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
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCanvas.h"
#include "SkDescriptor.h"
#include "SkGScalerContext.h"
#include "SkGlyph.h"
#include "SkPaintPriv.h"
#include "SkPath.h"
#include "SkMakeUnique.h"
#define STD_SIZE 1
class SkGScalerContext : public SkScalerContext {
public:
SkGScalerContext(sk_sp<SkGTypeface> face, const SkScalerContextEffects& effects,
const SkDescriptor* desc)
: SkScalerContext(std::move(face), effects, desc)
{
size_t descSize = SkDescriptor::ComputeOverhead(1) + sizeof(SkScalerContext::Rec);
SkAutoDescriptor ad(descSize);
SkDescriptor* newDesc = ad.getDesc();
newDesc->init();
void* entry = newDesc->addEntry(kRec_SkDescriptorTag,
sizeof(SkScalerContext::Rec), &fRec);
{
SkScalerContext::Rec* rec = (SkScalerContext::Rec*)entry;
rec->fTextSize = STD_SIZE;
rec->fPreScaleX = SK_Scalar1;
rec->fPreSkewX = 0;
rec->fPost2x2[0][0] = rec->fPost2x2[1][1] = SK_Scalar1;
rec->fPost2x2[1][0] = rec->fPost2x2[0][1] = 0;
}
SkASSERT(descSize == newDesc->getLength());
newDesc->computeChecksum();
fProxy = this->getGTypeface()->proxy()->createScalerContext(effects, newDesc);
fRec.getSingleMatrix(&fMatrix);
fMatrix.preScale(SK_Scalar1 / STD_SIZE, SK_Scalar1 / STD_SIZE);
}
protected:
SkGTypeface* getGTypeface() { return static_cast<SkGTypeface*>(this->getTypeface()); }
unsigned generateGlyphCount() override;
uint16_t generateCharToGlyph(SkUnichar) override;
void generateAdvance(SkGlyph*) override;
void generateMetrics(SkGlyph*) override;
void generateImage(const SkGlyph&) override;
void generatePath(SkGlyphID, SkPath*) override;
void generateFontMetrics(SkPaint::FontMetrics*) override;
private:
std::unique_ptr<SkScalerContext> fProxy;
SkMatrix fMatrix;
};
unsigned SkGScalerContext::generateGlyphCount() {
return fProxy->getGlyphCount();
}
uint16_t SkGScalerContext::generateCharToGlyph(SkUnichar uni) {
return fProxy->charToGlyphID(uni);
}
void SkGScalerContext::generateAdvance(SkGlyph* glyph) {
fProxy->getAdvance(glyph);
SkVector advance;
fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
SkFloatToScalar(glyph->fAdvanceY), &advance);
glyph->fAdvanceX = SkScalarToFloat(advance.fX);
glyph->fAdvanceY = SkScalarToFloat(advance.fY);
}
void SkGScalerContext::generateMetrics(SkGlyph* glyph) {
fProxy->getMetrics(glyph);
SkVector advance;
fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
SkFloatToScalar(glyph->fAdvanceY), &advance);
glyph->fAdvanceX = SkScalarToFloat(advance.fX);
glyph->fAdvanceY = SkScalarToFloat(advance.fY);
SkPath path;
fProxy->getPath(glyph->getPackedID(), &path);
path.transform(fMatrix);
SkRect storage;
const SkPaint& paint = this->getGTypeface()->paint();
const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
&storage,
SkPaint::kFill_Style);
SkIRect ibounds;
newBounds.roundOut(&ibounds);
glyph->fLeft = ibounds.fLeft;
glyph->fTop = ibounds.fTop;
glyph->fWidth = ibounds.width();
glyph->fHeight = ibounds.height();
glyph->fMaskFormat = SkMask::kARGB32_Format;
}
void SkGScalerContext::generateImage(const SkGlyph& glyph) {
if (SkMask::kARGB32_Format == glyph.fMaskFormat) {
SkPath path;
fProxy->getPath(glyph.getPackedID(), &path);
SkBitmap bm;
bm.installPixels(SkImageInfo::MakeN32Premul(glyph.fWidth, glyph.fHeight),
glyph.fImage, glyph.rowBytes());
bm.eraseColor(0);
SkCanvas canvas(bm);
canvas.translate(-SkIntToScalar(glyph.fLeft),
-SkIntToScalar(glyph.fTop));
canvas.concat(fMatrix);
canvas.drawPath(path, this->getGTypeface()->paint());
} else {
fProxy->getImage(glyph);
}
}
void SkGScalerContext::generatePath(SkGlyphID glyph, SkPath* path) {
fProxy->getPath(SkPackedGlyphID(glyph), path);
path->transform(fMatrix);
}
void SkGScalerContext::generateFontMetrics(SkPaint::FontMetrics* metrics) {
fProxy->getFontMetrics(metrics);
SkPaintPriv::ScaleFontMetrics(metrics, fMatrix.getScaleY());
}
///////////////////////////////////////////////////////////////////////////////
#include "SkTypefaceCache.h"
SkGTypeface::SkGTypeface(sk_sp<SkTypeface> proxy, const SkPaint& paint)
: SkTypeface(proxy->fontStyle(), false)
, fProxy(std::move(proxy))
, fPaint(paint)
{}
SkScalerContext* SkGTypeface::onCreateScalerContext(const SkScalerContextEffects& effects,
const SkDescriptor* desc) const {
return new SkGScalerContext(sk_ref_sp(const_cast<SkGTypeface*>(this)), effects, desc);
}
void SkGTypeface::onFilterRec(SkScalerContextRec* rec) const {
fProxy->filterRec(rec);
rec->setHinting(SkPaint::kNo_Hinting);
rec->fMaskFormat = SkMask::kARGB32_Format;
}
SkAdvancedTypefaceMetrics* SkGTypeface::onGetAdvancedTypefaceMetrics(
PerGlyphInfo info,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount) const {
return fProxy->getAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
}
SkStreamAsset* SkGTypeface::onOpenStream(int* ttcIndex) const {
return fProxy->openStream(ttcIndex);
}
void SkGTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
bool* isLocal) const {
fProxy->getFontDescriptor(desc, isLocal);
}
int SkGTypeface::onCharsToGlyphs(const void* chars, Encoding encoding,
uint16_t glyphs[], int glyphCount) const {
return fProxy->charsToGlyphs(chars, encoding, glyphs, glyphCount);
}
int SkGTypeface::onCountGlyphs() const {
return fProxy->countGlyphs();
}
int SkGTypeface::onGetUPEM() const {
return fProxy->getUnitsPerEm();
}
void SkGTypeface::onGetFamilyName(SkString* familyName) const {
fProxy->getFamilyName(familyName);
}
SkTypeface::LocalizedStrings* SkGTypeface::onCreateFamilyNameIterator() const {
return fProxy->createFamilyNameIterator();
}
int SkGTypeface::onGetVariationDesignPosition(
SkFontArguments::VariationPosition::Coordinate coordinates[], int coordinateCount) const
{
return fProxy->onGetVariationDesignPosition(coordinates, coordinateCount);
}
int SkGTypeface::onGetTableTags(SkFontTableTag tags[]) const {
return fProxy->getTableTags(tags);
}
size_t SkGTypeface::onGetTableData(SkFontTableTag tag, size_t offset,
size_t length, void* data) const {
return fProxy->getTableData(tag, offset, length, data);
}
///////////////////////////////////////////////////////////////////////////////
#if 0
// under construction -- defining a font purely in terms of skia primitives
// ala an SVG-font.
class SkGFont : public SkRefCnt {
public:
virtual ~SkGFont();
int unicharToGlyph(SkUnichar) const;
int countGlyphs() const { return fCount; }
float getAdvance(int index) const {
SkASSERT((unsigned)index < (unsigned)fCount);
return fGlyphs[index].fAdvance;
}
const SkPath& getPath(int index) const {
SkASSERT((unsigned)index < (unsigned)fCount);
return fGlyphs[index].fPath;
}
private:
struct Glyph {
SkUnichar fUni;
float fAdvance;
SkPath fPath;
};
int fCount;
Glyph* fGlyphs;
friend class SkGFontBuilder;
SkGFont(int count, Glyph* array);
};
class SkGFontBuilder {
public:
};
#endif
|
