[WINTCL] tk WidthMMOfScreen discussion

[Josef G. <jo...@gm...>]

I am not very familiar with the tcl/tk source code, please bear with
me. I am using Windows7 Sp1, python 2.7, tk 8.5 on a laptop with no
attached display.
The screen specifications are 280 mm. The screen physically measures
275 mm (close enough). I have manually checked and written a script to
check screen EDID. The EDID states 280 mm. winfo_screenmmwidth reports
361 mm.

I tracked the winfo_screenmmwidth command down to TK_GetScreenMM in
tkGet.c. Tk_GetScreen calls WidthMMOfScreen, which only seems to be
defined in Xlib.h as a macro(?) method for retrieving data from the
Screen struture. How is the Screen structure, specifically mwidth,
extracted in Windows7? Is there a registry call for the current
display's EDID?

Thank you in advance,

Josef