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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrTemplates.h"
#include "SkGr.h"
#include "SkDescriptor.h"
#include "SkGlyphCache.h"
class SkGrDescKey : public GrKey {
public:
explicit SkGrDescKey(const SkDescriptor& desc);
virtual ~SkGrDescKey();
protected:
// overrides
virtual bool lt(const GrKey& rh) const;
virtual bool eq(const GrKey& rh) const;
private:
SkDescriptor* fDesc;
enum {
kMaxStorageInts = 16
};
uint32_t fStorage[kMaxStorageInts];
};
///////////////////////////////////////////////////////////////////////////////
SkGrDescKey::SkGrDescKey(const SkDescriptor& desc) : GrKey(desc.getChecksum()) {
size_t size = desc.getLength();
if (size <= sizeof(fStorage)) {
fDesc = GrTCast<SkDescriptor*>(fStorage);
} else {
fDesc = SkDescriptor::Alloc(size);
}
memcpy(fDesc, &desc, size);
}
SkGrDescKey::~SkGrDescKey() {
if (fDesc != GrTCast<SkDescriptor*>(fStorage)) {
SkDescriptor::Free(fDesc);
}
}
bool SkGrDescKey::lt(const GrKey& rh) const {
const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc;
size_t lenLH = fDesc->getLength();
size_t lenRH = srcDesc->getLength();
int cmp = memcmp(fDesc, srcDesc, SkMin32(lenLH, lenRH));
if (0 == cmp) {
return lenLH < lenRH;
} else {
return cmp < 0;
}
}
bool SkGrDescKey::eq(const GrKey& rh) const {
const SkDescriptor* srcDesc = ((const SkGrDescKey*)&rh)->fDesc;
return fDesc->equals(*srcDesc);
}
///////////////////////////////////////////////////////////////////////////////
SkGrFontScaler::SkGrFontScaler(SkGlyphCache* strike) {
fStrike = strike;
fKey = NULL;
}
SkGrFontScaler::~SkGrFontScaler() {
GrSafeUnref(fKey);
}
GrMaskFormat SkGrFontScaler::getMaskFormat() {
SkMask::Format format = fStrike->getMaskFormat();
switch (format) {
case SkMask::kBW_Format:
// fall through to kA8 -- we store BW glyphs in our 8-bit cache
case SkMask::kA8_Format:
return kA8_GrMaskFormat;
case SkMask::kLCD16_Format:
return kA565_GrMaskFormat;
case SkMask::kLCD32_Format:
return kA888_GrMaskFormat;
default:
GrAssert(!"unsupported SkMask::Format");
return kA8_GrMaskFormat;
}
}
const GrKey* SkGrFontScaler::getKey() {
if (NULL == fKey) {
fKey = SkNEW_ARGS(SkGrDescKey, (fStrike->getDescriptor()));
}
return fKey;
}
bool SkGrFontScaler::getPackedGlyphBounds(GrGlyph::PackedID packed,
GrIRect* bounds) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
GrGlyph::UnpackFixedX(packed),
GrGlyph::UnpackFixedY(packed));
bounds->setXYWH(glyph.fLeft, glyph.fTop, glyph.fWidth, glyph.fHeight);
return true;
}
namespace {
// expands each bit in a bitmask to 0 or ~0 of type INT_TYPE. Used to expand a BW glyph mask to
// A8, RGB565, or RGBA8888.
template <typename INT_TYPE>
void expand_bits(INT_TYPE* dst,
const uint8_t* src,
int width,
int height,
int dstRowBytes,
int srcRowBytes) {
for (int i = 0; i < height; ++i) {
int rowWritesLeft = width;
const uint8_t* s = src;
INT_TYPE* d = dst;
while (rowWritesLeft > 0) {
unsigned mask = *s++;
for (int i = 7; i >= 0 && rowWritesLeft; --i, --rowWritesLeft) {
*d++ = (mask & (1 << i)) ? (INT_TYPE)(~0UL) : 0;
}
}
dst = reinterpret_cast<INT_TYPE*>(reinterpret_cast<intptr_t>(dst) + dstRowBytes);
src += srcRowBytes;
}
}
}
bool SkGrFontScaler::getPackedGlyphImage(GrGlyph::PackedID packed,
int width, int height,
int dstRB, void* dst) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(GrGlyph::UnpackID(packed),
GrGlyph::UnpackFixedX(packed),
GrGlyph::UnpackFixedY(packed));
GrAssert(glyph.fWidth == width);
GrAssert(glyph.fHeight == height);
const void* src = fStrike->findImage(glyph);
if (NULL == src) {
return false;
}
int srcRB = glyph.rowBytes();
// The windows font host sometimes has BW glyphs in a non-BW strike. So it is important here to
// check the glyph's format, not the strike's format, and to be able to convert to any of the
// GrMaskFormats.
if (SkMask::kBW_Format == glyph.fMaskFormat) {
// expand bits to our mask type
const uint8_t* bits = reinterpret_cast<const uint8_t*>(src);
switch (this->getMaskFormat()) {
case kA8_GrMaskFormat:{
uint8_t* bytes = reinterpret_cast<uint8_t*>(dst);
expand_bits(bytes, bits, width, height, dstRB, srcRB);
break;
}
case kA565_GrMaskFormat: {
uint16_t* rgb565 = reinterpret_cast<uint16_t*>(dst);
expand_bits(rgb565, bits, width, height, dstRB, srcRB);
break;
}
case kA888_GrMaskFormat: {
uint32_t* rgba8888 = reinterpret_cast<uint32_t*>(dst);
expand_bits(rgba8888, bits, width, height, dstRB, srcRB);
break;
}
default:
GrCrash("Unknown GrMaskFormat");
}
} else if (srcRB == dstRB) {
memcpy(dst, src, dstRB * height);
} else {
const int bbp = GrMaskFormatBytesPerPixel(this->getMaskFormat());
for (int y = 0; y < height; y++) {
memcpy(dst, src, width * bbp);
src = (const char*)src + srcRB;
dst = (char*)dst + dstRB;
}
}
return true;
}
// we should just return const SkPath* (NULL means false)
bool SkGrFontScaler::getGlyphPath(uint16_t glyphID, SkPath* path) {
const SkGlyph& glyph = fStrike->getGlyphIDMetrics(glyphID);
const SkPath* skPath = fStrike->findPath(glyph);
if (skPath) {
*path = *skPath;
return true;
}
return false;
}
|
