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[instancer] add unpack_axis_tuples () in TupleVariationHeader

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Qunxin Liu 2023-06-05 13:35:28 -07:00
parent 7b0ecbd896
commit 9f508b7393
1 changed files with 47 additions and 0 deletions
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47
src/hb-ot-var-common.hh
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@ -249,6 +249,53 @@ struct TupleVariationHeader
const TupleVariationHeader &get_next (unsigned axis_count) const
{ return StructAtOffset<TupleVariationHeader> (this, get_size (axis_count)); }
bool unpack_axis_tuples (unsigned axis_count,
const hb_array_t<const F2DOT14> shared_tuples,
hb_hashmap_t<hb_tag_t, Triple>& axis_tuples /* OUT */) const
{
const F2DOT14 *peak_tuple = nullptr;
if (has_peak ())
peak_tuple = get_peak_tuple (axis_count).arrayZ;
else
{
unsigned int index = get_index ();
if (unlikely ((index + 1) * axis_count > shared_tuples.length))
return false;
peak_tuple = shared_tuples.sub_array (axis_count * index, axis_count).arrayZ;
}
const F2DOT14 *start_tuple = nullptr;
const F2DOT14 *end_tuple = nullptr;
bool has_interm = has_intermediate ();
if (has_interm)
{
start_tuple = get_start_tuple (axis_count).arrayZ;
end_tuple = get_end_tuple (axis_count).arrayZ;
}
for (unsigned i = 0; i < axis_count; i++)
{
float peak = peak_tuple[i].to_float ();
if (peak == 0.f) continue;
float start, end;
if (has_interm)
{
start = start_tuple[i].to_float ();
end = end_tuple[i].to_float ();
}
else
{
start = hb_min (peak, 0.f);
end = hb_max (peak, 0.f);
}
axis_tuples.set (i, Triple (start, peak, end));
}
return true;
}
float calculate_scalar (hb_array_t<int> coords, unsigned int coord_count,
const hb_array_t<const F2DOT14> shared_tuples,
const hb_vector_t<int> *shared_tuple_active_idx = nullptr) const