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[subset/regaingid/glyf] Add a fastpath for empty glyphs

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Mplus benchmark:
Comparing before to after
Benchmark                                                                      Time             CPU      Time Old      Time New       CPU Old       CPU New
-----------------------------------------------------------------------------------------------------------------------------------------------------------
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/retaingids/10                   -0.1764         -0.1771             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/retaingids/64                   -0.1394         -0.1394             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/retaingids/512                  -0.0644         -0.0645             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/retaingids/4096                 +0.0132         +0.0131             1             1             1             1
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/retaingids/10000                -0.0029         -0.0034             3             3             3             3
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/10                              +0.0364         +0.0362             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/64                              +0.0346         +0.0343             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/512                             +0.0271         +0.0268             0             0             0             0
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/4096                            +0.0193         +0.0193             1             1             1             1
BM_subset/subset_glyphs/Mplus1p-Regular.ttf/10000                           -0.0240         -0.0243             2             2             2             2
OVERALL_GEOMEAN                                                             -0.0305         -0.0307             0             0             0             0
This commit is contained in:
Behdad Esfahbod 2023-06-01 18:47:58 -06:00
parent 6ec7629fba
commit 4d853b8ba6
1 changed files with 17 additions and 0 deletions
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17
src/OT/glyf/SubsetGlyph.hh
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@ -26,6 +26,23 @@ struct SubsetGlyph
{
TRACE_SERIALIZE (this);
if (length () == 0)
{
/* Fast path for retain-gid holes. */
unsigned int pad_length = use_short_loca ? padding () : 0;
DEBUG_MSG (SUBSET, nullptr, "serialize empty glyph, pad %u", pad_length);
HBUINT8 pad;
pad = 0;
while (pad_length > 0)
{
c->embed (pad);
pad_length--;
}
return true;
}
hb_bytes_t dest_glyph = dest_start.copy (c);
hb_bytes_t end_copy = dest_end.copy (c);
if (!end_copy.arrayZ || !dest_glyph.arrayZ) {