2 * Copyright © 2011,2012 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 * Google Author(s): Behdad Esfahbod
27 #ifndef HB_OT_OS2_TABLE_HH
28 #define HB_OT_OS2_TABLE_HH
30 #include "hb-open-type-private.hh"
31 #include "hb-ot-os2-unicode-ranges.hh"
32 #include "hb-subset-plan.hh"
37 * OS/2 and Windows Metrics
38 * https://docs.microsoft.com/en-us/typography/opentype/spec/os2
40 #define HB_OT_TAG_os2 HB_TAG('O','S','/','2')
44 static const hb_tag_t tableTag = HB_OT_TAG_os2;
46 inline bool sanitize (hb_sanitize_context_t *c) const
48 TRACE_SANITIZE (this);
49 return_trace (c->check_struct (this));
52 inline bool subset (hb_subset_plan_t *plan) const
54 hb_blob_t *os2_blob = OT::Sanitizer<OT::os2>().sanitize (hb_face_reference_table (plan->source, HB_OT_TAG_os2));
55 hb_blob_t *os2_prime_blob = hb_blob_create_sub_blob (os2_blob, 0, -1);
56 // TODO(grieger): move to hb_blob_copy_writable_or_fail
57 hb_blob_destroy (os2_blob);
59 OT::os2 *os2_prime = (OT::os2 *) hb_blob_get_data_writable (os2_prime_blob, nullptr);
60 if (unlikely (!os2_prime)) {
61 hb_blob_destroy (os2_prime_blob);
65 uint16_t min_cp, max_cp;
66 find_min_and_max_codepoint (plan->unicodes, &min_cp, &max_cp);
67 os2_prime->usFirstCharIndex.set (min_cp);
68 os2_prime->usLastCharIndex.set (max_cp);
70 _update_unicode_ranges (plan->unicodes, os2_prime->ulUnicodeRange);
71 bool result = plan->add_table (HB_OT_TAG_os2, os2_prime_blob);
73 hb_blob_destroy (os2_prime_blob);
77 inline void _update_unicode_ranges (const hb_set_t *codepoints,
78 HBUINT32 ulUnicodeRange[4]) const
80 for (unsigned int i = 0; i < 4; i++)
81 ulUnicodeRange[i].set (0);
83 hb_codepoint_t cp = HB_SET_VALUE_INVALID;
84 while (codepoints->next (&cp)) {
85 unsigned int bit = hb_get_unicode_range_bit (cp);
88 unsigned int block = bit / 32;
89 unsigned int bit_in_block = bit % 32;
90 unsigned int mask = 1 << bit_in_block;
91 ulUnicodeRange[block].set (ulUnicodeRange[block] | mask);
93 if (cp >= 0x10000 && cp <= 0x110000)
95 /* the spec says that bit 57 ("Non Plane 0") implies that there's
96 at least one codepoint beyond the BMP; so I also include all
97 the non-BMP codepoints here */
98 ulUnicodeRange[1].set (ulUnicodeRange[1] | (1 << 25));
103 static inline void find_min_and_max_codepoint (const hb_set_t *codepoints,
104 uint16_t *min_cp, /* OUT */
105 uint16_t *max_cp /* OUT */)
107 *min_cp = codepoints->get_min ();
108 *max_cp = codepoints->get_max ();
112 HEBREW_FONT_PAGE = 0xB100, // Hebrew Windows 3.1 font page
113 SIMP_ARABIC_FONT_PAGE = 0xB200, // Simplified Arabic Windows 3.1 font page
114 TRAD_ARABIC_FONT_PAGE = 0xB300, // Traditional Arabic Windows 3.1 font page
115 OEM_ARABIC_FONT_PAGE = 0xB400, // OEM Arabic Windows 3.1 font page
116 SIMP_FARSI_FONT_PAGE = 0xBA00, // Simplified Farsi Windows 3.1 font page
117 TRAD_FARSI_FONT_PAGE = 0xBB00, // Traditional Farsi Windows 3.1 font page
118 THAI_FONT_PAGE = 0xDE00 // Thai Windows 3.1 font page
121 // https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681
122 inline font_page_t get_font_page () const
125 return (font_page_t) 0;
126 return (font_page_t) (fsSelection & 0xFF00);
133 HBINT16 xAvgCharWidth;
134 HBUINT16 usWeightClass;
135 HBUINT16 usWidthClass;
137 HBINT16 ySubscriptXSize;
138 HBINT16 ySubscriptYSize;
139 HBINT16 ySubscriptXOffset;
140 HBINT16 ySubscriptYOffset;
141 HBINT16 ySuperscriptXSize;
142 HBINT16 ySuperscriptYSize;
143 HBINT16 ySuperscriptXOffset;
144 HBINT16 ySuperscriptYOffset;
145 HBINT16 yStrikeoutSize;
146 HBINT16 yStrikeoutPosition;
147 HBINT16 sFamilyClass;
149 HBUINT32 ulUnicodeRange[4];
151 HBUINT16 fsSelection;
152 HBUINT16 usFirstCharIndex;
153 HBUINT16 usLastCharIndex;
154 HBINT16 sTypoAscender;
155 HBINT16 sTypoDescender;
156 HBINT16 sTypoLineGap;
157 HBUINT16 usWinAscent;
158 HBUINT16 usWinDescent;
161 //HBUINT32 ulCodePageRange1;
162 //HBUINT32 ulCodePageRange2;
166 //HBINT16 sCapHeight;
167 //HBUINT16 usDefaultChar;
168 //HBUINT16 usBreakChar;
169 //HBUINT16 usMaxContext;
172 //HBUINT16 usLowerOpticalPointSize;
173 //HBUINT16 usUpperOpticalPointSize;
176 DEFINE_SIZE_STATIC (78);
182 #endif /* HB_OT_OS2_TABLE_HH */