harfbuzz/src/hb-ot-stat-table.hh

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9.0 KiB
C++

/*
* Copyright © 2018 Ebrahim Byagowi
*
* 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.
*/
#ifndef HB_OT_STAT_TABLE_HH
#define HB_OT_STAT_TABLE_HH
#include "hb-open-type.hh"
#include "hb-ot-layout-common.hh"
/*
* STAT -- Style Attributes
* https://docs.microsoft.com/en-us/typography/opentype/spec/stat
*/
#define HB_OT_TAG_STAT HB_TAG('S','T','A','T')
namespace OT {
enum
{
OLDER_SIBLING_FONT_ATTRIBUTE = 0x0001, /* If set, this axis value table
* provides axis value information
* that is applicable to other fonts
* within the same font family. This
* is used if the other fonts were
* released earlier and did not include
* information about values for some axis.
* If newer versions of the other
* fonts include the information
* themselves and are present,
* then this record is ignored. */
ELIDABLE_AXIS_VALUE_NAME = 0x0002 /* If set, it indicates that the axis
* value represents the “normal” value
* for the axis and may be omitted when
* composing name strings. */
// Reserved = 0xFFFC /* Reserved for future use — set to zero. */
};
struct AxisValueFormat1
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 format; /* Format identifier — set to 1. */
HBUINT16 axisIndex; /* Zero-base index into the axis record array
* identifying the axis of design variation
* to which the axis value record applies.
* Must be less than designAxisCount. */
HBUINT16 flags; /* Flags — see below for details. */
NameID valueNameID; /* The name ID for entries in the 'name' table
* that provide a display string for this
* attribute value. */
Fixed value; /* A numeric value for this attribute value. */
public:
DEFINE_SIZE_STATIC (12);
};
struct AxisValueFormat2
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 format; /* Format identifier — set to 2. */
HBUINT16 axisIndex; /* Zero-base index into the axis record array
* identifying the axis of design variation
* to which the axis value record applies.
* Must be less than designAxisCount. */
HBUINT16 flags; /* Flags — see below for details. */
NameID valueNameID; /* The name ID for entries in the 'name' table
* that provide a display string for this
* attribute value. */
Fixed nominalValue; /* A numeric value for this attribute value. */
Fixed rangeMinValue; /* The minimum value for a range associated
* with the specified name ID. */
Fixed rangeMaxValue; /* The maximum value for a range associated
* with the specified name ID. */
public:
DEFINE_SIZE_STATIC (20);
};
struct AxisValueFormat3
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 format; /* Format identifier — set to 3. */
HBUINT16 axisIndex; /* Zero-base index into the axis record array
* identifying the axis of design variation
* to which the axis value record applies.
* Must be less than designAxisCount. */
HBUINT16 flags; /* Flags — see below for details. */
NameID valueNameID; /* The name ID for entries in the 'name' table
* that provide a display string for this
* attribute value. */
Fixed value; /* A numeric value for this attribute value. */
Fixed linkedValue; /* The numeric value for a style-linked mapping
* from this value. */
public:
DEFINE_SIZE_STATIC (16);
};
struct AxisValueRecord
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 axisIndex; /* Zero-base index into the axis record array
* identifying the axis to which this value
* applies. Must be less than designAxisCount. */
Fixed value; /* A numeric value for this attribute value. */
public:
DEFINE_SIZE_STATIC (6);
};
struct AxisValueFormat4
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 format; /* Format identifier — set to 4. */
HBUINT16 axisCount; /* The total number of axes contributing to
* this axis-values combination. */
HBUINT16 flags; /* Flags — see below for details. */
NameID valueNameID; /* The name ID for entries in the 'name' table
* that provide a display string for this
* attribute value. */
UnsizedArrayOf<AxisValueRecord>
axisValues; /* Array of AxisValue records that provide the
* combination of axis values, one for each
* contributing axis. */
public:
DEFINE_SIZE_ARRAY (8, axisValues);
};
struct AxisValue
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (unlikely (c->check_struct (this)))
return_trace (false);
switch (u.format)
{
case 1: return_trace (likely (u.format1.sanitize (c)));
case 2: return_trace (likely (u.format2.sanitize (c)));
case 3: return_trace (likely (u.format3.sanitize (c)));
case 4: return_trace (likely (u.format4.sanitize (c)));
default: return_trace (true);
}
}
protected:
union
{
HBUINT16 format;
AxisValueFormat1 format1;
AxisValueFormat2 format2;
AxisValueFormat3 format3;
AxisValueFormat4 format4;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct StatAxisRecord
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
Tag tag; /* A tag identifying the axis of design variation. */
NameID nameID; /* The name ID for entries in the 'name' table that
* provide a display string for this axis. */
HBUINT16 ordering; /* A value that applications can use to determine
* primary sorting of face names, or for ordering
* of descriptors when composing family or face names. */
public:
DEFINE_SIZE_STATIC (8);
};
struct STAT
{
static constexpr hb_tag_t tableTag = HB_OT_TAG_STAT;
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
majorVersion == 1 &&
minorVersion > 0 &&
designAxesOffset.sanitize (c, this, designAxisCount) &&
offsetToAxisValueOffsets.sanitize (c, this, axisValueCount, &(this+offsetToAxisValueOffsets))));
}
protected:
HBUINT16 majorVersion; /* Major version number of the style attributes
* table — set to 1. */
HBUINT16 minorVersion; /* Minor version number of the style attributes
* table — set to 2. */
HBUINT16 designAxisSize; /* The size in bytes of each axis record. */
HBUINT16 designAxisCount;/* The number of design axis records. In a
* font with an 'fvar' table, this value must be
* greater than or equal to the axisCount value
* in the 'fvar' table. In all fonts, must
* be greater than zero if axisValueCount
* is greater than zero. */
LNNOffsetTo<UnsizedArrayOf<StatAxisRecord> >
designAxesOffset;
/* Offset in bytes from the beginning of
* the STAT table to the start of the design
* axes array. If designAxisCount is zero,
* set to zero; if designAxisCount is greater
* than zero, must be greater than zero. */
HBUINT16 axisValueCount; /* The number of axis value tables. */
LNNOffsetTo<UnsizedArrayOf<OffsetTo<AxisValue> > >
offsetToAxisValueOffsets;
/* Offset in bytes from the beginning of
* the STAT table to the start of the design
* axes value offsets array. If axisValueCount
* is zero, set to zero; if axisValueCount is
* greater than zero, must be greater than zero. */
NameID elidedFallbackNameID;
/* Name ID used as fallback when projection of
* names into a particular font model produces
* a subfamily name containing only elidable
* elements. */
public:
DEFINE_SIZE_STATIC (20);
};
} /* namespace OT */
#endif /* HB_OT_STAT_TABLE_HH */