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[subset] In cmap4 serialization reduce unnessecary calls into the iterator. 

Gives ~20% speedup for large subsets.
This commit is contained in:
Garret Rieger 2022-04-29 22:49:02 +00:00
parent 5e241094bf
commit 17b98563dc
1 changed files with 16 additions and 12 deletions
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28
src/hb-ot-cmap-table.hh
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@ -109,22 +109,26 @@ struct CmapSubtableFormat4
while (it) {
// Start a new range
start_cp = (*it).first;
prev_run_start_cp = (*it).first;
run_start_cp = (*it).first;
end_cp = (*it).first;
last_gid = (*it).second;
run_length = 1;
prev_delta = 0;
{
const auto& pair = *it;
start_cp = pair.first;
prev_run_start_cp = start_cp;
run_start_cp = start_cp;
end_cp = start_cp;
last_gid = pair.second;
run_length = 1;
prev_delta = 0;
}
delta = (*it).second - (*it).first;
delta = last_gid - start_cp;
mode = FIRST_SUB_RANGE;
it++;
while (it) {
// Process range
hb_codepoint_t next_cp = (*it).first;
hb_codepoint_t next_gid = (*it).second;
const auto& pair = *it;
hb_codepoint_t next_cp = pair.first;
hb_codepoint_t next_gid = pair.second;
if (next_cp != end_cp + 1) {
// Current range is over, stop processing.
break;
@ -323,7 +327,7 @@ struct CmapSubtableFormat4
{ return _.first <= 0xFFFF; })
;
if (format4_iter.len () == 0) return;
if (!format4_iter) return;
unsigned table_initpos = c->length ();
if (unlikely (!c->extend_min (this))) return;
@ -1474,7 +1478,7 @@ struct SubtableUnicodesCache {
hb_set_t* new_set = hb_set_create ();
if (!cached_unicodes.set ((intptr_t) record, new_set)) {
hb_set_destroy (new_set);
return hb_set_empty ();
return hb_set_get_empty ();
}
(base+record->subtable).collect_unicodes (cached_unicodes.get ((intptr_t) record));
}