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
|
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAdvancedTypefaceMetrics_DEFINED
#define SkAdvancedTypefaceMetrics_DEFINED
#include "SkRect.h"
#include "SkRefCnt.h"
#include "SkString.h"
#include "SkTDArray.h"
#include "SkTemplates.h"
#include "SkTScopedPtr.h"
/** \class SkAdvancedTypefaceMetrics
The SkAdvancedTypefaceMetrics class is used by the PDF backend to correctly
embed typefaces. This class is filled in with information about a given
typeface by the SkFontHost class.
*/
class SkAdvancedTypefaceMetrics : public SkRefCnt {
public:
SkString fFontName;
enum FontType {
kType1_Font,
kType1CID_Font,
kCFF_Font,
kTrueType_Font,
kOther_Font,
kNotEmbeddable_Font,
};
// The type of the underlying font program. This field determines which
// of the following fields are valid. If it is kOther_Font or
// kNotEmbeddable_Font, the per glyph information will never be populated.
FontType fType;
// fMultiMaster may be true for Type1_Font or CFF_Font.
bool fMultiMaster;
uint16_t fLastGlyphID; // The last valid glyph ID in the font.
uint16_t fEmSize; // The size of the em box (defines font units).
// These enum values match the values used in the PDF file format.
enum StyleFlags {
kFixedPitch_Style = 0x00001,
kSerif_Style = 0x00002,
kSymbolic_Style = 0x00004,
kScript_Style = 0x00008,
kNonsymbolic_Style = 0x00020,
kItalic_Style = 0x00040,
kAllCaps_Style = 0x10000,
kSmallCaps_Style = 0x20000,
kForceBold_Style = 0x40000,
};
uint16_t fStyle; // Font style characteristics.
int16_t fItalicAngle; // Counterclockwise degrees from vertical of the
// dominant vertical stroke for an Italic face.
// The following fields are all in font units.
int16_t fAscent; // Max height above baseline, not including accents.
int16_t fDescent; // Max depth below baseline (negative).
int16_t fStemV; // Thickness of dominant vertical stem.
int16_t fCapHeight; // Height (from baseline) of top of flat capitals.
SkIRect fBBox; // The bounding box of all glyphs (in font units).
// The type of advance data wanted.
enum PerGlyphInfo {
kNo_PerGlyphInfo = 0x0, // Don't populate any per glyph info.
kHAdvance_PerGlyphInfo = 0x1, // Populate horizontal advance data.
kVAdvance_PerGlyphInfo = 0x2, // Populate vertical advance data.
kGlyphNames_PerGlyphInfo = 0x4, // Populate glyph names (Type 1 only).
kToUnicode_PerGlyphInfo = 0x8, // Populate ToUnicode table, ignored
// for Type 1 fonts
};
template <typename Data>
struct AdvanceMetric {
enum MetricType {
kDefault, // Default advance: fAdvance.count = 1
kRange, // Advances for a range: fAdvance.count = fEndID-fStartID
kRun, // fStartID-fEndID have same advance: fAdvance.count = 1
};
MetricType fType;
uint16_t fStartId;
uint16_t fEndId;
SkTDArray<Data> fAdvance;
SkTScopedPtr<AdvanceMetric<Data> > fNext;
};
struct VerticalMetric {
int16_t fVerticalAdvance;
int16_t fOriginXDisp; // Horiz. displacement of the secondary origin.
int16_t fOriginYDisp; // Vert. displacement of the secondary origin.
};
typedef AdvanceMetric<int16_t> WidthRange;
typedef AdvanceMetric<VerticalMetric> VerticalAdvanceRange;
// This is indexed by glyph id.
SkTScopedPtr<WidthRange> fGlyphWidths;
// Only used for Vertical CID fonts.
SkTScopedPtr<VerticalAdvanceRange> fVerticalMetrics;
// The names of each glyph, only populated for postscript fonts.
SkTScopedPtr<SkAutoTArray<SkString> > fGlyphNames;
// The mapping from glyph to Unicode, only populated if
// kToUnicode_PerGlyphInfo is passed to GetAdvancedTypefaceMetrics.
SkTDArray<SkUnichar> fGlyphToUnicode;
};
namespace skia_advanced_typeface_metrics_utils {
template <typename Data>
void resetRange(SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* range,
int startId);
template <typename Data>
SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* appendRange(
SkTScopedPtr<SkAdvancedTypefaceMetrics::AdvanceMetric<Data> >* nextSlot,
int startId);
template <typename Data>
void finishRange(
SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* range,
int endId,
typename SkAdvancedTypefaceMetrics::AdvanceMetric<Data>::MetricType
type);
/** Retrieve advance data for glyphs. Used by the PDF backend. It calls
underlying platform dependent API getAdvance to acquire the data.
@param num_glyphs Total number of glyphs in the given font.
@param glyphIDs For per-glyph info, specify subset of the font by
giving glyph ids. Each integer represents a glyph
id. Passing NULL means all glyphs in the font.
@param glyphIDsCount Number of elements in subsetGlyphIds. Ignored if
glyphIDs is NULL.
*/
template <typename Data, typename FontHandle>
SkAdvancedTypefaceMetrics::AdvanceMetric<Data>* getAdvanceData(
FontHandle fontHandle,
int num_glyphs,
const uint32_t* glyphIDs,
uint32_t glyphIDsCount,
bool (*getAdvance)(FontHandle fontHandle, int gId, Data* data));
} // namespace skia_advanced_typeface_metrics_utils
#endif
|
