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.hh"
28
29 #ifndef HB_NO_OT_SHAPE
30
31 #include "hb-ot-shape-complex.hh"
32
33
34 static bool
compose_hebrew(const hb_ot_shape_normalize_context_t * c,hb_codepoint_t a,hb_codepoint_t b,hb_codepoint_t * ab)35 compose_hebrew (const hb_ot_shape_normalize_context_t *c,
36 hb_codepoint_t a,
37 hb_codepoint_t b,
38 hb_codepoint_t *ab)
39 {
40 /* Hebrew presentation-form shaping.
41 * https://bugzilla.mozilla.org/show_bug.cgi?id=728866
42 * Hebrew presentation forms with dagesh, for characters U+05D0..05EA;
43 * Note that some letters do not have a dagesh presForm encoded.
44 */
45 static const hb_codepoint_t sDageshForms[0x05EAu - 0x05D0u + 1] = {
46 0xFB30u, /* ALEF */
47 0xFB31u, /* BET */
48 0xFB32u, /* GIMEL */
49 0xFB33u, /* DALET */
50 0xFB34u, /* HE */
51 0xFB35u, /* VAV */
52 0xFB36u, /* ZAYIN */
53 0x0000u, /* HET */
54 0xFB38u, /* TET */
55 0xFB39u, /* YOD */
56 0xFB3Au, /* FINAL KAF */
57 0xFB3Bu, /* KAF */
58 0xFB3Cu, /* LAMED */
59 0x0000u, /* FINAL MEM */
60 0xFB3Eu, /* MEM */
61 0x0000u, /* FINAL NUN */
62 0xFB40u, /* NUN */
63 0xFB41u, /* SAMEKH */
64 0x0000u, /* AYIN */
65 0xFB43u, /* FINAL PE */
66 0xFB44u, /* PE */
67 0x0000u, /* FINAL TSADI */
68 0xFB46u, /* TSADI */
69 0xFB47u, /* QOF */
70 0xFB48u, /* RESH */
71 0xFB49u, /* SHIN */
72 0xFB4Au /* TAV */
73 };
74
75 bool found = (bool) c->unicode->compose (a, b, ab);
76
77 #ifdef HB_NO_OT_SHAPE_COMPLEX_HEBREW_FALLBACK
78 return found;
79 #endif
80
81 if (!found && !c->plan->has_gpos_mark)
82 {
83 /* Special-case Hebrew presentation forms that are excluded from
84 * standard normalization, but wanted for old fonts. */
85 switch (b) {
86 case 0x05B4u: /* HIRIQ */
87 if (a == 0x05D9u) { /* YOD */
88 *ab = 0xFB1Du;
89 found = true;
90 }
91 break;
92 case 0x05B7u: /* patah */
93 if (a == 0x05F2u) { /* YIDDISH YOD YOD */
94 *ab = 0xFB1Fu;
95 found = true;
96 } else if (a == 0x05D0u) { /* ALEF */
97 *ab = 0xFB2Eu;
98 found = true;
99 }
100 break;
101 case 0x05B8u: /* QAMATS */
102 if (a == 0x05D0u) { /* ALEF */
103 *ab = 0xFB2Fu;
104 found = true;
105 }
106 break;
107 case 0x05B9u: /* HOLAM */
108 if (a == 0x05D5u) { /* VAV */
109 *ab = 0xFB4Bu;
110 found = true;
111 }
112 break;
113 case 0x05BCu: /* DAGESH */
114 if (a >= 0x05D0u && a <= 0x05EAu) {
115 *ab = sDageshForms[a - 0x05D0u];
116 found = (*ab != 0);
117 } else if (a == 0xFB2Au) { /* SHIN WITH SHIN DOT */
118 *ab = 0xFB2Cu;
119 found = true;
120 } else if (a == 0xFB2Bu) { /* SHIN WITH SIN DOT */
121 *ab = 0xFB2Du;
122 found = true;
123 }
124 break;
125 case 0x05BFu: /* RAFE */
126 switch (a) {
127 case 0x05D1u: /* BET */
128 *ab = 0xFB4Cu;
129 found = true;
130 break;
131 case 0x05DBu: /* KAF */
132 *ab = 0xFB4Du;
133 found = true;
134 break;
135 case 0x05E4u: /* PE */
136 *ab = 0xFB4Eu;
137 found = true;
138 break;
139 }
140 break;
141 case 0x05C1u: /* SHIN DOT */
142 if (a == 0x05E9u) { /* SHIN */
143 *ab = 0xFB2Au;
144 found = true;
145 } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
146 *ab = 0xFB2Cu;
147 found = true;
148 }
149 break;
150 case 0x05C2u: /* SIN DOT */
151 if (a == 0x05E9u) { /* SHIN */
152 *ab = 0xFB2Bu;
153 found = true;
154 } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
155 *ab = 0xFB2Du;
156 found = true;
157 }
158 break;
159 }
160 }
161
162 return found;
163 }
164
165
166 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hebrew =
167 {
168 nullptr, /* collect_features */
169 nullptr, /* override_features */
170 nullptr, /* data_create */
171 nullptr, /* data_destroy */
172 nullptr, /* preprocess_text */
173 nullptr, /* postprocess_glyphs */
174 HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
175 nullptr, /* decompose */
176 compose_hebrew,
177 nullptr, /* setup_masks */
178 HB_TAG ('h','e','b','r'), /* gpos_tag. https://github.com/harfbuzz/harfbuzz/issues/347#issuecomment-267838368 */
179 nullptr, /* reorder_marks */
180 HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
181 true, /* fallback_position */
182 };
183
184
185 #endif
186