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
|
/*
* 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 "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkFont.h"
#include "include/core/SkGraphics.h"
#include "include/core/SkPath.h"
#include "include/core/SkRegion.h"
#include "include/core/SkShader.h"
#include "include/core/SkTime.h"
#include "include/core/SkTypeface.h"
#include "include/effects/SkCornerPathEffect.h"
#include "include/effects/SkGradientShader.h"
#include "include/utils/SkRandom.h"
#include "include/utils/SkTextUtils.h"
#include "samplecode/Sample.h"
#include "src/core/SkBlurMask.h"
#include "src/utils/SkUTF.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkStream.h"
static void setNamedTypeface(SkFont* font, const char name[]) {
font->setTypeface(SkTypeface::MakeFromName(name, SkFontStyle()));
}
static uint16_t gBG[] = { 0xFFFF, 0xCCCF, 0xCCCF, 0xFFFF };
class XfermodesBlurView : public Sample {
SkBitmap fBG;
SkBitmap fSrcB, fDstB;
void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) {
SkPaint p;
p.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(5)));
SkScalar ww = SkIntToScalar(W);
SkScalar hh = SkIntToScalar(H);
// draw a circle covering the upper
// left three quarters of the canvas
p.setColor(0xFFCC44FF);
SkRect r;
r.setLTRB(0, 0, ww*3/4, hh*3/4);
r.offset(x, y);
canvas->drawOval(r, p);
p.setBlendMode(mode);
// draw a square overlapping the circle
// in the lower right of the canvas
p.setColor(0x00AA6633 | alpha << 24);
r.setLTRB(ww/3, hh/3, ww*19/20, hh*19/20);
r.offset(x, y);
canvas->drawRect(r, p);
}
public:
const static int W = 64;
const static int H = 64;
XfermodesBlurView() {
fBG.installPixels(SkImageInfo::Make(2, 2, kARGB_4444_SkColorType, kPremul_SkAlphaType),
gBG, 4);
}
protected:
SkString name() override { return SkString("XfermodesBlur"); }
void onDrawContent(SkCanvas* canvas) override {
canvas->translate(SkIntToScalar(10), SkIntToScalar(20));
const SkBlendMode gModes[] = {
SkBlendMode::kClear,
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
SkBlendMode::kSrcOut,
SkBlendMode::kDstOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kXor,
SkBlendMode::kPlus,
};
const SkScalar w = SkIntToScalar(W);
const SkScalar h = SkIntToScalar(H);
SkMatrix m;
m.setScale(SkIntToScalar(6), SkIntToScalar(6));
auto s = fBG.makeShader(SkTileMode::kRepeat, SkTileMode::kRepeat, SkSamplingOptions(), m);
SkFont font;
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
setNamedTypeface(&font, "Menlo Regular");
const int kWrap = 5;
SkScalar x0 = 0;
for (int twice = 0; twice < 2; twice++) {
SkScalar x = x0, y = 0;
for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) {
SkRect r;
r.setLTRB(x, y, x+w, y+h);
SkPaint p;
p.setStyle(SkPaint::kFill_Style);
p.setShader(s);
canvas->drawRect(r, p);
canvas->saveLayer(&r, nullptr);
draw_mode(canvas, gModes[i], twice ? 0x88 : 0xFF, r.fLeft, r.fTop);
canvas->restore();
r.inset(-SK_ScalarHalf, -SK_ScalarHalf);
p.setStyle(SkPaint::kStroke_Style);
p.setShader(nullptr);
canvas->drawRect(r, p);
const char* label = SkBlendMode_Name(gModes[i]);
SkTextUtils::DrawString(canvas, label, x + w/2, y - font.getSize()/2, font, SkPaint(),
SkTextUtils::kCenter_Align);
x += w + SkIntToScalar(10);
if ((i % kWrap) == kWrap - 1) {
x = x0;
y += h + SkIntToScalar(30);
}
}
x0 += SkIntToScalar(400);
}
}
private:
using INHERITED = Sample;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new XfermodesBlurView(); )
|
