/* * Copyright © 2009,2010 Red Hat, Inc. * Copyright © 2010,2011,2012 Google, Inc. * * This is part of HarfBuzz, a text shaping library. * * Permission is hereby granted, without written agreement and without * license or royalty fees, to use, copy, modify, and distribute this * software and its documentation for any purpose, provided that the * above copyright notice and the following two paragraphs appear in * all copies of this software. * * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. * * Red Hat Author(s): Behdad Esfahbod * Google Author(s): Behdad Esfahbod */ #ifndef HB_OT_MAP_PRIVATE_HH #define HB_OT_MAP_PRIVATE_HH #include "hb-buffer-private.hh" #include "hb-ot-layout-private.hh" static const hb_tag_t table_tags[2] = {HB_OT_TAG_GSUB, HB_OT_TAG_GPOS}; struct hb_ot_map_t { friend struct hb_ot_map_builder_t; public: struct feature_map_t { hb_tag_t tag; /* should be first for our bsearch to work */ unsigned int index[2]; /* GSUB/GPOS */ unsigned int stage[2]; /* GSUB/GPOS */ unsigned int shift; hb_mask_t mask; hb_mask_t _1_mask; /* mask for value=1, for quick access */ static int cmp (const feature_map_t *a, const feature_map_t *b) { return a->tag < b->tag ? -1 : a->tag > b->tag ? 1 : 0; } }; struct lookup_map_t { unsigned int index; hb_mask_t mask; static int cmp (const lookup_map_t *a, const lookup_map_t *b) { return a->index < b->index ? -1 : a->index > b->index ? 1 : 0; } }; typedef void (*pause_func_t) (const hb_ot_map_t *map, void *face_or_font, hb_buffer_t *buffer, void *user_data); typedef struct { pause_func_t func; void *user_data; } pause_callback_t; struct pause_map_t { unsigned int num_lookups; /* Cumulative */ pause_callback_t callback; }; hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); } typedef void (*gsub_pause_func_t) (const hb_ot_map_t *map, hb_face_t *face, hb_buffer_t *buffer, void *user_data); typedef void (*gpos_pause_func_t) (const hb_ot_map_t *map, hb_font_t *font, hb_buffer_t *buffer, void *user_data); inline hb_mask_t get_global_mask (void) const { return global_mask; } inline hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = NULL) const { const feature_map_t *map = features.bsearch (&feature_tag); if (shift) *shift = map ? map->shift : 0; return map ? map->mask : 0; } inline hb_mask_t get_1_mask (hb_tag_t feature_tag) const { const feature_map_t *map = features.bsearch (&feature_tag); return map ? map->_1_mask : 0; } inline unsigned int get_feature_index (unsigned int table_index, hb_tag_t feature_tag) const { const feature_map_t *map = features.bsearch (&feature_tag); return map ? map->index[table_index] : HB_OT_LAYOUT_NO_FEATURE_INDEX; } inline unsigned int get_feature_stage (unsigned int table_index, hb_tag_t feature_tag) const { const feature_map_t *map = features.bsearch (&feature_tag); return map ? map->stage[table_index] : (unsigned int) -1; } inline void get_stage_lookups (unsigned int table_index, unsigned int stage, const struct lookup_map_t **plookups, unsigned int *lookup_count) const { if (unlikely (stage == (unsigned int) -1)) { *plookups = NULL; *lookup_count = 0; return; } assert (stage <= pauses[table_index].len); unsigned int start = stage ? pauses[table_index][stage - 1].num_lookups : 0; unsigned int end = stage < pauses[table_index].len ? pauses[table_index][stage].num_lookups : lookups[table_index].len; *plookups = &lookups[table_index][start]; *lookup_count = end - start; } inline hb_tag_t get_chosen_script (unsigned int table_index) const { return chosen_script[table_index]; } HB_INTERNAL void substitute_closure (hb_face_t *face, hb_set_t *glyphs) const; HB_INTERNAL void substitute (hb_face_t *face, hb_buffer_t *buffer) const; HB_INTERNAL void position (hb_font_t *font, hb_buffer_t *buffer) const; inline void finish (void) { features.finish (); lookups[0].finish (); lookups[1].finish (); pauses[0].finish (); pauses[1].finish (); } private: HB_INTERNAL void add_lookups (hb_face_t *face, unsigned int table_index, unsigned int feature_index, hb_mask_t mask); hb_mask_t global_mask; hb_tag_t chosen_script[2]; hb_prealloced_array_t features; hb_prealloced_array_t lookups[2]; /* GSUB/GPOS */ hb_prealloced_array_t pauses[2]; /* GSUB/GPOS */ }; struct hb_ot_map_builder_t { public: hb_ot_map_builder_t (void) { memset (this, 0, sizeof (*this)); } HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, bool global); inline void add_bool_feature (hb_tag_t tag, bool global = true) { add_feature (tag, 1, global); } inline void add_gsub_pause (hb_ot_map_t::gsub_pause_func_t pause_func, void *user_data) { add_pause (0, (hb_ot_map_t::pause_func_t) pause_func, user_data); } inline void add_gpos_pause (hb_ot_map_t::gpos_pause_func_t pause_func, void *user_data) { add_pause (1, (hb_ot_map_t::pause_func_t) pause_func, user_data); } HB_INTERNAL void compile (hb_face_t *face, const hb_segment_properties_t *props, struct hb_ot_map_t &m); inline void finish (void) { feature_infos.finish (); pauses[0].finish (); pauses[1].finish (); } private: struct feature_info_t { hb_tag_t tag; unsigned int seq; /* sequence#, used for stable sorting only */ unsigned int max_value; bool global; /* whether the feature applies value to every glyph in the buffer */ unsigned int default_value; /* for non-global features, what should the unset glyphs take */ unsigned int stage[2]; /* GSUB/GPOS */ static int cmp (const feature_info_t *a, const feature_info_t *b) { return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : (a->seq < b->seq ? -1 : 1); } }; struct pause_info_t { unsigned int stage; hb_ot_map_t::pause_callback_t callback; }; HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func, void *user_data); unsigned int current_stage[2]; /* GSUB/GPOS */ hb_prealloced_array_t feature_infos; hb_prealloced_array_t pauses[2]; /* GSUB/GPOS */ }; #endif /* HB_OT_MAP_PRIVATE_HH */