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/*
* 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_AAT_LAYOUT_FEAT_TABLE_HH
#define HB_AAT_LAYOUT_FEAT_TABLE_HH
#include "hb-aat-layout-common-private.hh"
/*
* feat -- Feature Name
* https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6feat.html
*/
#define HB_AAT_TAG_feat HB_TAG('f','e','a','t')
namespace AAT {
struct SettingName
{
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this)));
}
protected:
HBUINT16 setting; /* The setting. */
NameID nameIndex; /* The name table index for the setting's name. */
public:
DEFINE_SIZE_STATIC (4);
};
struct FeatureName
{
inline bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
(base+settingTable).sanitize (c, nSettings)));
}
enum {
Exclusive = 0x8000, /* If set, the feature settings are mutually exclusive. */
NotDefault = 0x4000, /* If clear, then the setting with an index of 0 in
* the setting name array for this feature should
* be taken as the default for the feature
* (if one is required). If set, then bits 0-15 of this
* featureFlags field contain the index of the setting
* which is to be taken as the default. */
IndexMask = 0x00FF /* If bits 30 and 31 are set, then these sixteen bits
* indicate the index of the setting in the setting name
* array for this feature which should be taken
* as the default. */
};
protected:
HBUINT16 feature; /* Feature type. */
HBUINT16 nSettings; /* The number of records in the setting name array. */
LOffsetTo<UnsizedArrayOf<SettingName> >
settingTable; /* Offset in bytes from the beginning of this table to
* this feature's setting name array. The actual type of
* record this offset refers to will depend on the
* exclusivity value, as described below. */
HBUINT16 featureFlags; /* Single-bit flags associated with the feature type. */
HBINT16 nameIndex; /* The name table index for the feature's name.
* This index has values greater than 255 and
* less than 32768. */
public:
DEFINE_SIZE_STATIC (12);
};
struct feat
{
static const hb_tag_t tableTag = HB_AAT_TAG_feat;
inline bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (likely (c->check_struct (this) &&
names.sanitize (c, featureNameCount, this)));
}
protected:
FixedVersion<>version; /* Version number of the feature name table
* (0x00010000 for the current version). */
HBUINT16 featureNameCount;
/* The number of entries in the feature name array. */
HBUINT16 reserved1; /* Reserved (set to zero). */
HBUINT32 reserved2; /* Reserved (set to zero). */
UnsizedArrayOf<FeatureName>
names; /* The feature name array. */
public:
DEFINE_SIZE_STATIC (24);
};
} /* namespace AAT */
#endif /* HB_AAT_LAYOUT_FEAT_TABLE_HH */
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