improve font caching in SwFntObj

The code previously cached only SalGlyphItems, but such caching
fails if SalLayout::GetGlyphs() does not return valid glyphs,
which is the case with MultiSalLayout. Worse, it not only fails,
but layout is once computed for caching, that fails, and is computed
a second time for actual use.

This improved cache caches the result of GetTextWidth(), which
itself improves the performance a bit, but it also allows caching
the value for GetGlyph() not returning valid glyphs. Moreover this
also caches failures to get valid glyphs from GetGlyphs().

There are quite some calls to GetTextArray(), I didn't cache those,
but it might be added if needed.

Change-Id: Ia2589fb1b778f4f154c88f65d9906584284239da
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112588
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

0 files changed, 0 insertions, 0 deletions