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[ot-layout] Narrow down random feature logic vs safe-to-break

This commit is contained in:
Behdad Esfahbod 2021-07-09 17:17:05 -06:00
parent 33b579d0ad
commit 40884af17e
2 changed files with 5 additions and 2 deletions
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5
src/hb-ot-layout-gsub-table.hh
View File

@ -559,7 +559,12 @@ struct AlternateSet
/* If alt_index is MAX_VALUE, randomize feature if it is the rand feature. */
if (alt_index == HB_OT_MAP_MAX_VALUE && c->random)
{
/* Maybe we can do better than unsafe-to-break all; but since we are
* changing random state, it would be hard to track that. Good 'nough. */
c->buffer->unsafe_to_break_all ();
alt_index = c->random_number () % count + 1;
}
if (unlikely (alt_index > count || alt_index == 0)) return_trace (false);

2
src/hb-ot-layout.cc
View File

@ -1933,8 +1933,6 @@ inline void hb_ot_map_t::apply (const Proxy &proxy,
c.set_auto_zwj (lookups[table_index][i].auto_zwj);
c.set_auto_zwnj (lookups[table_index][i].auto_zwnj);
c.set_random (lookups[table_index][i].random);
if (c.random)
buffer->unsafe_to_break_all ();
apply_string<Proxy> (&c,
proxy.table.get_lookup (lookup_index),