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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 | 128 |
1 files changed, 128 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..d27ebb39c0 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-var-mvar-table.hh @@ -0,0 +1,128 @@ +/* + * 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-layout-common.hh" + + +namespace OT { + + +struct VariationValueRecord +{ + bool sanitize (hb_sanitize_context_t *c) const + { + TRACE_SANITIZE (this); + return_trace (c->check_struct (this)); + } + + 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) && + likely (version.major == 1) && + c->check_struct (this) && + valueRecordSize >= VariationValueRecord::static_size && + varStore.sanitize (c, this) && + c->check_range (valuesZ.arrayZ, + valueRecordCount, + valueRecordSize)); + } + + 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 */ |