[Bug 159529] Excessive memory consumption in v24.2

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=159529

--- Comment #19 from Patrick Luby <guibomac...@gmail.com> ---
OK. I found where the huge 'sbix' font table is being cached: hb_face_t->sbix
in HarfBuzz's src/OT/Color/sbix/sbix.hh file. Note: hb_face_t->sbix is an
instance of accelerator_t held by a hb_face_lazy_loader:

    accelerator_t (hb_face_t *face)
    {
      table = hb_sanitize_context_t ().reference_table<sbix> (face);
      num_glyphs = face->get_num_glyphs ();
    }
    ~accelerator_t () { table.destroy (); }

In theory, maybe the above class can be restructured to only fetch the 'sbix'
font table when needed and immediately destroy it after use.

Anyone have any better ideas? Rewriting most of the HarfBuzz file sounds like a
lot of work and may introduce a bunch of new bugs.

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