1 /*
2 * Copyright © 2010,2012 Google, Inc.
3 *
4 * This is part of HarfBuzz, a text shaping library.
5 *
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.
11 *
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
16 * DAMAGE.
17 *
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.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27 #include "hb-ot-shape-complex-private.hh"
28
29
30 /* TODO Add kana, and other small shapers here */
31
32
33 /* The default shaper *only* adds additional per-script features.*/
34
35 static const hb_tag_t hangul_features[] =
36 {
37 HB_TAG('l','j','m','o'),
38 HB_TAG('v','j','m','o'),
39 HB_TAG('t','j','m','o'),
40 HB_TAG_NONE
41 };
42
43 static const hb_tag_t tibetan_features[] =
44 {
45 HB_TAG('a','b','v','s'),
46 HB_TAG('b','l','w','s'),
47 HB_TAG('a','b','v','m'),
48 HB_TAG('b','l','w','m'),
49 HB_TAG_NONE
50 };
51
52 static void
collect_features_default(hb_ot_shape_planner_t * plan)53 collect_features_default (hb_ot_shape_planner_t *plan)
54 {
55 const hb_tag_t *script_features = NULL;
56
57 switch ((hb_tag_t) plan->props.script)
58 {
59 /* Unicode-1.1 additions */
60 case HB_SCRIPT_HANGUL:
61 script_features = hangul_features;
62 break;
63
64 /* Unicode-2.0 additions */
65 case HB_SCRIPT_TIBETAN:
66 script_features = tibetan_features;
67 break;
68 }
69
70 for (; script_features && *script_features; script_features++)
71 plan->map.add_global_bool_feature (*script_features);
72 }
73
74 static hb_ot_shape_normalization_mode_t
normalization_preference_default(const hb_segment_properties_t * props)75 normalization_preference_default (const hb_segment_properties_t *props)
76 {
77 return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS;
78 }
79
80 static bool
compose_default(const hb_ot_shape_normalize_context_t * c,hb_codepoint_t a,hb_codepoint_t b,hb_codepoint_t * ab)81 compose_default (const hb_ot_shape_normalize_context_t *c,
82 hb_codepoint_t a,
83 hb_codepoint_t b,
84 hb_codepoint_t *ab)
85 {
86 /* Hebrew presentation-form shaping.
87 * https://bugzilla.mozilla.org/show_bug.cgi?id=728866
88 * Hebrew presentation forms with dagesh, for characters 0x05D0..0x05EA;
89 * Note that some letters do not have a dagesh presForm encoded.
90 */
91 static const hb_codepoint_t sDageshForms[0x05EA - 0x05D0 + 1] = {
92 0xFB30, /* ALEF */
93 0xFB31, /* BET */
94 0xFB32, /* GIMEL */
95 0xFB33, /* DALET */
96 0xFB34, /* HE */
97 0xFB35, /* VAV */
98 0xFB36, /* ZAYIN */
99 0x0000, /* HET */
100 0xFB38, /* TET */
101 0xFB39, /* YOD */
102 0xFB3A, /* FINAL KAF */
103 0xFB3B, /* KAF */
104 0xFB3C, /* LAMED */
105 0x0000, /* FINAL MEM */
106 0xFB3E, /* MEM */
107 0x0000, /* FINAL NUN */
108 0xFB40, /* NUN */
109 0xFB41, /* SAMEKH */
110 0x0000, /* AYIN */
111 0xFB43, /* FINAL PE */
112 0xFB44, /* PE */
113 0x0000, /* FINAL TSADI */
114 0xFB46, /* TSADI */
115 0xFB47, /* QOF */
116 0xFB48, /* RESH */
117 0xFB49, /* SHIN */
118 0xFB4A /* TAV */
119 };
120
121 bool found = c->unicode->compose (a, b, ab);
122
123 if (!found && (b & ~0x7F) == 0x0580) {
124 /* Special-case Hebrew presentation forms that are excluded from
125 * standard normalization, but wanted for old fonts. */
126 switch (b) {
127 case 0x05B4: /* HIRIQ */
128 if (a == 0x05D9) { /* YOD */
129 *ab = 0xFB1D;
130 found = true;
131 }
132 break;
133 case 0x05B7: /* patah */
134 if (a == 0x05F2) { /* YIDDISH YOD YOD */
135 *ab = 0xFB1F;
136 found = true;
137 } else if (a == 0x05D0) { /* ALEF */
138 *ab = 0xFB2E;
139 found = true;
140 }
141 break;
142 case 0x05B8: /* QAMATS */
143 if (a == 0x05D0) { /* ALEF */
144 *ab = 0xFB2F;
145 found = true;
146 }
147 break;
148 case 0x05B9: /* HOLAM */
149 if (a == 0x05D5) { /* VAV */
150 *ab = 0xFB4B;
151 found = true;
152 }
153 break;
154 case 0x05BC: /* DAGESH */
155 if (a >= 0x05D0 && a <= 0x05EA) {
156 *ab = sDageshForms[a - 0x05D0];
157 found = (*ab != 0);
158 } else if (a == 0xFB2A) { /* SHIN WITH SHIN DOT */
159 *ab = 0xFB2C;
160 found = true;
161 } else if (a == 0xFB2B) { /* SHIN WITH SIN DOT */
162 *ab = 0xFB2D;
163 found = true;
164 }
165 break;
166 case 0x05BF: /* RAFE */
167 switch (a) {
168 case 0x05D1: /* BET */
169 *ab = 0xFB4C;
170 found = true;
171 break;
172 case 0x05DB: /* KAF */
173 *ab = 0xFB4D;
174 found = true;
175 break;
176 case 0x05E4: /* PE */
177 *ab = 0xFB4E;
178 found = true;
179 break;
180 }
181 break;
182 case 0x05C1: /* SHIN DOT */
183 if (a == 0x05E9) { /* SHIN */
184 *ab = 0xFB2A;
185 found = true;
186 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */
187 *ab = 0xFB2C;
188 found = true;
189 }
190 break;
191 case 0x05C2: /* SIN DOT */
192 if (a == 0x05E9) { /* SHIN */
193 *ab = 0xFB2B;
194 found = true;
195 } else if (a == 0xFB49) { /* SHIN WITH DAGESH */
196 *ab = 0xFB2D;
197 found = true;
198 }
199 break;
200 }
201 }
202
203 return found;
204 }
205
206 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_default =
207 {
208 "default",
209 collect_features_default,
210 NULL, /* override_features */
211 NULL, /* data_create */
212 NULL, /* data_destroy */
213 NULL, /* preprocess_text */
214 normalization_preference_default,
215 NULL, /* decompose */
216 compose_default,
217 NULL, /* setup_masks */
218 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_UNICODE_LATE,
219 true, /* fallback_position */
220 };
221