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Re: [ft-devel] regarding freetype 2 cubic curve flattening

From: Alexei Podtelezhnikov
Subject: Re: [ft-devel] regarding freetype 2 cubic curve flattening
Date: Mon, 31 Oct 2011 08:27:31 -0400

Hi All,

I finally understand where Vivek is coming from. There is a temptation
to tolerate deviations larger than ONE_PIXEL on long arches that may appear
with larger font sizes (say, 24 pixels or more). Sure, they'll look
smooth (not angular).
We are not about smoothness though. We need correct pixel-by-pixel shape.
Therefore, we *always* tolerate a constant fraction of ONE_PIXEL no matter
how long the arch is.


On Mon, Oct 31, 2011 at 7:51 AM, Alexei Podtelezhnikov
<address@hidden> wrote:
> On Mon, Oct 31, 2011 at 7:43 AM, Vivek Rathod <address@hidden> wrote:
>> The formula for deviation ( from Hein's paper).
>> d = dnorm * s ; here s is normalized ------------------- (1)
>> so the formula when s is not normalized becomes d = dnorm * (s / L)  ;
>> -----------------(2)
>> and I think the L you are mentioning comes from this formula.
>> therefore s = (dmax/dnorm) * L;
>> Please correct me if I am wrong about this whole normalization assumption.
> Stop confusing yourself and everybody else!
> Do you know what ONE_PIXEL is? Learn that and read the damn code!
> ONE_PIXEL is an absolute value and does not need any damn normalization.

Alexei A. Podtelezhnikov, PhD

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