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[instancer] add struct tuple_variation_t

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And add function to decompile TupleVariationData into the struct
This commit is contained in:
Qunxin Liu 2023-06-05 13:46:04 -07:00
parent 9f508b7393
commit 2012df0755
1 changed files with 111 additions and 0 deletions
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111
src/hb-ot-var-common.hh
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@ -564,8 +564,106 @@ struct TupleVariationData
const TupleVariationHeader &get_tuple_var_header (void) const
{ return StructAfter<TupleVariationHeader> (data); }
struct tuple_iterator_t;
struct tuple_variations_t
{
hb_vector_t<tuple_delta_t> tuple_vars;
void fini () { tuple_vars.fini (); }
bool create_from_tuple_var_data (tuple_iterator_t iterator,
unsigned tuple_var_count,
unsigned point_count,
bool is_gvar,
const hb_vector_t<unsigned> &shared_indices,
const hb_array_t<const F2DOT14> shared_tuples)
{
do
{
const HBUINT8 *p = iterator.get_serialized_data ();
unsigned int length = iterator.current_tuple->get_data_size ();
if (unlikely (!iterator.var_data_bytes.check_range (p, length)))
{ fini (); return false; }
hb_hashmap_t<unsigned, Triple> axis_tuples;
if (!iterator.current_tuple->unpack_axis_tuples (iterator.get_axis_count (), shared_tuples, axis_tuples)
|| axis_tuples.is_empty ())
{ fini (); return false; }
hb_vector_t<unsigned> private_indices;
bool has_private_points = iterator.current_tuple->has_private_points ();
const HBUINT8 *end = p + length;
if (has_private_points &&
!TupleVariationData::unpack_points (p, private_indices, end))
{ fini (); return false; }
const hb_vector_t<unsigned> &indices = has_private_points ? private_indices : shared_indices;
unsigned num_deltas = indices.length;
hb_vector_t<int> deltas_x;
if (unlikely (!deltas_x.resize (num_deltas, false) ||
!TupleVariationData::unpack_deltas (p, deltas_x, end)))
{ fini (); return false; }
hb_vector_t<int> deltas_y;
if (is_gvar)
{
if (unlikely (!deltas_y.resize (num_deltas, false) ||
!TupleVariationData::unpack_deltas (p, deltas_y, end)))
{ fini (); return false; }
}
tuple_delta_t var;
var.axis_tuples = std::move (axis_tuples);
if (unlikely (!var.indices.resize (point_count) ||
!var.deltas_x.resize (point_count, false)))
{ fini (); return false; }
if (is_gvar && unlikely (!var.deltas_y.resize (point_count, false)))
{ fini (); return false; }
for (unsigned i = 0; i < num_deltas; i++)
{
unsigned idx = indices[i];
var.indices[idx] = 1;
var.deltas_x[idx] = static_cast<float> (deltas_x[i]);
if (is_gvar)
var.deltas_y[idx] = static_cast<float> (deltas_y[i]);
}
tuple_vars.push (std::move (var));
} while (iterator.move_to_next ());
return true;
}
void change_tuple_variations_axis_limits (const hb_hashmap_t<hb_tag_t, Triple> *normalized_axes_location)
{
for (auto _ : *normalized_axes_location)
{
hb_tag_t axis_tag = _.first;
Triple axis_limit = _.second;
hb_vector_t<tuple_delta_t> new_vars;
for (const tuple_delta_t& var : tuple_vars)
{
hb_vector_t<tuple_delta_t> out = var.change_tuple_var_axis_limit (axis_tag, axis_limit);
if (!out) continue;
unsigned new_len = new_vars.length + out.length;
if (unlikely (!new_vars.resize (new_len, false)))
{ fini (); return;}
for (unsigned i = 0; i < out.length; i++)
new_vars.push (std::move (out[i]));
}
tuple_vars.fini ();
tuple_vars = std::move (new_vars);
}
}
};
struct tuple_iterator_t
{
unsigned get_axis_count () const { return axis_count; }
void init (hb_bytes_t var_data_bytes_, unsigned int axis_count_, const void *table_base_)
{
var_data_bytes = var_data_bytes_;
@ -733,6 +831,19 @@ struct TupleVariationData
bool has_data () const { return tupleVarCount; }
bool decompile_tuple_variations (unsigned point_count,
bool is_gvar,
tuple_iterator_t iterator,
const hb_vector_t<unsigned> &shared_indices,
const hb_array_t<const F2DOT14> shared_tuples,
tuple_variations_t& tuple_variations /* OUT */) const
{
return tuple_variations.create_from_tuple_var_data (iterator, tupleVarCount,
point_count, is_gvar,
shared_indices,
shared_tuples);
}
protected:
struct TupleVarCount : HBUINT16
{