display-mm-height for MacOS?

[David Kastrup]

People are trying out preview-latex, and it would appear that the
size calculations fail utterly.

preview-latex creates bitmaps to fit in well with the screen.  It uses
display-mm-height and display-pixel-height for calculating the
resolution of the screen, and then takes the point size of the default
font to make a guess how large the font is in reality.  This then gets
transformed into pixels, and the resulting images should match up
fine.

Or so is the theory, and the way stuff works under X.

On MacOS, it would appear that this results in awfully large images,
so one of the three above stated dimensions would seem to be quite
wrong.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum