Re: subpixel text rendering on Linux

On Thu, 29 Sep 2022 22:15:19 +0200
Francesco Abbate <[email protected]> wrote:

>Dear Jeroen,
>
>I have another question completely unrelated to the previous one.
>
>I noticed that on Linux the FOX library draws the text using grayscale
>rendering irrespective of the text rendering setting of the host system,
>for example GNOME.

Are you talking about "ClearType" or whatever they're calling it on the
linux desktop?

I don't know how the font system will react to a change the sub-pixel 
rendering mode.  FYI, I have turned on mine, and also set custom rez
so pitch sizes match more closely.

>That happens using the Xft option that I use now by default.

Its possible that some of these changes only take effect after a reboot;
or at least a restart of your desktop.  Because I believe glyphs are
cached and may need to be regenerated after such a change.

>My question is, why is grayscale smoothing always used and is there any way
>to align the text rendering with the host system or, in alternative, to
>force subpixel smoothing ?

You are probably correct, in that FOX does not seem to follow the sub-pixel
rendering hint.  I don't know if there's a flag for this I need to use to
enable it.  We're using Xft/fontconfig so I figure it would be on, but maybe
I'm wrong about that...

>To put this in perspective: the FOX library looks quite fine on Windows
>where the text rendering is done like a native application but on Linux the
>FOX applications looks out of place and one of the reasons is that text
>rendering clashes with those of native applications because of the
>grayscale.

If anyone has suggestions please let me know...


		-- JVZ


-- 
+----------------------------------------------------------------------------+
| Copyright (C) 17:30 09/29/2022 Jeroen van der Zijp.   All Rights Reserved. |
+----------------------------------------------------------------------------+

_______________________________________________
Foxgui-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/foxgui-users