/* * Copyright © 2009,2010 Red Hat, Inc. * Copyright © 2010,2011,2012,2013 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 */ unsigned int needs_fallback : 1; unsigned int auto_zwj : 1; 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 short index; unsigned short auto_zwj : 1; 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 struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer); struct pause_map_t { unsigned int num_lookups; /* Cumulative */ pause_func_t callback; }; hb_ot_map_t (void) { memset (this, 0, sizeof (*this)); } 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 bool needs_fallback (hb_tag_t feature_tag) const { const feature_map_t *map = features.bsearch (&feature_tag); return map ? map->needs_fallback : false; } 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; } HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const; HB_INTERNAL void substitute (const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) const; HB_INTERNAL void position (const struct hb_ot_shape_plan_t *plan, 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 (); } public: hb_tag_t chosen_script[2]; bool found_script[2]; private: HB_INTERNAL void add_lookups (hb_face_t *face, unsigned int table_index, unsigned int feature_index, hb_mask_t mask, bool auto_zwj); hb_mask_t global_mask; hb_prealloced_array_t features; hb_prealloced_array_t lookups[2]; /* GSUB/GPOS */ hb_prealloced_array_t pauses[2]; /* GSUB/GPOS */ }; enum hb_ot_map_feature_flags_t { F_NONE = 0x0000, F_GLOBAL = 0x0001, F_HAS_FALLBACK = 0x0002, F_MANUAL_ZWJ = 0x0004 }; /* Macro version for where const is desired. */ #define F_COMBINE(l,r) (hb_ot_map_feature_flags_t ((unsigned int) (l) | (unsigned int) (r))) inline hb_ot_map_feature_flags_t operator | (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r) { return hb_ot_map_feature_flags_t ((unsigned int) l | (unsigned int) r); } inline hb_ot_map_feature_flags_t operator & (hb_ot_map_feature_flags_t l, hb_ot_map_feature_flags_t r) { return hb_ot_map_feature_flags_t ((unsigned int) l & (unsigned int) r); } inline hb_ot_map_feature_flags_t operator ~ (hb_ot_map_feature_flags_t r) { return hb_ot_map_feature_flags_t (~(unsigned int) r); } inline hb_ot_map_feature_flags_t& operator |= (hb_ot_map_feature_flags_t &l, hb_ot_map_feature_flags_t r) { l = l | r; return l; } inline hb_ot_map_feature_flags_t& operator &= (hb_ot_map_feature_flags_t& l, hb_ot_map_feature_flags_t r) { l = l & r; return l; } struct hb_ot_map_builder_t { public: HB_INTERNAL hb_ot_map_builder_t (hb_face_t *face_, const hb_segment_properties_t *props_); HB_INTERNAL void add_feature (hb_tag_t tag, unsigned int value, hb_ot_map_feature_flags_t flags); inline void add_global_bool_feature (hb_tag_t tag) { add_feature (tag, 1, F_GLOBAL); } inline void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func) { add_pause (0, pause_func); } inline void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func) { add_pause (1, pause_func); } HB_INTERNAL void compile (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; hb_ot_map_feature_flags_t flags; 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_func_t callback; }; HB_INTERNAL void add_pause (unsigned int table_index, hb_ot_map_t::pause_func_t pause_func); public: hb_face_t *face; hb_segment_properties_t props; hb_tag_t chosen_script[2]; bool found_script[2]; unsigned int script_index[2], language_index[2]; private: 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 */