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Re: [ft-devel] loss of precision in FT_Outline_Decompose
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From: |
Behdad Esfahbod |
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Subject: |
Re: [ft-devel] loss of precision in FT_Outline_Decompose |
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Date: |
Tue, 16 Jul 2013 09:59:44 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130623 Thunderbird/17.0.7 |
On 13-07-16 09:35 AM, Werner LEMBERG wrote:
>
>>> At two places in FT_Outline_Decompose there is a division by 2 that
>>> loses one bit of precision. [...]
>>>
>>> I was doing some tests generating outlines of fonts and come upon
>>> this because the .eps I generated were slightly different but gave
>>> apparently the same image.
>>>
>>> Is this loss of precision a problem or will it never be seen in an
>>> image?
>
> AFAIK, it is not a problem, given that we work with 1/64th of a pixel.
Oh, I see. Doesn't matter then.
>> Would be nice to fix regardless.
>
> Suggestions? I think it's not worth the trouble, but maybe there are
> special use cases which I'm not aware of.
I was thinking about unscaled outline, but even if we are losing a bit there,
that's pretty unavoidable given the upem of the font.
--
behdad
http://behdad.org/