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