223 lines
7.7 KiB
C++
223 lines
7.7 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_AAT_LAYOUT_FEAT_TABLE_HH
|
|
#define HB_AAT_LAYOUT_FEAT_TABLE_HH
|
|
|
|
#include "hb-aat-layout-common.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
|
|
{
|
|
friend struct FeatureName;
|
|
|
|
int cmp (hb_aat_layout_feature_selector_t key) const
|
|
{ return (int) key - (int) setting; }
|
|
|
|
hb_aat_layout_feature_selector_t get_selector () const
|
|
{ return (hb_aat_layout_feature_selector_t) (unsigned) setting; }
|
|
|
|
hb_aat_layout_feature_selector_info_t get_info (hb_aat_layout_feature_selector_t default_selector) const
|
|
{
|
|
return {
|
|
nameIndex,
|
|
(hb_aat_layout_feature_selector_t) (unsigned int) setting,
|
|
default_selector == HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID
|
|
? (hb_aat_layout_feature_selector_t) (setting + 1)
|
|
: default_selector,
|
|
0
|
|
};
|
|
}
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (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);
|
|
};
|
|
DECLARE_NULL_NAMESPACE_BYTES (AAT, SettingName);
|
|
|
|
struct feat;
|
|
|
|
struct FeatureName
|
|
{
|
|
int cmp (hb_aat_layout_feature_type_t key) const
|
|
{ return (int) key - (int) feature; }
|
|
|
|
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. */
|
|
};
|
|
|
|
unsigned int get_selector_infos (unsigned int start_offset,
|
|
unsigned int *selectors_count, /* IN/OUT. May be NULL. */
|
|
hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
|
|
unsigned int *pdefault_index, /* OUT. May be NULL. */
|
|
const void *base) const
|
|
{
|
|
hb_array_t< const SettingName> settings_table = (base+settingTableZ).as_array (nSettings);
|
|
|
|
static_assert (Index::NOT_FOUND_INDEX == HB_AAT_LAYOUT_NO_SELECTOR_INDEX, "");
|
|
|
|
hb_aat_layout_feature_selector_t default_selector = HB_AAT_LAYOUT_FEATURE_SELECTOR_INVALID;
|
|
unsigned int default_index = Index::NOT_FOUND_INDEX;
|
|
if (featureFlags & Exclusive)
|
|
{
|
|
default_index = (featureFlags & NotDefault) ? featureFlags & IndexMask : 0;
|
|
default_selector = settings_table[default_index].get_selector ();
|
|
}
|
|
if (pdefault_index)
|
|
*pdefault_index = default_index;
|
|
|
|
if (selectors_count)
|
|
{
|
|
+ settings_table.sub_array (start_offset, selectors_count)
|
|
| hb_map ([=] (const SettingName& setting) { return setting.get_info (default_selector); })
|
|
| hb_sink (hb_array (selectors, *selectors_count))
|
|
;
|
|
}
|
|
return settings_table.length;
|
|
}
|
|
|
|
hb_aat_layout_feature_type_t get_feature_type () const
|
|
{ return (hb_aat_layout_feature_type_t) (unsigned int) feature; }
|
|
|
|
hb_ot_name_id_t get_feature_name_id () const { return nameIndex; }
|
|
|
|
bool is_exclusive () const { return featureFlags & Exclusive; }
|
|
|
|
/* A FeatureName with no settings is meaningless */
|
|
bool has_data () const { return nSettings; }
|
|
|
|
bool sanitize (hb_sanitize_context_t *c, const void *base) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (c->check_struct (this) &&
|
|
(base+settingTableZ).sanitize (c, nSettings)));
|
|
}
|
|
|
|
protected:
|
|
HBUINT16 feature; /* Feature type. */
|
|
HBUINT16 nSettings; /* The number of records in the setting name array. */
|
|
NNOffset32To<UnsizedArrayOf<SettingName>>
|
|
settingTableZ; /* 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 constexpr hb_tag_t tableTag = HB_AAT_TAG_feat;
|
|
|
|
bool has_data () const { return version.to_int (); }
|
|
|
|
unsigned int get_feature_types (unsigned int start_offset,
|
|
unsigned int *count,
|
|
hb_aat_layout_feature_type_t *features) const
|
|
{
|
|
if (count)
|
|
{
|
|
+ namesZ.as_array (featureNameCount).sub_array (start_offset, count)
|
|
| hb_map (&FeatureName::get_feature_type)
|
|
| hb_sink (hb_array (features, *count))
|
|
;
|
|
}
|
|
return featureNameCount;
|
|
}
|
|
|
|
bool exposes_feature (hb_aat_layout_feature_type_t feature_type) const
|
|
{ return get_feature (feature_type).has_data (); }
|
|
|
|
const FeatureName& get_feature (hb_aat_layout_feature_type_t feature_type) const
|
|
{ return namesZ.bsearch (featureNameCount, feature_type); }
|
|
|
|
hb_ot_name_id_t get_feature_name_id (hb_aat_layout_feature_type_t feature) const
|
|
{ return get_feature (feature).get_feature_name_id (); }
|
|
|
|
unsigned int get_selector_infos (hb_aat_layout_feature_type_t feature_type,
|
|
unsigned int start_offset,
|
|
unsigned int *selectors_count, /* IN/OUT. May be NULL. */
|
|
hb_aat_layout_feature_selector_info_t *selectors, /* OUT. May be NULL. */
|
|
unsigned int *default_index /* OUT. May be NULL. */) const
|
|
{
|
|
return get_feature (feature_type).get_selector_infos (start_offset, selectors_count, selectors,
|
|
default_index, this);
|
|
}
|
|
|
|
bool sanitize (hb_sanitize_context_t *c) const
|
|
{
|
|
TRACE_SANITIZE (this);
|
|
return_trace (likely (c->check_struct (this) &&
|
|
version.major == 1 &&
|
|
namesZ.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). */
|
|
SortedUnsizedArrayOf<FeatureName>
|
|
namesZ; /* The feature name array. */
|
|
public:
|
|
DEFINE_SIZE_ARRAY (12, namesZ);
|
|
};
|
|
|
|
} /* namespace AAT */
|
|
|
|
#endif /* HB_AAT_LAYOUT_FEAT_TABLE_HH */
|