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
|
/*
* 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 "SkTableMaskFilter.h"
#include "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkString.h"
SkTableMaskFilter::SkTableMaskFilter() {
for (int i = 0; i < 256; i++) {
fTable[i] = i;
}
}
SkTableMaskFilter::SkTableMaskFilter(const uint8_t table[256]) {
memcpy(fTable, table, sizeof(fTable));
}
SkTableMaskFilter::~SkTableMaskFilter() {}
bool SkTableMaskFilter::filterMask(SkMask* dst, const SkMask& src,
const SkMatrix&, SkIPoint* margin) const {
if (src.fFormat != SkMask::kA8_Format) {
return false;
}
dst->fBounds = src.fBounds;
dst->fRowBytes = SkAlign4(dst->fBounds.width());
dst->fFormat = SkMask::kA8_Format;
dst->fImage = NULL;
if (src.fImage) {
dst->fImage = SkMask::AllocImage(dst->computeImageSize());
const uint8_t* srcP = src.fImage;
uint8_t* dstP = dst->fImage;
const uint8_t* table = fTable;
int dstWidth = dst->fBounds.width();
int extraZeros = dst->fRowBytes - dstWidth;
for (int y = dst->fBounds.height() - 1; y >= 0; --y) {
for (int x = dstWidth - 1; x >= 0; --x) {
dstP[x] = table[srcP[x]];
}
srcP += src.fRowBytes;
// we can't just inc dstP by rowbytes, because if it has any
// padding between its width and its rowbytes, we need to zero those
// so that the bitters can read those safely if that is faster for
// them
dstP += dstWidth;
for (int i = extraZeros - 1; i >= 0; --i) {
*dstP++ = 0;
}
}
}
if (margin) {
margin->set(0, 0);
}
return true;
}
SkMask::Format SkTableMaskFilter::getFormat() const {
return SkMask::kA8_Format;
}
void SkTableMaskFilter::flatten(SkWriteBuffer& wb) const {
wb.writeByteArray(fTable, 256);
}
SkFlattenable* SkTableMaskFilter::CreateProc(SkReadBuffer& buffer) {
uint8_t table[256];
if (!buffer.readByteArray(table, 256)) {
return NULL;
}
return Create(table);
}
///////////////////////////////////////////////////////////////////////////////
void SkTableMaskFilter::MakeGammaTable(uint8_t table[256], SkScalar gamma) {
const float dx = 1 / 255.0f;
const float g = SkScalarToFloat(gamma);
float x = 0;
for (int i = 0; i < 256; i++) {
// float ee = powf(x, g) * 255;
table[i] = SkPin32(sk_float_round2int(powf(x, g) * 255), 0, 255);
x += dx;
}
}
void SkTableMaskFilter::MakeClipTable(uint8_t table[256], uint8_t min,
uint8_t max) {
if (0 == max) {
max = 1;
}
if (min >= max) {
min = max - 1;
}
SkASSERT(min < max);
SkFixed scale = (1 << 16) * 255 / (max - min);
memset(table, 0, min + 1);
for (int i = min + 1; i < max; i++) {
int value = SkFixedRoundToInt(scale * (i - min));
SkASSERT(value <= 255);
table[i] = value;
}
memset(table + max, 255, 256 - max);
#if 0
int j;
for (j = 0; j < 256; j++) {
if (table[j]) {
break;
}
}
SkDebugf("%d %d start [%d]", min, max, j);
for (; j < 256; j++) {
SkDebugf(" %d", table[j]);
}
SkDebugf("\n\n");
#endif
}
#ifndef SK_IGNORE_TO_STRING
void SkTableMaskFilter::toString(SkString* str) const {
str->append("SkTableMaskFilter: (");
str->append("table: ");
for (int i = 0; i < 255; ++i) {
str->appendf("%d, ", fTable[i]);
}
str->appendf("%d", fTable[255]);
str->append(")");
}
#endif
|
