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.hh"
  29
  30 #include "hb-aat-layout.hh"
  31 #include "hb-aat-fdsc-table.hh" // Just so we compile it; unused otherwise.
  32 #include "hb-aat-layout-ankr-table.hh"
  33 #include "hb-aat-layout-bsln-table.hh" // Just so we compile it; unused otherwise.
  34 #include "hb-aat-layout-feat-table.hh"
  35 #include "hb-aat-layout-just-table.hh" // Just so we compile it; unused otherwise.
  36 #include "hb-aat-layout-kerx-table.hh"
  37 #include "hb-aat-layout-morx-table.hh"
  38 #include "hb-aat-layout-trak-table.hh"
  39 #include "hb-aat-ltag-table.hh"
  40
  41
  42 /*
  43  * hb_aat_apply_context_t
  44  */
  45
  46 /* Note: This context is used for kerning, even without AAT, hence the condition. */
  47 #if !defined(HB_NO_AAT) || !defined(HB_NO_OT_KERN)
  48
  49 AAT::hb_aat_apply_context_t::hb_aat_apply_context_t (const hb_ot_shape_plan_t *plan_,
  50                                                      hb_font_t *font_,
  51                                                      hb_buffer_t *buffer_,
  52                                                      hb_blob_t *blob) :
  53                                                        plan (plan_),
  54                                                        font (font_),
  55                                                        face (font->face),
  56                                                        buffer (buffer_),
  57                                                        sanitizer (),
  58                                                        ankr_table (&Null (AAT::ankr)),
  59                                                        lookup_index (0),
  60                                                        debug_depth (0)
  61 {
  62   sanitizer.init (blob);
  63   sanitizer.set_num_glyphs (face->get_num_glyphs ());
  64   sanitizer.start_processing ();
  65   sanitizer.set_max_ops (HB_SANITIZE_MAX_OPS_MAX);
  66 }
  67
  68 AAT::hb_aat_apply_context_t::~hb_aat_apply_context_t ()
  69 { sanitizer.end_processing (); }
  70
  71 void
  72 AAT::hb_aat_apply_context_t::set_ankr_table (const AAT::ankr *ankr_table_)
  73 { ankr_table = ankr_table_; }
  74
  75 #endif
  76
  77
  78 /**
  79  * SECTION:hb-aat-layout
  80  * @title: hb-aat-layout
  81  * @short_description: Apple Advanced Typography Layout
  82  * @include: hb-aat.h
  83  *
  84  * Functions for querying OpenType Layout features in the font face.
  85  **/
  86
  87
  88 #if !defined(HB_NO_AAT) || defined(HAVE_CORETEXT)
  89
  90 /* Table data courtesy of Apple.  Converted from mnemonics to integers
  91  * when moving to this file. */
  92 static const hb_aat_feature_mapping_t feature_mappings[] =
  93 {
  94   {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},
  95   {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},
  96   {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},
  97   {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},
  98   {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},
  99   {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},
 100   {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},
 101   {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},
 102   {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},
 103   {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},
 104   {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},
 105   {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},
 106   {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},
 107   {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},
 108   {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},
 109   {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},
 110   {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},
 111   {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},
 112   {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},
 113   {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},
 114   {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},
 115   {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},
 116   {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},
 117   {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},
 118   {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},
 119   {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},
 120   {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},
 121   {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},
 122   {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},
 123   {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},
 124   {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},
 125   {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},
 126   {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},
 127   {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},
 128   {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},
 129   {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},
 130   {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},
 131   {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},
 132   {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},
 133   {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},
 134   {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},
 135   {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},
 136   {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},
 137   {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},
 138   {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},
 139   {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},
 140   {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},
 141   {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},
 142   {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},
 143   {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},
 144   {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},
 145   {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},
 146   {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},
 147   {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},
 148   {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},
 149   {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},
 150   {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},
 151   {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},
 152   {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},
 153   {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},
 154   {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},
 155   {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},
 156   {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},
 157   {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},
 158   {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},
 159   {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},
 160   {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},
 161   {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},
 162   {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},
 163   {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},
 164   {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},
 165   {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},
 166   {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},
 167   {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},
 168   {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},
 169   {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},
 170 };
 171
 172 const hb_aat_feature_mapping_t *
 173 hb_aat_layout_find_feature_mapping (hb_tag_t tag)
 174 {
 175   return hb_sorted_array (feature_mappings).bsearch (tag);
 176 }
 177 #endif
 178
 179
 180 #ifndef HB_NO_AAT
 181
 182 /*
 183  * mort/morx/kerx/trak
 184  */
 185
 186
 187 void
 188 hb_aat_layout_compile_map (const hb_aat_map_builder_t *mapper,
 189                            hb_aat_map_t *map)
 190 {
 191   const AAT::morx& morx = *mapper->face->table.morx;
 192   if (morx.has_data ())
 193   {
 194     morx.compile_flags (mapper, map);
 195     return;
 196   }
 197
 198   const AAT::mort& mort = *mapper->face->table.mort;
 199   if (mort.has_data ())
 200   {
 201     mort.compile_flags (mapper, map);
 202     return;
 203   }
 204 }
 205
 206
 207 /*
 208  * hb_aat_layout_has_substitution:
 209  * @face:
 210  *
 211  * Returns:
 212  * Since: 2.3.0
 213  */
 214 hb_bool_t
 215 hb_aat_layout_has_substitution (hb_face_t *face)
 216 {
 217   return face->table.morx->has_data () ||
 218          face->table.mort->has_data ();
 219 }
 220
 221 void
 222 hb_aat_layout_substitute (const hb_ot_shape_plan_t *plan,
 223                           hb_font_t *font,
 224                           hb_buffer_t *buffer)
 225 {
 226   hb_blob_t *morx_blob = font->face->table.morx.get_blob ();
 227   const AAT::morx& morx = *morx_blob->as<AAT::morx> ();
 228   if (morx.has_data ())
 229   {
 230     AAT::hb_aat_apply_context_t c (plan, font, buffer, morx_blob);
 231     morx.apply (&c);
 232     return;
 233   }
 234
 235   hb_blob_t *mort_blob = font->face->table.mort.get_blob ();
 236   const AAT::mort& mort = *mort_blob->as<AAT::mort> ();
 237   if (mort.has_data ())
 238   {
 239     AAT::hb_aat_apply_context_t c (plan, font, buffer, mort_blob);
 240     mort.apply (&c);
 241     return;
 242   }
 243 }
 244
 245 void
 246 hb_aat_layout_zero_width_deleted_glyphs (hb_buffer_t *buffer)
 247 {
 248   unsigned int count = buffer->len;
 249   hb_glyph_info_t *info = buffer->info;
 250   hb_glyph_position_t *pos = buffer->pos;
 251   for (unsigned int i = 0; i < count; i++)
 252     if (unlikely (info[i].codepoint == AAT::DELETED_GLYPH))
 253       pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
 254 }
 255
 256 static bool
 257 is_deleted_glyph (const hb_glyph_info_t *info)
 258 {
 259   return info->codepoint == AAT::DELETED_GLYPH;
 260 }
 261
 262 void
 263 hb_aat_layout_remove_deleted_glyphs (hb_buffer_t *buffer)
 264 {
 265   hb_ot_layout_delete_glyphs_inplace (buffer, is_deleted_glyph);
 266 }
 267
 268 /*
 269  * hb_aat_layout_has_positioning:
 270  * @face:
 271  *
 272  * Returns:
 273  * Since: 2.3.0
 274  */
 275 hb_bool_t
 276 hb_aat_layout_has_positioning (hb_face_t *face)
 277 {
 278   return face->table.kerx->has_data ();
 279 }
 280
 281 void
 282 hb_aat_layout_position (const hb_ot_shape_plan_t *plan,
 283                         hb_font_t *font,
 284                         hb_buffer_t *buffer)
 285 {
 286   hb_blob_t *kerx_blob = font->face->table.kerx.get_blob ();
 287   const AAT::kerx& kerx = *kerx_blob->as<AAT::kerx> ();
 288
 289   AAT::hb_aat_apply_context_t c (plan, font, buffer, kerx_blob);
 290   c.set_ankr_table (font->face->table.ankr.get ());
 291   kerx.apply (&c);
 292 }
 293
 294
 295 /*
 296  * hb_aat_layout_has_tracking:
 297  * @face:
 298  *
 299  * Returns:
 300  * Since: 2.3.0
 301  */
 302 hb_bool_t
 303 hb_aat_layout_has_tracking (hb_face_t *face)
 304 {
 305   return face->table.trak->has_data ();
 306 }
 307
 308 void
 309 hb_aat_layout_track (const hb_ot_shape_plan_t *plan,
 310                      hb_font_t *font,
 311                      hb_buffer_t *buffer)
 312 {
 313   const AAT::trak& trak = *font->face->table.trak;
 314
 315   AAT::hb_aat_apply_context_t c (plan, font, buffer);
 316   trak.apply (&c);
 317 }
 318
 319 /**
 320  * hb_aat_layout_get_feature_types:
 321  * @face: a face object
 322  * @start_offset: iteration's start offset
 323  * @feature_count:(inout) (allow-none): buffer size as input, filled size as output
 324  * @features: (out caller-allocates) (array length=feature_count): features buffer
 325  *
 326  * Return value: Number of all available feature types.
 327  *
 328  * Since: 2.2.0
 329  */
 330 unsigned int
 331 hb_aat_layout_get_feature_types (hb_face_t                    *face,
 332                                  unsigned int                  start_offset,
 333                                  unsigned int                 *feature_count, /* IN/OUT.  May be NULL. */
 334                                  hb_aat_layout_feature_type_t *features       /* OUT.     May be NULL. */)
 335 {
 336   return face->table.feat->get_feature_types (start_offset, feature_count, features);
 337 }
 338
 339 /**
 340  * hb_aat_layout_feature_type_get_name_id:
 341  * @face: a face object
 342  * @feature_type: feature id
 343  *
 344  * Return value: Name ID index
 345  *
 346  * Since: 2.2.0
 347  */
 348 hb_ot_name_id_t
 349 hb_aat_layout_feature_type_get_name_id (hb_face_t                    *face,
 350                                         hb_aat_layout_feature_type_t  feature_type)
 351 {
 352   return face->table.feat->get_feature_name_id (feature_type);
 353 }
 354
 355 /**
 356  * hb_aat_layout_feature_type_get_selectors:
 357  * @face:    a face object
 358  * @feature_type: feature id
 359  * @start_offset:    iteration's start offset
 360  * @selector_count: (inout) (allow-none): buffer size as input, filled size as output
 361  * @selectors: (out caller-allocates) (array length=selector_count): settings buffer
 362  * @default_index: (out) (allow-none): index of default selector if any
 363  *
 364  * If upon return, @default_index is set to #HB_AAT_LAYOUT_NO_SELECTOR_INDEX, then
 365  * the feature type is non-exclusive.  Otherwise, @default_index is the index of
 366  * the selector that is selected by default.
 367  *
 368  * Return value: Number of all available feature selectors.
 369  *
 370  * Since: 2.2.0
 371  */
 372 unsigned int
 373 hb_aat_layout_feature_type_get_selector_infos (hb_face_t                             *face,
 374                                                hb_aat_layout_feature_type_t           feature_type,
 375                                                unsigned int                           start_offset,
 376                                                unsigned int                          *selector_count, /* IN/OUT.  May be NULL. */
 377                                                hb_aat_layout_feature_selector_info_t *selectors,      /* OUT.     May be NULL. */
 378                                                unsigned int                          *default_index   /* OUT.     May be NULL. */)
 379 {
 380   return face->table.feat->get_selector_infos (feature_type, start_offset, selector_count, selectors, default_index);
 381 }
 382
 383
 384 #endif