
78 }
79
onDraw(SkCanvas * canvas)80 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
81 if (NULL == fBG.get()) {
82 static uint32_t kCheckerPixelData[] = { 0xFFFFFFFF,
83 0xFFCCCCCC,
84 0xFFCCCCCC,
85 0xFFFFFFFF };
86 SkBitmap bitmap;
87 bitmap.setConfig(SkBitmap::kARGB_8888_Config, 2, 2, 2 * sizeof(uint32_t));
88 bitmap.allocPixels();
89 bitmap.lockPixels();
90 memcpy(bitmap.getPixels(), kCheckerPixelData, sizeof(kCheckerPixelData));
91 bitmap.unlockPixels();
92 fBG.reset(SkShader::CreateBitmapShader(bitmap,
93 SkShader::kRepeat_TileMode,
94 SkShader::kRepeat_TileMode));
95 }
96 SkMatrix lm;
97 lm.setScale(SkIntToScalar(20), SkIntToScalar(20));
98 fBG->setLocalMatrix(lm);
99
100 SkPaint bgPaint;
101 bgPaint.setShader(fBG.get());
102 canvas->drawPaint(bgPaint);
103 SkISize size = canvas->getDeviceSize();
104 SkScalar maxScale = SkScalarSqrt((SkIntToScalar(size.fWidth * size.fHeight))) / 300;
105 SkRandom random;
106 for (int i = 0; i < kNumShapes; ++i) {
107 SkScalar s = random.nextRangeScalar(SK_Scalar1 / 8, SK_Scalar1) * maxScale;
108 SkScalar r = random.nextRangeScalar(0, SkIntToScalar(360));
109 SkScalar dx = random.nextRangeScalar(0, SkIntToScalar(size.fWidth));
110 SkScalar dy = random.nextRangeScalar(0, SkIntToScalar(size.fHeight));
111 SkColor color = random.nextU();
112 SkXfermode::Mode mode =
113 static_cast<SkXfermode::Mode>(random.nextULessThan(SkXfermode::kLastMode + 1));
114
115 SkPaint p;
116 p.setAntiAlias(true);
117 p.setColor(color);
118 p.setXfermodeMode(mode);
119 canvas->save();
120 canvas->translate(dx, dy);
121 canvas->scale(s, s);
122 canvas->rotate(r);
123 this->drawShape(canvas, p, &random);
124 canvas->restore();
125 }
126 }
127
onGetFlags() const128 virtual uint32_t onGetFlags() const {
129 // Skip PDF rasterization since rendering this PDF takes forever.
130 return kSkipPDFRasterization_Flag;
131 }
132
133 private:
134 enum {
135 kNumShapes = 100,
136 };
137 SkAutoTUnref<SkShader> fBG;
138 SkPath fConcavePath;
139 SkPath fConvexPath;
140 typedef GM INHERITED;
141 };
142
143 //////////////////////////////////////////////////////////////////////////////
144
MyFactory(void *)145 static GM* MyFactory(void*) { return new MixedXfermodesGM; }
146 static GMRegistry reg(MyFactory);
147
148 }
149