Hello:
Pardon me if this is not the proper venue
to post this issue. I did not know where
else to start.
I am using the Qt (Trolltech/Nokia) toolkit
to write C++ applications on the Linux/X11 platform.
BUT, all text appears to be improperly spaced.
The line spacing is too large.
Upon examination the ascent and descent
font metrics appear to be ~50% too large.
I grew up with the understanding that ascent
was typically the distance from the base-line to the top
of the lower case 'd' character and the descent
was typically the distance from the base-line
to the bottom of the lower case 'y' character.
You add a little leading and you have the line-spacing.
There is a nice picture here:
http://developer.apple.com/documentation/Cocoa/Conceptual/FontHandling/Tasks/GettingFontMetrics.html
But, the font metrics from Qt show ascent and descent
numbers which are typically 50% larger than this
resulting in visually unacceptable text spacing.
This does not appear to be a Qt-only problem
as I have also observed the same over-spacing
in applications written with the wxWidgets toolkit.
Qt tech-support blames the X11 layers (FontConfig, Truetype etc.)
for providing incorrect font metrics.
Is this true or are they misinterpreting the numbers?
It is hard to believe that 20+ years after the invention
of X11 that there are still font problems.
How do I fix this problem (at a low level) so that
text looks properly spaced in my applications?
Thanks in advance.
Bill
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