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[Anthony Fok <foka@xxxxxxxxxx>]

** Changed in: ttf-wqy-microhei (Ubuntu)
       Status: New => Confirmed

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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)

Status in “ttf-wqy-microhei” package in Ubuntu:
  Confirmed
Status in “ttf-wqy-microhei” package in Debian:
  New

Bug description:
  Hangul glyphs stack on top of one another, and hence unreadable,
  especially in Chromium browser.

  See:

  * https://code.google.com/p/chromium/issues/detail?id=85890
      "WenQuanYi Micro Hei" is rendered incorrectly on Linux (2011-06-13)

  * https://sourceforge.net/p/wqy/bugs/42/
      WenQuanYiMicroHei hangul advance
      (an anonymous user reported the problem upstream on 2013-03-29)

  * https://code.google.com/p/chromium/issues/detail?id=233851
      korean fonts stacking vertically onto eachother and/or replaced with pinyin
      after updating to linux raring ringtail 13.04  (2013-04-19)

  * http://bugs.debian.org/714641
      ttf-wqy-microhei: Incorrect advanceWidths in hmtx for composite glyphs.
      (with a suggested fix)

  
  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?

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