[Lazarus] Detecting anomalous DPI

[Mark Morgan Lloyd]

I've just been rereading the recent discussion on Hi-DPI, and the 
relevant bits of the Wiki.

I've got a user with eyesight problems, who put a 48" TV on his desk as 
a monitor to a Linux system with KDE. Then he set the "Force fonts DPI" 
setting to something like 200, this increases the text size enormously 
but- obviously- messes up layout.

Is there any way that a standard application can pick up that an 
anomalous setting is being used? Screen.PixelsPer Inch is still 96, 
ditto for Screen.SystemFont.Pixels, Screen.SystemFont.Size is zero.

I'm not looking for a fix at this point, which I presume will be 
provided by the Hi-DPI support. But it would be very useful if a program 
could log the /actual/ DPI for support purposes.

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]