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[instance] update FeatureList with variations

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pull/3833/head
Qunxin Liu 2 years ago committed by Garret Rieger
parent 8f3a7017c3
commit b706c6f77e
1 changed files with 144 additions and 90 deletions
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  1. 234
      src/hb-ot-layout-common.hh

234
src/hb-ot-layout-common.hh
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@ -353,6 +353,31 @@ struct subset_record_array_t
const void *base;
};
template<typename OutputArray, typename Arg>
struct subset_record_array_arg_t
{
subset_record_array_arg_t (hb_subset_layout_context_t *c_, OutputArray* out_,
const void *base_,
Arg &&arg_) : subset_layout_context (c_),
out (out_), base (base_), arg (arg_) {}
template <typename T>
void
operator () (T&& record)
{
auto snap = subset_layout_context->subset_context->serializer->snapshot ();
bool ret = record.subset (subset_layout_context, base, arg);
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;
Arg &&arg;
};
/*
* Helper to subset a RecordList/record array. Subsets each Record in the array and
* discards the record if the subset operation returns false.
@ -364,6 +389,13 @@ struct
operator () (hb_subset_layout_context_t *c, OutputArray* out,
const void *base) const
{ return subset_record_array_t<OutputArray> (c, out, base); }
/* Variant with one extra argument passed to subset */
template<typename OutputArray, typename Arg>
subset_record_array_arg_t<OutputArray, Arg>
operator () (hb_subset_layout_context_t *c, OutputArray* out,
const void *base, Arg &&arg) const
{ return subset_record_array_arg_t<OutputArray, Arg> (c, out, base, arg); }
}
HB_FUNCOBJ (subset_record_array);
@ -460,94 +492,6 @@ struct IndexArray : Array16Of<Index>
};
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));
}
};
/* https://docs.microsoft.com/en-us/typography/opentype/spec/features_pt#size */
struct FeatureParamsSize
{
@ -830,6 +774,10 @@ struct FeatureParams
DEFINE_SIZE_MIN (0);
};
struct Record_sanitize_closure_t {
hb_tag_t tag;
const void *list_base;
};
struct Feature
{
@ -926,6 +874,103 @@ struct Feature
DEFINE_SIZE_ARRAY_SIZED (4, lookupIndex);
};
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 void *f_sub = nullptr) const
{
TRACE_SUBSET (this);
auto *out = c->subset_context->serializer->embed (this);
if (unlikely (!out)) return_trace (false);
if (!f_sub)
return_trace (out->offset.serialize_subset (c->subset_context, offset, base, c, &tag));
const Feature& f = *reinterpret_cast<const Feature *> (f_sub);
auto *s = c->subset_context->serializer;
s->push ();
out->offset = 0;
bool ret = f.subset (c->subset_context, c, &tag);
if (ret)
s->add_link (out->offset, s->pop_pack ());
else
s->pop_discard ();
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 RecordListOfFeature : RecordListOf<Feature>
{
bool subset (hb_subset_context_t *c,
@ -936,11 +981,20 @@ struct RecordListOfFeature : RecordListOf<Feature>
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))
| hb_apply ([l, out, this] (const hb_pair_t<const Record<Feature>&, unsigned>& _)
{
const Feature *f_sub = nullptr;
const Feature **f = nullptr;
if (l->feature_substitutes_map->has (_.second, &f))
f_sub = *f;
subset_record_array (l, out, this, f_sub) (_.first);
})
;
return_trace (true);
}
};

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