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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-var-mvar-table.hh')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-var-mvar-table.hh | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-var-mvar-table.hh b/gfx/harfbuzz/src/hb-ot-var-mvar-table.hh new file mode 100644 index 0000000000..6d69777618 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var-mvar-table.hh @@ -0,0 +1,184 @@ +/* + * 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_MVAR_TABLE_HH +#define HB_OT_VAR_MVAR_TABLE_HH + +#include "hb-ot-var-common.hh" + + +namespace OT { + + +struct VariationValueRecord +{ + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + bool subset (hb_subset_context_t *c, + const hb_map_t& varidx_map) const + { + TRACE_SUBSET (this); + auto *out = c->serializer->embed (*this); + if (unlikely (!out)) return_trace (false); + + hb_codepoint_t *new_idx; + return_trace (c->serializer->check_assign (out->varIdx, + (varidx_map.has (varIdx, &new_idx)) ? *new_idx : HB_OT_LAYOUT_NO_VARIATIONS_INDEX, + HB_SERIALIZE_ERROR_INT_OVERFLOW)); + } + + public: + Tag valueTag; /* Four-byte tag identifying a font-wide measure. */ + VarIdx varIdx; /* Outer/inner index into VariationStore item. */ + + public: + DEFINE_SIZE_STATIC (8); +}; + + +/* + * MVAR -- Metrics Variations + * https://docs.microsoft.com/en-us/typography/opentype/spec/mvar + */ +#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R') + +struct MVAR +{ + static constexpr hb_tag_t tableTag = HB_OT_TAG_MVAR; + + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (version.sanitize (c) && + hb_barrier () && + likely (version.major == 1) && + c->check_struct (this) && + hb_barrier () && + valueRecordSize >= VariationValueRecord::static_size && + varStore.sanitize (c, this) && + c->check_range (valuesZ.arrayZ, + valueRecordCount, + valueRecordSize)); + } + + bool subset (hb_subset_context_t *c) const + { + TRACE_SUBSET (this); +#ifdef HB_NO_VAR + return_trace (false); +#endif + + if (c->plan->all_axes_pinned) + return_trace (false); + + MVAR *out = c->serializer->start_embed (*this); + if (unlikely (!c->serializer->extend_min (out))) return_trace (false); + out->version = version; + out->reserved = reserved; + out->valueRecordSize = valueRecordSize; + out->valueRecordCount = valueRecordCount; + + item_variations_t item_vars; + const VariationStore& src_var_store = this+varStore; + + if (!item_vars.instantiate (src_var_store, c->plan)) + return_trace (false); + + /* serialize varstore */ + if (!out->varStore.serialize_serialize (c->serializer, item_vars.has_long_word (), + c->plan->axis_tags, + item_vars.get_region_list (), + item_vars.get_vardata_encodings ())) + return_trace (false); + + /* serialize value records array */ + unsigned value_rec_count = valueRecordCount; + const VariationValueRecord *record = reinterpret_cast<const VariationValueRecord*> (valuesZ.arrayZ); + for (unsigned i = 0; i < value_rec_count; i++) + { + if (!record->subset (c, item_vars.get_varidx_map ())) return_trace (false); + record++; + } + return_trace (true); + } + + float get_var (hb_tag_t tag, + const int *coords, unsigned int coord_count) const + { + const VariationValueRecord *record; + record = (VariationValueRecord *) hb_bsearch (tag, + (const VariationValueRecord *) + (const HBUINT8 *) valuesZ, + valueRecordCount, valueRecordSize, + tag_compare); + if (!record) + return 0.; + + return (this+varStore).get_delta (record->varIdx, coords, coord_count); + } + +protected: + static int tag_compare (const void *pa, const void *pb) + { + const hb_tag_t *a = (const hb_tag_t *) pa; + const Tag *b = (const Tag *) pb; + return b->cmp (*a); + } + + protected: + FixedVersion<>version; /* Version of the metrics variation table + * initially set to 0x00010000u */ + HBUINT16 reserved; /* Not used; set to 0. */ + HBUINT16 valueRecordSize;/* The size in bytes of each value record — + * must be greater than zero. */ + HBUINT16 valueRecordCount;/* The number of value records — may be zero. */ + Offset16To<VariationStore> + varStore; /* Offset to item variation store table. */ + UnsizedArrayOf<HBUINT8> + valuesZ; /* Array of value records. The records must be + * in binary order of their valueTag field. */ + + public: + DEFINE_SIZE_ARRAY (12, valuesZ); +}; + +} /* namespace OT */ + + +#define HB_ADD_MVAR_VAR(tag, field) \ + c->serializer->check_assign (table->field, \ + roundf (table->field + \ + MVAR.get_var (tag, \ + c->plan->normalized_coords.arrayZ, \ + c->plan->normalized_coords.length)), \ + HB_SERIALIZE_ERROR_INT_OVERFLOW) + + +#endif /* HB_OT_VAR_MVAR_TABLE_HH */ |