Erik,
there are at least two serious problems if FreeType gets compiled with
subpixel hinting
. B/W rendering sucks. Attached you can find two images, with and
without subpixel hinting, showing the font arial.ttf, version
5.06. I've simply called
ftview 15 arial.ttf
and pressed the `a' key to toggle anti-aliasing off. According to
the `gasp' table, this font must be rendered B/W at 15 ppem, so
enabling subpixel hinting must not prevent the original hinting
instructions if switching to bi-level rendering.
. Subpixel hinting causes an extreme slowdown. Running ftbench with
arial.ttf, I get
Load : 50.875 us/op
Load_Advances (Normal) : 50.945 us/op
vs.
Load : 724.595 us/op
Load_Advances (Normal) : 723.306 us/op
Loading the font is more than 14 times slower!
Before enabling subpixel hinting by default, these issues *must* be
addressed.
Werner
<<inline: arial.15.bilevel.no-subpixel-hinting.png>>
<<inline: arial.15.bilevel.subpixel-hinting.png>>
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