120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
/*
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* Copyright © 2017 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_VAR_MVAR_TABLE_HH
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#define HB_OT_VAR_MVAR_TABLE_HH
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#include "hb-ot-layout-common.hh"
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namespace OT {
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struct VariationValueRecord
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{
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (c->check_struct (this));
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}
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public:
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Tag valueTag; /* Four-byte tag identifying a font-wide measure. */
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HBUINT32 varIdx; /* Outer/inner index into VariationStore item. */
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public:
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DEFINE_SIZE_STATIC (8);
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};
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/*
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* MVAR -- Metrics Variations
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* https://docs.microsoft.com/en-us/typography/opentype/spec/mvar
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*/
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#define HB_OT_TAG_MVAR HB_TAG('M','V','A','R')
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struct MVAR
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{
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static constexpr hb_tag_t tableTag = HB_OT_TAG_MVAR;
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bool sanitize (hb_sanitize_context_t *c) const
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{
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TRACE_SANITIZE (this);
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return_trace (version.sanitize (c) &&
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likely (version.major == 1) &&
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c->check_struct (this) &&
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valueRecordSize >= VariationValueRecord::static_size &&
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varStore.sanitize (c, this) &&
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c->check_range (valuesZ.arrayZ,
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valueRecordCount,
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valueRecordSize));
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}
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float get_var (hb_tag_t tag,
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const int *coords, unsigned int coord_count) const
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{
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const VariationValueRecord *record;
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record = (VariationValueRecord *) hb_bsearch (tag,
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(const VariationValueRecord *)
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(const HBUINT8 *) valuesZ,
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valueRecordCount, valueRecordSize,
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tag_compare);
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if (!record)
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return 0.;
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return (this+varStore).get_delta (record->varIdx, coords, coord_count);
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}
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protected:
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static int tag_compare (const void *pa, const void *pb)
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{
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const hb_tag_t *a = (const hb_tag_t *) pa;
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const Tag *b = (const Tag *) pb;
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return b->cmp (*a);
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}
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protected:
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FixedVersion<>version; /* Version of the metrics variation table
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* initially set to 0x00010000u */
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HBUINT16 reserved; /* Not used; set to 0. */
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HBUINT16 valueRecordSize;/* The size in bytes of each value record —
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* must be greater than zero. */
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HBUINT16 valueRecordCount;/* The number of value records — may be zero. */
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Offset16To<VariationStore>
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varStore; /* Offset to item variation store table. */
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UnsizedArrayOf<HBUINT8>
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valuesZ; /* Array of value records. The records must be
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* in binary order of their valueTag field. */
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public:
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DEFINE_SIZE_ARRAY (12, valuesZ);
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};
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} /* namespace OT */
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#endif /* HB_OT_VAR_MVAR_TABLE_HH */
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