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[ft-devel] Re: [ft] Bytecode hinter producing bad results, seems to be a

From: Werner LEMBERG
Subject: [ft-devel] Re: [ft] Bytecode hinter producing bad results, seems to be a regression
Date: Fri, 21 Jan 2011 19:35:06 +0100 (CET)

[About B/W hinted rendering of the font `Helvetica Neue LT Com 65

> I was testing this on 96dpi, with smoothing turned off entirely (if
> enabled, there's the option between 'standard' and 'cleartype').
> I've attached the image for the font you supplied.

With the help of Greg Hitchcock from Microsoft I was able to fix some
`bugs' in the FreeType raster and bytecode engine.  Regarding the
rasterizer, the MS people have implemented some special handling of
border cases which aren't documented (drop-out pixels outside of the
bbox are moved into the bbox; the bbox for B/W rasterizing is computed
using ordinary rounding, not flooring and ceiling), and within the
bytecode engine, there is an error in the specification of the MIRP

There are still some differences I have yet to analyze, but in most
cases the output is identical now.

However, if you ignore the `gasp' table and instead rasterize this
font at the particular ppem values with the grayscale renderer (while
hinting is active), the results are still extremely bad.  This can't
be fixed.


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