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
|
/*
* Copyright © 2011,2012 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_OS2_TABLE_HH
#define HB_OT_OS2_TABLE_HH
#include "hb-open-type-private.hh"
#include "hb-ot-os2-unicode-ranges.hh"
#include "hb-subset-plan.hh"
namespace OT {
/*
* OS/2 and Windows Metrics
* https://docs.microsoft.com/en-us/typography/opentype/spec/os2
*/
#define HB_OT_TAG_os2 HB_TAG('O','S','/','2')
struct os2
{
static const hb_tag_t tableTag = HB_OT_TAG_os2;
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
inline bool subset (hb_subset_plan_t *plan) const
{
hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>().sanitize (hb_face_reference_table (plan->source, HB_OT_TAG_os2));
hb_blob_t *os2_prime_blob = hb_blob_create_sub_blob (os2_blob, 0, -1);
// TODO(grieger): move to hb_blob_copy_writable_or_fail
hb_blob_destroy (os2_blob);
OT::os2 *os2_prime = (OT::os2 *) hb_blob_get_data_writable (os2_prime_blob, nullptr);
if (unlikely (!os2_prime)) {
hb_blob_destroy (os2_prime_blob);
return false;
}
uint16_t min_cp, max_cp;
find_min_and_max_codepoint (plan->unicodes, &min_cp, &max_cp);
os2_prime->usFirstCharIndex.set (min_cp);
os2_prime->usLastCharIndex.set (max_cp);
_update_unicode_ranges (plan->unicodes, os2_prime->ulUnicodeRange);
bool result = plan->add_table (HB_OT_TAG_os2, os2_prime_blob);
hb_blob_destroy (os2_prime_blob);
return result;
}
inline void _update_unicode_ranges (const hb_set_t *codepoints,
HBUINT32 ulUnicodeRange[4]) const
{
for (unsigned int i = 0; i < 4; i++)
ulUnicodeRange[i].set (0);
hb_codepoint_t cp = HB_SET_VALUE_INVALID;
while (codepoints->next (&cp)) {
unsigned int bit = hb_get_unicode_range_bit (cp);
if (bit < 128)
{
unsigned int block = bit / 32;
unsigned int bit_in_block = bit % 32;
unsigned int mask = 1 << bit_in_block;
ulUnicodeRange[block].set (ulUnicodeRange[block] | mask);
}
if (cp >= 0x10000 && cp <= 0x110000)
{
/* the spec says that bit 57 ("Non Plane 0") implies that there's
at least one codepoint beyond the BMP; so I also include all
the non-BMP codepoints here */
ulUnicodeRange[1].set (ulUnicodeRange[1] | (1 << 25));
}
}
}
static inline void find_min_and_max_codepoint (const hb_set_t *codepoints,
uint16_t *min_cp, /* OUT */
uint16_t *max_cp /* OUT */)
{
*min_cp = codepoints->get_min ();
*max_cp = codepoints->get_max ();
}
enum font_page_t {
HEBREW_FONT_PAGE = 0xB100, // Hebrew Windows 3.1 font page
SIMP_ARABIC_FONT_PAGE = 0xB200, // Simplified Arabic Windows 3.1 font page
TRAD_ARABIC_FONT_PAGE = 0xB300, // Traditional Arabic Windows 3.1 font page
OEM_ARABIC_FONT_PAGE = 0xB400, // OEM Arabic Windows 3.1 font page
SIMP_FARSI_FONT_PAGE = 0xBA00, // Simplified Farsi Windows 3.1 font page
TRAD_FARSI_FONT_PAGE = 0xBB00, // Traditional Farsi Windows 3.1 font page
THAI_FONT_PAGE = 0xDE00 // Thai Windows 3.1 font page
};
// https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681
inline font_page_t get_font_page () const
{
if (version != 0)
return (font_page_t) 0;
return (font_page_t) (fsSelection & 0xFF00);
}
public:
HBUINT16 version;
/* Version 0 */
HBINT16 xAvgCharWidth;
HBUINT16 usWeightClass;
HBUINT16 usWidthClass;
HBUINT16 fsType;
HBINT16 ySubscriptXSize;
HBINT16 ySubscriptYSize;
HBINT16 ySubscriptXOffset;
HBINT16 ySubscriptYOffset;
HBINT16 ySuperscriptXSize;
HBINT16 ySuperscriptYSize;
HBINT16 ySuperscriptXOffset;
HBINT16 ySuperscriptYOffset;
HBINT16 yStrikeoutSize;
HBINT16 yStrikeoutPosition;
HBINT16 sFamilyClass;
HBUINT8 panose[10];
HBUINT32 ulUnicodeRange[4];
Tag achVendID;
HBUINT16 fsSelection;
HBUINT16 usFirstCharIndex;
HBUINT16 usLastCharIndex;
HBINT16 sTypoAscender;
HBINT16 sTypoDescender;
HBINT16 sTypoLineGap;
HBUINT16 usWinAscent;
HBUINT16 usWinDescent;
/* Version 1 */
//HBUINT32 ulCodePageRange1;
//HBUINT32 ulCodePageRange2;
/* Version 2 */
//HBINT16 sxHeight;
//HBINT16 sCapHeight;
//HBUINT16 usDefaultChar;
//HBUINT16 usBreakChar;
//HBUINT16 usMaxContext;
/* Version 5 */
//HBUINT16 usLowerOpticalPointSize;
//HBUINT16 usUpperOpticalPointSize;
public:
DEFINE_SIZE_STATIC (78);
};
} /* namespace OT */
#endif /* HB_OT_OS2_TABLE_HH */
|
