third_party/harfbuzz-ng/src/hb-ot-layout-jstf-table.hh

   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-private.hh"
  31 #include "hb-ot-layout-gpos-table.hh"
  32
  33
  34 namespace OT {
  35
  36
  37 /*
  38  * JstfModList -- Justification Modification List Tables
  39  */
  40
  41 typedef IndexArray JstfModList;
  42
  43
  44 /*
  45  * JstfMax -- Justification Maximum Table
  46  */
  47
  48 typedef OffsetListOf<PosLookup> JstfMax;
  49
  50
  51 /*
  52  * JstfPriority -- Justification Priority Table
  53  */
  54
  55 struct JstfPriority
  56 {
  57   inline bool sanitize (hb_sanitize_context_t *c) {
  58     TRACE_SANITIZE (this);
  59     return TRACE_RETURN (c->check_struct (this) &&
  60                          shrinkageEnableGSUB.sanitize (c, this) &&
  61                          shrinkageDisableGSUB.sanitize (c, this) &&
  62                          shrinkageEnableGPOS.sanitize (c, this) &&
  63                          shrinkageDisableGPOS.sanitize (c, this) &&
  64                          shrinkageJstfMax.sanitize (c, this) &&
  65                          extensionEnableGSUB.sanitize (c, this) &&
  66                          extensionDisableGSUB.sanitize (c, this) &&
  67                          extensionEnableGPOS.sanitize (c, this) &&
  68                          extensionDisableGPOS.sanitize (c, this) &&
  69                          extensionJstfMax.sanitize (c, this));
  70   }
  71
  72   protected:
  73   OffsetTo<JstfModList>
  74                 shrinkageEnableGSUB;    /* Offset to Shrinkage Enable GSUB
  75                                          * JstfModList table--from beginning of
  76                                          * JstfPriority table--may be NULL */
  77   OffsetTo<JstfModList>
  78                 shrinkageDisableGSUB;   /* Offset to Shrinkage Disable GSUB
  79                                          * JstfModList table--from beginning of
  80                                          * JstfPriority table--may be NULL */
  81   OffsetTo<JstfModList>
  82                 shrinkageEnableGPOS;    /* Offset to Shrinkage Enable GPOS
  83                                          * JstfModList table--from beginning of
  84                                          * JstfPriority table--may be NULL */
  85   OffsetTo<JstfModList>
  86                 shrinkageDisableGPOS;   /* Offset to Shrinkage Disable GPOS
  87                                          * JstfModList table--from beginning of
  88                                          * JstfPriority table--may be NULL */
  89   OffsetTo<JstfMax>
  90                 shrinkageJstfMax;       /* Offset to Shrinkage JstfMax table--
  91                                          * from beginning of JstfPriority table
  92                                          * --may be NULL */
  93   OffsetTo<JstfModList>
  94                 extensionEnableGSUB;    /* Offset to Extension Enable GSUB
  95                                          * JstfModList table--from beginning of
  96                                          * JstfPriority table--may be NULL */
  97   OffsetTo<JstfModList>
  98                 extensionDisableGSUB;   /* Offset to Extension Disable GSUB
  99                                          * JstfModList table--from beginning of
 100                                          * JstfPriority table--may be NULL */
 101   OffsetTo<JstfModList>
 102                 extensionEnableGPOS;    /* Offset to Extension Enable GPOS
 103                                          * JstfModList table--from beginning of
 104                                          * JstfPriority table--may be NULL */
 105   OffsetTo<JstfModList>
 106                 extensionDisableGPOS;   /* Offset to Extension Disable GPOS
 107                                          * JstfModList table--from beginning of
 108                                          * JstfPriority table--may be NULL */
 109   OffsetTo<JstfMax>
 110                 extensionJstfMax;       /* Offset to Extension JstfMax table--
 111                                          * from beginning of JstfPriority table
 112                                          * --may be NULL */
 113
 114   public:
 115   DEFINE_SIZE_STATIC (20);
 116 };
 117
 118
 119 /*
 120  * JstfLangSys -- Justification Language System Table
 121  */
 122
 123 struct JstfLangSys : OffsetListOf<JstfPriority>
 124 {
 125   inline bool sanitize (hb_sanitize_context_t *c,
 126                         const Record<JstfLangSys>::sanitize_closure_t * = NULL) {
 127     TRACE_SANITIZE (this);
 128     return TRACE_RETURN (OffsetListOf<JstfPriority>::sanitize (c));
 129   }
 130 };
 131
 132
 133 /*
 134  * ExtenderGlyphs -- Extender Glyph Table
 135  */
 136
 137 typedef SortedArrayOf<GlyphID> ExtenderGlyphs;
 138
 139
 140 /*
 141  * JstfScript -- The Justification Table
 142  */
 143
 144 struct JstfScript
 145 {
 146   inline unsigned int get_lang_sys_count (void) const
 147   { return langSys.len; }
 148   inline const Tag& get_lang_sys_tag (unsigned int i) const
 149   { return langSys.get_tag (i); }
 150   inline unsigned int get_lang_sys_tags (unsigned int start_offset,
 151                                          unsigned int *lang_sys_count /* IN/OUT */,
 152                                          hb_tag_t     *lang_sys_tags /* OUT */) const
 153   { return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
 154   inline const JstfLangSys& get_lang_sys (unsigned int i) const
 155   {
 156     if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
 157     return this+langSys[i].offset;
 158   }
 159   inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
 160   { return langSys.find_index (tag, index); }
 161
 162   inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
 163   inline const JstfLangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
 164
 165   inline bool sanitize (hb_sanitize_context_t *c,
 166                         const Record<JstfScript>::sanitize_closure_t * = NULL) {
 167     TRACE_SANITIZE (this);
 168     return TRACE_RETURN (extenderGlyphs.sanitize (c, this) &&
 169                          defaultLangSys.sanitize (c, this) &&
 170                          langSys.sanitize (c, this));
 171   }
 172
 173   protected:
 174   OffsetTo<ExtenderGlyphs>
 175                 extenderGlyphs; /* Offset to ExtenderGlyph table--from beginning
 176                                  * of JstfScript table-may be NULL */
 177   OffsetTo<JstfLangSys>
 178                 defaultLangSys; /* Offset to DefaultJstfLangSys table--from
 179                                  * beginning of JstfScript table--may be Null */
 180   RecordArrayOf<JstfLangSys>
 181                 langSys;        /* Array of JstfLangSysRecords--listed
 182                                  * alphabetically by LangSysTag */
 183   public:
 184   DEFINE_SIZE_ARRAY (6, langSys);
 185 };
 186
 187
 188 /*
 189  * JSTF -- The Justification Table
 190  */
 191
 192 struct JSTF
 193 {
 194   static const hb_tag_t tableTag        = HB_OT_TAG_JSTF;
 195
 196   inline unsigned int get_script_count (void) const
 197   { return scriptList.len; }
 198   inline const Tag& get_script_tag (unsigned int i) const
 199   { return scriptList.get_tag (i); }
 200   inline unsigned int get_script_tags (unsigned int start_offset,
 201                                        unsigned int *script_count /* IN/OUT */,
 202                                        hb_tag_t     *script_tags /* OUT */) const
 203   { return scriptList.get_tags (start_offset, script_count, script_tags); }
 204   inline const JstfScript& get_script (unsigned int i) const
 205   { return this+scriptList[i].offset; }
 206   inline bool find_script_index (hb_tag_t tag, unsigned int *index) const
 207   { return scriptList.find_index (tag, index); }
 208
 209   inline bool sanitize (hb_sanitize_context_t *c) {
 210     TRACE_SANITIZE (this);
 211     return TRACE_RETURN (version.sanitize (c) && likely (version.major == 1) &&
 212                          scriptList.sanitize (c, this));
 213   }
 214
 215   protected:
 216   FixedVersion  version;        /* Version of the JSTF table--initially set
 217                                  * to 0x00010000 */
 218   RecordArrayOf<JstfScript>
 219                 scriptList;     /* Array of JstfScripts--listed
 220                                  * alphabetically by ScriptTag */
 221   public:
 222   DEFINE_SIZE_ARRAY (6, scriptList);
 223 };
 224
 225
 226 } /* namespace OT */
 227
 228
 229 #endif /* HB_OT_LAYOUT_JSTF_TABLE_HH */