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-layout-ankr-table.hh"
32 #include "hb-aat-layout-bsln-table.hh" // Just so we compile it; unused otherwise.
33 #include "hb-aat-layout-feat-table.hh"
34 #include "hb-aat-layout-just-table.hh" // Just so we compile it; unused otherwise.
35 #include "hb-aat-layout-kerx-table.hh"
36 #include "hb-aat-layout-morx-table.hh"
37 #include "hb-aat-layout-trak-table.hh"
38 #include "hb-aat-ltag-table.hh"
39
40
41 /*
42 * hb_aat_apply_context_t
43 */
44
45 /* Note: This context is used for kerning, even without AAT, hence the condition. */
46 #if !defined(HB_NO_AAT) || !defined(HB_NO_OT_KERN)
47
hb_aat_apply_context_t(const hb_ot_shape_plan_t * plan_,hb_font_t * font_,hb_buffer_t * buffer_,hb_blob_t * blob)48 AAT::hb_aat_apply_context_t::hb_aat_apply_context_t (const hb_ot_shape_plan_t *plan_,
49 hb_font_t *font_,
50 hb_buffer_t *buffer_,
51 hb_blob_t *blob) :
52 plan (plan_),
53 font (font_),
54 face (font->face),
55 buffer (buffer_),
56 sanitizer (),
57 ankr_table (&Null (AAT::ankr)),
58 gdef_table (
59 #ifndef HB_NO_OT_LAYOUT
60 face->table.GDEF->table
61 #else
62 &Null (GDEF)
63 #endif
64 ),
65 lookup_index (0)
66 {
67 sanitizer.init (blob);
68 sanitizer.set_num_glyphs (face->get_num_glyphs ());
69 sanitizer.start_processing ();
70 sanitizer.set_max_ops (HB_SANITIZE_MAX_OPS_MAX);
71 }
72
~hb_aat_apply_context_t()73 AAT::hb_aat_apply_context_t::~hb_aat_apply_context_t ()
74 { sanitizer.end_processing (); }
75
76 void
set_ankr_table(const AAT::ankr * ankr_table_)77 AAT::hb_aat_apply_context_t::set_ankr_table (const AAT::ankr *ankr_table_)
78 { ankr_table = ankr_table_; }
79
80 #endif
81
82
83 /**
84 * SECTION:hb-aat-layout
85 * @title: hb-aat-layout
86 * @short_description: Apple Advanced Typography Layout
87 * @include: hb-aat.h
88 *
89 * Functions for querying AAT Layout features in the font face.
90 *
91 * HarfBuzz supports all of the AAT tables used to implement shaping. Other
92 * AAT tables and their associated features are not supported.
93 **/
94
95
96 #if !defined(HB_NO_AAT) || defined(HAVE_CORETEXT)
97
98 /* Mapping from OpenType feature tags to AAT feature names and selectors.
99 *
100 * Table data courtesy of Apple. Converted from mnemonics to integers
101 * when moving to this file. */
102 static const hb_aat_feature_mapping_t feature_mappings[] =
103 {
104 {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},
105 {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},
106 {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},
107 {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},
108 {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},
109 {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},
110 {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},
111 {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},
112 {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},
113 {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},
114 {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},
115 {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},
116 {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},
117 {HB_TAG ('h','i','s','t'), (hb_aat_layout_feature_type_t) 40, (hb_aat_layout_feature_selector_t) 0, (hb_aat_layout_feature_selector_t) 1},
118 {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},
119 {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},
120 {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},
121 {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},
122 {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},
123 {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},
124 {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},
125 {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},
126 {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},
127 {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},
128 {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},
129 {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},
130 {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},
131 {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},
132 {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},
133 {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},
134 {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},
135 {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},
136 {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},
137 {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},
138 {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},
139 {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},
140 {HB_TAG ('r','l','i','g'), HB_AAT_LAYOUT_FEATURE_TYPE_LIGATURES, HB_AAT_LAYOUT_FEATURE_SELECTOR_REQUIRED_LIGATURES_ON, HB_AAT_LAYOUT_FEATURE_SELECTOR_REQUIRED_LIGATURES_OFF},
141 {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},
142 {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},
143 {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},
144 {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},
145 {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},
146 {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},
147 {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},
148 {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},
149 {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},
150 {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},
151 {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},
152 {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},
153 {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},
154 {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},
155 {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},
156 {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},
157 {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},
158 {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},
159 {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},
160 {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},
161 {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},
162 {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},
163 {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},
164 {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},
165 {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},
166 {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},
167 {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},
168 {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},
169 {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},
170 {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},
171 {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},
172 {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},
173 {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},
174 {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},
175 {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},
176 {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},
177 {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},
178 {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},
179 {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},
180 {HB_TAG ('v','r','t','r'), HB_AAT_LAYOUT_FEATURE_TYPE_VERTICAL_SUBSTITUTION, (hb_aat_layout_feature_selector_t) 2, (hb_aat_layout_feature_selector_t) 3},
181 {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},
182 };
183
184 /**
185 * hb_aat_layout_find_feature_mapping:
186 * @tag: The requested #hb_tag_t feature tag
187 *
188 * Fetches the AAT feature-and-selector combination that corresponds
189 * to a given OpenType feature tag.
190 *
191 * Return value: the AAT features and selectors corresponding to the
192 * OpenType feature tag queried
193 *
194 **/
195 const hb_aat_feature_mapping_t *
hb_aat_layout_find_feature_mapping(hb_tag_t tag)196 hb_aat_layout_find_feature_mapping (hb_tag_t tag)
197 {
198 return hb_sorted_array (feature_mappings).bsearch (tag);
199 }
200 #endif
201
202
203 #ifndef HB_NO_AAT
204
205 /*
206 * mort/morx/kerx/trak
207 */
208
209
210 void
hb_aat_layout_compile_map(const hb_aat_map_builder_t * mapper,hb_aat_map_t * map)211 hb_aat_layout_compile_map (const hb_aat_map_builder_t *mapper,
212 hb_aat_map_t *map)
213 {
214 const AAT::morx& morx = *mapper->face->table.morx;
215 if (morx.has_data ())
216 {
217 morx.compile_flags (mapper, map);
218 return;
219 }
220
221 const AAT::mort& mort = *mapper->face->table.mort;
222 if (mort.has_data ())
223 {
224 mort.compile_flags (mapper, map);
225 return;
226 }
227 }
228
229
230 /**
231 * hb_aat_layout_has_substitution:
232 * @face: #hb_face_t to work upon
233 *
234 * Tests whether the specified face includes any substitutions in the
235 * `morx` or `mort` tables.
236 *
237 * <note>Note: does not examine the `GSUB` table.</note>
238 *
239 * Return value: `true` if data found, `false` otherwise
240 *
241 * Since: 2.3.0
242 */
243 hb_bool_t
hb_aat_layout_has_substitution(hb_face_t * face)244 hb_aat_layout_has_substitution (hb_face_t *face)
245 {
246 return face->table.morx->has_data () ||
247 face->table.mort->has_data ();
248 }
249
250 void
hb_aat_layout_substitute(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer,const hb_feature_t * features,unsigned num_features)251 hb_aat_layout_substitute (const hb_ot_shape_plan_t *plan,
252 hb_font_t *font,
253 hb_buffer_t *buffer,
254 const hb_feature_t *features,
255 unsigned num_features)
256 {
257 hb_aat_map_builder_t builder (font->face, plan->props);
258 for (unsigned i = 0; i < num_features; i++)
259 builder.add_feature (features[i]);
260 hb_aat_map_t map;
261 builder.compile (map);
262
263 hb_blob_t *morx_blob = font->face->table.morx.get_blob ();
264 const AAT::morx& morx = *morx_blob->as<AAT::morx> ();
265 if (morx.has_data ())
266 {
267 AAT::hb_aat_apply_context_t c (plan, font, buffer, morx_blob);
268 if (!buffer->message (font, "start table morx")) return;
269 morx.apply (&c, map);
270 (void) buffer->message (font, "end table morx");
271 return;
272 }
273
274 hb_blob_t *mort_blob = font->face->table.mort.get_blob ();
275 const AAT::mort& mort = *mort_blob->as<AAT::mort> ();
276 if (mort.has_data ())
277 {
278 AAT::hb_aat_apply_context_t c (plan, font, buffer, mort_blob);
279 if (!buffer->message (font, "start table mort")) return;
280 mort.apply (&c, map);
281 (void) buffer->message (font, "end table mort");
282 return;
283 }
284 }
285
286 void
hb_aat_layout_zero_width_deleted_glyphs(hb_buffer_t * buffer)287 hb_aat_layout_zero_width_deleted_glyphs (hb_buffer_t *buffer)
288 {
289 unsigned int count = buffer->len;
290 hb_glyph_info_t *info = buffer->info;
291 hb_glyph_position_t *pos = buffer->pos;
292 for (unsigned int i = 0; i < count; i++)
293 if (unlikely (info[i].codepoint == AAT::DELETED_GLYPH))
294 pos[i].x_advance = pos[i].y_advance = pos[i].x_offset = pos[i].y_offset = 0;
295 }
296
297 static bool
is_deleted_glyph(const hb_glyph_info_t * info)298 is_deleted_glyph (const hb_glyph_info_t *info)
299 {
300 return info->codepoint == AAT::DELETED_GLYPH;
301 }
302
303 void
hb_aat_layout_remove_deleted_glyphs(hb_buffer_t * buffer)304 hb_aat_layout_remove_deleted_glyphs (hb_buffer_t *buffer)
305 {
306 buffer->delete_glyphs_inplace (is_deleted_glyph);
307 }
308
309 /**
310 * hb_aat_layout_has_positioning:
311 * @face: #hb_face_t to work upon
312 *
313 * Tests whether the specified face includes any positioning information
314 * in the `kerx` table.
315 *
316 * <note>Note: does not examine the `GPOS` table.</note>
317 *
318 * Return value: `true` if data found, `false` otherwise
319 *
320 * Since: 2.3.0
321 */
322 hb_bool_t
hb_aat_layout_has_positioning(hb_face_t * face)323 hb_aat_layout_has_positioning (hb_face_t *face)
324 {
325 return face->table.kerx->has_data ();
326 }
327
328 void
hb_aat_layout_position(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer)329 hb_aat_layout_position (const hb_ot_shape_plan_t *plan,
330 hb_font_t *font,
331 hb_buffer_t *buffer)
332 {
333 hb_blob_t *kerx_blob = font->face->table.kerx.get_blob ();
334 const AAT::kerx& kerx = *kerx_blob->as<AAT::kerx> ();
335
336 AAT::hb_aat_apply_context_t c (plan, font, buffer, kerx_blob);
337 if (!buffer->message (font, "start table kerx")) return;
338 c.set_ankr_table (font->face->table.ankr.get ());
339 kerx.apply (&c);
340 (void) buffer->message (font, "end table kerx");
341 }
342
343
344 /**
345 * hb_aat_layout_has_tracking:
346 * @face:: #hb_face_t to work upon
347 *
348 * Tests whether the specified face includes any tracking information
349 * in the `trak` table.
350 *
351 * Return value: `true` if data found, `false` otherwise
352 *
353 * Since: 2.3.0
354 */
355 hb_bool_t
hb_aat_layout_has_tracking(hb_face_t * face)356 hb_aat_layout_has_tracking (hb_face_t *face)
357 {
358 return face->table.trak->has_data ();
359 }
360
361 void
hb_aat_layout_track(const hb_ot_shape_plan_t * plan,hb_font_t * font,hb_buffer_t * buffer)362 hb_aat_layout_track (const hb_ot_shape_plan_t *plan,
363 hb_font_t *font,
364 hb_buffer_t *buffer)
365 {
366 const AAT::trak& trak = *font->face->table.trak;
367
368 AAT::hb_aat_apply_context_t c (plan, font, buffer);
369 trak.apply (&c);
370 }
371
372 /**
373 * hb_aat_layout_get_feature_types:
374 * @face: #hb_face_t to work upon
375 * @start_offset: offset of the first feature type to retrieve
376 * @feature_count: (inout) (optional): Input = the maximum number of feature types to return;
377 * Output = the actual number of feature types returned (may be zero)
378 * @features: (out caller-allocates) (array length=feature_count): Array of feature types found
379 *
380 * Fetches a list of the AAT feature types included in the specified face.
381 *
382 * Return value: Number of all available feature types.
383 *
384 * Since: 2.2.0
385 */
386 unsigned int
hb_aat_layout_get_feature_types(hb_face_t * face,unsigned int start_offset,unsigned int * feature_count,hb_aat_layout_feature_type_t * features)387 hb_aat_layout_get_feature_types (hb_face_t *face,
388 unsigned int start_offset,
389 unsigned int *feature_count, /* IN/OUT. May be NULL. */
390 hb_aat_layout_feature_type_t *features /* OUT. May be NULL. */)
391 {
392 return face->table.feat->get_feature_types (start_offset, feature_count, features);
393 }
394
395 /**
396 * hb_aat_layout_feature_type_get_name_id:
397 * @face: #hb_face_t to work upon
398 * @feature_type: The #hb_aat_layout_feature_type_t of the requested feature type
399 *
400 * Fetches the name identifier of the specified feature type in the face's `name` table.
401 *
402 * Return value: Name identifier of the requested feature type
403 *
404 * Since: 2.2.0
405 */
406 hb_ot_name_id_t
hb_aat_layout_feature_type_get_name_id(hb_face_t * face,hb_aat_layout_feature_type_t feature_type)407 hb_aat_layout_feature_type_get_name_id (hb_face_t *face,
408 hb_aat_layout_feature_type_t feature_type)
409 {
410 return face->table.feat->get_feature_name_id (feature_type);
411 }
412
413 /**
414 * hb_aat_layout_feature_type_get_selector_infos:
415 * @face: #hb_face_t to work upon
416 * @feature_type: The #hb_aat_layout_feature_type_t of the requested feature type
417 * @start_offset: offset of the first feature type to retrieve
418 * @selector_count: (inout) (optional): Input = the maximum number of selectors to return;
419 * Output = the actual number of selectors returned (may be zero)
420 * @selectors: (out caller-allocates) (array length=selector_count) (optional):
421 * A buffer pointer. The selectors available for the feature type queries.
422 * @default_index: (out) (optional): The index of the feature's default selector, if any
423 *
424 * Fetches a list of the selectors available for the specified feature in the given face.
425 *
426 * If upon return, @default_index is set to #HB_AAT_LAYOUT_NO_SELECTOR_INDEX, then
427 * the feature type is non-exclusive. Otherwise, @default_index is the index of
428 * the selector that is selected by default.
429 *
430 * Return value: Number of all available feature selectors
431 *
432 * Since: 2.2.0
433 */
434 unsigned int
hb_aat_layout_feature_type_get_selector_infos(hb_face_t * face,hb_aat_layout_feature_type_t feature_type,unsigned int start_offset,unsigned int * selector_count,hb_aat_layout_feature_selector_info_t * selectors,unsigned int * default_index)435 hb_aat_layout_feature_type_get_selector_infos (hb_face_t *face,
436 hb_aat_layout_feature_type_t feature_type,
437 unsigned int start_offset,
438 unsigned int *selector_count, /* IN/OUT. May be NULL. */
439 hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
440 unsigned int *default_index /* OUT. May be NULL. */)
441 {
442 return face->table.feat->get_selector_infos (feature_type, start_offset, selector_count, selectors, default_index);
443 }
444
445
446 #endif
447