I noticed a problem when I render a true type font.

 

All gyphs in the font have a fixed width of 550 font units. Its EM size
is 1024. So at 29.5 points and 600 dpi, all glyphs should have a width
of 132 dots, according to:

 

29.5*550/(72*1024) = 0.22 (inch) * 600 = 132.

 

Unfortunately I got different results from 98 dots to 132 dots -quite a
wide range. 

 

What may cause the problem? The width is quite important for the
results. Is there any way I can work around the issue?

 

Thanks!

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