[Libreoffice-bugs] [Bug 118221] Calc fails to render kerning=off (default setting) for single-line cells, only works during cell edit mode [F2] (affects screen, paper and PDF) [Comment 15]

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=118221

--- Comment #27 from Eike Rathke <erack at redhat.com> ---
(In reply to OfficeUser from comment #25)
> @Stuart:
> > "Suspect flushing all cell content through edit engine just to provide layout kerning is going to impose considerable performance drag.
> 
> Are there any values for a performance degrade available if using EditEngine
> always?
I did a short stress testing right now, =1 formulas in narrow (optimal width)
columns to have as many columns as possible to paint filling a screen width,
5000 rows, jump to end, hold PageUp to scroll to row 1: takes 5 seconds;
compiled to force EditEngine takes 30 seconds.

> > What might be possible is for non-EditEngine cells tell OutputDevice to force kerning off via SalLayoutFlags::DisableKerning (I didn't track how exactly we call OutputDevice draws there).
> 
> Is this possible to change per character? We need to keep in mind that we
> are talking of a character attribute (like bold, underlined, ...).

As said in my previous comment, for inline formatted content (i.e. per
character attribution) already EditEngine text is used.

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