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Re: [ft-devel] FreeType sub-banding


From: Werner LEMBERG
Subject: Re: [ft-devel] FreeType sub-banding
Date: Fri, 08 Jul 2016 06:49:23 +0200 (CEST)

> You might have noticed my commit
> http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=4a2f8f1faffd7aad7a8cb3be196abc49e4b227da

Yeah, thanks for working on it!

> FreeType smooth rasterizer is incredibly smart in setting the
> default band size at 1/8th of the available pixel (cell) pool.  This
> minimizes having memory overflown, band bisected and work repeated.
> That magic constant is only suitable for rather simple European
> scripts.  Chinese ideogram would be more comfortable with smaller
> default band size like 1/13th the available pixel pool.  I did the
> statistics.

Interesting.  Are we really talking about noticeable differences in
rendering speed?

> Any suggestions? Should rasterizer be aware of the Unicode range?

I would rather not follow that path since this opens a can of worms.
Maybe using a compromise of using 1/10th?


    Werner



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