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Documentation: discuss HighDPI support under Windows and app manifests.

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2021-12-12 15:48:08 +01:00
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@@ -583,6 +583,17 @@ DrawSomething(fl_gc, ..., fl_brush());
It may also be useful to refer to Fl_Window::current()
to get the window's size or position.
\subsection osissues_windows_highdpi HighDPI support
FLTK apps for the Windows platform are by default "Per-monitor DPI-aware V2".
This means that any window automatically adjusts its physical size
in relation to the scaling factor of the display where it maps.
This also means that all drawings (e.g., text, lines, images)
take advantage of the full resolution of the display in use.
FLTK apps may also use the manifest mechanism
to declare their level of DPI awareness. The FLTK library
adapts to the DPI awareness level set in the app's manifest, which can be lower
than the default level if the manifest sets it so.
\subsection osissues_windows_scaling Display Scaling Factor
FLTK uses the value given by function GetDpiForMonitor() divided by 96.