RE: [fltk.general] Overlapping lines [General Use]

[MacArthur, Ian (Leonardo, UK)]

Michael,

Did you raise an STR for this?
And if not, can you, please?

Looks like a good catch, though maybe tricky to resolve, since it will likely depend on the font selected and how the Xserver is interpreting hinting... Awkward to cope with, I suspect...


> On some systems in the Fl_Text_Editor widget it seems that the lines
> overlap by one pixel. If the text contains '_' (underscore) characters
> they are not visible with the default font size.
>
> Setting the font size much larger from the application works as
> workaround (and proves that the invisible characters are really there).
>
> The reason for this behaviour seems to be the font hinting of Xft.
> Setting the X ressources as follows solves the problem:
> |
> | Xft.antialias: true
> | Xft.hinting: true
> | Xft.autohint: false
> | Xft.hintstyle: hintfull
>
> This X ressources should make the problem visible on systems that work
> correctly by default:
> |
> | Xft.antialias: true
> | Xft.hinting: true
> | Xft.autohint: false
> | Xft.hintstyle: hintslight
> ^^^^^^^^^^
> I found this notice that GNOME modifies this setup:
> <https://wiki.archlinux.org/index.php/Font_Configuration#Hintstyle>
> so whether the problem occurs should not depend on the operating
> system but on the desktop environment used.
>
>
> How to reproduce:
> - Operating system should not matter but must use X11
> - Ressources set in the X-Server as listed above
> - FLTK compiled to use X11 and Xft
> - Test program for Fl_Text_Editor is sufficient
> - Type some text that contain '_' (underscore) characters
>
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[Michael Bäuerle]

MacArthur, Ian wrote:
>
> Did you raise an STR for this?

I have posted the article first because maybe this is a known problem.

> And if not, can you, please?

OK, looks like it's not.

> Looks like a good catch, though maybe tricky to resolve, since it
> will likely depend on the font selected and how the Xserver is
> interpreting hinting... Awkward to cope with, I suspect...

Now filed as STR #3321. Please adjust priority as appropriate.