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[ft-devel] autohinting and spacing

From: Graham Asher
Subject: [ft-devel] autohinting and spacing
Date: Wed, 8 Aug 2007 11:43:15 +0100

Hi everybody - here is a problem that I am trying to solve myself, but which
may very well have been solved already, or at least someone might have an
idea about it.

Autohinting seems to make the space between letters wrong in many cases. I
attach a small picture showing the letters "mp" in DejaVu Serif Bold at 16
ppem, rendered using the grey-scale rasterizer, with no hinting above and
auto-hinted below. The spacing is clearly wrong in the autohinted version.

This is very probably caused by bugs in the part of af_loader_load_g() in
afloader.c that adjusts side bearings after auto-hinting has been done.

Suggestions welcome.

Best regards,

Graham Asher

Attachment: autohint-spacing.bmp
Description: Windows bitmap

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