[cairo] rotated characters does not keep baseline
spitzak at d2.com
Thu Apr 5 03:51:37 PDT 2007
Behdad Esfahbod wrote:
>> During some (unrelated directly) discussions on the list I have learned that
>> the effect can be due to glyph cache, that stores only single image of a letter
>> that is later reused. This seems to be wrong in any (metrics-)unhinted mode
>> (rotated or not).
> True. We don't have a plan to fix it right now. Any ideas?
Cache renderings at subpixel positions. I would think a 4x4 grid of
subpixel positions would be sufficient. Probably more important than for
rotated text, this will allow non-integer escapement of characters which
would greatly improve non-hinted horizontal text. I would think this may
also be necessary to correctly compose glphs even when hinting is on.
Hinting will probably round all escapements to an integer, and probably
should do this for rotated text as well, rounding the *larger* of the
two to an integer and scaling the other one by the same factor. Then
hinted slanted text would use fewer variations on the glyphs but (i
hope) enough to make the line look straight.
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