🚀 go-pugleaf

The docs say that the following:
	xsize=GetDeviceCaps(hdc,HORZSIZE);
	ysize=GetDeviceCaps(hdc,VERTSIZE);
returns the dimensions of the physical display (mm).
How does it know these values for monitors????

First of all, who am I talking to when I call GetDeviceCaps?
The display driver?  Windows?

If I am talking to the display driver, does it return these values by:
    1. looking them up from a table in the driver
    2. asking the graphics card for the values
    3. computing them from the resolution of the card and the
       size of a single pixel.  If so, does it get the size of
       the pixel from:
	  (a) a table in the driver
	  (b) asking the graphics card for the values

I have a VGA Wonder and a NEC 3D.  When I use ATI's VSETUP program, I
can tell it that I have a NEC 3D.  Presumably VSETUP has a table of monitor
dimensions and sets that in the card's config table.  The Windows driver
can then ask the *card* how big the monitor is.  But what if I hook up
another monitor that VSETUP doesn't know about?  What then?

The size is returned correctly on my system, but
the values returned on a NEC 6G (*huge beast*) are incorrect (smaller
than they should be).  That system is running a #9 24-bit card
in 1280 X 1024 resolution.  When it was set up, there was no way to
tell the card which monitor was being used.

I would appreciate it if somone who knows driver internals could
poke around in the DDK for an answer.

-- 
John A. Grant						jagrant@emr1.emr.ca
Airborne Geophysics
Geological Survey of Canada, Ottawa