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[repacker] Add AnchorMatrix::shrink.

This commit is contained in:
Garret Rieger 2022-08-11 23:09:36 +00:00
parent bbe14417ad
commit f8b5520556
1 changed files with 40 additions and 1 deletions
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41
src/graph/markbasepos-graph.hh
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@ -42,6 +42,36 @@ struct AnchorMatrix : public OT::Layout::GPOS_impl::AnchorMatrix
return false;
}
bool shrink (gsubgpos_graph_context_t& c,
unsigned this_index,
unsigned old_class_count,
unsigned new_class_count)
{
if (new_class_count >= old_class_count) return false;
auto& o = c.graph.vertices_[this_index].obj;
unsigned base_count = rows;
o.tail = o.head +
AnchorMatrix::min_size +
OT::Offset16::static_size * base_count * new_class_count;
// Reposition links into the new indexing scheme.
for (auto& link : o.real_links.writer ())
{
unsigned index = (link.position - 2) / 2;
unsigned base = index / old_class_count;
unsigned klass = index % old_class_count;
if (klass >= new_class_count)
// should have already been removed
return false;
unsigned new_index = base * new_class_count + klass;
link.position = (char*) &(this->matrixZ[new_index]) - (char*) this;
}
return true;
}
unsigned clone (gsubgpos_graph_context_t& c,
unsigned this_index,
const hb_hashmap_t<unsigned, unsigned>& pos_to_index,
@ -300,7 +330,16 @@ struct MarkBasePosFormat1 : public OT::Layout::GPOS_impl::MarkBasePosFormat1_2<S
4 + 2 * marks.get_population ()))
return false;
// TODO: markArray, baseArray
auto base_array = sc.c.graph.as_table<AnchorMatrix> (this_index,
&baseArray);
if (!base_array || !base_array.table->shrink (sc.c,
base_array.index,
old_count,
count))
return false;
// TODO: markArray
/*