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[ft-devel] Autohinter, Cantarell-Regular, 14ppem: dot on i and j on diff

From: Nikolaus Waxweiler
Subject: [ft-devel] Autohinter, Cantarell-Regular, 14ppem: dot on i and j on different grids, ascenders of d not snapped to zone
Date: Wed, 6 Jan 2016 23:54:04 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Hey list,
Please have a look at at 14ppem with the light autohinter. Since this is an .otf and you can't force the autohinter in light rendering mode (bug), temporarily apply the attached patch to FT and use "LD_PRELOAD=objs/.libs/ ftview 14 Cantarell-Regular.otf" and press "B" to get light autohinting. 14ppem just so happens to be the standard UI font size in GNOME3.

The dot on the i and j are snapped to different heights and the ascender of 'd' doesn't seem to be snapped. Annoying in a word like "border" where the snapped heights of bd don't match.

I actually noticed similar snapping differences in a few other fonts at times, e.g. Georgia at 56px (JUN vs. KST). Is this a bug in the autohinter?

Attachment: ft-fautohint.patch
Description: Text Data

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