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[repacker] add a maximum number of roots that can be moved in one iteration. 

Set to half of the roots in a space. This prevents the repacker from moving all roots in a space to a new space if their are overflows in every root.
This commit is contained in:
Garret Rieger 2021-12-06 16:00:15 -08:00 committed by Behdad Esfahbod
parent 02b12d7965
commit 3e4a25098d
1 changed files with 12 additions and 9 deletions
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21
src/hb-repacker.hh
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@ -745,15 +745,6 @@ struct graph_t
return space_for (node.parents[0], root);
}
void roots_with_space (unsigned space, hb_set_t* roots) const
{
for (unsigned i = 0; i < vertices_.length; i++) {
if (vertices_[i].space == space) {
roots->add (i);
}
}
}
void err_other_error () { this->successful = false; }
private:
@ -1104,6 +1095,7 @@ static bool _try_isolating_subgraphs (const hb_vector_t<graph_t::overflow_record
unsigned root;
unsigned overflow_space = sorted_graph.space_for (r.parent, &root);
if (!overflow_space) continue;
if (sorted_graph.num_roots_for_space (overflow_space) <= 1) continue;
if (!space) {
space = overflow_space;
@ -1115,6 +1107,17 @@ static bool _try_isolating_subgraphs (const hb_vector_t<graph_t::overflow_record
if (!roots_to_isolate) return false;
unsigned maximum_to_move = hb_max ((sorted_graph.num_roots_for_space (space) / 2u), 1u);
if (roots_to_isolate.get_population () > maximum_to_move) {
// Only move at most half of the roots in a space at a time.
unsigned extra = roots_to_isolate.get_population () - maximum_to_move;
while (extra--) {
unsigned root = HB_SET_VALUE_INVALID;
roots_to_isolate.previous (&root);
roots_to_isolate.del (root);
}
}
DEBUG_MSG (SUBSET_REPACK, nullptr,
"Overflow in space %d (%d roots). Moving %d roots to space %d.",
space,