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
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkUnitMappers.h"
static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
bm->setConfig(config, w, h);
bm->allocPixels();
bm->eraseColor(0);
SkCanvas canvas(*bm);
SkScalar s = SkIntToScalar(w < h ? w : h);
SkPoint pts[] = { { 0, 0 }, { s, s } };
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
SkScalar pos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
SkPaint paint;
SkUnitMapper* um = NULL;
um = new SkCosineMapper;
SkAutoUnref au(um);
paint.setDither(true);
paint.setShader(SkGradientShader::CreateLinear(pts, colors, pos,
SK_ARRAY_COUNT(colors), SkShader::kClamp_TileMode, um))->unref();
canvas.drawPaint(paint);
}
static SkShader* MakeBitmapShader(SkShader::TileMode tx, SkShader::TileMode ty,
int w, int h) {
static SkBitmap bmp;
if (bmp.isNull()) {
makebm(&bmp, SkBitmap::kARGB_8888_Config, w/2, h/4);
}
return SkShader::CreateBitmapShader(bmp, tx, ty);
}
///////////////////////////////////////////////////////////////////////////////
struct GradData {
int fCount;
const SkColor* fColors;
const SkScalar* fPos;
};
static const SkColor gColors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
};
static const GradData gGradData[] = {
{ 2, gColors, NULL },
{ 5, gColors, NULL },
};
static SkShader* MakeLinear(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
return SkGradientShader::CreateLinear(pts, data.fColors, data.fPos,
data.fCount, tm, mapper);
}
static SkShader* MakeRadial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateRadial(center, center.fX, data.fColors,
data.fPos, data.fCount, tm, mapper);
}
static SkShader* MakeSweep(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center;
center.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
return SkGradientShader::CreateSweep(center.fX, center.fY, data.fColors,
data.fPos, data.fCount, mapper);
}
static SkShader* Make2Radial(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper) {
SkPoint center0, center1;
center0.set(SkScalarAve(pts[0].fX, pts[1].fX),
SkScalarAve(pts[0].fY, pts[1].fY));
center1.set(SkScalarInterp(pts[0].fX, pts[1].fX, SkIntToScalar(3)/5),
SkScalarInterp(pts[0].fY, pts[1].fY, SkIntToScalar(1)/4));
return SkGradientShader::CreateTwoPointRadial(
center1, (pts[1].fX - pts[0].fX) / 7,
center0, (pts[1].fX - pts[0].fX) / 2,
data.fColors, data.fPos, data.fCount, tm, mapper);
}
typedef SkShader* (*GradMaker)(const SkPoint pts[2], const GradData& data,
SkShader::TileMode tm, SkUnitMapper* mapper);
static const GradMaker gGradMakers[] = {
MakeLinear, MakeRadial, MakeSweep, Make2Radial
};
///////////////////////////////////////////////////////////////////////////////
class ShaderTextView : public SampleView {
public:
ShaderTextView() {
this->setBGColor(0xFFDDDDDD);
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Shader Text");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
const char text[] = "Shaded Text";
const int textLen = SK_ARRAY_COUNT(text) - 1;
static int pointSize = 36;
int w = pointSize * textLen;
int h = pointSize;
SkPoint pts[2] = {
{ 0, 0 },
{ SkIntToScalar(w), SkIntToScalar(h) }
};
SkScalar textBase = SkIntToScalar(h/2);
SkShader::TileMode tileModes[] = {
SkShader::kClamp_TileMode,
SkShader::kRepeat_TileMode,
SkShader::kMirror_TileMode
};
static const int gradCount = SK_ARRAY_COUNT(gGradData) *
SK_ARRAY_COUNT(gGradMakers);
static const int bmpCount = SK_ARRAY_COUNT(tileModes) *
SK_ARRAY_COUNT(tileModes);
SkShader* shaders[gradCount + bmpCount];
int shdIdx = 0;
for (size_t d = 0; d < SK_ARRAY_COUNT(gGradData); ++d) {
for (size_t m = 0; m < SK_ARRAY_COUNT(gGradMakers); ++m) {
shaders[shdIdx++] = gGradMakers[m](pts,
gGradData[d],
SkShader::kClamp_TileMode,
NULL);
}
}
for (size_t tx = 0; tx < SK_ARRAY_COUNT(tileModes); ++tx) {
for (size_t ty = 0; ty < SK_ARRAY_COUNT(tileModes); ++ty) {
shaders[shdIdx++] = MakeBitmapShader(tileModes[tx],
tileModes[ty],
w/8, h);
}
}
SkPaint paint;
paint.setDither(true);
paint.setAntiAlias(true);
paint.setTextSize(SkIntToScalar(pointSize));
canvas->save();
canvas->translate(SkIntToScalar(20), SkIntToScalar(10));
SkPath path;
path.arcTo(SkRect::MakeXYWH(SkIntToScalar(-40), SkIntToScalar(15),
SkIntToScalar(300), SkIntToScalar(90)),
SkIntToScalar(225), SkIntToScalar(90),
false);
path.close();
static const int testsPerCol = 8;
static const int rowHeight = 60;
static const int colWidth = 300;
canvas->save();
for (size_t s = 0; s < SK_ARRAY_COUNT(shaders); s++) {
canvas->save();
int i = 2*s;
canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
SkIntToScalar((i % testsPerCol) * rowHeight));
paint.setShader(shaders[s])->unref();
canvas->drawText(text, textLen, 0, textBase, paint);
canvas->restore();
canvas->save();
++i;
canvas->translate(SkIntToScalar((i / testsPerCol) * colWidth),
SkIntToScalar((i % testsPerCol) * rowHeight));
canvas->drawTextOnPath(text, textLen, path, NULL, paint);
canvas->restore();
}
canvas->restore();
canvas->translate(0, SkIntToScalar(370));
this->inval(NULL);
}
private:
typedef SampleView INHERITED;
};
///////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new ShaderTextView; }
static SkViewRegister reg(MyFactory);
|
