diff options
Diffstat (limited to 'thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh')
| -rw-r--r-- | thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh | 488 |
1 files changed, 488 insertions, 0 deletions
diff --git a/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh b/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh new file mode 100644 index 0000000000..fdcc88d674 --- /dev/null +++ b/thirdparty/harfbuzz/src/hb-ot-var-hvar-table.hh @@ -0,0 +1,488 @@ +/* + * Copyright © 2017 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. + * + * Google Author(s): Behdad Esfahbod + */ + +#ifndef HB_OT_VAR_HVAR_TABLE_HH +#define HB_OT_VAR_HVAR_TABLE_HH + +#include "hb-ot-layout-common.hh" + + +namespace OT { + + +struct DeltaSetIndexMap +{ + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this) && + c->check_range (mapDataZ.arrayZ, + mapCount, + get_width ())); + } + + template <typename T> + bool serialize (hb_serialize_context_t *c, const T &plan) + { + unsigned int width = plan.get_width (); + unsigned int inner_bit_count = plan.get_inner_bit_count (); + const hb_array_t<const unsigned int> output_map = plan.get_output_map (); + + TRACE_SERIALIZE (this); + if (unlikely (output_map.length && ((((inner_bit_count-1)&~0xF)!=0) || (((width-1)&~0x3)!=0)))) + return_trace (false); + if (unlikely (!c->extend_min (*this))) return_trace (false); + + format = ((width-1)<<4)|(inner_bit_count-1); + mapCount = output_map.length; + HBUINT8 *p = c->allocate_size<HBUINT8> (width * output_map.length); + if (unlikely (!p)) return_trace (false); + for (unsigned int i = 0; i < output_map.length; i++) + { + unsigned int v = output_map[i]; + unsigned int outer = v >> 16; + unsigned int inner = v & 0xFFFF; + unsigned int u = (outer << inner_bit_count) | inner; + for (unsigned int w = width; w > 0;) + { + p[--w] = u; + u >>= 8; + } + p += width; + } + return_trace (true); + } + + unsigned int map (unsigned int v) const /* Returns 16.16 outer.inner. */ + { + /* If count is zero, pass value unchanged. This takes + * care of direct mapping for advance map. */ + if (!mapCount) + return v; + + if (v >= mapCount) + v = mapCount - 1; + + unsigned int u = 0; + { /* Fetch it. */ + unsigned int w = get_width (); + const HBUINT8 *p = mapDataZ.arrayZ + w * v; + for (; w; w--) + u = (u << 8) + *p++; + } + + { /* Repack it. */ + unsigned int n = get_inner_bit_count (); + unsigned int outer = u >> n; + unsigned int inner = u & ((1 << n) - 1); + u = (outer<<16) | inner; + } + + return u; + } + + unsigned int get_map_count () const { return mapCount; } + unsigned int get_width () const { return ((format >> 4) & 3) + 1; } + unsigned int get_inner_bit_count () const { return (format & 0xF) + 1; } + + protected: + HBUINT16 format; /* A packed field that describes the compressed + * representation of delta-set indices. */ + HBUINT16 mapCount; /* The number of mapping entries. */ + UnsizedArrayOf<HBUINT8> + mapDataZ; /* The delta-set index mapping data. */ + + public: + DEFINE_SIZE_ARRAY (4, mapDataZ); +}; + +struct index_map_subset_plan_t +{ + enum index_map_index_t { + ADV_INDEX, + LSB_INDEX, /* dual as TSB */ + RSB_INDEX, /* dual as BSB */ + VORG_INDEX + }; + + void init (const DeltaSetIndexMap &index_map, + hb_inc_bimap_t &outer_map, + hb_vector_t<hb_set_t *> &inner_sets, + const hb_subset_plan_t *plan) + { + map_count = 0; + outer_bit_count = 0; + inner_bit_count = 1; + max_inners.init (); + output_map.init (); + + if (&index_map == &Null (DeltaSetIndexMap)) return; + + unsigned int last_val = (unsigned int)-1; + hb_codepoint_t last_gid = (hb_codepoint_t)-1; + hb_codepoint_t gid = (hb_codepoint_t) hb_min (index_map.get_map_count (), plan->num_output_glyphs ()); + + outer_bit_count = (index_map.get_width () * 8) - index_map.get_inner_bit_count (); + max_inners.resize (inner_sets.length); + for (unsigned i = 0; i < inner_sets.length; i++) max_inners[i] = 0; + + /* Search backwards for a map value different from the last map value */ + for (; gid > 0; gid--) + { + hb_codepoint_t old_gid; + if (!plan->old_gid_for_new_gid (gid - 1, &old_gid)) + { + if (last_gid == (hb_codepoint_t) -1) + continue; + else + break; + } + + unsigned int v = index_map.map (old_gid); + if (last_gid == (hb_codepoint_t) -1) + { + last_val = v; + last_gid = gid; + continue; + } + if (v != last_val) break; + + last_gid = gid; + } + + if (unlikely (last_gid == (hb_codepoint_t)-1)) return; + map_count = last_gid; + for (gid = 0; gid < map_count; gid++) + { + hb_codepoint_t old_gid; + if (plan->old_gid_for_new_gid (gid, &old_gid)) + { + unsigned int v = index_map.map (old_gid); + unsigned int outer = v >> 16; + unsigned int inner = v & 0xFFFF; + outer_map.add (outer); + if (inner > max_inners[outer]) max_inners[outer] = inner; + if (outer >= inner_sets.length) return; + inner_sets[outer]->add (inner); + } + } + } + + void fini () + { + max_inners.fini (); + output_map.fini (); + } + + void remap (const DeltaSetIndexMap *input_map, + const hb_inc_bimap_t &outer_map, + const hb_vector_t<hb_inc_bimap_t> &inner_maps, + const hb_subset_plan_t *plan) + { + if (input_map == &Null (DeltaSetIndexMap)) return; + + for (unsigned int i = 0; i < max_inners.length; i++) + { + if (inner_maps[i].get_population () == 0) continue; + unsigned int bit_count = (max_inners[i]==0)? 1: hb_bit_storage (inner_maps[i][max_inners[i]]); + if (bit_count > inner_bit_count) inner_bit_count = bit_count; + } + + output_map.resize (map_count); + for (hb_codepoint_t gid = 0; gid < output_map.length; gid++) + { + hb_codepoint_t old_gid; + if (plan->old_gid_for_new_gid (gid, &old_gid)) + { + unsigned int v = input_map->map (old_gid); + unsigned int outer = v >> 16; + output_map[gid] = (outer_map[outer] << 16) | (inner_maps[outer][v & 0xFFFF]); + } + else + output_map[gid] = 0; /* Map unused glyph to outer/inner=0/0 */ + } + } + + unsigned int get_inner_bit_count () const { return inner_bit_count; } + unsigned int get_width () const { return ((outer_bit_count + inner_bit_count + 7) / 8); } + unsigned int get_map_count () const { return map_count; } + + unsigned int get_size () const + { return (map_count? (DeltaSetIndexMap::min_size + get_width () * map_count): 0); } + + bool is_identity () const { return get_output_map ().length == 0; } + hb_array_t<const unsigned int> get_output_map () const { return output_map.as_array (); } + + protected: + unsigned int map_count; + hb_vector_t<unsigned int> max_inners; + unsigned int outer_bit_count; + unsigned int inner_bit_count; + hb_vector_t<unsigned int> output_map; +}; + +struct hvarvvar_subset_plan_t +{ + hvarvvar_subset_plan_t() : inner_maps (), index_map_plans () {} + ~hvarvvar_subset_plan_t() { fini (); } + + void init (const hb_array_t<const DeltaSetIndexMap *> &index_maps, + const VariationStore &_var_store, + const hb_subset_plan_t *plan) + { + index_map_plans.resize (index_maps.length); + + var_store = &_var_store; + inner_sets.resize (var_store->get_sub_table_count ()); + for (unsigned int i = 0; i < inner_sets.length; i++) + inner_sets[i] = hb_set_create (); + adv_set = hb_set_create (); + + inner_maps.resize (var_store->get_sub_table_count ()); + + for (unsigned int i = 0; i < inner_maps.length; i++) + inner_maps[i].init (); + + if (unlikely (!index_map_plans.length || !inner_sets.length || !inner_maps.length)) return; + + bool retain_adv_map = false; + index_map_plans[0].init (*index_maps[0], outer_map, inner_sets, plan); + if (index_maps[0] == &Null (DeltaSetIndexMap)) + { + retain_adv_map = plan->retain_gids; + outer_map.add (0); + for (hb_codepoint_t gid = 0; gid < plan->num_output_glyphs (); gid++) + { + hb_codepoint_t old_gid; + if (plan->old_gid_for_new_gid (gid, &old_gid)) + inner_sets[0]->add (old_gid); + } + hb_set_union (adv_set, inner_sets[0]); + } + + for (unsigned int i = 1; i < index_maps.length; i++) + index_map_plans[i].init (*index_maps[i], outer_map, inner_sets, plan); + + outer_map.sort (); + + if (retain_adv_map) + { + for (hb_codepoint_t gid = 0; gid < plan->num_output_glyphs (); gid++) + if (inner_sets[0]->has (gid)) + inner_maps[0].add (gid); + else + inner_maps[0].skip (); + } + else + { + inner_maps[0].add_set (adv_set); + hb_set_subtract (inner_sets[0], adv_set); + inner_maps[0].add_set (inner_sets[0]); + } + + for (unsigned int i = 1; i < inner_maps.length; i++) + inner_maps[i].add_set (inner_sets[i]); + + for (unsigned int i = 0; i < index_maps.length; i++) + index_map_plans[i].remap (index_maps[i], outer_map, inner_maps, plan); + } + + void fini () + { + for (unsigned int i = 0; i < inner_sets.length; i++) + hb_set_destroy (inner_sets[i]); + hb_set_destroy (adv_set); + inner_maps.fini_deep (); + index_map_plans.fini_deep (); + } + + hb_inc_bimap_t outer_map; + hb_vector_t<hb_inc_bimap_t> inner_maps; + hb_vector_t<index_map_subset_plan_t> index_map_plans; + const VariationStore *var_store; + + protected: + hb_vector_t<hb_set_t *> inner_sets; + hb_set_t *adv_set; +}; + +/* + * HVAR -- Horizontal Metrics Variations + * https://docs.microsoft.com/en-us/typography/opentype/spec/hvar + * VVAR -- Vertical Metrics Variations + * https://docs.microsoft.com/en-us/typography/opentype/spec/vvar + */ +#define HB_OT_TAG_HVAR HB_TAG('H','V','A','R') +#define HB_OT_TAG_VVAR HB_TAG('V','V','A','R') + +struct HVARVVAR +{ + static constexpr hb_tag_t HVARTag = HB_OT_TAG_HVAR; + static constexpr hb_tag_t VVARTag = HB_OT_TAG_VVAR; + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (version.sanitize (c) && + likely (version.major == 1) && + varStore.sanitize (c, this) && + advMap.sanitize (c, this) && + lsbMap.sanitize (c, this) && + rsbMap.sanitize (c, this)); + } + + void listup_index_maps (hb_vector_t<const DeltaSetIndexMap *> &index_maps) const + { + index_maps.push (&(this+advMap)); + index_maps.push (&(this+lsbMap)); + index_maps.push (&(this+rsbMap)); + } + + bool serialize_index_maps (hb_serialize_context_t *c, + const hb_array_t<index_map_subset_plan_t> &im_plans) + { + TRACE_SERIALIZE (this); + if (im_plans[index_map_subset_plan_t::ADV_INDEX].is_identity ()) + advMap = 0; + else if (unlikely (!advMap.serialize (c, this).serialize (c, im_plans[index_map_subset_plan_t::ADV_INDEX]))) + return_trace (false); + if (im_plans[index_map_subset_plan_t::LSB_INDEX].is_identity ()) + lsbMap = 0; + else if (unlikely (!lsbMap.serialize (c, this).serialize (c, im_plans[index_map_subset_plan_t::LSB_INDEX]))) + return_trace (false); + if (im_plans[index_map_subset_plan_t::RSB_INDEX].is_identity ()) + rsbMap = 0; + else if (unlikely (!rsbMap.serialize (c, this).serialize (c, im_plans[index_map_subset_plan_t::RSB_INDEX]))) + return_trace (false); + + return_trace (true); + } + + template <typename T> + bool _subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); + hvarvvar_subset_plan_t hvar_plan; + hb_vector_t<const DeltaSetIndexMap *> + index_maps; + + ((T*)this)->listup_index_maps (index_maps); + hvar_plan.init (index_maps.as_array (), this+varStore, c->plan); + + T *out = c->serializer->allocate_min<T> (); + if (unlikely (!out)) return_trace (false); + + out->version.major = 1; + out->version.minor = 0; + + if (unlikely (!out->varStore.serialize (c->serializer, out) + .serialize (c->serializer, hvar_plan.var_store, hvar_plan.inner_maps.as_array ()))) + return_trace (false); + + return_trace (out->T::serialize_index_maps (c->serializer, + hvar_plan.index_map_plans.as_array ())); + } + + float get_advance_var (hb_codepoint_t glyph, hb_font_t *font) const + { + unsigned int varidx = (this+advMap).map (glyph); + return (this+varStore).get_delta (varidx, font->coords, font->num_coords); + } + + float get_side_bearing_var (hb_codepoint_t glyph, + const int *coords, unsigned int coord_count) const + { + if (!has_side_bearing_deltas ()) return 0.f; + unsigned int varidx = (this+lsbMap).map (glyph); + return (this+varStore).get_delta (varidx, coords, coord_count); + } + + bool has_side_bearing_deltas () const { return lsbMap && rsbMap; } + + protected: + FixedVersion<>version; /* Version of the metrics variation table + * initially set to 0x00010000u */ + LOffsetTo<VariationStore> + varStore; /* Offset to item variation store table. */ + LOffsetTo<DeltaSetIndexMap> + advMap; /* Offset to advance var-idx mapping. */ + LOffsetTo<DeltaSetIndexMap> + lsbMap; /* Offset to lsb/tsb var-idx mapping. */ + LOffsetTo<DeltaSetIndexMap> + rsbMap; /* Offset to rsb/bsb var-idx mapping. */ + + public: + DEFINE_SIZE_STATIC (20); +}; + +struct HVAR : HVARVVAR { + static constexpr hb_tag_t tableTag = HB_OT_TAG_HVAR; + bool subset (hb_subset_context_t *c) const { return HVARVVAR::_subset<HVAR> (c); } +}; +struct VVAR : HVARVVAR { + static constexpr hb_tag_t tableTag = HB_OT_TAG_VVAR; + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (static_cast<const HVARVVAR *> (this)->sanitize (c) && + vorgMap.sanitize (c, this)); + } + + void listup_index_maps (hb_vector_t<const DeltaSetIndexMap *> &index_maps) const + { + HVARVVAR::listup_index_maps (index_maps); + index_maps.push (&(this+vorgMap)); + } + + bool serialize_index_maps (hb_serialize_context_t *c, + const hb_array_t<index_map_subset_plan_t> &im_plans) + { + TRACE_SERIALIZE (this); + if (unlikely (!HVARVVAR::serialize_index_maps (c, im_plans))) + return_trace (false); + if (!im_plans[index_map_subset_plan_t::VORG_INDEX].get_map_count ()) + vorgMap = 0; + else if (unlikely (!vorgMap.serialize (c, this).serialize (c, im_plans[index_map_subset_plan_t::VORG_INDEX]))) + return_trace (false); + + return_trace (true); + } + + bool subset (hb_subset_context_t *c) const { return HVARVVAR::_subset<VVAR> (c); } + + protected: + LOffsetTo<DeltaSetIndexMap> + vorgMap; /* Offset to vertical-origin var-idx mapping. */ + + public: + DEFINE_SIZE_STATIC (24); +}; + +} /* namespace OT */ + + +#endif /* HB_OT_VAR_HVAR_TABLE_HH */ |