1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkBitmap.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkShader.h"
#include "SkXfermode.h"
namespace skiagm {
/**
* Renders overlapping shapes with colorburn against a checkerboard.
*/
class DstReadShuffle : public GM {
public:
DstReadShuffle() {
this->setBGColor(SkColorSetARGB(0xff, 0xff, 0, 0xff));
}
protected:
enum ShapeType {
kCircle_ShapeType,
kRoundRect_ShapeType,
kRect_ShapeType,
kConvexPath_ShapeType,
kConcavePath_ShapeType,
kText_ShapeType,
kNumShapeTypes
};
SkString onShortName() override {
return SkString("dstreadshuffle");
}
SkISize onISize() override {
return SkISize::Make(kWidth, kHeight);
}
void drawShape(SkCanvas* canvas,
SkPaint* paint,
ShapeType type) {
const SkRect kRect = SkRect::MakeXYWH(SkIntToScalar(-50), SkIntToScalar(-50),
SkIntToScalar(75), SkIntToScalar(105));
switch (type) {
case kCircle_ShapeType:
canvas->drawCircle(0, 0, 50, *paint);
break;
case kRoundRect_ShapeType:
canvas->drawRoundRect(kRect, SkIntToScalar(10), SkIntToScalar(20), *paint);
break;
case kRect_ShapeType:
canvas->drawRect(kRect, *paint);
break;
case kConvexPath_ShapeType:
if (fConvexPath.isEmpty()) {
SkPoint points[4];
kRect.toQuad(points);
fConvexPath.moveTo(points[0]);
fConvexPath.quadTo(points[1], points[2]);
fConvexPath.quadTo(points[3], points[0]);
SkASSERT(fConvexPath.isConvex());
}
canvas->drawPath(fConvexPath, *paint);
break;
case kConcavePath_ShapeType:
if (fConcavePath.isEmpty()) {
SkPoint points[5] = {{0, SkIntToScalar(-50)} };
SkMatrix rot;
rot.setRotate(SkIntToScalar(360) / 5);
for (int i = 1; i < 5; ++i) {
rot.mapPoints(points + i, points + i - 1, 1);
}
fConcavePath.moveTo(points[0]);
for (int i = 0; i < 5; ++i) {
fConcavePath.lineTo(points[(2 * i) % 5]);
}
fConcavePath.setFillType(SkPath::kEvenOdd_FillType);
SkASSERT(!fConcavePath.isConvex());
}
canvas->drawPath(fConcavePath, *paint);
break;
case kText_ShapeType: {
const char* text = "Hello!";
paint->setTextSize(30);
sk_tool_utils::set_portable_typeface(paint);
canvas->drawText(text, strlen(text), 0, 0, *paint);
}
default:
break;
}
}
static SkColor GetColor(SkRandom* random, int i, int nextColor) {
static SkColor colors[] = { SK_ColorRED,
sk_tool_utils::color_to_565(0xFFFF7F00), // Orange
SK_ColorYELLOW,
SK_ColorGREEN,
SK_ColorBLUE,
sk_tool_utils::color_to_565(0xFF4B0082), // indigo
sk_tool_utils::color_to_565(0xFF7F00FF) }; // violet
SkColor color;
int index = nextColor % SK_ARRAY_COUNT(colors);
switch (i) {
case 0:
color = SK_ColorTRANSPARENT;
break;
case 1:
color = SkColorSetARGB(0xff,
SkColorGetR(colors[index]),
SkColorGetG(colors[index]),
SkColorGetB(colors[index]));
break;
default:
uint8_t alpha = 0x80;
color = SkColorSetARGB(alpha,
SkColorGetR(colors[index]),
SkColorGetG(colors[index]),
SkColorGetB(colors[index]));
break;
}
return color;
}
static void SetStyle(SkPaint* p, int style, int width) {
switch (style) {
case 0:
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeWidth((SkScalar)width);
break;
case 1:
p->setStyle(SkPaint::kStrokeAndFill_Style);
p->setStrokeWidth((SkScalar)width);
break;
default:
p->setStyle(SkPaint::kFill_Style);
break;
}
}
void onDraw(SkCanvas* canvas) override {
SkRandom random;
SkScalar y = 100;
for (int i = 0; i < kNumShapeTypes; i++) {
ShapeType shapeType = static_cast<ShapeType>(i);
SkScalar x = 25;
for (int style = 0; style < 3; style++) {
for (int width = 0; width <= 1; width++) {
for (int alpha = 0; alpha <= 2; alpha++) {
for (int r = 0; r <= 5; r++) {
SkColor color = GetColor(&random, alpha, style + width + alpha + r);
SkPaint p;
p.setAntiAlias(true);
p.setColor(color);
// In order to get some batching on the GPU backend we do 2 src over for
// each xfer mode which requires a dst read
p.setBlendMode(r % 3 == 0 ? SkBlendMode::kLighten :
SkBlendMode::kSrcOver);
SetStyle(&p, style, width);
canvas->save();
canvas->translate(x, y);
canvas->rotate((SkScalar)(r < 3 ? 10 : 0));
this->drawShape(canvas, &p, shapeType);
canvas->restore();
x += 8;
}
}
}
}
y += 50;
}
}
private:
enum {
kNumShapes = 100,
};
sk_sp<SkShader> fBG;
SkPath fConcavePath;
SkPath fConvexPath;
static constexpr int kWidth = 900;
static constexpr int kHeight = 400;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new DstReadShuffle; }
static GMRegistry reg(MyFactory);
}
|
