1 /*
2 * Copyright © 2009 Red Hat, Inc.
3 * Copyright © 2011 Codethink Limited
4 * Copyright © 2010,2011,2012 Google, Inc.
5 *
6 * This is part of HarfBuzz, a text shaping library.
7 *
8 * Permission is hereby granted, without written agreement and without
9 * license or royalty fees, to use, copy, modify, and distribute this
10 * software and its documentation for any purpose, provided that the
11 * above copyright notice and the following two paragraphs appear in
12 * all copies of this software.
13 *
14 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
15 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
16 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
17 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
18 * DAMAGE.
19 *
20 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
21 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
22 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
23 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
24 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
25 *
26 * Red Hat Author(s): Behdad Esfahbod
27 * Codethink Author(s): Ryan Lortie
28 * Google Author(s): Behdad Esfahbod
29 */
30
31 #ifndef HB_UNICODE_PRIVATE_HH
32 #define HB_UNICODE_PRIVATE_HH
33
34 #include "hb-private.hh"
35 #include "hb-object-private.hh"
36
37
38 extern HB_INTERNAL const uint8_t _hb_modified_combining_class[256];
39
40 /*
41 * hb_unicode_funcs_t
42 */
43
44 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS \
45 HB_UNICODE_FUNC_IMPLEMENT (combining_class) \
46 HB_UNICODE_FUNC_IMPLEMENT (eastasian_width) \
47 HB_UNICODE_FUNC_IMPLEMENT (general_category) \
48 HB_UNICODE_FUNC_IMPLEMENT (mirroring) \
49 HB_UNICODE_FUNC_IMPLEMENT (script) \
50 HB_UNICODE_FUNC_IMPLEMENT (compose) \
51 HB_UNICODE_FUNC_IMPLEMENT (decompose) \
52 HB_UNICODE_FUNC_IMPLEMENT (decompose_compatibility) \
53 /* ^--- Add new callbacks here */
54
55 /* Simple callbacks are those taking a hb_codepoint_t and returning a hb_codepoint_t */
56 #define HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE \
57 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_combining_class_t, combining_class) \
58 HB_UNICODE_FUNC_IMPLEMENT (unsigned int, eastasian_width) \
59 HB_UNICODE_FUNC_IMPLEMENT (hb_unicode_general_category_t, general_category) \
60 HB_UNICODE_FUNC_IMPLEMENT (hb_codepoint_t, mirroring) \
61 HB_UNICODE_FUNC_IMPLEMENT (hb_script_t, script) \
62 /* ^--- Add new simple callbacks here */
63
64 struct hb_unicode_funcs_t {
65 hb_object_header_t header;
66 ASSERT_POD ();
67
68 hb_unicode_funcs_t *parent;
69
70 bool immutable;
71
72 #define HB_UNICODE_FUNC_IMPLEMENT(return_type, name) \
73 inline return_type name (hb_codepoint_t unicode) { return func.name (this, unicode, user_data.name); }
74 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS_SIMPLE
75 #undef HB_UNICODE_FUNC_IMPLEMENT
76
77 inline hb_bool_t compose (hb_codepoint_t a, hb_codepoint_t b,
78 hb_codepoint_t *ab)
79 {
80 *ab = 0;
81 if (unlikely (!a || !b)) return false;
82 return func.compose (this, a, b, ab, user_data.compose);
83 }
84
85 inline hb_bool_t decompose (hb_codepoint_t ab,
86 hb_codepoint_t *a, hb_codepoint_t *b)
87 {
88 *a = ab; *b = 0;
89 return func.decompose (this, ab, a, b, user_data.decompose);
90 }
91
92 inline unsigned int decompose_compatibility (hb_codepoint_t u,
93 hb_codepoint_t *decomposed)
94 {
95 unsigned int ret = func.decompose_compatibility (this, u, decomposed, user_data.decompose_compatibility);
96 if (ret == 1 && u == decomposed[0]) {
97 decomposed[0] = 0;
98 return 0;
99 }
100 decomposed[ret] = 0;
101 return ret;
102 }
103
104
105 inline unsigned int
106 modified_combining_class (hb_codepoint_t unicode)
107 {
108 /* XXX This hack belongs to the Myanmar shaper. */
109 if (unlikely (unicode == 0x1037u)) unicode = 0x103Au;
110
111 /* XXX This hack belongs to the USE shaper (for Tai Tham):
112 * Reorder SAKOT to ensure it comes after any tone marks. */
113 if (unlikely (unicode == 0x1A60u)) return 254;
114
115 /* XXX This hack belongs to the Tibetan shaper:
116 * Reorder PADMA to ensure it comes after any vowel marks. */
117 if (unlikely (unicode == 0x0FC6u)) return 254;
118 /* Reorder TSA -PHRU to reorder before U+0F74 */
119 if (unlikely (unicode == 0x0F39u)) return 127;
120
121 return _hb_modified_combining_class[combining_class (unicode)];
122 }
123
124 static inline hb_bool_t
125 is_variation_selector (hb_codepoint_t unicode)
126 {
127 /* U+180B..180D MONGOLIAN FREE VARIATION SELECTORs are handled in the
128 * Arabic shaper. No need to match them here. */
129 return unlikely (hb_in_ranges<hb_codepoint_t> (unicode,
130 0xFE00u, 0xFE0Fu, /* VARIATION SELECTOR-1..16 */
131 0xE0100u, 0xE01EFu)); /* VARIATION SELECTOR-17..256 */
132 }
133
134 /* Default_Ignorable codepoints:
135 *
136 * Note: While U+115F, U+1160, U+3164 and U+FFA0 are Default_Ignorable,
137 * we do NOT want to hide them, as the way Uniscribe has implemented them
138 * is with regular spacing glyphs, and that's the way fonts are made to work.
139 * As such, we make exceptions for those four.
140 * Also ignoring U+1BCA0..1BCA3. https://github.com/behdad/harfbuzz/issues/503
141 *
142 * Unicode 7.0:
143 * $ grep '; Default_Ignorable_Code_Point ' DerivedCoreProperties.txt | sed 's/;.*#/#/'
144 * 00AD # Cf SOFT HYPHEN
145 * 034F # Mn COMBINING GRAPHEME JOINER
146 * 061C # Cf ARABIC LETTER MARK
147 * 115F..1160 # Lo [2] HANGUL CHOSEONG FILLER..HANGUL JUNGSEONG FILLER
148 * 17B4..17B5 # Mn [2] KHMER VOWEL INHERENT AQ..KHMER VOWEL INHERENT AA
149 * 180B..180D # Mn [3] MONGOLIAN FREE VARIATION SELECTOR ONE..MONGOLIAN FREE VARIATION SELECTOR THREE
150 * 180E # Cf MONGOLIAN VOWEL SEPARATOR
151 * 200B..200F # Cf [5] ZERO WIDTH SPACE..RIGHT-TO-LEFT MARK
152 * 202A..202E # Cf [5] LEFT-TO-RIGHT EMBEDDING..RIGHT-TO-LEFT OVERRIDE
153 * 2060..2064 # Cf [5] WORD JOINER..INVISIBLE PLUS
154 * 2065 # Cn <reserved-2065>
155 * 2066..206F # Cf [10] LEFT-TO-RIGHT ISOLATE..NOMINAL DIGIT SHAPES
156 * 3164 # Lo HANGUL FILLER
157 * FE00..FE0F # Mn [16] VARIATION SELECTOR-1..VARIATION SELECTOR-16
158 * FEFF # Cf ZERO WIDTH NO-BREAK SPACE
159 * FFA0 # Lo HALFWIDTH HANGUL FILLER
160 * FFF0..FFF8 # Cn [9] <reserved-FFF0>..<reserved-FFF8>
161 * 1BCA0..1BCA3 # Cf [4] SHORTHAND FORMAT LETTER OVERLAP..SHORTHAND FORMAT UP STEP
162 * 1D173..1D17A # Cf [8] MUSICAL SYMBOL BEGIN BEAM..MUSICAL SYMBOL END PHRASE
163 * E0000 # Cn <reserved-E0000>
164 * E0001 # Cf LANGUAGE TAG
165 * E0002..E001F # Cn [30] <reserved-E0002>..<reserved-E001F>
166 * E0020..E007F # Cf [96] TAG SPACE..CANCEL TAG
167 * E0080..E00FF # Cn [128] <reserved-E0080>..<reserved-E00FF>
168 * E0100..E01EF # Mn [240] VARIATION SELECTOR-17..VARIATION SELECTOR-256
169 * E01F0..E0FFF # Cn [3600] <reserved-E01F0>..<reserved-E0FFF>
170 */
171 static inline hb_bool_t
172 is_default_ignorable (hb_codepoint_t ch)
173 {
174 hb_codepoint_t plane = ch >> 16;
175 if (likely (plane == 0))
176 {
177 /* BMP */
178 hb_codepoint_t page = ch >> 8;
179 switch (page) {
180 case 0x00: return unlikely (ch == 0x00ADu);
181 case 0x03: return unlikely (ch == 0x034Fu);
182 case 0x06: return unlikely (ch == 0x061Cu);
183 case 0x17: return hb_in_range<hb_codepoint_t> (ch, 0x17B4u, 0x17B5u);
184 case 0x18: return hb_in_range<hb_codepoint_t> (ch, 0x180Bu, 0x180Eu);
185 case 0x20: return hb_in_ranges<hb_codepoint_t> (ch, 0x200Bu, 0x200Fu,
186 0x202Au, 0x202Eu,
187 0x2060u, 0x206Fu);
188 case 0xFE: return hb_in_range<hb_codepoint_t> (ch, 0xFE00u, 0xFE0Fu) || ch == 0xFEFFu;
189 case 0xFF: return hb_in_range<hb_codepoint_t> (ch, 0xFFF0u, 0xFFF8u);
190 default: return false;
191 }
192 }
193 else
194 {
195 /* Other planes */
196 switch (plane) {
197 case 0x01: return hb_in_range<hb_codepoint_t> (ch, 0x1D173u, 0x1D17Au);
198 case 0x0E: return hb_in_range<hb_codepoint_t> (ch, 0xE0000u, 0xE0FFFu);
199 default: return false;
200 }
201 }
202 }
203
204 /* Space estimates based on:
205 * http://www.unicode.org/charts/PDF/U2000.pdf
206 * https://www.microsoft.com/typography/developers/fdsspec/spaces.aspx
207 */
208 enum space_t {
209 NOT_SPACE = 0,
210 SPACE_EM = 1,
211 SPACE_EM_2 = 2,
212 SPACE_EM_3 = 3,
213 SPACE_EM_4 = 4,
214 SPACE_EM_5 = 5,
215 SPACE_EM_6 = 6,
216 SPACE_EM_16 = 16,
217 SPACE_4_EM_18, /* 4/18th of an EM! */
218 SPACE,
219 SPACE_FIGURE,
220 SPACE_PUNCTUATION,
221 SPACE_NARROW,
222 };
223 static inline space_t
224 space_fallback_type (hb_codepoint_t u)
225 {
226 switch (u)
227 {
228 /* All GC=Zs chars that can use a fallback. */
229 default: return NOT_SPACE; /* U+1680 OGHAM SPACE MARK */
230 case 0x0020u: return SPACE; /* U+0020 SPACE */
231 case 0x00A0u: return SPACE; /* U+00A0 NO-BREAK SPACE */
232 case 0x2000u: return SPACE_EM_2; /* U+2000 EN QUAD */
233 case 0x2001u: return SPACE_EM; /* U+2001 EM QUAD */
234 case 0x2002u: return SPACE_EM_2; /* U+2002 EN SPACE */
235 case 0x2003u: return SPACE_EM; /* U+2003 EM SPACE */
236 case 0x2004u: return SPACE_EM_3; /* U+2004 THREE-PER-EM SPACE */
237 case 0x2005u: return SPACE_EM_4; /* U+2005 FOUR-PER-EM SPACE */
238 case 0x2006u: return SPACE_EM_6; /* U+2006 SIX-PER-EM SPACE */
239 case 0x2007u: return SPACE_FIGURE; /* U+2007 FIGURE SPACE */
240 case 0x2008u: return SPACE_PUNCTUATION; /* U+2008 PUNCTUATION SPACE */
241 case 0x2009u: return SPACE_EM_5; /* U+2009 THIN SPACE */
242 case 0x200Au: return SPACE_EM_16; /* U+200A HAIR SPACE */
243 case 0x202Fu: return SPACE_NARROW; /* U+202F NARROW NO-BREAK SPACE */
244 case 0x205Fu: return SPACE_4_EM_18; /* U+205F MEDIUM MATHEMATICAL SPACE */
245 case 0x3000u: return SPACE_EM; /* U+3000 IDEOGRAPHIC SPACE */
246 }
247 }
248
249 struct {
250 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_unicode_##name##_func_t name;
251 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
252 #undef HB_UNICODE_FUNC_IMPLEMENT
253 } func;
254
255 struct {
256 #define HB_UNICODE_FUNC_IMPLEMENT(name) void *name;
257 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
258 #undef HB_UNICODE_FUNC_IMPLEMENT
259 } user_data;
260
261 struct {
262 #define HB_UNICODE_FUNC_IMPLEMENT(name) hb_destroy_func_t name;
263 HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
264 #undef HB_UNICODE_FUNC_IMPLEMENT
265 } destroy;
266 };
267
268
269 extern HB_INTERNAL const hb_unicode_funcs_t _hb_unicode_funcs_nil;
270
271
272 /* Modified combining marks */
273
274 /* Hebrew
275 *
276 * We permute the "fixed-position" classes 10-26 into the order
277 * described in the SBL Hebrew manual:
278 *
279 * http://www.sbl-site.org/Fonts/SBLHebrewUserManual1.5x.pdf
280 *
281 * (as recommended by:
282 * http://forum.fontlab.com/archive-old-microsoft-volt-group/vista-and-diacritic-ordering-t6751.0.html)
283 *
284 * More details here:
285 * https://bugzilla.mozilla.org/show_bug.cgi?id=662055
286 */
287 #define HB_MODIFIED_COMBINING_CLASS_CCC10 22 /* sheva */
288 #define HB_MODIFIED_COMBINING_CLASS_CCC11 15 /* hataf segol */
289 #define HB_MODIFIED_COMBINING_CLASS_CCC12 16 /* hataf patah */
290 #define HB_MODIFIED_COMBINING_CLASS_CCC13 17 /* hataf qamats */
291 #define HB_MODIFIED_COMBINING_CLASS_CCC14 23 /* hiriq */
292 #define HB_MODIFIED_COMBINING_CLASS_CCC15 18 /* tsere */
293 #define HB_MODIFIED_COMBINING_CLASS_CCC16 19 /* segol */
294 #define HB_MODIFIED_COMBINING_CLASS_CCC17 20 /* patah */
295 #define HB_MODIFIED_COMBINING_CLASS_CCC18 21 /* qamats */
296 #define HB_MODIFIED_COMBINING_CLASS_CCC19 14 /* holam */
297 #define HB_MODIFIED_COMBINING_CLASS_CCC20 24 /* qubuts */
298 #define HB_MODIFIED_COMBINING_CLASS_CCC21 12 /* dagesh */
299 #define HB_MODIFIED_COMBINING_CLASS_CCC22 25 /* meteg */
300 #define HB_MODIFIED_COMBINING_CLASS_CCC23 13 /* rafe */
301 #define HB_MODIFIED_COMBINING_CLASS_CCC24 10 /* shin dot */
302 #define HB_MODIFIED_COMBINING_CLASS_CCC25 11 /* sin dot */
303 #define HB_MODIFIED_COMBINING_CLASS_CCC26 26 /* point varika */
304
305 /*
306 * Arabic
307 *
308 * Modify to move Shadda (ccc=33) before other marks. See:
309 * http://unicode.org/faq/normalization.html#8
310 * http://unicode.org/faq/normalization.html#9
311 */
312 #define HB_MODIFIED_COMBINING_CLASS_CCC27 28 /* fathatan */
313 #define HB_MODIFIED_COMBINING_CLASS_CCC28 29 /* dammatan */
314 #define HB_MODIFIED_COMBINING_CLASS_CCC29 30 /* kasratan */
315 #define HB_MODIFIED_COMBINING_CLASS_CCC30 31 /* fatha */
316 #define HB_MODIFIED_COMBINING_CLASS_CCC31 32 /* damma */
317 #define HB_MODIFIED_COMBINING_CLASS_CCC32 33 /* kasra */
318 #define HB_MODIFIED_COMBINING_CLASS_CCC33 27 /* shadda */
319 #define HB_MODIFIED_COMBINING_CLASS_CCC34 34 /* sukun */
320 #define HB_MODIFIED_COMBINING_CLASS_CCC35 35 /* superscript alef */
321
322 /* Syriac */
323 #define HB_MODIFIED_COMBINING_CLASS_CCC36 36 /* superscript alaph */
324
325 /* Telugu
326 *
327 * Modify Telugu length marks (ccc=84, ccc=91).
328 * These are the only matras in the main Indic scripts range that have
329 * a non-zero ccc. That makes them reorder with the Halant that is
330 * ccc=9. Just zero them, we don't need them in our Indic shaper.
331 */
332 #define HB_MODIFIED_COMBINING_CLASS_CCC84 0 /* length mark */
333 #define HB_MODIFIED_COMBINING_CLASS_CCC91 0 /* ai length mark */
334
335 /* Thai
336 *
337 * Modify U+0E38 and U+0E39 (ccc=103) to be reordered before U+0E3A (ccc=9).
338 * Assign 3, which is unassigned otherwise.
339 * Uniscribe does this reordering too.
340 */
341 #define HB_MODIFIED_COMBINING_CLASS_CCC103 3 /* sara u / sara uu */
342 #define HB_MODIFIED_COMBINING_CLASS_CCC107 107 /* mai * */
343
344 /* Lao */
345 #define HB_MODIFIED_COMBINING_CLASS_CCC118 118 /* sign u / sign uu */
346 #define HB_MODIFIED_COMBINING_CLASS_CCC122 122 /* mai * */
347
348 /* Tibetan
349 *
350 * In case of multiple vowel-signs, use u first (but after achung)
351 * this allows Dzongkha multi-vowel shortcuts to render correctly
352 */
353 #define HB_MODIFIED_COMBINING_CLASS_CCC129 129 /* sign aa */
354 #define HB_MODIFIED_COMBINING_CLASS_CCC130 132 /* sign i */
355 #define HB_MODIFIED_COMBINING_CLASS_CCC132 131 /* sign u */
356
357 /* Misc */
358
359 #define HB_UNICODE_GENERAL_CATEGORY_IS_MARK(gen_cat) \
360 (FLAG_UNSAFE (gen_cat) & \
361 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
362 FLAG (HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) | \
363 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK)))
364
365 #define HB_UNICODE_GENERAL_CATEGORY_IS_NON_ENCLOSING_MARK_OR_MODIFIER_SYMBOL(gen_cat) \
366 (FLAG_UNSAFE (gen_cat) & \
367 (FLAG (HB_UNICODE_GENERAL_CATEGORY_SPACING_MARK) | \
368 FLAG (HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK) | \
369 FLAG (HB_UNICODE_GENERAL_CATEGORY_MODIFIER_SYMBOL)))
370
371 #endif /* HB_UNICODE_PRIVATE_HH */