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
|
#include "SampleCode.h"
#include "SkBlurMaskFilter.h"
#include "SkColorPriv.h"
#include "SkGradientShader.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkUtils.h"
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
class BlurView : public SkView {
SkBitmap fBM;
public:
BlurView() {
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Blur");
return true;
}
return this->INHERITED::onQuery(evt);
}
void drawBG(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
}
virtual void onDraw(SkCanvas* canvas) {
drawBG(canvas);
SkBlurMaskFilter::BlurStyle NONE = SkBlurMaskFilter::BlurStyle(-999);
static const struct {
SkBlurMaskFilter::BlurStyle fStyle;
int fCx, fCy;
} gRecs[] = {
{ NONE, 0, 0 },
{ SkBlurMaskFilter::kInner_BlurStyle, -1, 0 },
{ SkBlurMaskFilter::kNormal_BlurStyle, 0, 1 },
{ SkBlurMaskFilter::kSolid_BlurStyle, 0, -1 },
{ SkBlurMaskFilter::kOuter_BlurStyle, 1, 0 },
};
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorBLUE);
for (size_t i = 0; i < SK_ARRAY_COUNT(gRecs); i++) {
if (gRecs[i].fStyle != NONE) {
SkMaskFilter* mf = SkBlurMaskFilter::Create(20, gRecs[i].fStyle);
paint.setMaskFilter(mf)->unref();
} else {
paint.setMaskFilter(NULL);
}
canvas->drawCircle(200 + gRecs[i].fCx*100,
200 + gRecs[i].fCy*100, 50, paint);
}
}
private:
typedef SkView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new BlurView; }
static SkViewRegister reg(MyFactory);
|
