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) const
  58   {
  59     TRACE_SANITIZE (this);
  60     return TRACE_RETURN (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
 124 struct JstfLangSys : OffsetListOf<JstfPriority>
 125 {
 126   inline bool sanitize (hb_sanitize_context_t *c,
 127                         const Record<JstfLangSys>::sanitize_closure_t * = NULL) const
 128   {
 129     TRACE_SANITIZE (this);
 130     return TRACE_RETURN (OffsetListOf<JstfPriority>::sanitize (c));
 131   }
 132 };
 133
 134
 135 /*
 136  * ExtenderGlyphs -- Extender Glyph Table
 137  */
 138
 139 typedef SortedArrayOf<GlyphID> ExtenderGlyphs;
 140
 141
 142 /*
 143  * JstfScript -- The Justification Table
 144  */
 145
 146 struct JstfScript
 147 {
 148   inline unsigned int get_lang_sys_count (void) const
 149   { return langSys.len; }
 150   inline const Tag& get_lang_sys_tag (unsigned int i) const
 151   { return langSys.get_tag (i); }
 152   inline 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   inline 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   inline bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
 162   { return langSys.find_index (tag, index); }
 163
 164   inline bool has_default_lang_sys (void) const { return defaultLangSys != 0; }
 165   inline const JstfLangSys& get_default_lang_sys (void) const { return this+defaultLangSys; }
 166
 167   inline bool sanitize (hb_sanitize_context_t *c,
 168                         const Record<JstfScript>::sanitize_closure_t * = NULL) const
 169   {
 170     TRACE_SANITIZE (this);
 171     return TRACE_RETURN (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 -- The Justification Table
 193  */
 194
 195 struct JSTF
 196 {
 197   static const hb_tag_t tableTag        = HB_OT_TAG_JSTF;
 198
 199   inline unsigned int get_script_count (void) const
 200   { return scriptList.len; }
 201   inline const Tag& get_script_tag (unsigned int i) const
 202   { return scriptList.get_tag (i); }
 203   inline unsigned int get_script_tags (unsigned int start_offset,
 204                                        unsigned int *script_count /* IN/OUT */,
 205                                        hb_tag_t     *script_tags /* OUT */) const
 206   { return scriptList.get_tags (start_offset, script_count, script_tags); }
 207   inline const JstfScript& get_script (unsigned int i) const
 208   { return this+scriptList[i].offset; }
 209   inline bool find_script_index (hb_tag_t tag, unsigned int *index) const
 210   { return scriptList.find_index (tag, index); }
 211
 212   inline bool sanitize (hb_sanitize_context_t *c) const
 213   {
 214     TRACE_SANITIZE (this);
 215     return TRACE_RETURN (version.sanitize (c) && likely (version.major == 1) &&
 216                          scriptList.sanitize (c, this));
 217   }
 218
 219   protected:
 220   FixedVersion  version;        /* Version of the JSTF table--initially set
 221                                  * to 0x00010000u */
 222   RecordArrayOf<JstfScript>
 223                 scriptList;     /* Array of JstfScripts--listed
 224                                  * alphabetically by ScriptTag */
 225   public:
 226   DEFINE_SIZE_ARRAY (6, scriptList);
 227 };
 228
 229
 230 } /* namespace OT */
 231
 232
 233 #endif /* HB_OT_LAYOUT_JSTF_TABLE_HH */