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tuningfonts: Update details about hinting.

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A lot of the information which shows up in google, particularly from
Arch users, is for using the Infinality True Type interpreter. Let
people read the history from FreeType.

Also confirm, from a posting this month, that medium hinting is broken.
This commit is contained in:
Ken Moffat 2023-11-25 02:20:45 +00:00
parent 9d8ea2319b
commit f98db52327
1 changed files with 28 additions and 2 deletions
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30
x/installing/tuning-fontconfig.xml
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@ -420,7 +420,7 @@ cat > ~/.config/fontconfig/fonts.conf << "EOF"
hintfull: is supposed to give a crisp font that aligns well to the
character-cell grid but at the cost of its proper shape.
hintmedium: poorly documented, maybe a synonym for hintfull.
hintmedium: is reported to be broken.
hintslight is the default: - supposed to be more fuzzy but retains shape.
hintnone: seems to turn hinting off.
@ -442,9 +442,25 @@ cat > ~/.config/fontconfig/fonts.conf << "EOF"
EOF</userinput></screen>
<para>
You will now need to edit the file in your preferred editor.
You will now need to edit the file in your preferred editor. Many of the
different settings give very subtle differences and the results may differ
for some of the fonts you use.
</para>
<note>
<para>
Hinting, if enabled, is done in <application>FreeType</application>.
Since FreeType-2.7 the default TrueType interpreter is v40. The
original v35 hinter could be enabled by an environment variable, but
is only really appropriate to original Microsoft TTF fonts (Arial, etc).
The v38 hinter (Infinality) is not built by default and all the options
to tune it have been removed. For full details see <xref
linkend="subpixel-hinting"/> (Spoiler: there is NO sub-pixel hinting,
the code simply ignores <emphasis>all</emphasis> horizontal hinting
instructions.
</para>
</note>
<para>
For more examples see the blfs-support thread which started at <ulink
url="https://lists.linuxfromscratch.org/sympa/arc/blfs-support/2016-09/msg00128.html">2016-09/00128</ulink>,
@ -844,6 +860,16 @@ EOF</userinput></screen>
non-MS Japanese fonts when an ugly MS font is already installed.
</para>
<bridgehead renderas="sect3" id="subpixel-hinting"
xreflabel="subpixel-hinting">subpixel-hinting</bridgehead>
<para>The documentation of the FreeType v40 interpreter at <ulink
url="https://freetype.org/freetype2/docs/hinting/subpixel-hinting.html">freetype
docs</ulink>
explains how the current hinter works, and why the previous (slow) Infinality
interpreter was replaced.
</para>
<bridgehead renderas="sect3" id="arch-fontconfig"
xreflabel="Fontconfig in the Arch wiki">Fontconfig in the Arch wiki</bridgehead>