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
|
/*
* Copyright 2015 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 "SkGradientShader.h"
#include "SkImage.h"
#include "SkPath.h"
#include "SkSurface.h"
static SkImage* make_image(SkCanvas* origCanvas, int w, int h) {
SkImageInfo info = SkImageInfo::MakeN32Premul(w, h);
SkAutoTUnref<SkSurface> surface(origCanvas->newSurface(info));
if (nullptr == surface) {
surface.reset(SkSurface::NewRaster(info));
}
SkCanvas* canvas = surface->getCanvas();
sk_tool_utils::draw_checkerboard(canvas, SK_ColorRED, SK_ColorGREEN, w/10);
return surface->newImageSnapshot();
}
namespace skiagm {
class PerspShadersGM : public GM {
public:
PerspShadersGM(bool doAA) : fDoAA(doAA) { }
protected:
SkString onShortName() override {
SkString name;
name.printf("persp_shaders_%s",
fDoAA ? "aa" : "bw");
return name;
}
SkISize onISize() override {
return SkISize::Make(kCellSize*kNumCols, kCellSize*kNumRows);
}
void onOnceBeforeDraw() override {
fBitmap = sk_tool_utils::create_checkerboard_bitmap(kCellSize, kCellSize,
SK_ColorBLUE, SK_ColorYELLOW,
kCellSize/10);
fBitmapShader.reset(SkShader::CreateBitmapShader(fBitmap,
SkShader::kClamp_TileMode,
SkShader::kClamp_TileMode));
SkPoint pts1[] = {
{ 0, 0 },
{ SkIntToScalar(kCellSize), SkIntToScalar(kCellSize) }
};
SkPoint pts2[] = {
{ 0, 0 },
{ 0, SkIntToScalar(kCellSize) }
};
static const SkColor colors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorRED, SK_ColorGREEN, SK_ColorRED
};
static const SkScalar pos[] = { 0, 0.25f, 0.5f, 0.75f, SK_Scalar1 };
fLinearGrad1.reset(SkGradientShader::CreateLinear(pts1, colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode));
fLinearGrad2.reset(SkGradientShader::CreateLinear(pts2, colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode));
fPerspMatrix.reset();
fPerspMatrix.setPerspY(SK_Scalar1 / 50);
fPath.moveTo(0, 0);
fPath.lineTo(0, SkIntToScalar(kCellSize));
fPath.lineTo(kCellSize/2.0f, kCellSize/2.0f);
fPath.lineTo(SkIntToScalar(kCellSize), SkIntToScalar(kCellSize));
fPath.lineTo(SkIntToScalar(kCellSize), 0);
fPath.close();
}
void drawRow(SkCanvas* canvas, SkFilterQuality filterQ) {
SkPaint filterPaint;
filterPaint.setFilterQuality(filterQ);
filterPaint.setAntiAlias(fDoAA);
SkPaint pathPaint;
pathPaint.setShader(fBitmapShader);
pathPaint.setFilterQuality(filterQ);
pathPaint.setAntiAlias(fDoAA);
SkPaint gradPaint1;
gradPaint1.setShader(fLinearGrad1);
gradPaint1.setAntiAlias(fDoAA);
SkPaint gradPaint2;
gradPaint2.setShader(fLinearGrad2);
gradPaint2.setAntiAlias(fDoAA);
SkRect r = SkRect::MakeWH(SkIntToScalar(kCellSize), SkIntToScalar(kCellSize));
canvas->save();
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawBitmapRect(fBitmap, r, &filterPaint);
canvas->restore();
canvas->translate(SkIntToScalar(kCellSize), 0);
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawImage(fImage, 0, 0, &filterPaint);
canvas->restore();
canvas->translate(SkIntToScalar(kCellSize), 0);
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawRect(r, pathPaint);
canvas->restore();
canvas->translate(SkIntToScalar(kCellSize), 0);
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawPath(fPath, pathPaint);
canvas->restore();
canvas->translate(SkIntToScalar(kCellSize), 0);
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawRect(r, gradPaint1);
canvas->restore();
canvas->translate(SkIntToScalar(kCellSize), 0);
canvas->save();
canvas->concat(fPerspMatrix);
canvas->drawPath(fPath, gradPaint2);
canvas->restore();
canvas->restore();
}
void onDraw(SkCanvas* canvas) override {
if (!fImage) {
fImage.reset(make_image(canvas, kCellSize, kCellSize));
}
this->drawRow(canvas, kNone_SkFilterQuality);
canvas->translate(0, SkIntToScalar(kCellSize));
this->drawRow(canvas, kLow_SkFilterQuality);
canvas->translate(0, SkIntToScalar(kCellSize));
this->drawRow(canvas, kMedium_SkFilterQuality);
canvas->translate(0, SkIntToScalar(kCellSize));
this->drawRow(canvas, kHigh_SkFilterQuality);
canvas->translate(0, SkIntToScalar(kCellSize));
}
private:
static const int kCellSize = 50;
static const int kNumRows = 4;
static const int kNumCols = 6;
bool fDoAA;
SkPath fPath;
SkAutoTUnref<SkShader> fBitmapShader;
SkAutoTUnref<SkShader> fLinearGrad1;
SkAutoTUnref<SkShader> fLinearGrad2;
SkMatrix fPerspMatrix;
SkAutoTUnref<SkImage> fImage;
SkBitmap fBitmap;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new PerspShadersGM(true);)
DEF_GM(return new PerspShadersGM(false);)
}
|
