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
|
/*
* Copyright 2011 The Android Open Source Project
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkFontMgr_android_parser_DEFINED
#define SkFontMgr_android_parser_DEFINED
#include "SkFontMgr.h"
#include "SkString.h"
#include "SkTArray.h"
#include "SkTDArray.h"
#include "SkTypes.h"
#include <climits>
#include <limits>
/** \class SkLanguage
The SkLanguage class represents a human written language, and is used by
text draw operations to determine which glyph to draw when drawing
characters with variants (ie Han-derived characters).
*/
class SkLanguage {
public:
SkLanguage() { }
SkLanguage(const SkString& tag) : fTag(tag) { }
SkLanguage(const char* tag) : fTag(tag) { }
SkLanguage(const char* tag, size_t len) : fTag(tag, len) { }
SkLanguage(const SkLanguage& b) : fTag(b.fTag) { }
/** Gets a BCP 47 language identifier for this SkLanguage.
@return a BCP 47 language identifier representing this language
*/
const SkString& getTag() const { return fTag; }
/** Performs BCP 47 fallback to return an SkLanguage one step more general.
@return an SkLanguage one step more general
*/
SkLanguage getParent() const;
bool operator==(const SkLanguage& b) const {
return fTag == b.fTag;
}
bool operator!=(const SkLanguage& b) const {
return fTag != b.fTag;
}
SkLanguage& operator=(const SkLanguage& b) {
fTag = b.fTag;
return *this;
}
private:
//! BCP 47 language identifier
SkString fTag;
};
enum FontVariants {
kDefault_FontVariant = 0x01,
kCompact_FontVariant = 0x02,
kElegant_FontVariant = 0x04,
kLast_FontVariant = kElegant_FontVariant,
};
typedef uint32_t FontVariant;
// Must remain trivially movable (can be memmoved).
struct FontFileInfo {
FontFileInfo() : fIndex(0), fWeight(0), fStyle(Style::kAuto) { }
SkString fFileName;
int fIndex;
int fWeight;
enum class Style { kAuto, kNormal, kItalic } fStyle;
SkTArray<SkFontMgr::FontParameters::Axis, true> fAxes;
};
/**
* A font family provides one or more names for a collection of fonts, each of
* which has a different style (normal, italic) or weight (thin, light, bold,
* etc).
* Some fonts may occur in compact variants for use in the user interface.
* Android distinguishes "fallback" fonts to support non-ASCII character sets.
*/
struct FontFamily {
FontFamily(const SkString& basePath, bool isFallbackFont)
: fVariant(kDefault_FontVariant)
, fOrder(-1)
, fIsFallbackFont(isFallbackFont)
, fBasePath(basePath)
{ }
SkTArray<SkString, true> fNames;
SkTArray<FontFileInfo, true> fFonts;
SkLanguage fLanguage;
FontVariant fVariant;
int fOrder; // internal to the parser, not useful to users.
bool fIsFallbackFont;
const SkString fBasePath;
};
namespace SkFontMgr_Android_Parser {
/** Parses system font configuration files and appends result to fontFamilies. */
void GetSystemFontFamilies(SkTDArray<FontFamily*>& fontFamilies);
/** Parses font configuration files and appends result to fontFamilies. */
void GetCustomFontFamilies(SkTDArray<FontFamily*>& fontFamilies,
const SkString& basePath,
const char* fontsXml,
const char* fallbackFontsXml,
const char* langFallbackFontsDir = nullptr);
} // SkFontMgr_Android_Parser namespace
/** Parses a null terminated string into an integer type, checking for overflow.
* http://www.w3.org/TR/html-markup/datatypes.html#common.data.integer.non-negative-def
*
* If the string cannot be parsed into 'value', returns false and does not change 'value'.
*/
template <typename T> static bool parse_non_negative_integer(const char* s, T* value) {
static_assert(std::numeric_limits<T>::is_integer, "T_must_be_integer");
if (*s == '\0') {
return false;
}
const T nMax = std::numeric_limits<T>::max() / 10;
const T dMax = std::numeric_limits<T>::max() - (nMax * 10);
T n = 0;
for (; *s; ++s) {
// Check if digit
if (*s < '0' || '9' < *s) {
return false;
}
T d = *s - '0';
// Check for overflow
if (n > nMax || (n == nMax && d > dMax)) {
return false;
}
n = (n * 10) + d;
}
*value = n;
return true;
}
/** Parses a null terminated string into a signed fixed point value with bias N.
*
* Like http://www.w3.org/TR/html-markup/datatypes.html#common.data.float-def ,
* but may start with '.' and does not support 'e'. '-?((:digit:+(.:digit:+)?)|(.:digit:+))'
*
* Checks for overflow.
* Low bit rounding is not defined (is currently truncate).
* Bias (N) required to allow for the sign bit and 4 bits of integer.
*
* If the string cannot be parsed into 'value', returns false and does not change 'value'.
*/
template <int N, typename T> static bool parse_fixed(const char* s, T* value) {
static_assert(std::numeric_limits<T>::is_integer, "T_must_be_integer");
static_assert(std::numeric_limits<T>::is_signed, "T_must_be_signed");
static_assert(sizeof(T) * CHAR_BIT - N >= 5, "N_must_leave_four_bits_plus_sign");
bool negate = false;
if (*s == '-') {
++s;
negate = true;
}
if (*s == '\0') {
return false;
}
const T nMax = (std::numeric_limits<T>::max() >> N) / 10;
const T dMax = (std::numeric_limits<T>::max() >> N) - (nMax * 10);
T n = 0;
T frac = 0;
for (; *s; ++s) {
// Check if digit
if (*s < '0' || '9' < *s) {
// If it wasn't a digit, check if it is a '.' followed by something.
if (*s != '.' || s[1] == '\0') {
return false;
}
// Find the end, verify digits.
for (++s; *s; ++s) {
if (*s < '0' || '9' < *s) {
return false;
}
}
// Read back toward the '.'.
for (--s; *s != '.'; --s) {
T d = *s - '0';
frac = (frac + (d << N)) / 10; // This requires four bits overhead.
}
break;
}
T d = *s - '0';
// Check for overflow
if (n > nMax || (n == nMax && d > dMax)) {
return false;
}
n = (n * 10) + d;
}
if (negate) {
n = -n;
frac = -frac;
}
*value = SkLeftShift(n, N) + frac;
return true;
}
#endif /* SkFontMgr_android_parser_DEFINED */
|
