>> Here's another recipe to see the artifact even better (I'm using
>> msmincho.ttc from Windows 7):
>>
>> ftgrid -f 4420 19 msmincho.ttc
>>
>> (value 4420 is the glyph index of U+56DB in this font). After
>> pressing key `a', a vertical line on the left is missing in the
>> outline. Interestingly, this happens at 100% zooming only.
>
> This is a typical dropout situation. [...] I am actually surprised
> that this does not happen more often. The left edge line happens to
> cover two adjacent pixels at less than 50%, which is also
> surprising. Deep inside, this is probably a stroker rounding issue.
Interesting. Can you investigate this in more detail?
Werner
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