1/*
2 * Copyright © 2013 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#ifndef HB_OT_LAYOUT_JSTF_TABLE_HH
28#define HB_OT_LAYOUT_JSTF_TABLE_HH
29
30#include "hb-open-type.hh"
31#include "hb-ot-layout-gpos-table.hh"
32
33
34namespace OT {
35
36
37/*
38 * JstfModList -- Justification Modification List Tables
39 */
40
41typedef IndexArray JstfModList;
42
43
44/*
45 * JstfMax -- Justification Maximum Table
46 */
47
48typedef OffsetListOf<PosLookup> JstfMax;
49
50
51/*
52 * JstfPriority -- Justification Priority Table
53 */
54
55struct JstfPriority
56{
57 bool sanitize (hb_sanitize_context_t *c) const
58 {
59 TRACE_SANITIZE (this);
60 return_trace (c->check_struct (this) &&
61 shrinkageEnableGSUB.sanitize (c, this) &&
62 shrinkageDisableGSUB.sanitize (c, this) &&
63 shrinkageEnableGPOS.sanitize (c, this) &&
64 shrinkageDisableGPOS.sanitize (c, this) &&
65 shrinkageJstfMax.sanitize (c, this) &&
66 extensionEnableGSUB.sanitize (c, this) &&
67 extensionDisableGSUB.sanitize (c, this) &&
68 extensionEnableGPOS.sanitize (c, this) &&
69 extensionDisableGPOS.sanitize (c, this) &&
70 extensionJstfMax.sanitize (c, this));
71 }
72
73 protected:
74 OffsetTo<JstfModList>
75 shrinkageEnableGSUB; /* Offset to Shrinkage Enable GSUB
76 * JstfModList table--from beginning of
77 * JstfPriority table--may be NULL */
78 OffsetTo<JstfModList>
79 shrinkageDisableGSUB; /* Offset to Shrinkage Disable GSUB
80 * JstfModList table--from beginning of
81 * JstfPriority table--may be NULL */
82 OffsetTo<JstfModList>
83 shrinkageEnableGPOS; /* Offset to Shrinkage Enable GPOS
84 * JstfModList table--from beginning of
85 * JstfPriority table--may be NULL */
86 OffsetTo<JstfModList>
87 shrinkageDisableGPOS; /* Offset to Shrinkage Disable GPOS
88 * JstfModList table--from beginning of
89 * JstfPriority table--may be NULL */
90 OffsetTo<JstfMax>
91 shrinkageJstfMax; /* Offset to Shrinkage JstfMax table--
92 * from beginning of JstfPriority table
93 * --may be NULL */
94 OffsetTo<JstfModList>
95 extensionEnableGSUB; /* Offset to Extension Enable GSUB
96 * JstfModList table--from beginning of
97 * JstfPriority table--may be NULL */
98 OffsetTo<JstfModList>
99 extensionDisableGSUB; /* Offset to Extension Disable GSUB
100 * JstfModList table--from beginning of
101 * JstfPriority table--may be NULL */
102 OffsetTo<JstfModList>
103 extensionEnableGPOS; /* Offset to Extension Enable GPOS
104 * JstfModList table--from beginning of
105 * JstfPriority table--may be NULL */
106 OffsetTo<JstfModList>
107 extensionDisableGPOS; /* Offset to Extension Disable GPOS
108 * JstfModList table--from beginning of
109 * JstfPriority table--may be NULL */
110 OffsetTo<JstfMax>
111 extensionJstfMax; /* Offset to Extension JstfMax table--
112 * from beginning of JstfPriority table
113 * --may be NULL */
114
115 public:
116 DEFINE_SIZE_STATIC (20);
117};
118
119
120/*
121 * JstfLangSys -- Justification Language System Table
122 */
123
124struct JstfLangSys : OffsetListOf<JstfPriority>
125{
126 bool sanitize (hb_sanitize_context_t *c,
127 const Record_sanitize_closure_t * = nullptr) const
128 {
129 TRACE_SANITIZE (this);
130 return_trace (OffsetListOf<JstfPriority>::sanitize (c));
131 }
132};
133
134
135/*
136 * ExtenderGlyphs -- Extender Glyph Table
137 */
138
139typedef SortedArrayOf<HBGlyphID> ExtenderGlyphs;
140
141
142/*
143 * JstfScript -- The Justification Table
144 */
145
146struct JstfScript
147{
148 unsigned int get_lang_sys_count () const
149 { return langSys.len; }
150 const Tag& get_lang_sys_tag (unsigned int i) const
151 { return langSys.get_tag (i); }
152 unsigned int get_lang_sys_tags (unsigned int start_offset,
153 unsigned int *lang_sys_count /* IN/OUT */,
154 hb_tag_t *lang_sys_tags /* OUT */) const
155 { return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
156 const JstfLangSys& get_lang_sys (unsigned int i) const
157 {
158 if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
159 return this+langSys[i].offset;
160 }
161 bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
162 { return langSys.find_index (tag, index); }
163
164 bool has_default_lang_sys () const { return defaultLangSys != 0; }
165 const JstfLangSys& get_default_lang_sys () const { return this+defaultLangSys; }
166
167 bool sanitize (hb_sanitize_context_t *c,
168 const Record_sanitize_closure_t * = nullptr) const
169 {
170 TRACE_SANITIZE (this);
171 return_trace (extenderGlyphs.sanitize (c, this) &&
172 defaultLangSys.sanitize (c, this) &&
173 langSys.sanitize (c, this));
174 }
175
176 protected:
177 OffsetTo<ExtenderGlyphs>
178 extenderGlyphs; /* Offset to ExtenderGlyph table--from beginning
179 * of JstfScript table-may be NULL */
180 OffsetTo<JstfLangSys>
181 defaultLangSys; /* Offset to DefaultJstfLangSys table--from
182 * beginning of JstfScript table--may be Null */
183 RecordArrayOf<JstfLangSys>
184 langSys; /* Array of JstfLangSysRecords--listed
185 * alphabetically by LangSysTag */
186 public:
187 DEFINE_SIZE_ARRAY (6, langSys);
188};
189
190
191/*
192 * JSTF -- Justification
193 * https://docs.microsoft.com/en-us/typography/opentype/spec/jstf
194 */
195
196struct JSTF
197{
198 static constexpr hb_tag_t tableTag = HB_OT_TAG_JSTF;
199
200 unsigned int get_script_count () const
201 { return scriptList.len; }
202 const Tag& get_script_tag (unsigned int i) const
203 { return scriptList.get_tag (i); }
204 unsigned int get_script_tags (unsigned int start_offset,
205 unsigned int *script_count /* IN/OUT */,
206 hb_tag_t *script_tags /* OUT */) const
207 { return scriptList.get_tags (start_offset, script_count, script_tags); }
208 const JstfScript& get_script (unsigned int i) const
209 { return this+scriptList[i].offset; }
210 bool find_script_index (hb_tag_t tag, unsigned int *index) const
211 { return scriptList.find_index (tag, index); }
212
213 bool sanitize (hb_sanitize_context_t *c) const
214 {
215 TRACE_SANITIZE (this);
216 return_trace (version.sanitize (c) &&
217 likely (version.major == 1) &&
218 scriptList.sanitize (c, this));
219 }
220
221 protected:
222 FixedVersion<>version; /* Version of the JSTF table--initially set
223 * to 0x00010000u */
224 RecordArrayOf<JstfScript>
225 scriptList; /* Array of JstfScripts--listed
226 * alphabetically by ScriptTag */
227 public:
228 DEFINE_SIZE_ARRAY (6, scriptList);
229};
230
231
232} /* namespace OT */
233
234
235#endif /* HB_OT_LAYOUT_JSTF_TABLE_HH */
236