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Wayland.dox: add "Fractional scaling" paragraph

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ManoloFLTK 2023-04-08 21:08:19 +02:00
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documentation/src/wayland.dox
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@ -518,6 +518,18 @@ that scales the graphics driver by this factor with \c cairo_scale().
Overall, an FLTK object, say an Fl_Window, of size \c WxH FLTK units occupies
<tt>W * wld_scale * gui_scale x H * wld_scale * gui_scale</tt> pixels on the display.
<h3>Fractional scaling</h3>
The KDE compositor, and gnome too if specially set, allow to use <em>fractional scaling</em>
that can take values between 100% and 200%. Wayland implements this rendering all
<tt>wl_surface</tt>'s as if the scaling was at 200%, and downsizing them
to the desired fractional scale value at the compositing stage.
Seen from FLTK, everything runs as when <tt>wld_scale = 2</tt>. These commands make gnome
accept fractional scaling, and turn that off:
\code
gsettings set org.gnome.mutter experimental-features "['scale-monitor-framebuffer']"
gsettings reset org.gnome.mutter experimental-features
\endcode
\section wayland-mouse Mouse and trackpad handling