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/*
* Copyright © 2007,2008,2009 Red Hat, Inc.
* Copyright © 2010,2012 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.
*
* Red Hat Author(s): Behdad Esfahbod
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_LAYOUT_COMMON_HH
#define HB_OT_LAYOUT_COMMON_HH
#include "hb.hh"
#include "hb-ot-layout.hh"
#include "hb-open-type.hh"
#include "hb-set.hh"
#include "hb-bimap.hh"
#ifndef HB_MAX_NESTING_LEVEL
#define HB_MAX_NESTING_LEVEL 64
#endif
#ifndef HB_MAX_CONTEXT_LENGTH
#define HB_MAX_CONTEXT_LENGTH 64
#endif
#ifndef HB_CLOSURE_MAX_STAGES
/*
* The maximum number of times a lookup can be applied during shaping.
* Used to limit the number of iterations of the closure algorithm.
* This must be larger than the number of times add_pause() is
* called in a collect_features call of any shaper.
*/
#define HB_CLOSURE_MAX_STAGES 32
#endif
#ifndef HB_MAX_SCRIPTS
#define HB_MAX_SCRIPTS 500
#endif
#ifndef HB_MAX_LANGSYS
#define HB_MAX_LANGSYS 2000
#endif
#ifndef HB_MAX_LANGSYS_FEATURE_COUNT
#define HB_MAX_LANGSYS_FEATURE_COUNT 50000
#endif
#ifndef HB_MAX_FEATURES
#define HB_MAX_FEATURES 750
#endif
#ifndef HB_MAX_FEATURE_INDICES
#define HB_MAX_FEATURE_INDICES 1500
#endif
#ifndef HB_MAX_LOOKUP_VISIT_COUNT
#define HB_MAX_LOOKUP_VISIT_COUNT 35000
#endif
namespace OT {
#define NOT_COVERED ((unsigned int) -1)
template<typename Iterator>
static inline void Coverage_serialize (hb_serialize_context_t *c,
Iterator it);
template<typename Iterator>
static inline void ClassDef_serialize (hb_serialize_context_t *c,
Iterator it);
static void ClassDef_remap_and_serialize (
hb_serialize_context_t *c,
const hb_set_t &klasses,
bool use_class_zero,
hb_sorted_vector_t<hb_pair_t<hb_codepoint_t, hb_codepoint_t>> &glyph_and_klass, /* IN/OUT */
hb_map_t *klass_map /*IN/OUT*/);
struct hb_prune_langsys_context_t
{
hb_prune_langsys_context_t (const void *table_,
hb_hashmap_t<unsigned, hb_set_t *> *script_langsys_map_,
const hb_map_t *duplicate_feature_map_,
hb_set_t *new_collected_feature_indexes_)
:table (table_),
script_langsys_map (script_langsys_map_),
duplicate_feature_map (duplicate_feature_map_),
new_feature_indexes (new_collected_feature_indexes_),
script_count (0),langsys_feature_count (0) {}
bool visitScript ()
{ return script_count++ < HB_MAX_SCRIPTS; }
bool visitLangsys (unsigned feature_count)
{
langsys_feature_count += feature_count;
return langsys_feature_count < HB_MAX_LANGSYS_FEATURE_COUNT;
}
public:
const void *table;
hb_hashmap_t<unsigned, hb_set_t *> *script_langsys_map;
const hb_map_t *duplicate_feature_map;
hb_set_t *new_feature_indexes;
private:
unsigned script_count;
unsigned langsys_feature_count;
};
struct hb_subset_layout_context_t :
hb_dispatch_context_t<hb_subset_layout_context_t, hb_empty_t, HB_DEBUG_SUBSET>
{
const char *get_name () { return "SUBSET_LAYOUT"; }
static return_t default_return_value () { return hb_empty_t (); }
bool visitScript ()
{
return script_count++ < HB_MAX_SCRIPTS;
}
bool visitLangSys ()
{
return langsys_count++ < HB_MAX_LANGSYS;
}
bool visitFeatureIndex (int count)
{
feature_index_count += count;
return feature_index_count < HB_MAX_FEATURE_INDICES;
}
bool visitLookupIndex()
{
lookup_index_count++;
return lookup_index_count < HB_MAX_LOOKUP_VISIT_COUNT;
}
hb_subset_context_t *subset_context;
const hb_tag_t table_tag;
const hb_map_t *lookup_index_map;
const hb_hashmap_t<unsigned, hb_set_t *> *script_langsys_map;
const hb_map_t *feature_index_map;
unsigned cur_script_index;
hb_subset_layout_context_t (hb_subset_context_t *c_,
hb_tag_t tag_,
hb_map_t *lookup_map_,
hb_hashmap_t<unsigned, hb_set_t *> *script_langsys_map_,
hb_map_t *feature_index_map_) :
subset_context (c_),
table_tag (tag_),
lookup_index_map (lookup_map_),
script_langsys_map (script_langsys_map_),
feature_index_map (feature_index_map_),
cur_script_index (0xFFFFu),
script_count (0),
langsys_count (0),
feature_index_count (0),
lookup_index_count (0)
{}
private:
unsigned script_count;
unsigned langsys_count;
unsigned feature_index_count;
unsigned lookup_index_count;
};
struct hb_collect_variation_indices_context_t :
hb_dispatch_context_t<hb_collect_variation_indices_context_t>
{
template <typename T>
return_t dispatch (const T &obj) { obj.collect_variation_indices (this); return hb_empty_t (); }
static return_t default_return_value () { return hb_empty_t (); }
hb_set_t *layout_variation_indices;
const hb_set_t *glyph_set;
const hb_map_t *gpos_lookups;
hb_collect_variation_indices_context_t (hb_set_t *layout_variation_indices_,
const hb_set_t *glyph_set_,
const hb_map_t *gpos_lookups_) :
layout_variation_indices (layout_variation_indices_),
glyph_set (glyph_set_),
gpos_lookups (gpos_lookups_) {}
};
template<typename OutputArray>
struct subset_offset_array_t
{
subset_offset_array_t (hb_subset_context_t *subset_context_,
OutputArray& out_,
const void *base_) : subset_context (subset_context_),
out (out_), base (base_) {}
template <typename T>
bool operator () (T&& offset)
{
auto snap = subset_context->serializer->snapshot ();
auto *o = out.serialize_append (subset_context->serializer);
if (unlikely (!o)) return false;
bool ret = o->serialize_subset (subset_context, offset, base);
if (!ret)
{
out.pop ();
subset_context->serializer->revert (snap);
}
return ret;
}
private:
hb_subset_context_t *subset_context;
OutputArray &out;
const void *base;
};
template<typename OutputArray, typename Arg>
struct subset_offset_array_arg_t
{
subset_offset_array_arg_t (hb_subset_context_t *subset_context_,
OutputArray& out_,
const void *base_,
Arg &&arg_) : subset_context (subset_context_), out (out_),
base (base_), arg (arg_) {}
template <typename T>
bool operator () (T&& offset)
{
auto snap = subset_context->serializer->snapshot ();
auto *o = out.serialize_append (subset_context->serializer);
if (unlikely (!o)) return false;
bool ret = o->serialize_subset (subset_context, offset, base, arg);
if (!ret)
{
out.pop ();
subset_context->serializer->revert (snap);
}
return ret;
}
private:
hb_subset_context_t *subset_context;
OutputArray &out;
const void *base;
Arg &&arg;
};
/*
* Helper to subset an array of offsets. Subsets the thing pointed to by each offset
* and discards the offset in the array if the subset operation results in an empty
* thing.
*/
struct
{
template<typename OutputArray>
subset_offset_array_t<OutputArray>
operator () (hb_subset_context_t *subset_context, OutputArray& out,
const void *base) const
{ return subset_offset_array_t<OutputArray> (subset_context, out, base); }
/* Variant with one extra argument passed to serialize_subset */
template<typename OutputArray, typename Arg>
subset_offset_array_arg_t<OutputArray, Arg>
operator () (hb_subset_context_t *subset_context, OutputArray& out,
const void *base, Arg &&arg) const
{ return subset_offset_array_arg_t<OutputArray, Arg> (subset_context, out, base, arg); }
}
HB_FUNCOBJ (subset_offset_array);
template<typename OutputArray>
struct subset_record_array_t
{
subset_record_array_t (hb_subset_layout_context_t *c_, OutputArray* out_,
const void *base_) : subset_layout_context (c_),
out (out_), base (base_) {}
template <typename T>
void
operator () (T&& record)
{
auto snap = subset_layout_context->subset_context->serializer->snapshot ();
bool ret = record.subset (subset_layout_context, base);
if (!ret) subset_layout_context->subset_context->serializer->revert (snap);
else out->len++;
}
private:
hb_subset_layout_context_t *subset_layout_context;
OutputArray *out;
const void *base;
};
/*
* Helper to subset a RecordList/record array. Subsets each Record in the array and
* discards the record if the subset operation returns false.
*/
struct
{
template<typename OutputArray>
subset_record_array_t<OutputArray>
operator () (hb_subset_layout_context_t *c, OutputArray* out,
const void *base) const
{ return subset_record_array_t<OutputArray> (c, out, base); }
}
HB_FUNCOBJ (subset_record_array);
template<typename OutputArray>
struct serialize_math_record_array_t
{
serialize_math_record_array_t (hb_serialize_context_t *serialize_context_,
OutputArray& out_,
const void *base_) : serialize_context (serialize_context_),
out (out_), base (base_) {}
template <typename T>
bool operator () (T&& record)
{
if (!serialize_context->copy (record, base)) return false;
out.len++;
return true;
}
private:
hb_serialize_context_t *serialize_context;
OutputArray &out;
const void *base;
};
/*
* Helper to serialize an array of MATH records.
*/
struct
{
template<typename OutputArray>
serialize_math_record_array_t<OutputArray>
operator () (hb_serialize_context_t *serialize_context, OutputArray& out,
const void *base) const
{ return serialize_math_record_array_t<OutputArray> (serialize_context, out, base); }
}
HB_FUNCOBJ (serialize_math_record_array);
/*
*
* OpenType Layout Common Table Formats
*
*/
/*
* Script, ScriptList, LangSys, Feature, FeatureList, Lookup, LookupList
*/
struct Record_sanitize_closure_t {
hb_tag_t tag;
const void *list_base;
};
template <typename Type>
struct Record
{
int cmp (hb_tag_t a) const { return tag.cmp (a); }
bool subset (hb_subset_layout_context_t *c, const void *base) const
{
TRACE_SUBSET (this);
auto *out = c->subset_context->serializer->embed (this);
if (unlikely (!out)) return_trace (false);
bool ret = out->offset.serialize_subset (c->subset_context, offset, base, c, &tag);
return_trace (ret);
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
const Record_sanitize_closure_t closure = {tag, base};
return_trace (c->check_struct (this) && offset.sanitize (c, base, &closure));
}
Tag tag; /* 4-byte Tag identifier */
Offset16To<Type>
offset; /* Offset from beginning of object holding
* the Record */
public:
DEFINE_SIZE_STATIC (6);
};
template <typename Type>
struct RecordArrayOf : SortedArray16Of<Record<Type>>
{
const Offset16To<Type>& get_offset (unsigned int i) const
{ return (*this)[i].offset; }
Offset16To<Type>& get_offset (unsigned int i)
{ return (*this)[i].offset; }
const Tag& get_tag (unsigned int i) const
{ return (*this)[i].tag; }
unsigned int get_tags (unsigned int start_offset,
unsigned int *record_count /* IN/OUT */,
hb_tag_t *record_tags /* OUT */) const
{
if (record_count)
{
+ this->sub_array (start_offset, record_count)
| hb_map (&Record<Type>::tag)
| hb_sink (hb_array (record_tags, *record_count))
;
}
return this->len;
}
bool find_index (hb_tag_t tag, unsigned int *index) const
{
return this->bfind (tag, index, HB_NOT_FOUND_STORE, Index::NOT_FOUND_INDEX);
}
};
template <typename Type>
struct RecordListOf : RecordArrayOf<Type>
{
const Type& operator [] (unsigned int i) const
{ return this+this->get_offset (i); }
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!c->serializer->extend_min (out))) return_trace (false);
+ this->iter ()
| hb_apply (subset_record_array (l, out, this))
;
return_trace (true);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (RecordArrayOf<Type>::sanitize (c, this));
}
};
struct Feature;
struct RecordListOfFeature : RecordListOf<Feature>
{
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
unsigned count = this->len;
+ hb_zip (*this, hb_range (count))
| hb_filter (l->feature_index_map, hb_second)
| hb_map (hb_first)
| hb_apply (subset_record_array (l, out, this))
;
return_trace (true);
}
};
struct Script;
struct RecordListOfScript : RecordListOf<Script>
{
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
unsigned count = this->len;
for (auto _ : + hb_zip (*this, hb_range (count)))
{
auto snap = c->serializer->snapshot ();
l->cur_script_index = _.second;
bool ret = _.first.subset (l, this);
if (!ret) c->serializer->revert (snap);
else out->len++;
}
return_trace (true);
}
};
struct RangeRecord
{
int cmp (hb_codepoint_t g) const
{ return g < first ? -1 : g <= last ? 0 : +1; }
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
bool intersects (const hb_set_t *glyphs) const
{ return glyphs->intersects (first, last); }
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{ return glyphs->add_range (first, last); }
HBGlyphID16 first; /* First GlyphID in the range */
HBGlyphID16 last; /* Last GlyphID in the range */
HBUINT16 value; /* Value */
public:
DEFINE_SIZE_STATIC (6);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, RangeRecord);
struct IndexArray : Array16Of<Index>
{
bool intersects (const hb_map_t *indexes) const
{ return hb_any (*this, indexes); }
template <typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
void serialize (hb_serialize_context_t *c,
hb_subset_layout_context_t *l,
Iterator it)
{
if (!it) return;
if (unlikely (!c->extend_min ((*this)))) return;
for (const auto _ : it)
{
if (!l->visitLookupIndex()) break;
Index i;
i = _;
c->copy (i);
this->len++;
}
}
unsigned int get_indexes (unsigned int start_offset,
unsigned int *_count /* IN/OUT */,
unsigned int *_indexes /* OUT */) const
{
if (_count)
{
+ this->sub_array (start_offset, _count)
| hb_sink (hb_array (_indexes, *_count))
;
}
return this->len;
}
void add_indexes_to (hb_set_t* output /* OUT */) const
{
output->add_array (as_array ());
}
};
struct LangSys
{
unsigned int get_feature_count () const
{ return featureIndex.len; }
hb_tag_t get_feature_index (unsigned int i) const
{ return featureIndex[i]; }
unsigned int get_feature_indexes (unsigned int start_offset,
unsigned int *feature_count /* IN/OUT */,
unsigned int *feature_indexes /* OUT */) const
{ return featureIndex.get_indexes (start_offset, feature_count, feature_indexes); }
void add_feature_indexes_to (hb_set_t *feature_indexes) const
{ featureIndex.add_indexes_to (feature_indexes); }
bool has_required_feature () const { return reqFeatureIndex != 0xFFFFu; }
unsigned int get_required_feature_index () const
{
if (reqFeatureIndex == 0xFFFFu)
return Index::NOT_FOUND_INDEX;
return reqFeatureIndex;
}
LangSys* copy (hb_serialize_context_t *c) const
{
TRACE_SERIALIZE (this);
return_trace (c->embed (*this));
}
bool compare (const LangSys& o, const hb_map_t *feature_index_map) const
{
if (reqFeatureIndex != o.reqFeatureIndex)
return false;
auto iter =
+ hb_iter (featureIndex)
| hb_filter (feature_index_map)
| hb_map (feature_index_map)
;
auto o_iter =
+ hb_iter (o.featureIndex)
| hb_filter (feature_index_map)
| hb_map (feature_index_map)
;
for (; iter && o_iter; iter++, o_iter++)
{
unsigned a = *iter;
unsigned b = *o_iter;
if (a != b) return false;
}
if (iter || o_iter) return false;
return true;
}
void collect_features (hb_prune_langsys_context_t *c) const
{
if (!has_required_feature () && !get_feature_count ()) return;
if (has_required_feature () &&
c->duplicate_feature_map->has (reqFeatureIndex))
c->new_feature_indexes->add (get_required_feature_index ());
+ hb_iter (featureIndex)
| hb_filter (c->duplicate_feature_map)
| hb_sink (c->new_feature_indexes)
;
}
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l,
const Tag *tag = nullptr) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
unsigned v;
out->reqFeatureIndex = l->feature_index_map->has (reqFeatureIndex, &v) ? v : 0xFFFFu;
if (!l->visitFeatureIndex (featureIndex.len))
return_trace (false);
auto it =
+ hb_iter (featureIndex)
| hb_filter (l->feature_index_map)
| hb_map (l->feature_index_map)
;
bool ret = bool (it);
out->featureIndex.serialize (c->serializer, l, it);
return_trace (ret);
}
bool sanitize (hb_sanitize_context_t *c,
const Record_sanitize_closure_t * = nullptr) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && featureIndex.sanitize (c));
}
Offset16 lookupOrderZ; /* = Null (reserved for an offset to a
* reordering table) */
HBUINT16 reqFeatureIndex;/* Index of a feature required for this
* language system--if no required features
* = 0xFFFFu */
IndexArray featureIndex; /* Array of indices into the FeatureList */
public:
DEFINE_SIZE_ARRAY_SIZED (6, featureIndex);
};
DECLARE_NULL_NAMESPACE_BYTES (OT, LangSys);
struct Script
{
unsigned int get_lang_sys_count () const
{ return langSys.len; }
const Tag& get_lang_sys_tag (unsigned int i) const
{ return langSys.get_tag (i); }
unsigned int get_lang_sys_tags (unsigned int start_offset,
unsigned int *lang_sys_count /* IN/OUT */,
hb_tag_t *lang_sys_tags /* OUT */) const
{ return langSys.get_tags (start_offset, lang_sys_count, lang_sys_tags); }
const LangSys& get_lang_sys (unsigned int i) const
{
if (i == Index::NOT_FOUND_INDEX) return get_default_lang_sys ();
return this+langSys[i].offset;
}
bool find_lang_sys_index (hb_tag_t tag, unsigned int *index) const
{ return langSys.find_index (tag, index); }
bool has_default_lang_sys () const { return defaultLangSys != 0; }
const LangSys& get_default_lang_sys () const { return this+defaultLangSys; }
void prune_langsys (hb_prune_langsys_context_t *c,
unsigned script_index) const
{
if (!has_default_lang_sys () && !get_lang_sys_count ()) return;
if (!c->visitScript ()) return;
if (!c->script_langsys_map->has (script_index))
{
hb_set_t* empty_set = hb_set_create ();
if (unlikely (!c->script_langsys_map->set (script_index, empty_set)))
{
hb_set_destroy (empty_set);
return;
}
}
unsigned langsys_count = get_lang_sys_count ();
if (has_default_lang_sys ())
{
//only collect features from non-redundant langsys
const LangSys& d = get_default_lang_sys ();
if (c->visitLangsys (d.get_feature_count ())) {
d.collect_features (c);
}
for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
{
const LangSys& l = this+_.first.offset;
if (!c->visitLangsys (l.get_feature_count ())) continue;
if (l.compare (d, c->duplicate_feature_map)) continue;
l.collect_features (c);
c->script_langsys_map->get (script_index)->add (_.second);
}
}
else
{
for (auto _ : + hb_zip (langSys, hb_range (langsys_count)))
{
const LangSys& l = this+_.first.offset;
if (!c->visitLangsys (l.get_feature_count ())) continue;
l.collect_features (c);
c->script_langsys_map->get (script_index)->add (_.second);
}
}
}
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l,
const Tag *tag) const
{
TRACE_SUBSET (this);
if (!l->visitScript ()) return_trace (false);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
bool defaultLang = false;
if (has_default_lang_sys ())
{
c->serializer->push ();
const LangSys& ls = this+defaultLangSys;
bool ret = ls.subset (c, l);
if (!ret && tag && *tag != HB_TAG ('D', 'F', 'L', 'T'))
{
c->serializer->pop_discard ();
out->defaultLangSys = 0;
}
else
{
c->serializer->add_link (out->defaultLangSys, c->serializer->pop_pack ());
defaultLang = true;
}
}
const hb_set_t *active_langsys = l->script_langsys_map->get (l->cur_script_index);
if (active_langsys)
{
unsigned count = langSys.len;
+ hb_zip (langSys, hb_range (count))
| hb_filter (active_langsys, hb_second)
| hb_map (hb_first)
| hb_filter ([=] (const Record<LangSys>& record) {return l->visitLangSys (); })
| hb_apply (subset_record_array (l, &(out->langSys), this))
;
}
return_trace (bool (out->langSys.len) || defaultLang || l->table_tag == HB_OT_TAG_GSUB);
}
bool sanitize (hb_sanitize_context_t *c,
const Record_sanitize_closure_t * = nullptr) const
{
TRACE_SANITIZE (this);
return_trace (defaultLangSys.sanitize (c, this) && langSys.sanitize (c, this));
}
protected:
Offset16To<LangSys>
defaultLangSys; /* Offset to DefaultLangSys table--from
* beginning of Script table--may be Null */
RecordArrayOf<LangSys>
langSys; /* Array of LangSysRecords--listed
* alphabetically by LangSysTag */
public:
DEFINE_SIZE_ARRAY_SIZED (4, langSys);
};
typedef RecordListOfScript ScriptList;
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
struct FeatureParamsSize
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (unlikely (!c->check_struct (this))) return_trace (false);
/* This subtable has some "history", if you will. Some earlier versions of
* Adobe tools calculated the offset of the FeatureParams subtable from the
* beginning of the FeatureList table! Now, that is dealt with in the
* Feature implementation. But we still need to be able to tell junk from
* real data. Note: We don't check that the nameID actually exists.
*
* Read Roberts wrote on 9/15/06 on opentype-list@indx.co.uk :
*
* Yes, it is correct that a new version of the AFDKO (version 2.0) will be
* coming out soon, and that the makeotf program will build a font with a
* 'size' feature that is correct by the specification.
*
* The specification for this feature tag is in the "OpenType Layout Tag
* Registry". You can see a copy of this at:
* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#tag-size
*
* Here is one set of rules to determine if the 'size' feature is built
* correctly, or as by the older versions of MakeOTF. You may be able to do
* better.
*
* Assume that the offset to the size feature is according to specification,
* and make the following value checks. If it fails, assume the size
* feature is calculated as versions of MakeOTF before the AFDKO 2.0 built it.
* If this fails, reject the 'size' feature. The older makeOTF's calculated the
* offset from the beginning of the FeatureList table, rather than from the
* beginning of the 'size' Feature table.
*
* If "design size" == 0:
* fails check
*
* Else if ("subfamily identifier" == 0 and
* "range start" == 0 and
* "range end" == 0 and
* "range start" == 0 and
* "menu name ID" == 0)
* passes check: this is the format used when there is a design size
* specified, but there is no recommended size range.
*
* Else if ("design size" < "range start" or
* "design size" > "range end" or
* "range end" <= "range start" or
* "menu name ID" < 256 or
* "menu name ID" > 32767 or
* menu name ID is not a name ID which is actually in the name table)
* fails test
* Else
* passes test.
*/
if (!designSize)
return_trace (false);
else if (subfamilyID == 0 &&
subfamilyNameID == 0 &&
rangeStart == 0 &&
rangeEnd == 0)
return_trace (true);
else if (designSize < rangeStart ||
designSize > rangeEnd ||
subfamilyNameID < 256 ||
subfamilyNameID > 32767)
return_trace (false);
else
return_trace (true);
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
return_trace ((bool) c->serializer->embed (*this));
}
HBUINT16 designSize; /* Represents the design size in 720/inch
* units (decipoints). The design size entry
* must be non-zero. When there is a design
* size but no recommended size range, the
* rest of the array will consist of zeros. */
HBUINT16 subfamilyID; /* Has no independent meaning, but serves
* as an identifier that associates fonts
* in a subfamily. All fonts which share a
* Preferred or Font Family name and which
* differ only by size range shall have the
* same subfamily value, and no fonts which
* differ in weight or style shall have the
* same subfamily value. If this value is
* zero, the remaining fields in the array
* will be ignored. */
NameID subfamilyNameID;/* If the preceding value is non-zero, this
* value must be set in the range 256 - 32767
* (inclusive). It records the value of a
* field in the name table, which must
* contain English-language strings encoded
* in Windows Unicode and Macintosh Roman,
* and may contain additional strings
* localized to other scripts and languages.
* Each of these strings is the name an
* application should use, in combination
* with the family name, to represent the
* subfamily in a menu. Applications will
* choose the appropriate version based on
* their selection criteria. */
HBUINT16 rangeStart; /* Large end of the recommended usage range
* (inclusive), stored in 720/inch units
* (decipoints). */
HBUINT16 rangeEnd; /* Small end of the recommended usage range
(exclusive), stored in 720/inch units
* (decipoints). */
public:
DEFINE_SIZE_STATIC (10);
};
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#ssxx */
struct FeatureParamsStylisticSet
{
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
/* Right now minorVersion is at zero. Which means, any table supports
* the uiNameID field. */
return_trace (c->check_struct (this));
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
return_trace ((bool) c->serializer->embed (*this));
}
HBUINT16 version; /* (set to 0): This corresponds to a “minor”
* version number. Additional data may be
* added to the end of this Feature Parameters
* table in the future. */
NameID uiNameID; /* The 'name' table name ID that specifies a
* string (or strings, for multiple languages)
* for a user-interface label for this
* feature. The values of uiLabelNameId and
* sampleTextNameId are expected to be in the
* font-specific name ID range (256-32767),
* though that is not a requirement in this
* Feature Parameters specification. The
* user-interface label for the feature can
* be provided in multiple languages. An
* English string should be included as a
* fallback. The string should be kept to a
* minimal length to fit comfortably with
* different application interfaces. */
public:
DEFINE_SIZE_STATIC (4);
};
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_ae#cv01-cv99 */
struct FeatureParamsCharacterVariants
{
unsigned
get_characters (unsigned start_offset, unsigned *char_count, hb_codepoint_t *chars) const
{
if (char_count)
{
+ characters.sub_array (start_offset, char_count)
| hb_sink (hb_array (chars, *char_count))
;
}
return characters.len;
}
unsigned get_size () const
{ return min_size + characters.len * HBUINT24::static_size; }
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
return_trace ((bool) c->serializer->embed (*this));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
characters.sanitize (c));
}
HBUINT16 format; /* Format number is set to 0. */
NameID featUILableNameID; /* The ‘name’ table name ID that
* specifies a string (or strings,
* for multiple languages) for a
* user-interface label for this
* feature. (May be NULL.) */
NameID featUITooltipTextNameID;/* The ‘name’ table name ID that
* specifies a string (or strings,
* for multiple languages) that an
* application can use for tooltip
* text for this feature. (May be
* nullptr.) */
NameID sampleTextNameID; /* The ‘name’ table name ID that
* specifies sample text that
* illustrates the effect of this
* feature. (May be NULL.) */
HBUINT16 numNamedParameters; /* Number of named parameters. (May
* be zero.) */
NameID firstParamUILabelNameID;/* The first ‘name’ table name ID
* used to specify strings for
* user-interface labels for the
* feature parameters. (Must be zero
* if numParameters is zero.) */
Array16Of<HBUINT24>
characters; /* Array of the Unicode Scalar Value
* of the characters for which this
* feature provides glyph variants.
* (May be zero.) */
public:
DEFINE_SIZE_ARRAY (14, characters);
};
struct FeatureParams
{
bool sanitize (hb_sanitize_context_t *c, hb_tag_t tag) const
{
#ifdef HB_NO_LAYOUT_FEATURE_PARAMS
return true;
#endif
TRACE_SANITIZE (this);
if (tag == HB_TAG ('s','i','z','e'))
return_trace (u.size.sanitize (c));
if ((tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
return_trace (u.stylisticSet.sanitize (c));
if ((tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
return_trace (u.characterVariants.sanitize (c));
return_trace (true);
}
bool subset (hb_subset_context_t *c, const Tag* tag) const
{
TRACE_SUBSET (this);
if (!tag) return_trace (false);
if (*tag == HB_TAG ('s','i','z','e'))
return_trace (u.size.subset (c));
if ((*tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
return_trace (u.stylisticSet.subset (c));
if ((*tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
return_trace (u.characterVariants.subset (c));
return_trace (false);
}
#ifndef HB_NO_LAYOUT_FEATURE_PARAMS
const FeatureParamsSize& get_size_params (hb_tag_t tag) const
{
if (tag == HB_TAG ('s','i','z','e'))
return u.size;
return Null (FeatureParamsSize);
}
const FeatureParamsStylisticSet& get_stylistic_set_params (hb_tag_t tag) const
{
if ((tag & 0xFFFF0000u) == HB_TAG ('s','s','\0','\0')) /* ssXX */
return u.stylisticSet;
return Null (FeatureParamsStylisticSet);
}
const FeatureParamsCharacterVariants& get_character_variants_params (hb_tag_t tag) const
{
if ((tag & 0xFFFF0000u) == HB_TAG ('c','v','\0','\0')) /* cvXX */
return u.characterVariants;
return Null (FeatureParamsCharacterVariants);
}
#endif
private:
union {
FeatureParamsSize size;
FeatureParamsStylisticSet stylisticSet;
FeatureParamsCharacterVariants characterVariants;
} u;
public:
DEFINE_SIZE_MIN (0);
};
struct Feature
{
unsigned int get_lookup_count () const
{ return lookupIndex.len; }
hb_tag_t get_lookup_index (unsigned int i) const
{ return lookupIndex[i]; }
unsigned int get_lookup_indexes (unsigned int start_index,
unsigned int *lookup_count /* IN/OUT */,
unsigned int *lookup_tags /* OUT */) const
{ return lookupIndex.get_indexes (start_index, lookup_count, lookup_tags); }
void add_lookup_indexes_to (hb_set_t *lookup_indexes) const
{ lookupIndex.add_indexes_to (lookup_indexes); }
const FeatureParams &get_feature_params () const
{ return this+featureParams; }
bool intersects_lookup_indexes (const hb_map_t *lookup_indexes) const
{ return lookupIndex.intersects (lookup_indexes); }
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l,
const Tag *tag = nullptr) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
out->featureParams.serialize_subset (c, featureParams, this, tag);
auto it =
+ hb_iter (lookupIndex)
| hb_filter (l->lookup_index_map)
| hb_map (l->lookup_index_map)
;
out->lookupIndex.serialize (c->serializer, l, it);
// The decision to keep or drop this feature is already made before we get here
// so always retain it.
return_trace (true);
}
bool sanitize (hb_sanitize_context_t *c,
const Record_sanitize_closure_t *closure = nullptr) const
{
TRACE_SANITIZE (this);
if (unlikely (!(c->check_struct (this) && lookupIndex.sanitize (c))))
return_trace (false);
/* Some earlier versions of Adobe tools calculated the offset of the
* FeatureParams subtable from the beginning of the FeatureList table!
*
* If sanitizing "failed" for the FeatureParams subtable, try it with the
* alternative location. We would know sanitize "failed" if old value
* of the offset was non-zero, but it's zeroed now.
*
* Only do this for the 'size' feature, since at the time of the faulty
* Adobe tools, only the 'size' feature had FeatureParams defined.
*/
if (likely (featureParams.is_null ()))
return_trace (true);
unsigned int orig_offset = featureParams;
if (unlikely (!featureParams.sanitize (c, this, closure ? closure->tag : HB_TAG_NONE)))
return_trace (false);
if (featureParams == 0 && closure &&
closure->tag == HB_TAG ('s','i','z','e') &&
closure->list_base && closure->list_base < this)
{
unsigned int new_offset_int = orig_offset -
(((char *) this) - ((char *) closure->list_base));
Offset16To<FeatureParams> new_offset;
/* Check that it would not overflow. */
new_offset = new_offset_int;
if (new_offset == new_offset_int &&
c->try_set (&featureParams, new_offset_int) &&
!featureParams.sanitize (c, this, closure ? closure->tag : HB_TAG_NONE))
return_trace (false);
}
return_trace (true);
}
Offset16To<FeatureParams>
featureParams; /* Offset to Feature Parameters table (if one
* has been defined for the feature), relative
* to the beginning of the Feature Table; = Null
* if not required */
IndexArray lookupIndex; /* Array of LookupList indices */
public:
DEFINE_SIZE_ARRAY_SIZED (4, lookupIndex);
};
typedef RecordListOf<Feature> FeatureList;
struct LookupFlag : HBUINT16
{
enum Flags {
RightToLeft = 0x0001u,
IgnoreBaseGlyphs = 0x0002u,
IgnoreLigatures = 0x0004u,
IgnoreMarks = 0x0008u,
IgnoreFlags = 0x000Eu,
UseMarkFilteringSet = 0x0010u,
Reserved = 0x00E0u,
MarkAttachmentType = 0xFF00u
};
public:
DEFINE_SIZE_STATIC (2);
};
} /* namespace OT */
/* This has to be outside the namespace. */
HB_MARK_AS_FLAG_T (OT::LookupFlag::Flags);
namespace OT {
struct Lookup
{
unsigned int get_subtable_count () const { return subTable.len; }
template <typename TSubTable>
const Array16OfOffset16To<TSubTable>& get_subtables () const
{ return reinterpret_cast<const Array16OfOffset16To<TSubTable> &> (subTable); }
template <typename TSubTable>
Array16OfOffset16To<TSubTable>& get_subtables ()
{ return reinterpret_cast<Array16OfOffset16To<TSubTable> &> (subTable); }
template <typename TSubTable>
const TSubTable& get_subtable (unsigned int i) const
{ return this+get_subtables<TSubTable> ()[i]; }
template <typename TSubTable>
TSubTable& get_subtable (unsigned int i)
{ return this+get_subtables<TSubTable> ()[i]; }
unsigned int get_size () const
{
const HBUINT16 &markFilteringSet = StructAfter<const HBUINT16> (subTable);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
return (const char *) &StructAfter<const char> (markFilteringSet) - (const char *) this;
return (const char *) &markFilteringSet - (const char *) this;
}
unsigned int get_type () const { return lookupType; }
/* lookup_props is a 32-bit integer where the lower 16-bit is LookupFlag and
* higher 16-bit is mark-filtering-set if the lookup uses one.
* Not to be confused with glyph_props which is very similar. */
uint32_t get_props () const
{
unsigned int flag = lookupFlag;
if (unlikely (flag & LookupFlag::UseMarkFilteringSet))
{
const HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
flag += (markFilteringSet << 16);
}
return flag;
}
template <typename TSubTable, typename context_t, typename ...Ts>
typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
{
unsigned int lookup_type = get_type ();
TRACE_DISPATCH (this, lookup_type);
unsigned int count = get_subtable_count ();
for (unsigned int i = 0; i < count; i++) {
typename context_t::return_t r = get_subtable<TSubTable> (i).dispatch (c, lookup_type, std::forward<Ts> (ds)...);
if (c->stop_sublookup_iteration (r))
return_trace (r);
}
return_trace (c->default_return_value ());
}
bool serialize (hb_serialize_context_t *c,
unsigned int lookup_type,
uint32_t lookup_props,
unsigned int num_subtables)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
lookupType = lookup_type;
lookupFlag = lookup_props & 0xFFFFu;
if (unlikely (!subTable.serialize (c, num_subtables))) return_trace (false);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
{
if (unlikely (!c->extend (this))) return_trace (false);
HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
markFilteringSet = lookup_props >> 16;
}
return_trace (true);
}
template <typename TSubTable>
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
out->lookupType = lookupType;
out->lookupFlag = lookupFlag;
const hb_set_t *glyphset = c->plan->glyphset_gsub ();
unsigned int lookup_type = get_type ();
+ hb_iter (get_subtables <TSubTable> ())
| hb_filter ([this, glyphset, lookup_type] (const Offset16To<TSubTable> &_) { return (this+_).intersects (glyphset, lookup_type); })
| hb_apply (subset_offset_array (c, out->get_subtables<TSubTable> (), this, lookup_type))
;
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
{
if (unlikely (!c->serializer->extend (out))) return_trace (false);
const HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
HBUINT16 &outMarkFilteringSet = StructAfter<HBUINT16> (out->subTable);
outMarkFilteringSet = markFilteringSet;
}
return_trace (out->subTable.len);
}
template <typename TSubTable>
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!(c->check_struct (this) && subTable.sanitize (c))) return_trace (false);
unsigned subtables = get_subtable_count ();
if (unlikely (!c->visit_subtables (subtables))) return_trace (false);
if (lookupFlag & LookupFlag::UseMarkFilteringSet)
{
const HBUINT16 &markFilteringSet = StructAfter<HBUINT16> (subTable);
if (!markFilteringSet.sanitize (c)) return_trace (false);
}
if (unlikely (!get_subtables<TSubTable> ().sanitize (c, this, get_type ())))
return_trace (false);
if (unlikely (get_type () == TSubTable::Extension && subtables && !c->get_edit_count ()))
{
/* The spec says all subtables of an Extension lookup should
* have the same type, which shall not be the Extension type
* itself (but we already checked for that).
* This is specially important if one has a reverse type!
*
* We only do this if sanitizer edit_count is zero. Otherwise,
* some of the subtables might have become insane after they
* were sanity-checked by the edits of subsequent subtables.
* https://bugs.chromium.org/p/chromium/issues/detail?id=960331
*/
unsigned int type = get_subtable<TSubTable> (0).u.extension.get_type ();
for (unsigned int i = 1; i < subtables; i++)
if (get_subtable<TSubTable> (i).u.extension.get_type () != type)
return_trace (false);
}
return_trace (true);
}
private:
HBUINT16 lookupType; /* Different enumerations for GSUB and GPOS */
HBUINT16 lookupFlag; /* Lookup qualifiers */
Array16Of<Offset16>
subTable; /* Array of SubTables */
/*HBUINT16 markFilteringSetX[HB_VAR_ARRAY];*//* Index (base 0) into GDEF mark glyph sets
* structure. This field is only present if bit
* UseMarkFilteringSet of lookup flags is set. */
public:
DEFINE_SIZE_ARRAY (6, subTable);
};
typedef List16OfOffset16To<Lookup> LookupList;
template <typename TLookup>
struct LookupOffsetList : List16OfOffset16To<TLookup>
{
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
unsigned count = this->len;
+ hb_zip (*this, hb_range (count))
| hb_filter (l->lookup_index_map, hb_second)
| hb_map (hb_first)
| hb_apply (subset_offset_array (c, *out, this))
;
return_trace (true);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (List16OfOffset16To<TLookup>::sanitize (c, this));
}
};
/*
* Coverage Table
*/
struct CoverageFormat1
{
friend struct Coverage;
private:
unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
unsigned int i;
glyphArray.bfind (glyph_id, &i, HB_NOT_FOUND_STORE, NOT_COVERED);
return i;
}
template <typename Iterator,
hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
bool serialize (hb_serialize_context_t *c, Iterator glyphs)
{
TRACE_SERIALIZE (this);
return_trace (glyphArray.serialize (c, glyphs));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (glyphArray.sanitize (c));
}
bool intersects (const hb_set_t *glyphs) const
{
/* TODO Speed up, using hb_set_next() and bsearch()? */
for (const auto& g : glyphArray.as_array ())
if (glyphs->has (g))
return true;
return false;
}
bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
{ return glyphs->has (glyphArray[index]); }
void intersected_coverage_glyphs (const hb_set_t *glyphs, hb_set_t *intersect_glyphs) const
{
unsigned count = glyphArray.len;
for (unsigned i = 0; i < count; i++)
if (glyphs->has (glyphArray[i]))
intersect_glyphs->add (glyphArray[i]);
}
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{ return glyphs->add_sorted_array (glyphArray.as_array ()); }
public:
/* Older compilers need this to be public. */
struct iter_t
{
void init (const struct CoverageFormat1 &c_) { c = &c_; i = 0; }
void fini () {}
bool more () const { return i < c->glyphArray.len; }
void next () { i++; }
hb_codepoint_t get_glyph () const { return c->glyphArray[i]; }
bool operator != (const iter_t& o) const
{ return i != o.i; }
iter_t __end__ () const { iter_t it; it.init (*c); it.i = c->glyphArray.len; return it; }
private:
const struct CoverageFormat1 *c;
unsigned int i;
};
private:
protected:
HBUINT16 coverageFormat; /* Format identifier--format = 1 */
SortedArray16Of<HBGlyphID16>
glyphArray; /* Array of GlyphIDs--in numerical order */
public:
DEFINE_SIZE_ARRAY (4, glyphArray);
};
struct CoverageFormat2
{
friend struct Coverage;
private:
unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
const RangeRecord &range = rangeRecord.bsearch (glyph_id);
return likely (range.first <= range.last)
? (unsigned int) range.value + (glyph_id - range.first)
: NOT_COVERED;
}
template <typename Iterator,
hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
bool serialize (hb_serialize_context_t *c, Iterator glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
/* TODO(iter) Write more efficiently? */
unsigned num_ranges = 0;
hb_codepoint_t last = (hb_codepoint_t) -2;
for (auto g: glyphs)
{
if (last + 1 != g)
num_ranges++;
last = g;
}
if (unlikely (!rangeRecord.serialize (c, num_ranges))) return_trace (false);
if (!num_ranges) return_trace (true);
unsigned count = 0;
unsigned range = (unsigned) -1;
last = (hb_codepoint_t) -2;
for (auto g: glyphs)
{
if (last + 1 != g)
{
range++;
rangeRecord[range].first = g;
rangeRecord[range].value = count;
}
rangeRecord[range].last = g;
last = g;
count++;
}
return_trace (true);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (rangeRecord.sanitize (c));
}
bool intersects (const hb_set_t *glyphs) const
{
return hb_any (+ hb_iter (rangeRecord.as_array ())
| hb_map ([glyphs] (const RangeRecord &range) { return range.intersects (glyphs); }));
}
bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
{
auto cmp = [] (const void *pk, const void *pr) -> int
{
unsigned index = * (const unsigned *) pk;
const RangeRecord &range = * (const RangeRecord *) pr;
if (index < range.value) return -1;
if (index > (unsigned int) range.value + (range.last - range.first)) return +1;
return 0;
};
auto arr = rangeRecord.as_array ();
unsigned idx;
if (hb_bsearch_impl (&idx, index,
arr.arrayZ, arr.length, sizeof (arr[0]),
(int (*)(const void *_key, const void *_item)) cmp))
return arr.arrayZ[idx].intersects (glyphs);
return false;
}
void intersected_coverage_glyphs (const hb_set_t *glyphs, hb_set_t *intersect_glyphs) const
{
for (const auto& range : rangeRecord.as_array ())
{
if (!range.intersects (glyphs)) continue;
unsigned last = range.last;
for (hb_codepoint_t g = range.first - 1;
glyphs->next (&g) && g <= last;)
intersect_glyphs->add (g);
}
}
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
if (unlikely (!rangeRecord[i].collect_coverage (glyphs)))
return false;
return true;
}
public:
/* Older compilers need this to be public. */
struct iter_t
{
void init (const CoverageFormat2 &c_)
{
c = &c_;
coverage = 0;
i = 0;
j = c->rangeRecord.len ? c->rangeRecord[0].first : 0;
if (unlikely (c->rangeRecord[0].first > c->rangeRecord[0].last))
{
/* Broken table. Skip. */
i = c->rangeRecord.len;
}
}
void fini () {}
bool more () const { return i < c->rangeRecord.len; }
void next ()
{
if (j >= c->rangeRecord[i].last)
{
i++;
if (more ())
{
unsigned int old = coverage;
j = c->rangeRecord[i].first;
coverage = c->rangeRecord[i].value;
if (unlikely (coverage != old + 1))
{
/* Broken table. Skip. Important to avoid DoS.
* Also, our callers depend on coverage being
* consecutive and monotonically increasing,
* ie. iota(). */
i = c->rangeRecord.len;
return;
}
}
else
j = 0;
return;
}
coverage++;
j++;
}
hb_codepoint_t get_glyph () const { return j; }
bool operator != (const iter_t& o) const
{ return i != o.i || j != o.j; }
iter_t __end__ () const
{
iter_t it;
it.init (*c);
it.i = c->rangeRecord.len;
it.j = 0;
return it;
}
private:
const struct CoverageFormat2 *c;
unsigned int i, coverage;
hb_codepoint_t j;
};
private:
protected:
HBUINT16 coverageFormat; /* Format identifier--format = 2 */
SortedArray16Of<RangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID. rangeCount entries
* long */
public:
DEFINE_SIZE_ARRAY (4, rangeRecord);
};
struct Coverage
{
/* Has interface. */
static constexpr unsigned SENTINEL = NOT_COVERED;
typedef unsigned int value_t;
value_t operator [] (hb_codepoint_t k) const { return get (k); }
bool has (hb_codepoint_t k) const { return (*this)[k] != SENTINEL; }
/* Predicate. */
bool operator () (hb_codepoint_t k) const { return has (k); }
unsigned int get (hb_codepoint_t k) const { return get_coverage (k); }
unsigned int get_coverage (hb_codepoint_t glyph_id) const
{
switch (u.format) {
case 1: return u.format1.get_coverage (glyph_id);
case 2: return u.format2.get_coverage (glyph_id);
default:return NOT_COVERED;
}
}
template <typename Iterator,
hb_requires (hb_is_sorted_source_of (Iterator, hb_codepoint_t))>
bool serialize (hb_serialize_context_t *c, Iterator glyphs)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
unsigned count = 0;
unsigned num_ranges = 0;
hb_codepoint_t last = (hb_codepoint_t) -2;
for (auto g: glyphs)
{
if (last + 1 != g)
num_ranges++;
last = g;
count++;
}
u.format = count <= num_ranges * 3 ? 1 : 2;
switch (u.format)
{
case 1: return_trace (u.format1.serialize (c, glyphs));
case 2: return_trace (u.format2.serialize (c, glyphs));
default:return_trace (false);
}
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
auto it =
+ iter ()
| hb_filter (c->plan->glyph_map_gsub)
| hb_map_retains_sorting (c->plan->glyph_map_gsub)
;
// Cache the iterator result as it will be iterated multiple times
// by the serialize code below.
hb_sorted_vector_t<hb_codepoint_t> glyphs (it);
Coverage_serialize (c->serializer, glyphs.iter ());
return_trace (bool (glyphs));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format)
{
case 1: return_trace (u.format1.sanitize (c));
case 2: return_trace (u.format2.sanitize (c));
default:return_trace (true);
}
}
bool intersects (const hb_set_t *glyphs) const
{
switch (u.format)
{
case 1: return u.format1.intersects (glyphs);
case 2: return u.format2.intersects (glyphs);
default:return false;
}
}
bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
{
switch (u.format)
{
case 1: return u.format1.intersects_coverage (glyphs, index);
case 2: return u.format2.intersects_coverage (glyphs, index);
default:return false;
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{
switch (u.format)
{
case 1: return u.format1.collect_coverage (glyphs);
case 2: return u.format2.collect_coverage (glyphs);
default:return false;
}
}
void intersected_coverage_glyphs (const hb_set_t *glyphs, hb_set_t *intersect_glyphs) const
{
switch (u.format)
{
case 1: return u.format1.intersected_coverage_glyphs (glyphs, intersect_glyphs);
case 2: return u.format2.intersected_coverage_glyphs (glyphs, intersect_glyphs);
default:return ;
}
}
struct iter_t : hb_iter_with_fallback_t<iter_t, hb_codepoint_t>
{
static constexpr bool is_sorted_iterator = true;
iter_t (const Coverage &c_ = Null (Coverage))
{
memset (this, 0, sizeof (*this));
format = c_.u.format;
switch (format)
{
case 1: u.format1.init (c_.u.format1); return;
case 2: u.format2.init (c_.u.format2); return;
default: return;
}
}
bool __more__ () const
{
switch (format)
{
case 1: return u.format1.more ();
case 2: return u.format2.more ();
default:return false;
}
}
void __next__ ()
{
switch (format)
{
case 1: u.format1.next (); break;
case 2: u.format2.next (); break;
default: break;
}
}
typedef hb_codepoint_t __item_t__;
__item_t__ __item__ () const { return get_glyph (); }
hb_codepoint_t get_glyph () const
{
switch (format)
{
case 1: return u.format1.get_glyph ();
case 2: return u.format2.get_glyph ();
default:return 0;
}
}
bool operator != (const iter_t& o) const
{
if (unlikely (format != o.format)) return true;
switch (format)
{
case 1: return u.format1 != o.u.format1;
case 2: return u.format2 != o.u.format2;
default:return false;
}
}
iter_t __end__ () const
{
iter_t it = {};
it.format = format;
switch (format)
{
case 1: it.u.format1 = u.format1.__end__ (); break;
case 2: it.u.format2 = u.format2.__end__ (); break;
default: break;
}
return it;
}
private:
unsigned int format;
union {
CoverageFormat2::iter_t format2; /* Put this one first since it's larger; helps shut up compiler. */
CoverageFormat1::iter_t format1;
} u;
};
iter_t iter () const { return iter_t (*this); }
protected:
union {
HBUINT16 format; /* Format identifier */
CoverageFormat1 format1;
CoverageFormat2 format2;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
template<typename Iterator>
static inline void
Coverage_serialize (hb_serialize_context_t *c,
Iterator it)
{ c->start_embed<Coverage> ()->serialize (c, it); }
static void ClassDef_remap_and_serialize (hb_serialize_context_t *c,
const hb_set_t &klasses,
bool use_class_zero,
hb_sorted_vector_t<hb_pair_t<hb_codepoint_t, hb_codepoint_t>> &glyph_and_klass, /* IN/OUT */
hb_map_t *klass_map /*IN/OUT*/)
{
if (!klass_map)
{
ClassDef_serialize (c, glyph_and_klass.iter ());
return;
}
/* any glyph not assigned a class value falls into Class zero (0),
* if any glyph assigned to class 0, remapping must start with 0->0*/
if (!use_class_zero)
klass_map->set (0, 0);
unsigned idx = klass_map->has (0) ? 1 : 0;
for (const unsigned k: klasses.iter ())
{
if (klass_map->has (k)) continue;
klass_map->set (k, idx);
idx++;
}
for (unsigned i = 0; i < glyph_and_klass.length; i++)
{
hb_codepoint_t klass = glyph_and_klass[i].second;
glyph_and_klass[i].second = klass_map->get (klass);
}
c->propagate_error (glyph_and_klass, klasses);
ClassDef_serialize (c, glyph_and_klass.iter ());
}
/*
* Class Definition Table
*/
struct ClassDefFormat1
{
friend struct ClassDef;
private:
unsigned int get_class (hb_codepoint_t glyph_id) const
{
return classValue[(unsigned int) (glyph_id - startGlyph)];
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool serialize (hb_serialize_context_t *c,
Iterator it)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
if (unlikely (!it))
{
classFormat = 1;
startGlyph = 0;
classValue.len = 0;
return_trace (true);
}
hb_codepoint_t glyph_min = (*it).first;
hb_codepoint_t glyph_max = + it
| hb_map (hb_first)
| hb_reduce (hb_max, 0u);
unsigned glyph_count = glyph_max - glyph_min + 1;
startGlyph = glyph_min;
if (unlikely (!classValue.serialize (c, glyph_count))) return_trace (false);
for (const hb_pair_t<hb_codepoint_t, unsigned> gid_klass_pair : + it)
{
unsigned idx = gid_klass_pair.first - glyph_min;
classValue[idx] = gid_klass_pair.second;
}
return_trace (true);
}
bool subset (hb_subset_context_t *c,
hb_map_t *klass_map = nullptr /*OUT*/,
bool keep_empty_table = true,
bool use_class_zero = true,
const Coverage* glyph_filter = nullptr) const
{
TRACE_SUBSET (this);
const hb_map_t &glyph_map = *c->plan->glyph_map_gsub;
hb_sorted_vector_t<hb_pair_t<hb_codepoint_t, hb_codepoint_t>> glyph_and_klass;
hb_set_t orig_klasses;
hb_codepoint_t start = startGlyph;
hb_codepoint_t end = start + classValue.len;
for (const hb_codepoint_t gid : + hb_range (start, end))
{
hb_codepoint_t new_gid = glyph_map[gid];
if (new_gid == HB_MAP_VALUE_INVALID) continue;
if (glyph_filter && !glyph_filter->has(gid)) continue;
unsigned klass = classValue[gid - start];
if (!klass) continue;
glyph_and_klass.push (hb_pair (new_gid, klass));
orig_klasses.add (klass);
}
unsigned glyph_count = glyph_filter
? hb_len (hb_iter (glyph_map.keys()) | hb_filter (glyph_filter))
: glyph_map.get_population ();
use_class_zero = use_class_zero && glyph_count <= glyph_and_klass.length;
ClassDef_remap_and_serialize (c->serializer,
orig_klasses,
use_class_zero,
glyph_and_klass,
klass_map);
return_trace (keep_empty_table || (bool) glyph_and_klass);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && classValue.sanitize (c));
}
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{
unsigned int start = 0;
unsigned int count = classValue.len;
for (unsigned int i = 0; i < count; i++)
{
if (classValue[i])
continue;
if (start != i)
if (unlikely (!glyphs->add_range (startGlyph + start, startGlyph + i)))
return false;
start = i + 1;
}
if (start != count)
if (unlikely (!glyphs->add_range (startGlyph + start, startGlyph + count)))
return false;
return true;
}
template <typename set_t>
bool collect_class (set_t *glyphs, unsigned klass) const
{
unsigned int count = classValue.len;
for (unsigned int i = 0; i < count; i++)
if (classValue[i] == klass) glyphs->add (startGlyph + i);
return true;
}
bool intersects (const hb_set_t *glyphs) const
{
/* TODO Speed up, using hb_set_next()? */
hb_codepoint_t start = startGlyph;
hb_codepoint_t end = startGlyph + classValue.len;
for (hb_codepoint_t iter = startGlyph - 1;
hb_set_next (glyphs, &iter) && iter < end;)
if (classValue[iter - start]) return true;
return false;
}
bool intersects_class (const hb_set_t *glyphs, uint16_t klass) const
{
unsigned int count = classValue.len;
if (klass == 0)
{
/* Match if there's any glyph that is not listed! */
hb_codepoint_t g = HB_SET_VALUE_INVALID;
if (!hb_set_next (glyphs, &g)) return false;
if (g < startGlyph) return true;
g = startGlyph + count - 1;
if (hb_set_next (glyphs, &g)) return true;
/* Fall through. */
}
/* TODO Speed up, using set overlap first? */
/* TODO(iter) Rewrite as dagger. */
const HBUINT16 *arr = classValue.arrayZ;
for (unsigned int i = 0; i < count; i++)
if (arr[i] == klass && glyphs->has (startGlyph + i))
return true;
return false;
}
void intersected_class_glyphs (const hb_set_t *glyphs, unsigned klass, hb_set_t *intersect_glyphs) const
{
unsigned count = classValue.len;
if (klass == 0)
{
unsigned start_glyph = startGlyph;
for (unsigned g = HB_SET_VALUE_INVALID;
hb_set_next (glyphs, &g) && g < start_glyph;)
intersect_glyphs->add (g);
for (unsigned g = startGlyph + count - 1;
hb_set_next (glyphs, &g);)
intersect_glyphs->add (g);
return;
}
for (unsigned i = 0; i < count; i++)
if (classValue[i] == klass && glyphs->has (startGlyph + i))
intersect_glyphs->add (startGlyph + i);
#if 0
/* The following implementation is faster asymptotically, but slower
* in practice. */
unsigned start_glyph = startGlyph;
unsigned end_glyph = start_glyph + count;
for (unsigned g = startGlyph - 1;
hb_set_next (glyphs, &g) && g < end_glyph;)
if (classValue.arrayZ[g - start_glyph] == klass)
intersect_glyphs->add (g);
#endif
}
void intersected_classes (const hb_set_t *glyphs, hb_set_t *intersect_classes) const
{
if (glyphs->is_empty ()) return;
hb_codepoint_t end_glyph = startGlyph + classValue.len - 1;
if (glyphs->get_min () < startGlyph ||
glyphs->get_max () > end_glyph)
intersect_classes->add (0);
for (const auto& _ : + hb_enumerate (classValue))
{
hb_codepoint_t g = startGlyph + _.first;
if (glyphs->has (g))
intersect_classes->add (_.second);
}
}
protected:
HBUINT16 classFormat; /* Format identifier--format = 1 */
HBGlyphID16 startGlyph; /* First GlyphID of the classValueArray */
Array16Of<HBUINT16>
classValue; /* Array of Class Values--one per GlyphID */
public:
DEFINE_SIZE_ARRAY (6, classValue);
};
struct ClassDefFormat2
{
friend struct ClassDef;
private:
unsigned int get_class (hb_codepoint_t glyph_id) const
{
return rangeRecord.bsearch (glyph_id).value;
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool serialize (hb_serialize_context_t *c,
Iterator it)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
if (unlikely (!it))
{
classFormat = 2;
rangeRecord.len = 0;
return_trace (true);
}
unsigned num_ranges = 1;
hb_codepoint_t prev_gid = (*it).first;
unsigned prev_klass = (*it).second;
RangeRecord range_rec;
range_rec.first = prev_gid;
range_rec.last = prev_gid;
range_rec.value = prev_klass;
RangeRecord *record = c->copy (range_rec);
if (unlikely (!record)) return_trace (false);
for (const auto gid_klass_pair : + (++it))
{
hb_codepoint_t cur_gid = gid_klass_pair.first;
unsigned cur_klass = gid_klass_pair.second;
if (cur_gid != prev_gid + 1 ||
cur_klass != prev_klass)
{
if (unlikely (!record)) break;
record->last = prev_gid;
num_ranges++;
range_rec.first = cur_gid;
range_rec.last = cur_gid;
range_rec.value = cur_klass;
record = c->copy (range_rec);
}
prev_klass = cur_klass;
prev_gid = cur_gid;
}
if (likely (record)) record->last = prev_gid;
rangeRecord.len = num_ranges;
return_trace (true);
}
bool subset (hb_subset_context_t *c,
hb_map_t *klass_map = nullptr /*OUT*/,
bool keep_empty_table = true,
bool use_class_zero = true,
const Coverage* glyph_filter = nullptr) const
{
TRACE_SUBSET (this);
const hb_map_t &glyph_map = *c->plan->glyph_map_gsub;
hb_sorted_vector_t<hb_pair_t<hb_codepoint_t, hb_codepoint_t>> glyph_and_klass;
hb_set_t orig_klasses;
unsigned count = rangeRecord.len;
for (unsigned i = 0; i < count; i++)
{
unsigned klass = rangeRecord[i].value;
if (!klass) continue;
hb_codepoint_t start = rangeRecord[i].first;
hb_codepoint_t end = rangeRecord[i].last + 1;
for (hb_codepoint_t g = start; g < end; g++)
{
hb_codepoint_t new_gid = glyph_map[g];
if (new_gid == HB_MAP_VALUE_INVALID) continue;
if (glyph_filter && !glyph_filter->has (g)) continue;
glyph_and_klass.push (hb_pair (new_gid, klass));
orig_klasses.add (klass);
}
}
const hb_set_t& glyphset = *c->plan->glyphset_gsub ();
unsigned glyph_count = glyph_filter
? hb_len (hb_iter (glyphset) | hb_filter (glyph_filter))
: glyph_map.get_population ();
use_class_zero = use_class_zero && glyph_count <= glyph_and_klass.length;
ClassDef_remap_and_serialize (c->serializer,
orig_klasses,
use_class_zero,
glyph_and_klass,
klass_map);
return_trace (keep_empty_table || (bool) glyph_and_klass);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (rangeRecord.sanitize (c));
}
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
if (rangeRecord[i].value)
if (unlikely (!rangeRecord[i].collect_coverage (glyphs)))
return false;
return true;
}
template <typename set_t>
bool collect_class (set_t *glyphs, unsigned int klass) const
{
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
{
if (rangeRecord[i].value == klass)
if (unlikely (!rangeRecord[i].collect_coverage (glyphs)))
return false;
}
return true;
}
bool intersects (const hb_set_t *glyphs) const
{
/* TODO Speed up, using hb_set_next() and bsearch()? */
unsigned int count = rangeRecord.len;
for (unsigned int i = 0; i < count; i++)
{
const auto& range = rangeRecord[i];
if (range.intersects (glyphs) && range.value)
return true;
}
return false;
}
bool intersects_class (const hb_set_t *glyphs, uint16_t klass) const
{
unsigned int count = rangeRecord.len;
if (klass == 0)
{
/* Match if there's any glyph that is not listed! */
hb_codepoint_t g = HB_SET_VALUE_INVALID;
for (unsigned int i = 0; i < count; i++)
{
if (!hb_set_next (glyphs, &g))
break;
if (g < rangeRecord[i].first)
return true;
g = rangeRecord[i].last;
}
if (g != HB_SET_VALUE_INVALID && hb_set_next (glyphs, &g))
return true;
/* Fall through. */
}
/* TODO Speed up, using set overlap first? */
/* TODO(iter) Rewrite as dagger. */
const RangeRecord *arr = rangeRecord.arrayZ;
for (unsigned int i = 0; i < count; i++)
if (arr[i].value == klass && arr[i].intersects (glyphs))
return true;
return false;
}
void intersected_class_glyphs (const hb_set_t *glyphs, unsigned klass, hb_set_t *intersect_glyphs) const
{
unsigned count = rangeRecord.len;
if (klass == 0)
{
hb_codepoint_t g = HB_SET_VALUE_INVALID;
for (unsigned int i = 0; i < count; i++)
{
if (!hb_set_next (glyphs, &g))
goto done;
while (g < rangeRecord[i].first)
{
intersect_glyphs->add (g);
if (!hb_set_next (glyphs, &g))
goto done;
}
g = rangeRecord[i].last;
}
while (hb_set_next (glyphs, &g))
intersect_glyphs->add (g);
done:
return;
}
#if 0
/* The following implementation is faster asymptotically, but slower
* in practice. */
if ((count >> 3) > glyphs->get_population ())
{
for (hb_codepoint_t g = HB_SET_VALUE_INVALID;
hb_set_next (glyphs, &g);)
if (rangeRecord.as_array ().bfind (g))
intersect_glyphs->add (g);
return;
}
#endif
for (unsigned int i = 0; i < count; i++)
{
if (rangeRecord[i].value != klass) continue;
unsigned end = rangeRecord[i].last + 1;
for (hb_codepoint_t g = rangeRecord[i].first - 1;
hb_set_next (glyphs, &g) && g < end;)
intersect_glyphs->add (g);
}
}
void intersected_classes (const hb_set_t *glyphs, hb_set_t *intersect_classes) const
{
if (glyphs->is_empty ()) return;
unsigned count = rangeRecord.len;
hb_codepoint_t g = HB_SET_VALUE_INVALID;
for (unsigned int i = 0; i < count; i++)
{
if (!hb_set_next (glyphs, &g))
break;
if (g < rangeRecord[i].first)
{
intersect_classes->add (0);
break;
}
g = rangeRecord[i].last;
}
if (g != HB_SET_VALUE_INVALID && hb_set_next (glyphs, &g))
intersect_classes->add (0);
for (const RangeRecord& record : rangeRecord.iter ())
if (record.intersects (glyphs))
intersect_classes->add (record.value);
}
protected:
HBUINT16 classFormat; /* Format identifier--format = 2 */
SortedArray16Of<RangeRecord>
rangeRecord; /* Array of glyph ranges--ordered by
* Start GlyphID */
public:
DEFINE_SIZE_ARRAY (4, rangeRecord);
};
struct ClassDef
{
/* Has interface. */
static constexpr unsigned SENTINEL = 0;
typedef unsigned int value_t;
value_t operator [] (hb_codepoint_t k) const { return get (k); }
bool has (hb_codepoint_t k) const { return (*this)[k] != SENTINEL; }
/* Projection. */
hb_codepoint_t operator () (hb_codepoint_t k) const { return get (k); }
unsigned int get (hb_codepoint_t k) const { return get_class (k); }
unsigned int get_class (hb_codepoint_t glyph_id) const
{
switch (u.format) {
case 1: return u.format1.get_class (glyph_id);
case 2: return u.format2.get_class (glyph_id);
default:return 0;
}
}
template<typename Iterator,
hb_requires (hb_is_iterator (Iterator))>
bool serialize (hb_serialize_context_t *c, Iterator it_with_class_zero)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
auto it = + it_with_class_zero | hb_filter (hb_second);
unsigned format = 2;
if (likely (it))
{
hb_codepoint_t glyph_min = (*it).first;
hb_codepoint_t glyph_max = glyph_min;
unsigned num_glyphs = 0;
unsigned num_ranges = 1;
hb_codepoint_t prev_gid = glyph_min;
unsigned prev_klass = (*it).second;
for (const auto gid_klass_pair : it)
{
hb_codepoint_t cur_gid = gid_klass_pair.first;
unsigned cur_klass = gid_klass_pair.second;
num_glyphs++;
if (cur_gid == glyph_min) continue;
if (cur_gid > glyph_max) glyph_max = cur_gid;
if (cur_gid != prev_gid + 1 ||
cur_klass != prev_klass)
num_ranges++;
prev_gid = cur_gid;
prev_klass = cur_klass;
}
if (num_glyphs && 1 + (glyph_max - glyph_min + 1) <= num_ranges * 3)
format = 1;
}
u.format = format;
switch (u.format)
{
case 1: return_trace (u.format1.serialize (c, it));
case 2: return_trace (u.format2.serialize (c, it));
default:return_trace (false);
}
}
bool subset (hb_subset_context_t *c,
hb_map_t *klass_map = nullptr /*OUT*/,
bool keep_empty_table = true,
bool use_class_zero = true,
const Coverage* glyph_filter = nullptr) const
{
TRACE_SUBSET (this);
switch (u.format) {
case 1: return_trace (u.format1.subset (c, klass_map, keep_empty_table, use_class_zero, glyph_filter));
case 2: return_trace (u.format2.subset (c, klass_map, keep_empty_table, use_class_zero, glyph_filter));
default:return_trace (false);
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 1: return_trace (u.format1.sanitize (c));
case 2: return_trace (u.format2.sanitize (c));
default:return_trace (true);
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
bool collect_coverage (set_t *glyphs) const
{
switch (u.format) {
case 1: return u.format1.collect_coverage (glyphs);
case 2: return u.format2.collect_coverage (glyphs);
default:return false;
}
}
/* Might return false if array looks unsorted.
* Used for faster rejection of corrupt data. */
template <typename set_t>
bool collect_class (set_t *glyphs, unsigned int klass) const
{
switch (u.format) {
case 1: return u.format1.collect_class (glyphs, klass);
case 2: return u.format2.collect_class (glyphs, klass);
default:return false;
}
}
bool intersects (const hb_set_t *glyphs) const
{
switch (u.format) {
case 1: return u.format1.intersects (glyphs);
case 2: return u.format2.intersects (glyphs);
default:return false;
}
}
bool intersects_class (const hb_set_t *glyphs, unsigned int klass) const
{
switch (u.format) {
case 1: return u.format1.intersects_class (glyphs, klass);
case 2: return u.format2.intersects_class (glyphs, klass);
default:return false;
}
}
void intersected_class_glyphs (const hb_set_t *glyphs, unsigned klass, hb_set_t *intersect_glyphs) const
{
switch (u.format) {
case 1: return u.format1.intersected_class_glyphs (glyphs, klass, intersect_glyphs);
case 2: return u.format2.intersected_class_glyphs (glyphs, klass, intersect_glyphs);
default:return;
}
}
void intersected_classes (const hb_set_t *glyphs, hb_set_t *intersect_classes) const
{
switch (u.format) {
case 1: return u.format1.intersected_classes (glyphs, intersect_classes);
case 2: return u.format2.intersected_classes (glyphs, intersect_classes);
default:return;
}
}
protected:
union {
HBUINT16 format; /* Format identifier */
ClassDefFormat1 format1;
ClassDefFormat2 format2;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
template<typename Iterator>
static inline void ClassDef_serialize (hb_serialize_context_t *c,
Iterator it)
{ c->start_embed<ClassDef> ()->serialize (c, it); }
/*
* Item Variation Store
*/
struct VarRegionAxis
{
float evaluate (int coord) const
{
int start = startCoord, peak = peakCoord, end = endCoord;
/* TODO Move these to sanitize(). */
if (unlikely (start > peak || peak > end))
return 1.;
if (unlikely (start < 0 && end > 0 && peak != 0))
return 1.;
if (peak == 0 || coord == peak)
return 1.;
if (coord <= start || end <= coord)
return 0.;
/* Interpolate */
if (coord < peak)
return float (coord - start) / (peak - start);
else
return float (end - coord) / (end - peak);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
/* TODO Handle invalid start/peak/end configs, so we don't
* have to do that at runtime. */
}
public:
F2DOT14 startCoord;
F2DOT14 peakCoord;
F2DOT14 endCoord;
public:
DEFINE_SIZE_STATIC (6);
};
#define REGION_CACHE_ITEM_CACHE_INVALID 2.f
struct VarRegionList
{
using cache_t = float;
float evaluate (unsigned int region_index,
const int *coords, unsigned int coord_len,
cache_t *cache = nullptr) const
{
if (unlikely (region_index >= regionCount))
return 0.;
float *cached_value = nullptr;
if (cache)
{
cached_value = &(cache[region_index]);
if (likely (*cached_value != REGION_CACHE_ITEM_CACHE_INVALID))
return *cached_value;
}
const VarRegionAxis *axes = axesZ.arrayZ + (region_index * axisCount);
float v = 1.;
unsigned int count = axisCount;
for (unsigned int i = 0; i < count; i++)
{
int coord = i < coord_len ? coords[i] : 0;
float factor = axes[i].evaluate (coord);
if (factor == 0.f)
{
if (cache)
*cached_value = 0.;
return 0.;
}
v *= factor;
}
if (cache)
*cached_value = v;
return v;
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && axesZ.sanitize (c, axisCount * regionCount));
}
bool serialize (hb_serialize_context_t *c, const VarRegionList *src, const hb_bimap_t &region_map)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
axisCount = src->axisCount;
regionCount = region_map.get_population ();
if (unlikely (hb_unsigned_mul_overflows (axisCount * regionCount,
VarRegionAxis::static_size))) return_trace (false);
if (unlikely (!c->extend (this))) return_trace (false);
unsigned int region_count = src->regionCount;
for (unsigned int r = 0; r < regionCount; r++)
{
unsigned int backward = region_map.backward (r);
if (backward >= region_count) return_trace (false);
memcpy (&axesZ[axisCount * r], &src->axesZ[axisCount * backward], VarRegionAxis::static_size * axisCount);
}
return_trace (true);
}
unsigned int get_size () const { return min_size + VarRegionAxis::static_size * axisCount * regionCount; }
public:
HBUINT16 axisCount;
HBUINT15 regionCount;
protected:
UnsizedArrayOf<VarRegionAxis>
axesZ;
public:
DEFINE_SIZE_ARRAY (4, axesZ);
};
struct VarData
{
unsigned int get_region_index_count () const
{ return regionIndices.len; }
unsigned int get_row_size () const
{ return (wordCount () + regionIndices.len) * (longWords () ? 2 : 1); }
unsigned int get_size () const
{ return min_size
- regionIndices.min_size + regionIndices.get_size ()
+ itemCount * get_row_size ();
}
float get_delta (unsigned int inner,
const int *coords, unsigned int coord_count,
const VarRegionList &regions,
VarRegionList::cache_t *cache = nullptr) const
{
if (unlikely (inner >= itemCount))
return 0.;
unsigned int count = regionIndices.len;
bool is_long = longWords ();
unsigned word_count = wordCount ();
unsigned int scount = is_long ? count - word_count : word_count;
unsigned int lcount = is_long ? word_count : 0;
const HBUINT8 *bytes = get_delta_bytes ();
const HBUINT8 *row = bytes + inner * (scount + count);
float delta = 0.;
unsigned int i = 0;
const HBINT16 *lcursor = reinterpret_cast<const HBINT16 *> (row);
for (; i < lcount; i++)
{
float scalar = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count, cache);
delta += scalar * *lcursor++;
}
const HBINT16 *scursor = reinterpret_cast<const HBINT16 *> (lcursor);
for (; i < scount; i++)
{
float scalar = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count, cache);
delta += scalar * *scursor++;
}
const HBINT8 *bcursor = reinterpret_cast<const HBINT8 *> (scursor);
for (; i < count; i++)
{
float scalar = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count, cache);
delta += scalar * *bcursor++;
}
return delta;
}
void get_region_scalars (const int *coords, unsigned int coord_count,
const VarRegionList &regions,
float *scalars /*OUT */,
unsigned int num_scalars) const
{
unsigned count = hb_min (num_scalars, regionIndices.len);
for (unsigned int i = 0; i < count; i++)
scalars[i] = regions.evaluate (regionIndices.arrayZ[i], coords, coord_count);
for (unsigned int i = count; i < num_scalars; i++)
scalars[i] = 0.f;
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
regionIndices.sanitize (c) &&
wordCount () <= regionIndices.len &&
c->check_range (get_delta_bytes (),
itemCount,
get_row_size ()));
}
bool serialize (hb_serialize_context_t *c,
const VarData *src,
const hb_inc_bimap_t &inner_map,
const hb_bimap_t &region_map)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
itemCount = inner_map.get_next_value ();
/* Optimize short count */
unsigned short ri_count = src->regionIndices.len;
enum delta_size_t { kZero=0, kByte, kShort };
hb_vector_t<delta_size_t> delta_sz;
hb_vector_t<unsigned int> ri_map; /* maps old index to new index */
delta_sz.resize (ri_count);
ri_map.resize (ri_count);
unsigned int new_short_count = 0;
unsigned int r;
for (r = 0; r < ri_count; r++)
{
delta_sz[r] = kZero;
for (unsigned int i = 0; i < inner_map.get_next_value (); i++)
{
unsigned int old = inner_map.backward (i);
int16_t delta = src->get_item_delta (old, r);
if (delta < -128 || 127 < delta)
{
delta_sz[r] = kShort;
new_short_count++;
break;
}
else if (delta != 0)
delta_sz[r] = kByte;
}
}
unsigned int short_index = 0;
unsigned int byte_index = new_short_count;
unsigned int new_ri_count = 0;
for (r = 0; r < ri_count; r++)
if (delta_sz[r])
{
ri_map[r] = (delta_sz[r] == kShort)? short_index++ : byte_index++;
new_ri_count++;
}
/* XXX TODO Support serializing 32bit VarStore. */
wordSizeCount = new_short_count;
regionIndices.len = new_ri_count;
if (unlikely (!c->extend (this))) return_trace (false);
for (r = 0; r < ri_count; r++)
if (delta_sz[r]) regionIndices[ri_map[r]] = region_map[src->regionIndices[r]];
for (unsigned int i = 0; i < itemCount; i++)
{
unsigned int old = inner_map.backward (i);
for (unsigned int r = 0; r < ri_count; r++)
if (delta_sz[r]) set_item_delta (i, ri_map[r], src->get_item_delta (old, r));
}
return_trace (true);
}
void collect_region_refs (hb_set_t &region_indices, const hb_inc_bimap_t &inner_map) const
{
for (unsigned int r = 0; r < regionIndices.len; r++)
{
unsigned int region = regionIndices[r];
if (region_indices.has (region)) continue;
for (unsigned int i = 0; i < inner_map.get_next_value (); i++)
if (get_item_delta (inner_map.backward (i), r) != 0)
{
region_indices.add (region);
break;
}
}
}
protected:
const HBUINT8 *get_delta_bytes () const
{ return &StructAfter<HBUINT8> (regionIndices); }
HBUINT8 *get_delta_bytes ()
{ return &StructAfter<HBUINT8> (regionIndices); }
int32_t get_item_delta (unsigned int item, unsigned int region) const
{
if ( item >= itemCount || unlikely (region >= regionIndices.len)) return 0;
const HBINT8 *p = (const HBINT8 *) get_delta_bytes () + item * get_row_size ();
unsigned word_count = wordCount ();
bool is_long = longWords ();
if (is_long)
{
if (region < word_count)
return ((const HBINT32 *) p)[region];
else
return ((const HBINT16 *)(p + HBINT32::static_size * word_count))[region - word_count];
}
else
{
if (region < word_count)
return ((const HBINT16 *) p)[region];
else
return (p + HBINT16::static_size * word_count)[region - word_count];
}
}
void set_item_delta (unsigned int item, unsigned int region, int32_t delta)
{
HBINT8 *p = (HBINT8 *)get_delta_bytes () + item * get_row_size ();
unsigned word_count = wordCount ();
bool is_long = longWords ();
if (is_long)
{
if (region < word_count)
((HBINT32 *) p)[region] = delta;
else
((HBINT16 *)(p + HBINT32::static_size * word_count))[region - word_count] = delta;
}
else
{
if (region < word_count)
((HBINT16 *) p)[region] = delta;
else
(p + HBINT16::static_size * word_count)[region - word_count] = delta;
}
}
bool longWords () const { return wordSizeCount & 0x8000u /* LONG_WORDS */; }
unsigned wordCount () const { return wordSizeCount & 0x7FFFu /* WORD_DELTA_COUNT_MASK */; }
protected:
HBUINT16 itemCount;
HBUINT16 wordSizeCount;
Array16Of<HBUINT16> regionIndices;
/*UnsizedArrayOf<HBUINT8>bytesX;*/
public:
DEFINE_SIZE_ARRAY (6, regionIndices);
};
struct VariationStore
{
using cache_t = VarRegionList::cache_t;
cache_t *create_cache () const
{
auto &r = this+regions;
unsigned count = r.regionCount;
float *cache = (float *) hb_malloc (sizeof (float) * count);
if (unlikely (!cache)) return nullptr;
for (unsigned i = 0; i < count; i++)
cache[i] = REGION_CACHE_ITEM_CACHE_INVALID;
return cache;
}
static void destroy_cache (cache_t *cache) { hb_free (cache); }
private:
float get_delta (unsigned int outer, unsigned int inner,
const int *coords, unsigned int coord_count,
VarRegionList::cache_t *cache = nullptr) const
{
#ifdef HB_NO_VAR
return 0.f;
#endif
if (unlikely (outer >= dataSets.len))
return 0.f;
return (this+dataSets[outer]).get_delta (inner,
coords, coord_count,
this+regions,
cache);
}
public:
float get_delta (unsigned int index,
const int *coords, unsigned int coord_count,
VarRegionList::cache_t *cache = nullptr) const
{
unsigned int outer = index >> 16;
unsigned int inner = index & 0xFFFF;
return get_delta (outer, inner, coords, coord_count, cache);
}
bool sanitize (hb_sanitize_context_t *c) const
{
#ifdef HB_NO_VAR
return true;
#endif
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) &&
format == 1 &&
regions.sanitize (c, this) &&
dataSets.sanitize (c, this));
}
bool serialize (hb_serialize_context_t *c,
const VariationStore *src,
const hb_array_t <hb_inc_bimap_t> &inner_maps)
{
TRACE_SERIALIZE (this);
if (unlikely (!c->extend_min (this))) return_trace (false);
unsigned int set_count = 0;
for (unsigned int i = 0; i < inner_maps.length; i++)
if (inner_maps[i].get_population ())
set_count++;
format = 1;
const auto &src_regions = src+src->regions;
hb_set_t region_indices;
for (unsigned int i = 0; i < inner_maps.length; i++)
(src+src->dataSets[i]).collect_region_refs (region_indices, inner_maps[i]);
if (region_indices.in_error ())
return_trace (false);
region_indices.del_range ((src_regions).regionCount, hb_set_t::INVALID);
/* TODO use constructor when our data-structures support that. */
hb_inc_bimap_t region_map;
+ hb_iter (region_indices)
| hb_apply ([&region_map] (unsigned _) { region_map.add(_); })
;
if (region_map.in_error())
return_trace (false);
if (unlikely (!regions.serialize_serialize (c, &src_regions, region_map)))
return_trace (false);
dataSets.len = set_count;
if (unlikely (!c->extend (dataSets))) return_trace (false);
/* TODO: The following code could be simplified when
* List16OfOffset16To::subset () can take a custom param to be passed to VarData::serialize () */
unsigned int set_index = 0;
for (unsigned int i = 0; i < inner_maps.length; i++)
{
if (!inner_maps[i].get_population ()) continue;
if (unlikely (!dataSets[set_index++]
.serialize_serialize (c, &(src+src->dataSets[i]), inner_maps[i], region_map)))
return_trace (false);
}
return_trace (true);
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
VariationStore *varstore_prime = c->serializer->start_embed<VariationStore> ();
if (unlikely (!varstore_prime)) return_trace (false);
const hb_set_t *variation_indices = c->plan->layout_variation_indices;
if (variation_indices->is_empty ()) return_trace (false);
hb_vector_t<hb_inc_bimap_t> inner_maps;
inner_maps.resize ((unsigned) dataSets.len);
for (unsigned idx : c->plan->layout_variation_indices->iter ())
{
uint16_t major = idx >> 16;
uint16_t minor = idx & 0xFFFF;
if (major >= inner_maps.length)
return_trace (false);
inner_maps[major].add (minor);
}
varstore_prime->serialize (c->serializer, this, inner_maps.as_array ());
return_trace (
!c->serializer->in_error()
&& varstore_prime->dataSets);
}
unsigned int get_region_index_count (unsigned int major) const
{ return (this+dataSets[major]).get_region_index_count (); }
void get_region_scalars (unsigned int major,
const int *coords, unsigned int coord_count,
float *scalars /*OUT*/,
unsigned int num_scalars) const
{
#ifdef HB_NO_VAR
for (unsigned i = 0; i < num_scalars; i++)
scalars[i] = 0.f;
return;
#endif
(this+dataSets[major]).get_region_scalars (coords, coord_count,
this+regions,
&scalars[0], num_scalars);
}
unsigned int get_sub_table_count () const { return dataSets.len; }
protected:
HBUINT16 format;
Offset32To<VarRegionList> regions;
Array16OfOffset32To<VarData> dataSets;
public:
DEFINE_SIZE_ARRAY_SIZED (8, dataSets);
};
#undef REGION_CACHE_ITEM_CACHE_INVALID
/*
* Feature Variations
*/
struct ConditionFormat1
{
friend struct Condition;
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->embed (this);
if (unlikely (!out)) return_trace (false);
return_trace (true);
}
private:
bool evaluate (const int *coords, unsigned int coord_len) const
{
int coord = axisIndex < coord_len ? coords[axisIndex] : 0;
return filterRangeMinValue <= coord && coord <= filterRangeMaxValue;
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
protected:
HBUINT16 format; /* Format identifier--format = 1 */
HBUINT16 axisIndex;
F2DOT14 filterRangeMinValue;
F2DOT14 filterRangeMaxValue;
public:
DEFINE_SIZE_STATIC (8);
};
struct Condition
{
bool evaluate (const int *coords, unsigned int coord_len) const
{
switch (u.format) {
case 1: return u.format1.evaluate (coords, coord_len);
default:return false;
}
}
template <typename context_t, typename ...Ts>
typename context_t::return_t dispatch (context_t *c, Ts&&... ds) const
{
TRACE_DISPATCH (this, u.format);
if (unlikely (!c->may_dispatch (this, &u.format))) return_trace (c->no_dispatch_return_value ());
switch (u.format) {
case 1: return_trace (c->dispatch (u.format1, std::forward<Ts> (ds)...));
default:return_trace (c->default_return_value ());
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.format.sanitize (c)) return_trace (false);
switch (u.format) {
case 1: return_trace (u.format1.sanitize (c));
default:return_trace (true);
}
}
protected:
union {
HBUINT16 format; /* Format identifier */
ConditionFormat1 format1;
} u;
public:
DEFINE_SIZE_UNION (2, format);
};
struct ConditionSet
{
bool evaluate (const int *coords, unsigned int coord_len) const
{
unsigned int count = conditions.len;
for (unsigned int i = 0; i < count; i++)
if (!(this+conditions.arrayZ[i]).evaluate (coords, coord_len))
return false;
return true;
}
bool subset (hb_subset_context_t *c) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
+ conditions.iter ()
| hb_apply (subset_offset_array (c, out->conditions, this))
;
return_trace (bool (out->conditions));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (conditions.sanitize (c, this));
}
protected:
Array16OfOffset32To<Condition> conditions;
public:
DEFINE_SIZE_ARRAY (2, conditions);
};
struct FeatureTableSubstitutionRecord
{
friend struct FeatureTableSubstitution;
void collect_lookups (const void *base, hb_set_t *lookup_indexes /* OUT */) const
{
return (base+feature).add_lookup_indexes_to (lookup_indexes);
}
void closure_features (const void *base,
const hb_map_t *lookup_indexes,
hb_set_t *feature_indexes /* OUT */) const
{
if ((base+feature).intersects_lookup_indexes (lookup_indexes))
feature_indexes->add (featureIndex);
}
bool subset (hb_subset_layout_context_t *c, const void *base) const
{
TRACE_SUBSET (this);
if (!c->feature_index_map->has (featureIndex)) {
// Feature that is being substituted is not being retained, so we don't
// need this.
return_trace (false);
}
auto *out = c->subset_context->serializer->embed (this);
if (unlikely (!out)) return_trace (false);
out->featureIndex = c->feature_index_map->get (featureIndex);
bool ret = out->feature.serialize_subset (c->subset_context, feature, base, c);
return_trace (ret);
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && feature.sanitize (c, base));
}
protected:
HBUINT16 featureIndex;
Offset32To<Feature> feature;
public:
DEFINE_SIZE_STATIC (6);
};
struct FeatureTableSubstitution
{
const Feature *find_substitute (unsigned int feature_index) const
{
unsigned int count = substitutions.len;
for (unsigned int i = 0; i < count; i++)
{
const FeatureTableSubstitutionRecord &record = substitutions.arrayZ[i];
if (record.featureIndex == feature_index)
return &(this+record.feature);
}
return nullptr;
}
void collect_lookups (const hb_set_t *feature_indexes,
hb_set_t *lookup_indexes /* OUT */) const
{
+ hb_iter (substitutions)
| hb_filter (feature_indexes, &FeatureTableSubstitutionRecord::featureIndex)
| hb_apply ([this, lookup_indexes] (const FeatureTableSubstitutionRecord& r)
{ r.collect_lookups (this, lookup_indexes); })
;
}
void closure_features (const hb_map_t *lookup_indexes,
hb_set_t *feature_indexes /* OUT */) const
{
for (const FeatureTableSubstitutionRecord& record : substitutions)
record.closure_features (this, lookup_indexes, feature_indexes);
}
bool intersects_features (const hb_map_t *feature_index_map) const
{
for (const FeatureTableSubstitutionRecord& record : substitutions)
{
if (feature_index_map->has (record.featureIndex)) return true;
}
return false;
}
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
out->version.major = version.major;
out->version.minor = version.minor;
+ substitutions.iter ()
| hb_apply (subset_record_array (l, &(out->substitutions), this))
;
return_trace (bool (out->substitutions));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (version.sanitize (c) &&
likely (version.major == 1) &&
substitutions.sanitize (c, this));
}
protected:
FixedVersion<> version; /* Version--0x00010000u */
Array16Of<FeatureTableSubstitutionRecord>
substitutions;
public:
DEFINE_SIZE_ARRAY (6, substitutions);
};
struct FeatureVariationRecord
{
friend struct FeatureVariations;
void collect_lookups (const void *base,
const hb_set_t *feature_indexes,
hb_set_t *lookup_indexes /* OUT */) const
{
return (base+substitutions).collect_lookups (feature_indexes, lookup_indexes);
}
void closure_features (const void *base,
const hb_map_t *lookup_indexes,
hb_set_t *feature_indexes /* OUT */) const
{
(base+substitutions).closure_features (lookup_indexes, feature_indexes);
}
bool intersects_features (const void *base, const hb_map_t *feature_index_map) const
{
return (base+substitutions).intersects_features (feature_index_map);
}
bool subset (hb_subset_layout_context_t *c, const void *base) const
{
TRACE_SUBSET (this);
auto *out = c->subset_context->serializer->embed (this);
if (unlikely (!out)) return_trace (false);
out->conditions.serialize_subset (c->subset_context, conditions, base);
out->substitutions.serialize_subset (c->subset_context, substitutions, base, c);
return_trace (true);
}
bool sanitize (hb_sanitize_context_t *c, const void *base) const
{
TRACE_SANITIZE (this);
return_trace (conditions.sanitize (c, base) &&
substitutions.sanitize (c, base));
}
protected:
Offset32To<ConditionSet>
conditions;
Offset32To<FeatureTableSubstitution>
substitutions;
public:
DEFINE_SIZE_STATIC (8);
};
struct FeatureVariations
{
static constexpr unsigned NOT_FOUND_INDEX = 0xFFFFFFFFu;
bool find_index (const int *coords, unsigned int coord_len,
unsigned int *index) const
{
unsigned int count = varRecords.len;
for (unsigned int i = 0; i < count; i++)
{
const FeatureVariationRecord &record = varRecords.arrayZ[i];
if ((this+record.conditions).evaluate (coords, coord_len))
{
*index = i;
return true;
}
}
*index = NOT_FOUND_INDEX;
return false;
}
const Feature *find_substitute (unsigned int variations_index,
unsigned int feature_index) const
{
const FeatureVariationRecord &record = varRecords[variations_index];
return (this+record.substitutions).find_substitute (feature_index);
}
FeatureVariations* copy (hb_serialize_context_t *c) const
{
TRACE_SERIALIZE (this);
return_trace (c->embed (*this));
}
void collect_lookups (const hb_set_t *feature_indexes,
hb_set_t *lookup_indexes /* OUT */) const
{
for (const FeatureVariationRecord& r : varRecords)
r.collect_lookups (this, feature_indexes, lookup_indexes);
}
void closure_features (const hb_map_t *lookup_indexes,
hb_set_t *feature_indexes /* OUT */) const
{
for (const FeatureVariationRecord& record : varRecords)
record.closure_features (this, lookup_indexes, feature_indexes);
}
bool subset (hb_subset_context_t *c,
hb_subset_layout_context_t *l) const
{
TRACE_SUBSET (this);
auto *out = c->serializer->start_embed (*this);
if (unlikely (!out || !c->serializer->extend_min (out))) return_trace (false);
out->version.major = version.major;
out->version.minor = version.minor;
int keep_up_to = -1;
for (int i = varRecords.len - 1; i >= 0; i--) {
if (varRecords[i].intersects_features (this, l->feature_index_map)) {
keep_up_to = i;
break;
}
}
unsigned count = (unsigned) (keep_up_to + 1);
for (unsigned i = 0; i < count; i++) {
subset_record_array (l, &(out->varRecords), this) (varRecords[i]);
}
return_trace (bool (out->varRecords));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (version.sanitize (c) &&
likely (version.major == 1) &&
varRecords.sanitize (c, this));
}
protected:
FixedVersion<> version; /* Version--0x00010000u */
Array32Of<FeatureVariationRecord>
varRecords;
public:
DEFINE_SIZE_ARRAY_SIZED (8, varRecords);
};
/*
* Device Tables
*/
struct HintingDevice
{
friend struct Device;
private:
hb_position_t get_x_delta (hb_font_t *font) const
{ return get_delta (font->x_ppem, font->x_scale); }
hb_position_t get_y_delta (hb_font_t *font) const
{ return get_delta (font->y_ppem, font->y_scale); }
public:
unsigned int get_size () const
{
unsigned int f = deltaFormat;
if (unlikely (f < 1 || f > 3 || startSize > endSize)) return 3 * HBUINT16::static_size;
return HBUINT16::static_size * (4 + ((endSize - startSize) >> (4 - f)));
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this) && c->check_range (this, this->get_size ()));
}
HintingDevice* copy (hb_serialize_context_t *c) const
{
TRACE_SERIALIZE (this);
return_trace (c->embed<HintingDevice> (this));
}
private:
int get_delta (unsigned int ppem, int scale) const
{
if (!ppem) return 0;
int pixels = get_delta_pixels (ppem);
if (!pixels) return 0;
return (int) (pixels * (int64_t) scale / ppem);
}
int get_delta_pixels (unsigned int ppem_size) const
{
unsigned int f = deltaFormat;
if (unlikely (f < 1 || f > 3))
return 0;
if (ppem_size < startSize || ppem_size > endSize)
return 0;
unsigned int s = ppem_size - startSize;
unsigned int byte = deltaValueZ[s >> (4 - f)];
unsigned int bits = (byte >> (16 - (((s & ((1 << (4 - f)) - 1)) + 1) << f)));
unsigned int mask = (0xFFFFu >> (16 - (1 << f)));
int delta = bits & mask;
if ((unsigned int) delta >= ((mask + 1) >> 1))
delta -= mask + 1;
return delta;
}
protected:
HBUINT16 startSize; /* Smallest size to correct--in ppem */
HBUINT16 endSize; /* Largest size to correct--in ppem */
HBUINT16 deltaFormat; /* Format of DeltaValue array data: 1, 2, or 3
* 1 Signed 2-bit value, 8 values per uint16
* 2 Signed 4-bit value, 4 values per uint16
* 3 Signed 8-bit value, 2 values per uint16
*/
UnsizedArrayOf<HBUINT16>
deltaValueZ; /* Array of compressed data */
public:
DEFINE_SIZE_ARRAY (6, deltaValueZ);
};
struct VariationDevice
{
friend struct Device;
private:
hb_position_t get_x_delta (hb_font_t *font,
const VariationStore &store,
VariationStore::cache_t *store_cache = nullptr) const
{ return font->em_scalef_x (get_delta (font, store, store_cache)); }
hb_position_t get_y_delta (hb_font_t *font,
const VariationStore &store,
VariationStore::cache_t *store_cache = nullptr) const
{ return font->em_scalef_y (get_delta (font, store, store_cache)); }
VariationDevice* copy (hb_serialize_context_t *c, const hb_map_t *layout_variation_idx_map) const
{
TRACE_SERIALIZE (this);
auto snap = c->snapshot ();
auto *out = c->embed (this);
if (unlikely (!out)) return_trace (nullptr);
if (!layout_variation_idx_map || layout_variation_idx_map->is_empty ()) return_trace (out);
/* TODO Just get() and bail if NO_VARIATION. Needs to setup the map to return that. */
if (!layout_variation_idx_map->has (varIdx))
{
c->revert (snap);
return_trace (nullptr);
}
unsigned new_idx = layout_variation_idx_map->get (varIdx);
out->varIdx = new_idx;
return_trace (out);
}
void record_variation_index (hb_set_t *layout_variation_indices) const
{
layout_variation_indices->add (varIdx);
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
return_trace (c->check_struct (this));
}
private:
float get_delta (hb_font_t *font,
const VariationStore &store,
VariationStore::cache_t *store_cache = nullptr) const
{
return store.get_delta (varIdx, font->coords, font->num_coords, (VariationStore::cache_t *) store_cache);
}
protected:
VarIdx varIdx;
HBUINT16 deltaFormat; /* Format identifier for this table: 0x0x8000 */
public:
DEFINE_SIZE_STATIC (6);
};
struct DeviceHeader
{
protected:
HBUINT16 reserved1;
HBUINT16 reserved2;
public:
HBUINT16 format; /* Format identifier */
public:
DEFINE_SIZE_STATIC (6);
};
struct Device
{
hb_position_t get_x_delta (hb_font_t *font,
const VariationStore &store=Null (VariationStore),
VariationStore::cache_t *store_cache = nullptr) const
{
switch (u.b.format)
{
#ifndef HB_NO_HINTING
case 1: case 2: case 3:
return u.hinting.get_x_delta (font);
#endif
#ifndef HB_NO_VAR
case 0x8000:
return u.variation.get_x_delta (font, store, store_cache);
#endif
default:
return 0;
}
}
hb_position_t get_y_delta (hb_font_t *font,
const VariationStore &store=Null (VariationStore),
VariationStore::cache_t *store_cache = nullptr) const
{
switch (u.b.format)
{
case 1: case 2: case 3:
#ifndef HB_NO_HINTING
return u.hinting.get_y_delta (font);
#endif
#ifndef HB_NO_VAR
case 0x8000:
return u.variation.get_y_delta (font, store, store_cache);
#endif
default:
return 0;
}
}
bool sanitize (hb_sanitize_context_t *c) const
{
TRACE_SANITIZE (this);
if (!u.b.format.sanitize (c)) return_trace (false);
switch (u.b.format) {
#ifndef HB_NO_HINTING
case 1: case 2: case 3:
return_trace (u.hinting.sanitize (c));
#endif
#ifndef HB_NO_VAR
case 0x8000:
return_trace (u.variation.sanitize (c));
#endif
default:
return_trace (true);
}
}
Device* copy (hb_serialize_context_t *c, const hb_map_t *layout_variation_idx_map=nullptr) const
{
TRACE_SERIALIZE (this);
switch (u.b.format) {
#ifndef HB_NO_HINTING
case 1:
case 2:
case 3:
return_trace (reinterpret_cast<Device *> (u.hinting.copy (c)));
#endif
#ifndef HB_NO_VAR
case 0x8000:
return_trace (reinterpret_cast<Device *> (u.variation.copy (c, layout_variation_idx_map)));
#endif
default:
return_trace (nullptr);
}
}
void collect_variation_indices (hb_set_t *layout_variation_indices) const
{
switch (u.b.format) {
#ifndef HB_NO_HINTING
case 1:
case 2:
case 3:
return;
#endif
#ifndef HB_NO_VAR
case 0x8000:
u.variation.record_variation_index (layout_variation_indices);
return;
#endif
default:
return;
}
}
protected:
union {
DeviceHeader b;
HintingDevice hinting;
#ifndef HB_NO_VAR
VariationDevice variation;
#endif
} u;
public:
DEFINE_SIZE_UNION (6, b);
};
} /* namespace OT */
#endif /* HB_OT_LAYOUT_COMMON_HH */
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