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Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-map.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-map.hh | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-map.hh b/thirdparty/harfbuzz/src/hb-ot-map.hh new file mode 100644 index 0000000000..7629a869bd --- /dev/null +++ b/thirdparty/harfbuzz/src/hb-ot-map.hh @@ -0,0 +1,284 @@ +/* + * 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_HH +#define HB_OT_MAP_HH + +#include "hb-buffer.hh" + + +#define HB_OT_MAP_MAX_BITS 8u +#define HB_OT_MAP_MAX_VALUE ((1u << HB_OT_MAP_MAX_BITS) - 1u) + +struct hb_ot_shape_plan_t; + +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_zwnj : 1; + unsigned int auto_zwj : 1; + unsigned int random : 1; + + int cmp (const hb_tag_t tag_) const + { return tag_ < tag ? -1 : tag_ > tag ? 1 : 0; } + }; + + struct lookup_map_t { + unsigned short index; + unsigned short auto_zwnj : 1; + unsigned short auto_zwj : 1; + unsigned short random : 1; + hb_mask_t mask; + + HB_INTERNAL static int cmp (const void *pa, const void *pb) + { + const lookup_map_t *a = (const lookup_map_t *) pa; + const lookup_map_t *b = (const lookup_map_t *) pb; + 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 stage_map_t { + unsigned int last_lookup; /* Cumulative */ + pause_func_t pause_func; + }; + + void init () + { + memset (this, 0, sizeof (*this)); + + features.init (); + for (unsigned int table_index = 0; table_index < 2; table_index++) + { + lookups[table_index].init (); + stages[table_index].init (); + } + } + void fini () + { + features.fini (); + for (unsigned int table_index = 0; table_index < 2; table_index++) + { + lookups[table_index].fini (); + stages[table_index].fini (); + } + } + + hb_mask_t get_global_mask () const { return global_mask; } + + hb_mask_t get_mask (hb_tag_t feature_tag, unsigned int *shift = nullptr) const + { + const feature_map_t *map = features.bsearch (feature_tag); + if (shift) *shift = map ? map->shift : 0; + return map ? map->mask : 0; + } + + bool needs_fallback (hb_tag_t feature_tag) const + { + const feature_map_t *map = features.bsearch (feature_tag); + return map ? map->needs_fallback : false; + } + + 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; + } + + 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; + } + + 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] : UINT_MAX; + } + + 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 == UINT_MAX)) { + *plookups = nullptr; + *lookup_count = 0; + return; + } + assert (stage <= stages[table_index].length); + unsigned int start = stage ? stages[table_index][stage - 1].last_lookup : 0; + unsigned int end = stage < stages[table_index].length ? stages[table_index][stage].last_lookup : lookups[table_index].length; + *plookups = end == start ? nullptr : &lookups[table_index][start]; + *lookup_count = end - start; + } + + HB_INTERNAL void collect_lookups (unsigned int table_index, hb_set_t *lookups) const; + template <typename Proxy> + HB_INTERNAL void apply (const Proxy &proxy, + const struct hb_ot_shape_plan_t *plan, hb_font_t *font, hb_buffer_t *buffer) 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; + + public: + hb_tag_t chosen_script[2]; + bool found_script[2]; + + private: + + hb_mask_t global_mask; + + hb_sorted_vector_t<feature_map_t> features; + hb_vector_t<lookup_map_t> lookups[2]; /* GSUB/GPOS */ + hb_vector_t<stage_map_t> stages[2]; /* GSUB/GPOS */ +}; + +enum hb_ot_map_feature_flags_t +{ + F_NONE = 0x0000u, + F_GLOBAL = 0x0001u, /* Feature applies to all characters; results in no mask allocated for it. */ + F_HAS_FALLBACK = 0x0002u, /* Has fallback implementation, so include mask bit even if feature not found. */ + F_MANUAL_ZWNJ = 0x0004u, /* Don't skip over ZWNJ when matching **context**. */ + F_MANUAL_ZWJ = 0x0008u, /* Don't skip over ZWJ when matching **input**. */ + F_MANUAL_JOINERS = F_MANUAL_ZWNJ | F_MANUAL_ZWJ, + F_GLOBAL_MANUAL_JOINERS= F_GLOBAL | F_MANUAL_JOINERS, + F_GLOBAL_HAS_FALLBACK = F_GLOBAL | F_HAS_FALLBACK, + F_GLOBAL_SEARCH = 0x0010u, /* If feature not found in LangSys, look for it in global feature list and pick one. */ + F_RANDOM = 0x0020u /* Randomly select a glyph from an AlternateSubstFormat1 subtable. */ +}; +HB_MARK_AS_FLAG_T (hb_ot_map_feature_flags_t); + + +struct hb_ot_map_feature_t +{ + hb_tag_t tag; + hb_ot_map_feature_flags_t flags; +}; + +struct hb_ot_shape_plan_key_t; + +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 ~hb_ot_map_builder_t (); + + HB_INTERNAL void add_feature (hb_tag_t tag, + hb_ot_map_feature_flags_t flags=F_NONE, + unsigned int value=1); + + void add_feature (const hb_ot_map_feature_t &feat) + { add_feature (feat.tag, feat.flags); } + + void enable_feature (hb_tag_t tag, + hb_ot_map_feature_flags_t flags=F_NONE, + unsigned int value=1) + { add_feature (tag, F_GLOBAL | flags, value); } + + void disable_feature (hb_tag_t tag) + { add_feature (tag, F_GLOBAL, 0); } + + void add_gsub_pause (hb_ot_map_t::pause_func_t pause_func) + { add_pause (0, pause_func); } + void add_gpos_pause (hb_ot_map_t::pause_func_t pause_func) + { add_pause (1, pause_func); } + + HB_INTERNAL void compile (hb_ot_map_t &m, + const hb_ot_shape_plan_key_t &key); + + private: + + HB_INTERNAL void add_lookups (hb_ot_map_t &m, + unsigned int table_index, + unsigned int feature_index, + unsigned int variations_index, + hb_mask_t mask, + bool auto_zwnj = true, + bool auto_zwj = true, + bool random = false); + + 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 */ + + HB_INTERNAL static int cmp (const void *pa, const void *pb) + { + const feature_info_t *a = (const feature_info_t *) pa; + const feature_info_t *b = (const feature_info_t *) pb; + return (a->tag != b->tag) ? (a->tag < b->tag ? -1 : 1) : + (a->seq < b->seq ? -1 : a->seq > b->seq ? 1 : 0); + } + }; + + struct stage_info_t { + unsigned int index; + hb_ot_map_t::pause_func_t pause_func; + }; + + 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_vector_t<feature_info_t> feature_infos; + hb_vector_t<stage_info_t> stages[2]; /* GSUB/GPOS */ +}; + + + +#endif /* HB_OT_MAP_HH */ |