src/hb-aat-layout.cc

   1 /*
   2  * Copyright © 2017  Google, Inc.
   3  * Copyright © 2018  Ebrahim Byagowi
   4  *
   5  *  This is part of HarfBuzz, a text shaping library.
   6  *
   7  * Permission is hereby granted, without written agreement and without
   8  * license or royalty fees, to use, copy, modify, and distribute this
   9  * software and its documentation for any purpose, provided that the
  10  * above copyright notice and the following two paragraphs appear in
  11  * all copies of this software.
  12  *
  13  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  14  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  15  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  16  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  17  * DAMAGE.
  18  *
  19  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  20  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  21  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  22  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  23  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  24  *
  25  * Google Author(s): Behdad Esfahbod
  26  */
  27
  28 #include "hb-open-type.hh"
  29
  30 #include "hb-ot-face.hh"
  31 #include "hb-aat-layout.hh"
  32 #include "hb-aat-fdsc-table.hh" // Just so we compile it; unused otherwise.
  33 #include "hb-aat-layout-ankr-table.hh"
  34 #include "hb-aat-layout-bsln-table.hh" // Just so we compile it; unused otherwise.
  35 #include "hb-aat-layout-feat-table.hh"
  36 #include "hb-aat-layout-just-table.hh" // Just so we compile it; unused otherwise.
  37 #include "hb-aat-layout-kerx-table.hh"
  38 #include "hb-aat-layout-morx-table.hh"
  39 #include "hb-aat-layout-trak-table.hh"
  40 #include "hb-aat-ltag-table.hh"
  41
  42
  43 /**
  44  * SECTION:hb-aat-layout
  45  * @title: hb-aat-layout
  46  * @short_description: Apple Advanced Typography Layout
  47  * @include: hb-aat.h
  48  *
  49  * Functions for querying OpenType Layout features in the font face.
  50  **/
  51
  52
  53 /* Table data courtesy of Apple.  Converted from mnemonics to integers
  54  * when moving to this file. */
  55 static const hb_aat_feature_mapping_t feature_mappings[] =
  56 {
  57   {HB_TAG ('a','f','r','c'), HB_AAT_LAYOUT_FEATURE_TYPE_FRACTIONS,               HB_AAT_LAYOUT_FEATURE_SELECTOR_VERTICAL_FRACTIONS,             HB_AAT_LAYOUT_FEATURE_SELECTOR_NO_FRACTIONS},
  58   {HB_TAG ('c','2','p','c'), HB_AAT_LAYOUT_FEATURE_TYPE_UPPER_CASE,              HB_AAT_LAYOUT_FEATURE_SELECTOR_UPPER_CASE_PETITE_CAPS,         HB_AAT_LAYOUT_FEATURE_SELECTOR_DEFAULT_UPPER_CASE},
  59   {HB_TAG ('c','2','s','c'), HB_AAT_LAYOUT_FEATURE_TYPE_UPPER_CASE,              HB_AAT_LAYOUT_FEATURE_SELECTOR_UPPER_CASE_SMALL_CAPS,          HB_AAT_LAYOUT_FEATURE_SELECTOR_DEFAULT_UPPER_CASE},
  60   {HB_TAG ('c','a','l','t'), HB_AAT_LAYOUT_FEATURE_TYPE_CONTEXTUAL_ALTERNATIVES, HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_ALTERNATES_ON,       HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_ALTERNATES_OFF},
  61   {HB_TAG ('c','a','s','e'), HB_AAT_LAYOUT_FEATURE_TYPE_CASE_SENSITIVE_LAYOUT,   HB_AAT_LAYOUT_FEATURE_SELECTOR_CASE_SENSITIVE_LAYOUT_ON,       HB_AAT_LAYOUT_FEATURE_SELECTOR_CASE_SENSITIVE_LAYOUT_OFF},
  62   {HB_TAG ('c','l','i','g'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES,               HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_LIGATURES_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_LIGATURES_OFF},
  63   {HB_TAG ('c','p','s','p'), HB_AAT_LAYOUT_FEATURE_TYPE_CASE_SENSITIVE_LAYOUT,   HB_AAT_LAYOUT_FEATURE_SELECTOR_CASE_SENSITIVE_SPACING_ON,      HB_AAT_LAYOUT_FEATURE_SELECTOR_CASE_SENSITIVE_SPACING_OFF},
  64   {HB_TAG ('c','s','w','h'), HB_AAT_LAYOUT_FEATURE_TYPE_CONTEXTUAL_ALTERNATIVES, HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_SWASH_ALTERNATES_ON, HB_AAT_LAYOUT_FEATURE_SELECTOR_CONTEXTUAL_SWASH_ALTERNATES_OFF},
  65   {HB_TAG ('d','l','i','g'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES,               HB_AAT_LAYOUT_FEATURE_SELECTOR_RARE_LIGATURES_ON,              HB_AAT_LAYOUT_FEATURE_SELECTOR_RARE_LIGATURES_OFF},
  66   {HB_TAG ('e','x','p','t'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_EXPERT_CHARACTERS,              (hb_aat_layout_feature_selector_t) 16},
  67   {HB_TAG ('f','r','a','c'), HB_AAT_LAYOUT_FEATURE_TYPE_FRACTIONS,               HB_AAT_LAYOUT_FEATURE_SELECTOR_DIAGONAL_FRACTIONS,             HB_AAT_LAYOUT_FEATURE_SELECTOR_NO_FRACTIONS},
  68   {HB_TAG ('f','w','i','d'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_MONOSPACED_TEXT,                (hb_aat_layout_feature_selector_t) 7},
  69   {HB_TAG ('h','a','l','t'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_ALT_HALF_WIDTH_TEXT,            (hb_aat_layout_feature_selector_t) 7},
  70   {HB_TAG ('h','i','s','t'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES,               HB_AAT_LAYOUT_FEATURE_SELECTOR_HISTORICAL_LIGATURES_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_HISTORICAL_LIGATURES_OFF},
  71   {HB_TAG ('h','k','n','a'), HB_AAT_LAYOUT_FEATURE_TYPE_ALTERNATE_KANA,          HB_AAT_LAYOUT_FEATURE_SELECTOR_ALTERNATE_HORIZ_KANA_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_ALTERNATE_HORIZ_KANA_OFF},
  72   {HB_TAG ('h','l','i','g'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES,               HB_AAT_LAYOUT_FEATURE_SELECTOR_HISTORICAL_LIGATURES_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_HISTORICAL_LIGATURES_OFF},
  73   {HB_TAG ('h','n','g','l'), HB_AAT_LAYOUT_FEATURE_TYPE_TRANSLITERATION,         HB_AAT_LAYOUT_FEATURE_SELECTOR_HANJA_TO_HANGUL,                HB_AAT_LAYOUT_FEATURE_SELECTOR_NO_TRANSLITERATION},
  74   {HB_TAG ('h','o','j','o'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_HOJO_CHARACTERS,                (hb_aat_layout_feature_selector_t) 16},
  75   {HB_TAG ('h','w','i','d'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_HALF_WIDTH_TEXT,                (hb_aat_layout_feature_selector_t) 7},
  76   {HB_TAG ('i','t','a','l'), HB_AAT_LAYOUT_FEATURE_TYPE_ITALIC_CJK_ROMAN,        HB_AAT_LAYOUT_FEATURE_SELECTOR_CJK_ITALIC_ROMAN_ON,            HB_AAT_LAYOUT_FEATURE_SELECTOR_CJK_ITALIC_ROMAN_OFF},
  77   {HB_TAG ('j','p','0','4'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_JIS2004_CHARACTERS,             (hb_aat_layout_feature_selector_t) 16},
  78   {HB_TAG ('j','p','7','8'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_JIS1978_CHARACTERS,             (hb_aat_layout_feature_selector_t) 16},
  79   {HB_TAG ('j','p','8','3'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_JIS1983_CHARACTERS,             (hb_aat_layout_feature_selector_t) 16},
  80   {HB_TAG ('j','p','9','0'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_JIS1990_CHARACTERS,             (hb_aat_layout_feature_selector_t) 16},
  81   {HB_TAG ('l','i','g','a'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES,               HB_AAT_LAYOUT_FEATURE_SELECTOR_COMMON_LIGATURES_ON,            HB_AAT_LAYOUT_FEATURE_SELECTOR_COMMON_LIGATURES_OFF},
  82   {HB_TAG ('l','n','u','m'), HB_AAT_LAYOUT_FEATURE_TYPE_NUMBER_CASE,             HB_AAT_LAYOUT_FEATURE_SELECTOR_UPPER_CASE_NUMBERS,             (hb_aat_layout_feature_selector_t) 2},
  83   {HB_TAG ('m','g','r','k'), HB_AAT_LAYOUT_FEATURE_TYPE_MATHEMATICAL_EXTRAS,     HB_AAT_LAYOUT_FEATURE_SELECTOR_MATHEMATICAL_GREEK_ON,          HB_AAT_LAYOUT_FEATURE_SELECTOR_MATHEMATICAL_GREEK_OFF},
  84   {HB_TAG ('n','l','c','k'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_NLCCHARACTERS,                  (hb_aat_layout_feature_selector_t) 16},
  85   {HB_TAG ('o','n','u','m'), HB_AAT_LAYOUT_FEATURE_TYPE_NUMBER_CASE,             HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_NUMBERS,             (hb_aat_layout_feature_selector_t) 2},
  86   {HB_TAG ('o','r','d','n'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_POSITION,       HB_AAT_LAYOUT_FEATURE_SELECTOR_ORDINALS,                       HB_AAT_LAYOUT_FEATURE_SELECTOR_NORMAL_POSITION},
  87   {HB_TAG ('p','a','l','t'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_ALT_PROPORTIONAL_TEXT,          (hb_aat_layout_feature_selector_t) 7},
  88   {HB_TAG ('p','c','a','p'), HB_AAT_LAYOUT_FEATURE_TYPE_LOWER_CASE,              HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_PETITE_CAPS,         HB_AAT_LAYOUT_FEATURE_SELECTOR_DEFAULT_LOWER_CASE},
  89   {HB_TAG ('p','k','n','a'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_PROPORTIONAL_TEXT,              (hb_aat_layout_feature_selector_t) 7},
  90   {HB_TAG ('p','n','u','m'), HB_AAT_LAYOUT_FEATURE_TYPE_NUMBER_SPACING,          HB_AAT_LAYOUT_FEATURE_SELECTOR_PROPORTIONAL_NUMBERS,           (hb_aat_layout_feature_selector_t) 4},
  91   {HB_TAG ('p','w','i','d'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_PROPORTIONAL_TEXT,              (hb_aat_layout_feature_selector_t) 7},
  92   {HB_TAG ('q','w','i','d'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_QUARTER_WIDTH_TEXT,             (hb_aat_layout_feature_selector_t) 7},
  93   {HB_TAG ('r','u','b','y'), HB_AAT_LAYOUT_FEATURE_TYPE_RUBY_KANA,               HB_AAT_LAYOUT_FEATURE_SELECTOR_RUBY_KANA_ON,                   HB_AAT_LAYOUT_FEATURE_SELECTOR_RUBY_KANA_OFF},
  94   {HB_TAG ('s','i','n','f'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_POSITION,       HB_AAT_LAYOUT_FEATURE_SELECTOR_SCIENTIFIC_INFERIORS,           HB_AAT_LAYOUT_FEATURE_SELECTOR_NORMAL_POSITION},
  95   {HB_TAG ('s','m','c','p'), HB_AAT_LAYOUT_FEATURE_TYPE_LOWER_CASE,              HB_AAT_LAYOUT_FEATURE_SELECTOR_LOWER_CASE_SMALL_CAPS,          HB_AAT_LAYOUT_FEATURE_SELECTOR_DEFAULT_LOWER_CASE},
  96   {HB_TAG ('s','m','p','l'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_SIMPLIFIED_CHARACTERS,          (hb_aat_layout_feature_selector_t) 16},
  97   {HB_TAG ('s','s','0','1'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_ONE_ON,           HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_ONE_OFF},
  98   {HB_TAG ('s','s','0','2'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWO_ON,           HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWO_OFF},
  99   {HB_TAG ('s','s','0','3'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_THREE_ON,         HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_THREE_OFF},
 100   {HB_TAG ('s','s','0','4'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FOUR_ON,          HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FOUR_OFF},
 101   {HB_TAG ('s','s','0','5'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FIVE_ON,          HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FIVE_OFF},
 102   {HB_TAG ('s','s','0','6'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SIX_ON,           HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SIX_OFF},
 103   {HB_TAG ('s','s','0','7'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SEVEN_ON,         HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SEVEN_OFF},
 104   {HB_TAG ('s','s','0','8'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_EIGHT_ON,         HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_EIGHT_OFF},
 105   {HB_TAG ('s','s','0','9'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_NINE_ON,          HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_NINE_OFF},
 106   {HB_TAG ('s','s','1','0'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TEN_ON,           HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TEN_OFF},
 107   {HB_TAG ('s','s','1','1'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_ELEVEN_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_ELEVEN_OFF},
 108   {HB_TAG ('s','s','1','2'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWELVE_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWELVE_OFF},
 109   {HB_TAG ('s','s','1','3'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_THIRTEEN_ON,      HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_THIRTEEN_OFF},
 110   {HB_TAG ('s','s','1','4'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FOURTEEN_ON,      HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FOURTEEN_OFF},
 111   {HB_TAG ('s','s','1','5'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FIFTEEN_ON,       HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_FIFTEEN_OFF},
 112   {HB_TAG ('s','s','1','6'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SIXTEEN_ON,       HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SIXTEEN_OFF},
 113   {HB_TAG ('s','s','1','7'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SEVENTEEN_ON,     HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_SEVENTEEN_OFF},
 114   {HB_TAG ('s','s','1','8'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_EIGHTEEN_ON,      HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_EIGHTEEN_OFF},
 115   {HB_TAG ('s','s','1','9'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_NINETEEN_ON,      HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_NINETEEN_OFF},
 116   {HB_TAG ('s','s','2','0'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLISTIC_ALTERNATIVES,  HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWENTY_ON,        HB_AAT_LAYOUT_FEATURE_SELECTOR_STYLISTIC_ALT_TWENTY_OFF},
 117   {HB_TAG ('s','u','b','s'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_POSITION,       HB_AAT_LAYOUT_FEATURE_SELECTOR_INFERIORS,                      HB_AAT_LAYOUT_FEATURE_SELECTOR_NORMAL_POSITION},
 118   {HB_TAG ('s','u','p','s'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_POSITION,       HB_AAT_LAYOUT_FEATURE_SELECTOR_SUPERIORS,                      HB_AAT_LAYOUT_FEATURE_SELECTOR_NORMAL_POSITION},
 119   {HB_TAG ('s','w','s','h'), HB_AAT_LAYOUT_FEATURE_TYPE_CONTEXTUAL_ALTERNATIVES, HB_AAT_LAYOUT_FEATURE_SELECTOR_SWASH_ALTERNATES_ON,            HB_AAT_LAYOUT_FEATURE_SELECTOR_SWASH_ALTERNATES_OFF},
 120   {HB_TAG ('t','i','t','l'), HB_AAT_LAYOUT_FEATURE_TYPE_STYLE_OPTIONS,           HB_AAT_LAYOUT_FEATURE_SELECTOR_TITLING_CAPS,                   HB_AAT_LAYOUT_FEATURE_SELECTOR_NO_STYLE_OPTIONS},
 121   {HB_TAG ('t','n','a','m'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_TRADITIONAL_NAMES_CHARACTERS,   (hb_aat_layout_feature_selector_t) 16},
 122   {HB_TAG ('t','n','u','m'), HB_AAT_LAYOUT_FEATURE_TYPE_NUMBER_SPACING,          HB_AAT_LAYOUT_FEATURE_SELECTOR_MONOSPACED_NUMBERS,             (hb_aat_layout_feature_selector_t) 4},
 123   {HB_TAG ('t','r','a','d'), HB_AAT_LAYOUT_FEATURE_TYPE_CHARACTER_SHAPE,         HB_AAT_LAYOUT_FEATURE_SELECTOR_TRADITIONAL_CHARACTERS,         (hb_aat_layout_feature_selector_t) 16},
 124   {HB_TAG ('t','w','i','d'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_THIRD_WIDTH_TEXT,               (hb_aat_layout_feature_selector_t) 7},
 125   {HB_TAG ('u','n','i','c'), HB_AAT_LAYOUT_FEATURE_TYPE_LETTER_CASE,             (hb_aat_layout_feature_selector_t) 14,                 (hb_aat_layout_feature_selector_t) 15},
 126   {HB_TAG ('v','a','l','t'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_ALT_PROPORTIONAL_TEXT,          (hb_aat_layout_feature_selector_t) 7},
 127   {HB_TAG ('v','e','r','t'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_SUBSTITUTION,   HB_AAT_LAYOUT_FEATURE_SELECTOR_SUBSTITUTE_VERTICAL_FORMS_ON,   HB_AAT_LAYOUT_FEATURE_SELECTOR_SUBSTITUTE_VERTICAL_FORMS_OFF},
 128   {HB_TAG ('v','h','a','l'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_ALT_HALF_WIDTH_TEXT,            (hb_aat_layout_feature_selector_t) 7},
 129   {HB_TAG ('v','k','n','a'), HB_AAT_LAYOUT_FEATURE_TYPE_ALTERNATE_KANA,          HB_AAT_LAYOUT_FEATURE_SELECTOR_ALTERNATE_VERT_KANA_ON,         HB_AAT_LAYOUT_FEATURE_SELECTOR_ALTERNATE_VERT_KANA_OFF},
 130   {HB_TAG ('v','p','a','l'), HB_AAT_LAYOUT_FEATURE_TYPE_TEXT_SPACING,            HB_AAT_LAYOUT_FEATURE_SELECTOR_ALT_PROPORTIONAL_TEXT,          (hb_aat_layout_feature_selector_t) 7},
 131   {HB_TAG ('v','r','t','2'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_SUBSTITUTION,   HB_AAT_LAYOUT_FEATURE_SELECTOR_SUBSTITUTE_VERTICAL_FORMS_ON,   HB_AAT_LAYOUT_FEATURE_SELECTOR_SUBSTITUTE_VERTICAL_FORMS_OFF},
 132   {HB_TAG ('z','e','r','o'), HB_AAT_LAYOUT_FEATURE_TYPE_TYPOGRAPHIC_EXTRAS,      HB_AAT_LAYOUT_FEATURE_SELECTOR_SLASHED_ZERO_ON,                HB_AAT_LAYOUT_FEATURE_SELECTOR_SLASHED_ZERO_OFF},
 133 };
 134
 135 const hb_aat_feature_mapping_t *
 136 hb_aat_layout_find_feature_mapping (hb_tag_t tag)
 137 {
 138   return (const hb_aat_feature_mapping_t *) bsearch (&tag,
 139                                                      feature_mappings,
 140                                                      ARRAY_LENGTH (feature_mappings),
 141                                                      sizeof (feature_mappings[0]),
 142                                                      hb_aat_feature_mapping_t::cmp);
 143 }
 144
 145
 146 /*
 147  * hb_aat_apply_context_t
 148  */
 149
 150 AAT::hb_aat_apply_context_t::hb_aat_apply_context_t (const hb_ot_shape_plan_t *plan_,
 151                                                      hb_font_t *font_,
 152                                                      hb_buffer_t *buffer_,
 153                                                      hb_blob_t *blob) :
 154                                                        plan (plan_),
 155                                                        font (font_),
 156                                                        face (font->face),
 157                                                        buffer (buffer_),
 158                                                        sanitizer (),
 159                                                        ankr_table (&Null(AAT::ankr)),
 160                                                        lookup_index (0),
 161                                                        debug_depth (0)
 162 {
 163   sanitizer.init (blob);
 164   sanitizer.set_num_glyphs (face->get_num_glyphs ());
 165   sanitizer.start_processing ();
 166   sanitizer.set_max_ops (HB_SANITIZE_MAX_OPS_MAX);
 167 }
 168
 169 AAT::hb_aat_apply_context_t::~hb_aat_apply_context_t ()
 170 { sanitizer.end_processing (); }
 171
 172 void
 173 AAT::hb_aat_apply_context_t::set_ankr_table (const AAT::ankr *ankr_table_)
 174 { ankr_table = ankr_table_; }
 175
 176
 177 /*
 178  * mort/morx/kerx/trak
 179  */
 180
 181
 182 void
 183 hb_aat_layout_compile_map (const hb_aat_map_builder_t *mapper,
 184                            hb_aat_map_t *map)
 185 {
 186   const AAT::morx& morx = *mapper->face->table.morx;
 187   if (morx.has_data ())
 188   {
 189     morx.compile_flags (mapper, map);
 190     return;
 191   }
 192
 193   const AAT::mort& mort = *mapper->face->table.mort;
 194   if (mort.has_data ())
 195   {
 196     mort.compile_flags (mapper, map);
 197     return;
 198   }
 199 }
 200
 201
 202 /*
 203  * hb_aat_layout_has_substitution:
 204  * @face:
 205  *
 206  * Returns:
 207  * Since: 2.3.0
 208  */
 209 hb_bool_t
 210 hb_aat_layout_has_substitution (hb_face_t *face)
 211 {
 212   return face->table.morx->has_data () ||
 213          face->table.mort->has_data ();
 214 }
 215
 216 void
 217 hb_aat_layout_substitute (const hb_ot_shape_plan_t *plan,
 218                           hb_font_t *font,
 219                           hb_buffer_t *buffer)
 220 {
 221   hb_blob_t *morx_blob = font->face->table.morx.get_blob ();
 222   const AAT::morx& morx = *morx_blob->as<AAT::morx> ();
 223   if (morx.has_data ())
 224   {
 225     AAT::hb_aat_apply_context_t c (plan, font, buffer, morx_blob);
 226     morx.apply (&c);
 227     return;
 228   }
 229
 230   hb_blob_t *mort_blob = font->face->table.mort.get_blob ();
 231   const AAT::mort& mort = *mort_blob->as<AAT::mort> ();
 232   if (mort.has_data ())
 233   {
 234     AAT::hb_aat_apply_context_t c (plan, font, buffer, mort_blob);
 235     mort.apply (&c);
 236     return;
 237   }
 238 }
 239
 240 void
 241 hb_aat_layout_zero_width_deleted_glyphs (hb_buffer_t *buffer)
 242 {
 243   unsigned int count = buffer->len;
 244   hb_glyph_info_t *info = buffer->info;
 245   hb_glyph_position_t *pos = buffer->pos;
 246   for (unsigned int i = 0; i < count; i++)
 247     if (unlikely (info[i].codepoint == AAT::DELETED_GLYPH))
 248       pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
 249 }
 250
 251 static bool
 252 is_deleted_glyph (const hb_glyph_info_t *info)
 253 {
 254   return info->codepoint == AAT::DELETED_GLYPH;
 255 }
 256
 257 void
 258 hb_aat_layout_remove_deleted_glyphs (hb_buffer_t *buffer)
 259 {
 260   hb_ot_layout_delete_glyphs_inplace (buffer, is_deleted_glyph);
 261 }
 262
 263 /*
 264  * hb_aat_layout_has_positioning:
 265  * @face:
 266  *
 267  * Returns:
 268  * Since: 2.3.0
 269  */
 270 hb_bool_t
 271 hb_aat_layout_has_positioning (hb_face_t *face)
 272 {
 273   return face->table.kerx->has_data ();
 274 }
 275
 276 void
 277 hb_aat_layout_position (const hb_ot_shape_plan_t *plan,
 278                         hb_font_t *font,
 279                         hb_buffer_t *buffer)
 280 {
 281   hb_blob_t *kerx_blob = font->face->table.kerx.get_blob ();
 282   const AAT::kerx& kerx = *kerx_blob->as<AAT::kerx> ();
 283
 284   AAT::hb_aat_apply_context_t c (plan, font, buffer, kerx_blob);
 285   c.set_ankr_table (font->face->table.ankr.get ());
 286   kerx.apply (&c);
 287 }
 288
 289
 290 /*
 291  * hb_aat_layout_has_tracking:
 292  * @face:
 293  *
 294  * Returns:
 295  * Since: 2.3.0
 296  */
 297 hb_bool_t
 298 hb_aat_layout_has_tracking (hb_face_t *face)
 299 {
 300   return face->table.trak->has_data ();
 301 }
 302
 303 void
 304 hb_aat_layout_track (const hb_ot_shape_plan_t *plan,
 305                      hb_font_t *font,
 306                      hb_buffer_t *buffer)
 307 {
 308   const AAT::trak& trak = *font->face->table.trak;
 309
 310   AAT::hb_aat_apply_context_t c (plan, font, buffer);
 311   trak.apply (&c);
 312 }
 313
 314
 315 hb_language_t
 316 _hb_aat_language_get (hb_face_t *face,
 317                       unsigned int i)
 318 {
 319   return face->table.ltag->get_language (i);
 320 }
 321
 322 /**
 323  * hb_aat_layout_get_feature_types:
 324  * @face: a face object
 325  * @start_offset: iteration's start offset
 326  * @feature_count:(inout) (allow-none): buffer size as input, filled size as output
 327  * @features: (out caller-allocates) (array length=feature_count): features buffer
 328  *
 329  * Return value: Number of all available feature types.
 330  *
 331  * Since: 2.2.0
 332  */
 333 unsigned int
 334 hb_aat_layout_get_feature_types (hb_face_t                    *face,
 335                                  unsigned int                  start_offset,
 336                                  unsigned int                 *feature_count, /* IN/OUT.  May be NULL. */
 337                                  hb_aat_layout_feature_type_t *features       /* OUT.     May be NULL. */)
 338 {
 339   return face->table.feat->get_feature_types (start_offset, feature_count, features);
 340 }
 341
 342 /**
 343  * hb_aat_layout_feature_type_get_name_id:
 344  * @face: a face object
 345  * @feature_type: feature id
 346  *
 347  * Return value: Name ID index
 348  *
 349  * Since: 2.2.0
 350  */
 351 hb_ot_name_id_t
 352 hb_aat_layout_feature_type_get_name_id (hb_face_t                    *face,
 353                                         hb_aat_layout_feature_type_t  feature_type)
 354 {
 355   return face->table.feat->get_feature_name_id (feature_type);
 356 }
 357
 358 /**
 359  * hb_aat_layout_feature_type_get_selectors:
 360  * @face:    a face object
 361  * @feature_type: feature id
 362  * @start_offset:    iteration's start offset
 363  * @selector_count: (inout) (allow-none): buffer size as input, filled size as output
 364  * @selectors: (out caller-allocates) (array length=selector_count): settings buffer
 365  * @default_index: (out) (allow-none): index of default selector if any
 366  *
 367  * If upon return, @default_index is set to #HB_AAT_LAYOUT_NO_SELECTOR_INDEX, then
 368  * the feature type is non-exclusive.  Otherwise, @default_index is the index of
 369  * the selector that is selected by default.
 370  *
 371  * Return value: Number of all available feature selectors.
 372  *
 373  * Since: 2.2.0
 374  */
 375 unsigned int
 376 hb_aat_layout_feature_type_get_selector_infos (hb_face_t                             *face,
 377                                                hb_aat_layout_feature_type_t           feature_type,
 378                                                unsigned int                           start_offset,
 379                                                unsigned int                          *selector_count, /* IN/OUT.  May be NULL. */
 380                                                hb_aat_layout_feature_selector_info_t *selectors,      /* OUT.     May be NULL. */
 381                                                unsigned int                          *default_index   /* OUT.     May be NULL. */)
 382 {
 383   return face->table.feat->get_selector_infos (feature_type, start_offset, selector_count, selectors, default_index);
 384 }