Public bug reported:
The following Chromium Issue was reported on 2011-06-13:
"WenQuanYi Micro Hei" is rendered incorrectly on Linux
https://code.google.com/p/chromium/issues/detail?id=85890
with a screenshot that the Hangul glyphs were overlapping each other,
and hence unreadable.
Using FontTools/TTX for analysis, e.g. by running
ttx -x glyf -y 0 wqy-microhei.ttc
an XML file is generated, showing the following Horizontal Matrix table:
<hmtx>
...
<mtx name="uni9FC0" width="2048" lsb="104"/>
<mtx name="uni9FC1" width="2048" lsb="96"/>
<mtx name="uni9FC2" width="2048" lsb="104"/>
<mtx name="uni9FC3" width="2048" lsb="112"/>
<mtx name="uniAC00" width="256" lsb="128"/>
<mtx name="uniAC01" width="256" lsb="112"/>
<mtx name="uniAC02" width="256" lsb="112"/>
<mtx name="uniAC03" width="256" lsb="112"/>
<mtx name="uniAC04" width="256" lsb="112"/>
...
<mtx name="uniAC6E" width="256" lsb="72"/>
<mtx name="uniAC6F" width="256" lsb="72"/>
<mtx name="uniAC70" width="2048" lsb="88"/>
<mtx name="uniAC71" width="256" lsb="72"/>
<mtx name="uniAC72" width="256" lsb="72"/>
...
<mtx name="uniACA6" width="256" lsb="72"/>
<mtx name="uniACA7" width="256" lsb="72"/>
<mtx name="uniACA8" width="2048" lsb="88"/>
<mtx name="uniACA9" width="256" lsb="72"/>
<mtx name="uniACAA" width="256" lsb="72"/>
...
<mtx name="uniD7A1" width="256" lsb="168"/>
<mtx name="uniD7A2" width="256" lsb="168"/>
<mtx name="uniD7A3" width="256" lsb="168"/>
<mtx name="uniF900" width="256" lsb="136"/>
<mtx name="uniF901" width="2048" lsb="104"/>
<mtx name="uniF902" width="2048" lsb="104"/>
<mtx name="uniF903" width="256" lsb="168"/>
<mtx name="uniF904" width="256" lsb="88"/>
<mtx name="uniF905" width="2048" lsb="216"/>
<mtx name="uniF906" width="2048" lsb="128"/>
<mtx name="uniF907" width="2048" lsb="96"/>
<mtx name="uniF908" width="2048" lsb="96"/>
<mtx name="uniF909" width="256" lsb="80"/>
<mtx name="uniF90A" width="2048" lsb="80"/>
<mtx name="uniF90B" width="256" lsb="160"/>
<mtx name="uniF90C" width="256" lsb="104"/>
<mtx name="uniF90D" width="256" lsb="80"/>
<mtx name="uniF90E" width="2048" lsb="72"/>
<mtx name="uniF90F" width="256" lsb="96"/>
<mtx name="uniF910" width="256" lsb="128"/>
<mtx name="uniF911" width="256" lsb="128"/>
...
<mtx name="uniFA25" width="2048" lsb="96"/>
<mtx name="uniFA26" width="256" lsb="104"/>
<mtx name="uniFA27" width="256" lsb="88"/>
<mtx name="uniFA28" width="256" lsb="88"/>
<mtx name="uniFA29" width="256" lsb="168"/>
<mtx name="uniFA2A" width="2048" lsb="80"/>
<mtx name="uniFA2B" width="256" lsb="80"/>
<mtx name="uniFA2C" width="2048" lsb="80"/>
<mtx name="uniFA2D" width="256" lsb="48"/>
...
</hmtx>
Apparently, WenQuanYi Micro Hei uses a horizontal advance width of 2048
for CJK characters by default, e.g.:
<mtx name="uni9FC0" width="2048" lsb="104"/>
<mtx name="uni9FC1" width="2048" lsb="96"/>
<mtx name="uni9FC2" width="2048" lsb="104"/>
<mtx name="uni9FC3" width="2048" lsb="112"/>
whereas DroidSansFallback.ttf uses a horizontal advance width of 256 for
CJK characters by default.
Perhaps something went wrong when the Hangul (and related Korean Han
fallback glyphs) from DroidSansFallback.ttf were merged into WenQuanYi
Micro Hei?
** Affects: chromium-browser
Importance: Unknown
Status: Unknown
** Affects: ttf-wqy-microhei (Ubuntu)
Importance: Undecided
Status: New
** Affects: ttf-wqy-microhei (Debian)
Importance: Unknown
Status: Unknown
** Bug watch added: Debian Bug tracker #714641
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714641
** Also affects: ttf-wqy-microhei (Debian) via
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714641
Importance: Unknown
Status: Unknown
** Bug watch added: code.google.com/p/chromium/issues #85890
http://code.google.com/p/chromium/issues/detail?id=85890
** Also affects: chromium-browser via
http://code.google.com/p/chromium/issues/detail?id=85890
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1258520
Title:
Hangul glyphs in "WenQuanYi Micro Hei" overlap one another in Chromium
(incorrect advanceWidth in hmtx table)
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