blob: 5639d87b67972170a1cdfb900bfc181daa00202a (
plain)
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
|
/*
* 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 SkPDFFont_DEFINED
#define SkPDFFont_DEFINED
#include "SkAdvancedTypefaceMetrics.h"
#include "SkBitSet.h"
#include "SkPDFTypes.h"
#include "SkTDArray.h"
#include "SkTypeface.h"
class SkAutoGlyphCache;
class SkPDFCanon;
class SkPDFFont;
/** \class SkPDFFont
A PDF Object class representing a font. The font may have resources
attached to it in order to embed the font. SkPDFFonts are canonicalized
so that resource deduplication will only include one copy of a font.
This class uses the same pattern as SkPDFGraphicState, a static weak
reference to each instantiated class.
*/
class SkPDFFont : public SkPDFDict {
public:
~SkPDFFont() override;
/** Returns the typeface represented by this class. Returns nullptr for the
* default typeface.
*/
SkTypeface* typeface() const { return fTypeface.get(); }
/** Returns the font type represented in this font. For Type0 fonts,
* returns the type of the decendant font.
*/
SkAdvancedTypefaceMetrics::FontType getType() const { return fFontType; }
static SkAdvancedTypefaceMetrics::FontType FontType(const SkAdvancedTypefaceMetrics&);
static bool IsMultiByte(SkAdvancedTypefaceMetrics::FontType type) {
return type == SkAdvancedTypefaceMetrics::kType1CID_Font ||
type == SkAdvancedTypefaceMetrics::kTrueType_Font;
}
static SkAutoGlyphCache MakeVectorCache(SkTypeface*, int* sizeOut);
/** Returns true if this font encoding supports glyph IDs above 255.
*/
bool multiByteGlyphs() const { return SkPDFFont::IsMultiByte(this->getType()); }
/** Return true if this font has an encoding for the passed glyph id.
*/
bool hasGlyph(SkGlyphID gid) {
return (gid >= fFirstGlyphID && gid <= fLastGlyphID) || gid == 0;
}
/** Convert the input glyph ID into the font encoding. */
SkGlyphID glyphToPDFFontEncoding(SkGlyphID gid) const {
if (this->multiByteGlyphs() || gid == 0) {
return gid;
}
SkASSERT(gid >= fFirstGlyphID && gid <= fLastGlyphID);
SkASSERT(fFirstGlyphID > 0);
return gid - fFirstGlyphID + 1;
}
void noteGlyphUsage(SkGlyphID glyph) {
SkASSERT(this->hasGlyph(glyph));
fGlyphUsage.set(glyph);
}
/** Get the font resource for the passed typeface and glyphID. The
* reference count of the object is incremented and it is the caller's
* responsibility to unreference it when done. This is needed to
* accommodate the weak reference pattern used when the returned object
* is new and has no other references.
* @param typeface The typeface to find, not nullptr.
* @param glyphID Specify which section of a large font is of interest.
*/
static sk_sp<SkPDFFont> GetFontResource(SkPDFCanon* canon,
SkTypeface* typeface,
SkGlyphID glyphID);
/** Gets SkAdvancedTypefaceMetrics, and caches the result.
* @param typeface can not be nullptr.
* @return nullptr only when typeface is bad.
*/
static const SkAdvancedTypefaceMetrics* GetMetrics(SkTypeface* typeface,
SkPDFCanon* canon);
/** Subset the font based on current usage.
* Must be called before emitObject().
*/
virtual void getFontSubset(SkPDFCanon*) = 0;
/**
* Return false iff the typeface has its NotEmbeddable flag set.
* typeface is not nullptr
*/
static bool CanEmbedTypeface(SkTypeface*, SkPDFCanon*);
protected:
// Common constructor to handle common members.
struct Info {
sk_sp<SkTypeface> fTypeface;
SkGlyphID fFirstGlyphID;
SkGlyphID fLastGlyphID;
SkAdvancedTypefaceMetrics::FontType fFontType;
};
SkPDFFont(Info);
SkGlyphID firstGlyphID() const { return fFirstGlyphID; }
SkGlyphID lastGlyphID() const { return fLastGlyphID; }
const SkBitSet& glyphUsage() const { return fGlyphUsage; }
sk_sp<SkTypeface> refTypeface() const { return fTypeface; }
void drop() override;
private:
sk_sp<SkTypeface> fTypeface;
SkBitSet fGlyphUsage;
// The glyph IDs accessible with this font. For Type1 (non CID) fonts,
// this will be a subset if the font has more than 255 glyphs.
const SkGlyphID fFirstGlyphID;
const SkGlyphID fLastGlyphID;
const SkAdvancedTypefaceMetrics::FontType fFontType;
typedef SkPDFDict INHERITED;
};
#endif
|
