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Re: [ft-devel] ftgrays - exact pixel coverage?
From: |
Werner LEMBERG |
Subject: |
Re: [ft-devel] ftgrays - exact pixel coverage? |
Date: |
Thu, 09 Feb 2012 05:36:20 +0100 (CET) |
>> I believe there is discrepancy between what's written in ftgrays.c
>> and its actual functioning. It is said it "computes the _exact_
>> coverage of the outline on each pixel cell". But the following
>> program shows this is not true.
Good point! Thanks for reminding us. Consequently, I think that...
> To speed up the rendering ftgrays flattens the curves, i.e., it
> renders them as short straight segments. This explains your
> observation. Note that the statement is still true for straight
> segments.
... this deserves a comment in the code (near the word `exact' :-).
Alexei, can you prepare something?
Werner