Line data Source code
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 : static bool
31 0 : compose_hebrew (const hb_ot_shape_normalize_context_t *c,
32 : hb_codepoint_t a,
33 : hb_codepoint_t b,
34 : hb_codepoint_t *ab)
35 : {
36 : /* Hebrew presentation-form shaping.
37 : * https://bugzilla.mozilla.org/show_bug.cgi?id=728866
38 : * Hebrew presentation forms with dagesh, for characters U+05D0..05EA;
39 : * Note that some letters do not have a dagesh presForm encoded.
40 : */
41 : static const hb_codepoint_t sDageshForms[0x05EAu - 0x05D0u + 1] = {
42 : 0xFB30u, /* ALEF */
43 : 0xFB31u, /* BET */
44 : 0xFB32u, /* GIMEL */
45 : 0xFB33u, /* DALET */
46 : 0xFB34u, /* HE */
47 : 0xFB35u, /* VAV */
48 : 0xFB36u, /* ZAYIN */
49 : 0x0000u, /* HET */
50 : 0xFB38u, /* TET */
51 : 0xFB39u, /* YOD */
52 : 0xFB3Au, /* FINAL KAF */
53 : 0xFB3Bu, /* KAF */
54 : 0xFB3Cu, /* LAMED */
55 : 0x0000u, /* FINAL MEM */
56 : 0xFB3Eu, /* MEM */
57 : 0x0000u, /* FINAL NUN */
58 : 0xFB40u, /* NUN */
59 : 0xFB41u, /* SAMEKH */
60 : 0x0000u, /* AYIN */
61 : 0xFB43u, /* FINAL PE */
62 : 0xFB44u, /* PE */
63 : 0x0000u, /* FINAL TSADI */
64 : 0xFB46u, /* TSADI */
65 : 0xFB47u, /* QOF */
66 : 0xFB48u, /* RESH */
67 : 0xFB49u, /* SHIN */
68 : 0xFB4Au /* TAV */
69 : };
70 :
71 0 : bool found = (bool) c->unicode->compose (a, b, ab);
72 :
73 0 : if (!found && !c->plan->has_mark)
74 : {
75 : /* Special-case Hebrew presentation forms that are excluded from
76 : * standard normalization, but wanted for old fonts. */
77 0 : switch (b) {
78 : case 0x05B4u: /* HIRIQ */
79 0 : if (a == 0x05D9u) { /* YOD */
80 0 : *ab = 0xFB1Du;
81 0 : found = true;
82 : }
83 0 : break;
84 : case 0x05B7u: /* patah */
85 0 : if (a == 0x05F2u) { /* YIDDISH YOD YOD */
86 0 : *ab = 0xFB1Fu;
87 0 : found = true;
88 0 : } else if (a == 0x05D0u) { /* ALEF */
89 0 : *ab = 0xFB2Eu;
90 0 : found = true;
91 : }
92 0 : break;
93 : case 0x05B8u: /* QAMATS */
94 0 : if (a == 0x05D0u) { /* ALEF */
95 0 : *ab = 0xFB2Fu;
96 0 : found = true;
97 : }
98 0 : break;
99 : case 0x05B9u: /* HOLAM */
100 0 : if (a == 0x05D5u) { /* VAV */
101 0 : *ab = 0xFB4Bu;
102 0 : found = true;
103 : }
104 0 : break;
105 : case 0x05BCu: /* DAGESH */
106 0 : if (a >= 0x05D0u && a <= 0x05EAu) {
107 0 : *ab = sDageshForms[a - 0x05D0u];
108 0 : found = (*ab != 0);
109 0 : } else if (a == 0xFB2Au) { /* SHIN WITH SHIN DOT */
110 0 : *ab = 0xFB2Cu;
111 0 : found = true;
112 0 : } else if (a == 0xFB2Bu) { /* SHIN WITH SIN DOT */
113 0 : *ab = 0xFB2Du;
114 0 : found = true;
115 : }
116 0 : break;
117 : case 0x05BFu: /* RAFE */
118 0 : switch (a) {
119 : case 0x05D1u: /* BET */
120 0 : *ab = 0xFB4Cu;
121 0 : found = true;
122 0 : break;
123 : case 0x05DBu: /* KAF */
124 0 : *ab = 0xFB4Du;
125 0 : found = true;
126 0 : break;
127 : case 0x05E4u: /* PE */
128 0 : *ab = 0xFB4Eu;
129 0 : found = true;
130 0 : break;
131 : }
132 0 : break;
133 : case 0x05C1u: /* SHIN DOT */
134 0 : if (a == 0x05E9u) { /* SHIN */
135 0 : *ab = 0xFB2Au;
136 0 : found = true;
137 0 : } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
138 0 : *ab = 0xFB2Cu;
139 0 : found = true;
140 : }
141 0 : break;
142 : case 0x05C2u: /* SIN DOT */
143 0 : if (a == 0x05E9u) { /* SHIN */
144 0 : *ab = 0xFB2Bu;
145 0 : found = true;
146 0 : } else if (a == 0xFB49u) { /* SHIN WITH DAGESH */
147 0 : *ab = 0xFB2Du;
148 0 : found = true;
149 : }
150 0 : break;
151 : }
152 : }
153 :
154 0 : return found;
155 : }
156 :
157 : static bool
158 0 : disable_otl_hebrew (const hb_ot_shape_plan_t *plan)
159 : {
160 : /* For Hebrew shaper, use fallback if GPOS does not have 'hebr'
161 : * script. This matches Uniscribe better, and makes fonts like
162 : * Arial that have GSUB/GPOS/GDEF but no data for Hebrew work.
163 : * See:
164 : * https://github.com/behdad/harfbuzz/issues/347#issuecomment-267838368
165 : */
166 0 : return plan->map.chosen_script[1] != HB_TAG ('h','e','b','r');
167 : }
168 :
169 :
170 : const hb_ot_complex_shaper_t _hb_ot_complex_shaper_hebrew =
171 : {
172 : "hebrew",
173 : NULL, /* collect_features */
174 : NULL, /* override_features */
175 : NULL, /* data_create */
176 : NULL, /* data_destroy */
177 : NULL, /* preprocess_text */
178 : NULL, /* postprocess_glyphs */
179 : HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
180 : NULL, /* decompose */
181 : compose_hebrew,
182 : NULL, /* setup_masks */
183 : disable_otl_hebrew,
184 : HB_OT_SHAPE_ZERO_WIDTH_MARKS_BY_GDEF_LATE,
185 : true, /* fallback_position */
186 : };
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