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[subset] Write CoverageFormat2::intersects_coverage() as bsearch()

This commit is contained in:
Behdad Esfahbod 2022-05-18 14:20:23 -06:00
parent 63c6695108
commit c476f58adb
1 changed files with 14 additions and 9 deletions
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23
src/hb-ot-layout-common.hh
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@ -1552,16 +1552,21 @@ struct CoverageFormat2
}
bool intersects_coverage (const hb_set_t *glyphs, unsigned int index) const
{
/* TODO Use bsearch? */
for (const auto& range : rangeRecord.as_array ())
auto cmp = [] (const void *pk, const void *pr) -> int
{
if (range.value <= index &&
index < (unsigned int) range.value + (range.last - range.first) &&
range.intersects (glyphs))
return true;
else if (index < range.value)
return false;
}
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;
}