136 lines
4.1 KiB
C++
136 lines
4.1 KiB
C++
/*
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* Copyright (C) 2009,2010 Red Hat, Inc.
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* Copyright (C) 2010 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Red Hat Author(s): Behdad Esfahbod
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_MAP_PRIVATE_HH
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#define HB_OT_MAP_PRIVATE_HH
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#include "hb-buffer-private.hh"
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#include "hb-ot-layout.h"
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HB_BEGIN_DECLS
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#define MAX_FEATURES 100 /* FIXME */
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#define MAX_LOOKUPS 1000 /* FIXME */
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static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS};
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struct hb_ot_map_t {
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private:
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struct feature_info_t {
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hb_tag_t tag;
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unsigned int value;
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unsigned int seq;
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bool global;
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static int cmp (const feature_info_t *a, const feature_info_t *b)
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{ return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); }
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};
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struct feature_map_t {
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hb_tag_t tag; /* should be first for our bsearch to work */
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unsigned int index[2]; /* GSUB, GPOS */
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unsigned int shift;
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hb_mask_t mask;
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static int cmp (const feature_map_t *a, const feature_map_t *b)
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{ return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; }
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};
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struct lookup_map_t {
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unsigned int index;
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hb_mask_t mask;
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static int cmp (const lookup_map_t *a, const lookup_map_t *b)
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{ return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; }
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};
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HB_INTERNAL void add_lookups (hb_face_t *face,
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unsigned int table_index,
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unsigned int feature_index,
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hb_mask_t mask);
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public:
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hb_ot_map_t (void) : feature_count (0) {}
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void add_feature (hb_tag_t tag, unsigned int value, bool global)
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{
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feature_info_t *info = &feature_infos[feature_count++];
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info->tag = tag;
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info->value = value;
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info->seq = feature_count;
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info->global = global;
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}
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inline void add_bool_feature (hb_tag_t tag, bool global = true)
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{ add_feature (tag, 1, global); }
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HB_INTERNAL void compile (hb_face_t *face,
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const hb_segment_properties_t *props);
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hb_mask_t get_global_mask (void) const { return global_mask; }
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hb_mask_t get_mask (hb_tag_t tag, unsigned int *shift = NULL) const {
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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);
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if (shift) *shift = map ? map->shift : 0;
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return map ? map->mask : 0;
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}
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inline void substitute (hb_face_t *face, hb_buffer_t *buffer) const {
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for (unsigned int i = 0; i < lookup_count[0]; i++)
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hb_ot_layout_substitute_lookup (face, buffer, lookup_maps[0][i].index, lookup_maps[0][i].mask);
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}
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inline void position (hb_font_t *font, hb_face_t *face, hb_buffer_t *buffer) const {
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for (unsigned int i = 0; i < lookup_count[1]; i++)
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hb_ot_layout_position_lookup (font, face, buffer, lookup_maps[1][i].index, lookup_maps[1][i].mask);
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}
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private:
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hb_mask_t global_mask;
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unsigned int feature_count;
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feature_info_t feature_infos[MAX_FEATURES]; /* used before compile() only */
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feature_map_t feature_maps[MAX_FEATURES];
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lookup_map_t lookup_maps[2][MAX_LOOKUPS]; /* GSUB/GPOS */
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unsigned int lookup_count[2];
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};
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HB_END_DECLS
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#endif /* HB_OT_MAP_PRIVATE_HH */
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