[Libreoffice-bugs] [Bug 107521] Improve DirectWrite implementation font rendering on Windows

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=107521

--- Comment #18 from Telesto <telesto at surfxs.nl> ---
Created attachment 136279
  --> https://bugs.documentfoundation.org/attachment.cgi?id=136279&action=edit
Xcode instruments time/leak profile and BT

(In reply to V Stuart Foote from comment #11)
> Rendering multiple text objects--especially cells in a Calc sheet when
> scrolling or resizing [1][2]--has slowed with default HA or CPU only
> rendering, though still reasonable with OpenGL.
> 
> Likely requires additional font caching of some kind.

Not sure if this is the read thread, but the slow scrolling problem seems to be
related to Harfbuzz (I would say). On MacOS at least.
Reference_table(hb_face_t*, unsigned int, void*) is leaking a little bit
(nearly not to mention) and consuming around 20% of the CPU time. I attached a
few screenshots and a BT. Based on bug 108574)

Note: there is new version of Harfbuzz available (1.5.1). Last bump was to
1.4.8 (bug 109142).

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