/*
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* Copyright © 2011,2012 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_HHEA_TABLE_HH
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#define HB_OT_HHEA_TABLE_HH
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#include "hb-open-type.hh"
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/*
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* hhea -- Horizontal Header
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* https://docs.microsoft.com/en-us/typography/opentype/spec/hhea
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* vhea -- Vertical Header
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* https://docs.microsoft.com/en-us/typography/opentype/spec/vhea
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*/
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#define HB_OT_TAG_hhea HB_TAG('h','h','e','a')
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#define HB_OT_TAG_vhea HB_TAG('v','h','e','a')
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namespace OT {
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template <typename T>
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struct _hea
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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) && likely (version.major == 1));
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}
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public:
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FixedVersion<>version; /* 0x00010000u for version 1.0. */
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FWORD ascender; /* Typographic ascent. */
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FWORD descender; /* Typographic descent. */
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FWORD lineGap; /* Typographic line gap. */
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UFWORD advanceMax; /* Maximum advance width/height value in
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* metrics table. */
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FWORD minLeadingBearing; /* Minimum left/top sidebearing value in
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* metrics table. */
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FWORD minTrailingBearing; /* Minimum right/bottom sidebearing value;
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* calculated as Min(aw - lsb -
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* (xMax - xMin)) for horizontal. */
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FWORD maxExtent; /* horizontal: Max(lsb + (xMax - xMin)),
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* vertical: minLeadingBearing+(yMax-yMin). */
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HBINT16 caretSlopeRise; /* Used to calculate the slope of the
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* cursor (rise/run); 1 for vertical caret,
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* 0 for horizontal.*/
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HBINT16 caretSlopeRun; /* 0 for vertical caret, 1 for horizontal. */
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HBINT16 caretOffset; /* The amount by which a slanted
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* highlight on a glyph needs
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* to be shifted to produce the
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* best appearance. Set to 0 for
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* non-slanted fonts. */
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HBINT16 reserved1; /* Set to 0. */
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HBINT16 reserved2; /* Set to 0. */
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HBINT16 reserved3; /* Set to 0. */
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HBINT16 reserved4; /* Set to 0. */
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HBINT16 metricDataFormat; /* 0 for current format. */
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HBUINT16 numberOfLongMetrics; /* Number of LongMetric entries in metric
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* table. */
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public:
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DEFINE_SIZE_STATIC (36);
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};
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struct hhea : _hea<hhea> {
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enum { tableTag = HB_OT_TAG_hhea };
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};
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struct vhea : _hea<vhea> {
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enum { tableTag = HB_OT_TAG_vhea };
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};
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} /* namespace OT */
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#endif /* HB_OT_HHEA_TABLE_HH */
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