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
|
#include "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkTypeface.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "Sk1DPathEffect.h"
#include "SkCornerPathEffect.h"
#include "SkPathMeasure.h"
#include "SkRandom.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkDither.h"
#include "SkTypefaceCache.h"
static int dither_4444(int x) {
return ((x << 1) - ((x >> 4 << 4) | (x >> 4))) >> 4;
}
/** Ensure that the max of the original and dithered value (for alpha) is always
>= any other dithered value. We apply this "max" in colorpriv.h when we
predither down to 4444, to be sure that we stay in legal premultiplied form
*/
static void test_4444_dither() {
int buckets[16];
sk_bzero(buckets, sizeof(buckets));
for (int a = 0; a <= 0xFF; a++) {
int da = dither_4444(a);
int maxa = SkMax32(a >> 4, da);
// SkDebugf("--- %02X %X\n", a, da);
buckets[da] += 1;
for (int c = 0; c <= a; c++) {
int dc = dither_4444(c);
if (maxa < dc) {
SkDebugf("------------ error a=%d da=%d c=%d dc=%d\n", a, da,
c, dc);
}
}
}
for (int i = 0; i < 16; i++) {
// SkDebugf("[%d] = %d\n", i, buckets[i]);
}
}
static const struct {
const char* fName;
SkTypeface::Style fStyle;
} gFaces[] = {
{ "sans-serif", SkTypeface::kNormal },
{ "sans-serif", SkTypeface::kBold },
{ "sans-serif", SkTypeface::kItalic },
{ "sans-serif", SkTypeface::kBoldItalic },
{ "serif", SkTypeface::kNormal },
{ "serif", SkTypeface::kBold },
{ "serif", SkTypeface::kItalic },
{ "serif", SkTypeface::kBoldItalic },
{ "monospace", SkTypeface::kNormal },
{ "monospace", SkTypeface::kBold },
{ "monospace", SkTypeface::kItalic },
{ "monospace", SkTypeface::kBoldItalic },
};
static const int gFaceCount = SK_ARRAY_COUNT(gFaces);
class TypefaceView : public SampleView {
SkTypeface* fFaces[gFaceCount];
public:
TypefaceView() {
test_4444_dither();
for (int i = 0; i < gFaceCount; i++) {
fFaces[i] = SkTypeface::CreateFromName(gFaces[i].fName,
gFaces[i].fStyle);
}
this->setBGColor(0xFFDDDDDD);
}
virtual ~TypefaceView() {
for (int i = 0; i < gFaceCount; i++) {
SkSafeUnref(fFaces[i]);
}
SkTypefaceCache::Dump();
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Typefaces");
return true;
}
return this->INHERITED::onQuery(evt);
}
virtual void onDrawContent(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(SkIntToScalar(30));
const char* text = "Hamburgefons";
const size_t textLen = strlen(text);
SkScalar x = SkIntToScalar(10);
SkScalar dy = paint.getFontMetrics(NULL);
SkScalar y = dy;
paint.setLinearText(true);
for (int i = 0; i < gFaceCount; i++) {
paint.setTypeface(fFaces[i]);
canvas->drawText(text, textLen, x, y, paint);
y += dy;
}
}
private:
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new TypefaceView; }
static SkViewRegister reg(MyFactory);
|
