2 * Copyright (C) 2009,2010 Red Hat, Inc.
3 * Copyright (C) 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 #define MAX_FEATURES 100 /* FIXME */
40 #define MAX_LOOKUPS 1000 /* FIXME */
42 static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
48 struct feature_info_t {
50 unsigned int seq; /* sequence#, used for stable sorting only */
51 unsigned int max_value;
52 bool global; /* whether the feature applies value to every glyph in the buffer */
53 unsigned int default_value; /* for non-global features, what should the unset glyphs take */
55 static int cmp (const feature_info_t *a, const feature_info_t *b)
56 { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
59 struct feature_map_t {
60 hb_tag_t tag; /* should be first for our bsearch to work */
61 unsigned int index[2]; /* GSUB, GPOS */
65 static int cmp (const feature_map_t *a, const feature_map_t *b)
66 { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
73 static int cmp (const lookup_map_t *a, const lookup_map_t *b)
74 { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
77 HB_INTERNAL void add_lookups (hb_face_t *face,
78 unsigned int table_index,
79 unsigned int feature_index,
85 hb_ot_map_t (void) : feature_count (0) {}
87 void add_feature (hb_tag_t tag, unsigned int value, bool global)
89 feature_info_t *info = &feature_infos[feature_count++];
91 info->seq = feature_count;
92 info->max_value = value;
93 info->global = global;
94 info->default_value = global ? value : 0;
97 inline void add_bool_feature (hb_tag_t tag, bool global = true)
98 { add_feature (tag, 1, global); }
100 HB_INTERNAL void compile (hb_face_t *face,
101 const hb_segment_properties_t *props);
103 hb_mask_t get_global_mask (void) const { return global_mask; }
105 hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const {
106 const feature_map_t *map = (const feature_map_t *) bsearch (&tag, feature_maps, feature_count, sizeof (feature_maps[0]), (hb_compare_func_t) feature_map_t::cmp);
107 if (shift) *shift = map ? map->shift : 0;
108 return map ? map->mask : 0;
111 inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const {
112 for (unsigned int i = 0; i < lookup_count[0]; i++)
113 hb_ot_layout_substitute_lookup (face, buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
116 inline void position (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer) const {
117 for (unsigned int i = 0; i < lookup_count[1]; i++)
118 hb_ot_layout_position_lookup (font, face, buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
123 hb_mask_t global_mask;
125 unsigned int feature_count;
126 feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */
127 feature_map_t feature_maps[MAX_FEATURES];
129 lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */
130 unsigned int lookup_count[2];
137 #endif /* HB_OT_MAP_PRIVATE_HH */