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[subset] Match FeatureVariationRecord dropping from fontTools. 

Only drop records with no matching features that are at the end of the list. See: cab7d13dc0
This commit is contained in:
Garret Rieger 2021-04-01 13:35:30 -07:00
parent f0c78e0282
commit 55e7f3fe32
1 changed files with 30 additions and 6 deletions
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36
src/hb-ot-layout-common.hh
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@ -3060,6 +3060,15 @@ struct FeatureTableSubstitution
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
{
@ -3111,15 +3120,21 @@ struct FeatureVariationRecord
(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);
if (!out->conditions.serialize_subset (c->subset_context, conditions, base))
return_trace (false);
return_trace (out->substitutions.serialize_subset (c->subset_context, substitutions, base, c));
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
@ -3196,9 +3211,18 @@ struct FeatureVariations
out->version.major = version.major;
out->version.minor = version.minor;
+ varRecords.iter ()
| hb_apply (subset_record_array (l, &(out->varRecords), this))
;
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));
}