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[layout] Use buffer-digest for GSUB as well 

Combined with previous commit, this shows up to 12% speed up with
Roboto and the en-words (ie. short strings) benchmark, about 5%
for longer English tests, and no adverse effect on heavier fonts.
This commit is contained in:
Behdad Esfahbod 2022-11-16 16:09:04 -07:00
parent 15b6c32599
commit 654a2eafc8
1 changed files with 21 additions and 13 deletions
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34
src/hb-ot-layout.cc
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@ -1908,15 +1908,16 @@ apply_backward (OT::hb_ot_apply_context_t *c,
}
template <typename Proxy>
static inline void
static inline bool
apply_string (OT::hb_ot_apply_context_t *c,
const typename Proxy::Lookup &lookup,
const OT::hb_ot_layout_lookup_accelerator_t &accel)
{
bool ret = false;
hb_buffer_t *buffer = c->buffer;
if (unlikely (!buffer->len || !c->lookup_mask))
return;
return ret;
c->set_lookup_props (lookup.get_props ());
@ -1927,7 +1928,7 @@ apply_string (OT::hb_ot_apply_context_t *c,
buffer->clear_output ();
buffer->idx = 0;
apply_forward (c, accel);
ret = apply_forward (c, accel);
if (!Proxy::always_inplace)
buffer->sync ();
@ -1937,8 +1938,10 @@ apply_string (OT::hb_ot_apply_context_t *c,
/* in-place backward substitution/positioning */
assert (!buffer->have_output);
buffer->idx = buffer->len - 1;
apply_backward (c, accel);
ret = apply_backward (c, accel);
}
return ret;
}
template <typename Proxy>
@ -1954,10 +1957,9 @@ inline void hb_ot_map_t::apply (const Proxy &proxy,
hb_set_digest_t digest;
digest.init ();
if (proxy.table_index == 1) /* GPOS */
digest.add_array (&buffer->info[0].codepoint,
buffer->len,
sizeof (buffer->info[0]));
digest.add_array (&buffer->info[0].codepoint,
buffer->len,
sizeof (buffer->info[0]));
for (unsigned int stage_index = 0; stage_index < stages[table_index].length; stage_index++)
{
@ -1967,8 +1969,7 @@ inline void hb_ot_map_t::apply (const Proxy &proxy,
unsigned int lookup_index = lookups[table_index][i].index;
if (!buffer->message (font, "start lookup %d", lookup_index)) continue;
if (table_index != 1 ||
proxy.accels[lookup_index].digest.may_have (digest))
if (proxy.accels[lookup_index].digest.may_have (digest))
{
c.set_lookup_index (lookup_index);
c.set_lookup_mask (lookups[table_index][i].mask);
@ -1977,9 +1978,16 @@ inline void hb_ot_map_t::apply (const Proxy &proxy,
c.set_random (lookups[table_index][i].random);
c.set_per_syllable (lookups[table_index][i].per_syllable);
apply_string<Proxy> (&c,
proxy.table.get_lookup (lookup_index),
proxy.accels[lookup_index]);
if (apply_string<Proxy> (&c,
proxy.table.get_lookup (lookup_index),
proxy.accels[lookup_index]) &&
table_index == 0)
{
digest.init ();
digest.add_array (&buffer->info[0].codepoint,
buffer->len,
sizeof (buffer->info[0]));
}
}
(void) buffer->message (font, "end lookup %d", lookup_index);