What do you think about the following point?
On Tue, 01 Jun 2010 10:16:08 +0900, YAMAMOTO
Mitsuharu<mituharu@math.s.chiba-u.ac.jp> said:
I'd rather suggest introducing some conversion functions between
relative and absolute coordinate systems. Newer versions of Mac OS
X provides "Resolution Independence" that allows users to specify a
scale factor:
http://developer.apple.com/mac/library/documentation/UserExperience/Conceptual/HiDPIOverview/HiDPIConcepts/HiDPIConcepts.html
With the scale factor, 1 pixel in the relative coordinate system no
longer always correspond to 1 pixel in the absolute one. Thus one
cannot determine the corresponding absolute coordinates only from
`inside-left' and `inside-top'.
(Maybe "pixel" above should be "unit".)
One can argue that the new API can return enough information to deal
with the scale factor by computing width and height in both relative
and absolute coordinate systems. But I guess many programmers just
tends to add some offsets for the conversion between these coordinate
systems. This might cause rewrite of elisp programs when GTK+
supports resolution independence in future.