2 * Copyright © 2009,2010 Red Hat, Inc.
3 * Copyright © 2010 Google, Inc.
5 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
25 * Red Hat Author(s): Behdad Esfahbod
26 * Google Author(s): Behdad Esfahbod
29 #ifndef HB_OT_MAP_PRIVATE_HH
30 #define HB_OT_MAP_PRIVATE_HH
32 #include "hb-buffer-private.hh"
34 #include "hb-ot-layout.h"
39 static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
43 friend struct hb_ot_map_builder_t;
47 typedef void (*gsub_pause_func_t) (const hb_ot_map_t *map, hb_face_t *face, hb_buffer_t *buffer, void *user_data);
48 typedef void (*gpos_pause_func_t) (const hb_ot_map_t *map, hb_font_t *font, hb_buffer_t *buffer, void *user_data);
50 inline hb_mask_t get_global_mask (void) const { return global_mask; }
52 inline hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const {
53 const feature_map_t *map = features.bsearch (&tag);
54 if (shift) *shift = map ? map->shift : 0;
55 return map ? map->mask : 0;
58 inline hb_mask_t get_1_mask (hb_tag_t tag) const {
59 const feature_map_t *map = features.bsearch (&tag);
60 return map ? map->_1_mask : 0;
63 HB_INTERNAL void substitute (hb_face_t *face, hb_buffer_t *buffer) const;
64 HB_INTERNAL void position (hb_font_t *font, hb_buffer_t *buffer) const;
66 inline void finish (void) {
76 struct feature_map_t {
77 hb_tag_t tag; /* should be first for our bsearch to work */
78 unsigned int index[2]; /* GSUB/GPOS */
79 unsigned int stage[2]; /* GSUB/GPOS */
82 hb_mask_t _1_mask; /* mask for value=1, for quick access */
84 static int cmp (const feature_map_t *a, const feature_map_t *b)
85 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
92 static int cmp (const lookup_map_t *a, const lookup_map_t *b)
93 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
98 gsub_pause_func_t gsub;
99 gpos_pause_func_t gpos;
107 unsigned int num_lookups; /* Cumulative */
108 pause_callback_t callback;
111 HB_INTERNAL void add_lookups (hb_face_t *face,
112 unsigned int table_index,
113 unsigned int feature_index,
117 hb_mask_t global_mask;
119 hb_prealloced_array_t<feature_map_t, 8> features;
120 hb_prealloced_array_t<lookup_map_t, 32> lookups[2]; /* GSUB/GPOS */
121 hb_prealloced_array_t<pause_map_t, 1> pauses[2]; /* GSUB/GPOS */
125 struct hb_ot_map_builder_t
129 HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, bool global);
131 inline void add_bool_feature (hb_tag_t tag, bool global = true)
132 { add_feature (tag, 1, global); }
134 HB_INTERNAL void add_gsub_pause (hb_ot_map_t::gsub_pause_func_t pause_func, void *user_data);
135 HB_INTERNAL void add_gpos_pause (hb_ot_map_t::gpos_pause_func_t pause_func, void *user_data);
137 HB_INTERNAL void compile (hb_face_t *face,
138 const hb_segment_properties_t *props,
139 struct hb_ot_map_t &m);
141 inline void finish (void) {
142 feature_infos.finish ();
149 struct feature_info_t {
151 unsigned int seq; /* sequence#, used for stable sorting only */
152 unsigned int max_value;
153 bool global; /* whether the feature applies value to every glyph in the buffer */
154 unsigned int default_value; /* for non-global features, what should the unset glyphs take */
155 unsigned int stage[2]; /* GSUB/GPOS */
157 static int cmp (const feature_info_t *a, const feature_info_t *b)
158 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
161 struct pause_info_t {
163 hb_ot_map_t::pause_callback_t callback;
166 unsigned int current_stage[2]; /* GSUB/GPOS */
167 hb_prealloced_array_t<feature_info_t,16> feature_infos;
168 hb_prealloced_array_t<pause_info_t, 1> pauses[2]; /* GSUB/GPOS */
174 #endif /* HB_OT_MAP_PRIVATE_HH */