Test case "bitmap-font" broken

Hi Behdad,

thanks to Darxus, I started looking into the failure of the "bitmap-font" test.
This test uses the font "test/6x13.pcf" that is shipped with the test suite and
verifies its font extents.

I am writing to you, because the following commit made this test fail, according
to git bisect:

commit b94a519aad3d5b50aa6de47ee16ee6a099de9791
Author: Behdad Esfahbod <[email protected]>
Date:   Fri Dec 21 18:40:08 2012 -0500

    [ft] Fix resizing of bitmap fonts
[...]

The test expects font extents of e.g. ascent=11, descent=2, height=13. However,
since this commit, the reported font extents are ascent=8.46154,
descent=1.53846, height=10, as reported by test/output/bitmap-font.log. So all
values are off by a factor of 10/13.

I don't have much clue about this, but to me the file name sounds like this font
really should have a height of 13.

Since I don't have much clue about font handling, could you take a look and
hopefully come up with a fix for this (e.g. deciding that the new values are
correct and changing the test case for this)?

Thanks,
Uli
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