organicmaps/harfbuzz
13
Fork 0
mirror of https://github.com/harfbuzz/harfbuzz.git synced 2025-04-13 08:42:59 +00:00
Code Issues 1 Projects Releases Wiki Activity Actions 7

[glyf] Reduce malloc pressure

Browse source 
Benchmark 15% faster for draw.
This commit is contained in:
Behdad Esfahbod 2025-02-25 16:59:37 -07:00
parent 882d328839
commit 7614320a13
1 changed files with 36 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
src/OT/glyf/glyf.hh
View file

@ -198,6 +198,13 @@ struct glyf_accelerator_t
}
~glyf_accelerator_t ()
{
auto *scratch = cached_scratch.get_relaxed ();
if (scratch)
{
scratch->~hb_glyf_scratch_t ();
hb_free (scratch);
}
glyf_table.destroy ();
}
@ -463,10 +470,34 @@ struct glyf_accelerator_t
bool
get_path (hb_font_t *font, hb_codepoint_t gid, hb_draw_session_t &draw_session) const
{
hb_glyf_scratch_t scratch;
return get_points (font, gid, glyf_impl::path_builder_t (font, draw_session),
hb_array (font->coords, font->num_coords),
scratch); }
if (!has_data ()) return false;
hb_glyf_scratch_t *scratch;
// Borrow the cached strach buffer.
{
scratch = cached_scratch.get_acquire ();
if (!scratch || unlikely (!cached_scratch.cmpexch (scratch, nullptr)))
{
scratch = (hb_glyf_scratch_t *) hb_calloc (1, sizeof (hb_glyf_scratch_t));
if (unlikely (!scratch))
return true;
}
}
bool ret = get_points (font, gid, glyf_impl::path_builder_t (font, draw_session),
hb_array (font->coords, font->num_coords),
*scratch);
// Put it back.
if (!cached_scratch.cmpexch (nullptr, scratch))
{
scratch->~hb_glyf_scratch_t ();
hb_free (scratch);
}
return ret;
}
bool
get_path_at (hb_font_t *font, hb_codepoint_t gid, hb_draw_session_t &draw_session,
@ -489,6 +520,7 @@ struct glyf_accelerator_t
unsigned int num_glyphs;
hb_blob_ptr_t<loca> loca_table;
hb_blob_ptr_t<glyf> glyf_table;
hb_atomic_ptr_t<hb_glyf_scratch_t> cached_scratch;
};