[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [ft-devel] GX support now working

From: Dave Arnold
Subject: Re: [ft-devel] GX support now working
Date: Mon, 22 Jun 2015 15:15:17 -0700
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

Hi Werner,

On 6/8/2015 2:20 AM, Werner LEMBERG wrote:
Adobe rasterizers typically use even-odd at small sizes and non-zero
at larger sizes.
Interesting.  What's the rationale for that?  And which ppem values
are `small sizes'?  I would also like to know whether this is a
general thing, independent of the font format (i.e., TrueType
vs. PostScript outlines).
I've checked around at Adobe, and find that my memory is incorrect. The small 
sizes are non-zero and the large sizes are even-odd.

The threshold is 400 ppem. Below that size, a "center scan" algorithm is used. 
It is a newer algorithm than the original scan converter and produces better results. But 
it runs slower and takes more memory, so the original is still used at large sizes.

The TrueType rasterizer that Adobe licenses from Microsoft has its own scan 



reply via email to

[Prev in Thread] Current Thread [Next in Thread]