2 * Copyright © 2011,2012 Google, Inc.
3 * Copyright © 2018 Ebrahim Byagowi
5 * This is part of HarfBuzz, a text shaping library.
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 * Google Author(s): Behdad Esfahbod
28 #ifndef HB_OT_OS2_TABLE_HH
29 #define HB_OT_OS2_TABLE_HH
31 #include "hb-open-type.hh"
32 #include "hb-ot-os2-unicode-ranges.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')
47 bool sanitize (hb_sanitize_context_t *c) const
49 TRACE_SANITIZE (this);
50 return_trace (c->check_struct (this));
54 HBUINT32 ulCodePageRange1;
55 HBUINT32 ulCodePageRange2;
57 DEFINE_SIZE_STATIC (8);
62 bool has_data () const { return sxHeight || sCapHeight; }
64 const OS2V2Tail * operator -> () const { return this; }
66 bool sanitize (hb_sanitize_context_t *c) const
68 TRACE_SANITIZE (this);
69 return_trace (c->check_struct (this));
75 HBUINT16 usDefaultChar;
77 HBUINT16 usMaxContext;
79 DEFINE_SIZE_STATIC (10);
84 inline bool get_optical_size (unsigned int *lower, unsigned int *upper) const
86 unsigned int lower_optical_size = usLowerOpticalPointSize;
87 unsigned int upper_optical_size = usUpperOpticalPointSize;
89 /* Per https://docs.microsoft.com/en-us/typography/opentype/spec/os2#lps */
90 if (lower_optical_size < upper_optical_size &&
91 lower_optical_size >= 1 && lower_optical_size <= 0xFFFE &&
92 upper_optical_size >= 2 && upper_optical_size <= 0xFFFF)
94 *lower = lower_optical_size;
95 *upper = upper_optical_size;
101 bool sanitize (hb_sanitize_context_t *c) const
103 TRACE_SANITIZE (this);
104 return_trace (c->check_struct (this));
108 HBUINT16 usLowerOpticalPointSize;
109 HBUINT16 usUpperOpticalPointSize;
111 DEFINE_SIZE_STATIC (4);
116 static constexpr hb_tag_t tableTag = HB_OT_TAG_OS2;
118 bool has_data () const { return usWeightClass || usWidthClass || usFirstCharIndex || usLastCharIndex; }
120 const OS2V1Tail &v1 () const { return version >= 1 ? v1X : Null (OS2V1Tail); }
121 const OS2V2Tail &v2 () const { return version >= 2 ? v2X : Null (OS2V2Tail); }
122 const OS2V5Tail &v5 () const { return version >= 5 ? v5X : Null (OS2V5Tail); }
124 enum selection_flag_t {
132 USE_TYPO_METRICS = 1u<<7,
137 bool is_italic () const { return fsSelection & ITALIC; }
138 bool is_oblique () const { return fsSelection & OBLIQUE; }
139 bool use_typo_metrics () const { return fsSelection & USE_TYPO_METRICS; }
142 FWIDTH_ULTRA_CONDENSED = 1, /* 50% */
143 FWIDTH_EXTRA_CONDENSED = 2, /* 62.5% */
144 FWIDTH_CONDENSED = 3, /* 75% */
145 FWIDTH_SEMI_CONDENSED = 4, /* 87.5% */
146 FWIDTH_NORMAL = 5, /* 100% */
147 FWIDTH_SEMI_EXPANDED = 6, /* 112.5% */
148 FWIDTH_EXPANDED = 7, /* 125% */
149 FWIDTH_EXTRA_EXPANDED = 8, /* 150% */
150 FWIDTH_ULTRA_EXPANDED = 9 /* 200% */
153 float get_width () const
155 switch (usWidthClass) {
156 case FWIDTH_ULTRA_CONDENSED:return 50.f;
157 case FWIDTH_EXTRA_CONDENSED:return 62.5f;
158 case FWIDTH_CONDENSED: return 75.f;
159 case FWIDTH_SEMI_CONDENSED: return 87.5f;
161 case FWIDTH_NORMAL: return 100.f;
162 case FWIDTH_SEMI_EXPANDED: return 112.5f;
163 case FWIDTH_EXPANDED: return 125.f;
164 case FWIDTH_EXTRA_EXPANDED: return 150.f;
165 case FWIDTH_ULTRA_EXPANDED: return 200.f;
169 bool subset (hb_subset_context_t *c) const
172 OS2 *os2_prime = c->serializer->embed (this);
173 if (unlikely (!os2_prime)) return_trace (false);
175 uint16_t min_cp, max_cp;
176 find_min_and_max_codepoint (c->plan->unicodes, &min_cp, &max_cp);
177 os2_prime->usFirstCharIndex = min_cp;
178 os2_prime->usLastCharIndex = max_cp;
180 _update_unicode_ranges (c->plan->unicodes, os2_prime->ulUnicodeRange);
185 void _update_unicode_ranges (const hb_set_t *codepoints,
186 HBUINT32 ulUnicodeRange[4]) const
189 for (unsigned int i = 0; i < 4; i++)
192 hb_codepoint_t cp = HB_SET_VALUE_INVALID;
193 while (codepoints->next (&cp)) {
194 unsigned int bit = _hb_ot_os2_get_unicode_range_bit (cp);
197 unsigned int block = bit / 32;
198 unsigned int bit_in_block = bit % 32;
199 unsigned int mask = 1 << bit_in_block;
200 newBits[block] = newBits[block] | mask;
202 if (cp >= 0x10000 && cp <= 0x110000)
204 /* the spec says that bit 57 ("Non Plane 0") implies that there's
205 at least one codepoint beyond the BMP; so I also include all
206 the non-BMP codepoints here */
207 newBits[1] = newBits[1] | (1 << 25);
211 for (unsigned int i = 0; i < 4; i++)
212 ulUnicodeRange[i] = ulUnicodeRange[i] & newBits[i]; // set bits only if set in the original
215 static void find_min_and_max_codepoint (const hb_set_t *codepoints,
216 uint16_t *min_cp, /* OUT */
217 uint16_t *max_cp /* OUT */)
219 *min_cp = codepoints->get_min ();
220 *max_cp = codepoints->get_max ();
223 /* https://github.com/Microsoft/Font-Validator/blob/520aaae/OTFontFileVal/val_OS2.cs#L644-L681 */
225 HEBREW_FONT_PAGE = 0xB100, // Hebrew Windows 3.1 font page
226 SIMP_ARABIC_FONT_PAGE = 0xB200, // Simplified Arabic Windows 3.1 font page
227 TRAD_ARABIC_FONT_PAGE = 0xB300, // Traditional Arabic Windows 3.1 font page
228 OEM_ARABIC_FONT_PAGE = 0xB400, // OEM Arabic Windows 3.1 font page
229 SIMP_FARSI_FONT_PAGE = 0xBA00, // Simplified Farsi Windows 3.1 font page
230 TRAD_FARSI_FONT_PAGE = 0xBB00, // Traditional Farsi Windows 3.1 font page
231 THAI_FONT_PAGE = 0xDE00 // Thai Windows 3.1 font page
233 font_page_t get_font_page () const
234 { return (font_page_t) (version == 0 ? fsSelection & 0xFF00 : 0); }
236 unsigned get_size () const
238 unsigned result = min_size;
239 if (version >= 1) result += v1X.get_size ();
240 if (version >= 2) result += v2X.get_size ();
241 if (version >= 5) result += v5X.get_size ();
245 bool sanitize (hb_sanitize_context_t *c) const
247 TRACE_SANITIZE (this);
248 if (unlikely (!c->check_struct (this))) return_trace (false);
249 if (unlikely (version >= 1 && !v1X.sanitize (c))) return_trace (false);
250 if (unlikely (version >= 2 && !v2X.sanitize (c))) return_trace (false);
251 if (unlikely (version >= 5 && !v5X.sanitize (c))) return_trace (false);
257 HBINT16 xAvgCharWidth;
258 HBUINT16 usWeightClass;
259 HBUINT16 usWidthClass;
261 HBINT16 ySubscriptXSize;
262 HBINT16 ySubscriptYSize;
263 HBINT16 ySubscriptXOffset;
264 HBINT16 ySubscriptYOffset;
265 HBINT16 ySuperscriptXSize;
266 HBINT16 ySuperscriptYSize;
267 HBINT16 ySuperscriptXOffset;
268 HBINT16 ySuperscriptYOffset;
269 HBINT16 yStrikeoutSize;
270 HBINT16 yStrikeoutPosition;
271 HBINT16 sFamilyClass;
273 HBUINT32 ulUnicodeRange[4];
275 HBUINT16 fsSelection;
276 HBUINT16 usFirstCharIndex;
277 HBUINT16 usLastCharIndex;
278 HBINT16 sTypoAscender;
279 HBINT16 sTypoDescender;
280 HBINT16 sTypoLineGap;
281 HBUINT16 usWinAscent;
282 HBUINT16 usWinDescent;
287 DEFINE_SIZE_MIN (78);
293 #endif /* HB_OT_OS2_TABLE_HH */