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
|
/*
* 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 "SkPerlinNoiseShader.h"
class PerlinNoiseGM : public skiagm::GM {
public:
PerlinNoiseGM() {
this->setBGColor(0xFF000000);
fSize = SkISize::Make(80, 80);
}
protected:
virtual SkString onShortName() {
return SkString("perlinnoise");
}
virtual SkISize onISize() {
return SkISize::Make(200, 500);
}
void drawClippedRect(SkCanvas* canvas, int x, int y, const SkPaint& paint) {
canvas->save();
canvas->clipRect(SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(fSize.width()), SkIntToScalar(fSize.height())));
SkRect r = SkRect::MakeXYWH(SkIntToScalar(x), SkIntToScalar(y),
SkIntToScalar(fSize.width()),
SkIntToScalar(fSize.height()));
canvas->drawRect(r, paint);
canvas->restore();
}
void test(SkCanvas* canvas, int x, int y, SkPerlinNoiseShader::Type type,
float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
bool stitchTiles) {
SkShader* shader = (type == SkPerlinNoiseShader::kFractalNoise_Type) ?
SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL) :
SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL);
SkPaint paint;
paint.setShader(shader)->unref();
drawClippedRect(canvas, x, y, paint);
}
virtual void onDraw(SkCanvas* canvas) {
canvas->clear(0x00000000);
test(canvas, 0, 0, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 0, 0, false);
test(canvas, 100, 0, SkPerlinNoiseShader::kTurbulence_Type,
0.1f, 0.1f, 0, 0, false);
test(canvas, 0, 100, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 2, 0, false);
test(canvas, 100, 100, SkPerlinNoiseShader::kFractalNoise_Type,
0.2f, 0.4f, 5, 0, true);
test(canvas, 0, 200, SkPerlinNoiseShader::kTurbulence_Type,
0.1f, 0.1f, 2, 0, true);
test(canvas, 100, 200, SkPerlinNoiseShader::kTurbulence_Type,
0.2f, 0.4f, 5, 0, false);
test(canvas, 0, 300, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 3, 1, false);
test(canvas, 100, 300, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 3, 4, false);
canvas->scale(0.75f, 1.0f);
test(canvas, 0, 400, SkPerlinNoiseShader::kFractalNoise_Type,
0.1f, 0.1f, 2, 0, false);
test(canvas, 100, 400, SkPerlinNoiseShader::kFractalNoise_Type,
0.2f, 0.4f, 5, 0, true);
}
private:
typedef GM INHERITED;
SkISize fSize;
};
class PerlinNoiseGM2 : public skiagm::GM {
public:
PerlinNoiseGM2() {
fSize = SkISize::Make(80, 80);
}
protected:
virtual SkString onShortName() {
return SkString("perlinnoise_localmatrix");
}
virtual SkISize onISize() {
return SkISize::Make(640, 480);
}
void install(SkPaint* paint, SkPerlinNoiseShader::Type type,
float baseFrequencyX, float baseFrequencyY, int numOctaves, float seed,
bool stitchTiles) {
SkShader* shader = (type == SkPerlinNoiseShader::kFractalNoise_Type) ?
SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL) :
SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves,
seed, stitchTiles ? &fSize : NULL);
paint->setShader(shader)->unref();
}
virtual void onDraw(SkCanvas* canvas) {
canvas->translate(10, 10);
SkPaint paint;
install(&paint, SkPerlinNoiseShader::kFractalNoise_Type, 0.1f, 0.1f, 2, 0, false);
const SkScalar w = SkIntToScalar(fSize.width());
const SkScalar h = SkIntToScalar(fSize.height());
SkRect r = SkRect::MakeWH(w, h);
canvas->drawRect(r, paint);
canvas->save();
canvas->translate(w * 5/4, 0);
canvas->drawRect(r, paint);
canvas->restore();
canvas->save();
canvas->translate(0, h + 10);
canvas->scale(2, 2);
canvas->drawRect(r, paint);
canvas->restore();
canvas->save();
canvas->translate(w + 100, h + 10);
canvas->scale(2, 2);
canvas->drawRect(r, paint);
canvas->restore();
// The next row should draw the same as the previous, even though we are using a local
// matrix instead of the canvas.
canvas->translate(0, h * 2 + 10);
SkMatrix lm;
lm.setScale(2, 2);
paint.setShader(SkShader::CreateLocalMatrixShader(paint.getShader(), lm))->unref();
r.fRight += r.width();
r.fBottom += r.height();
canvas->save();
canvas->translate(0, h + 10);
canvas->drawRect(r, paint);
canvas->restore();
canvas->save();
canvas->translate(w + 100, h + 10);
canvas->drawRect(r, paint);
canvas->restore();
}
private:
typedef GM INHERITED;
SkISize fSize;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM( return new PerlinNoiseGM; )
DEF_GM( return new PerlinNoiseGM2; )
|
