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[ft-devel] Hinting paths
From: |
Nikolaus Waxweiler |
Subject: |
[ft-devel] Hinting paths |
Date: |
Sat, 31 Oct 2015 11:31:25 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
Hi List,
so I'm currently trying to figure out which hinting paths a glyph can
take from the perspective of fontconfig. So far I found:
TrueType:
- hintslight, autohint true/false: autohinter, fits to Y-axis
- hintmedium, autohint false: native, hintfull without X-fitting?
- hintmedium, autohint true: autohinter X-and-Y-fitting?
- hintfull, autohint false: native, X-and-Y-fitting or Y-fitting only
depending on the instructions in the font?
- hintfull, autohint true: stronger autohinter X-and-Y-fitting?
OpenType/CFF:
- hintslight, autohint true/false: autohinter, Y-fitting
- hintmedium == hintfull, autohint false: native, Y-fitting only
- hintmedium, autohint true: autohinter X-and-Y-fitting?
- hintfull, autohint true: stronger autohinter X-and-Y-fitting?
Type 1:
- hintslight, autohint true/false: autohinter, Y-fitting
- hintmedium, autohint false: low-quality Y-fitting
- hintmedium, autohint true: autohinter X-and-Y-fitting?
- hintfull, autohint false: slightly thinner low-quality Y-fitting?
- hintfull, autohint true: stronger autohinter X-and-Y-fitting?
So, questions:
- With autohint on, hintslight/medium/full do Y-fitting, X-and-Y-fitting
and stronger X-and-Y-fitting from within the autohinter *without any
"native hinting"*?
- With autohint off, what does hintmedium/full do for TrueType and Type1
fonts? Medium == full for CFF fonts?
My take-away from this is that in FT's current state, anything other
than hintslight or native medium == full for CFF fonts will lead to
distortion depending on the font and should be avoided.
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