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[Anthony Fok <foka@xxxxxxxxxx>]

** No longer affects: chromium-browser

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

Bug description:
  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?

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