[Fontconfig-bugs] [Bug 87122] New: Treat color bitmap font as scalable

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87122

            Bug ID: 87122
           Summary: Treat color bitmap font as scalable
           Product: fontconfig
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: fc-scan
          Assignee: fontconfig-bugs at lists.freedesktop.org
          Reporter: jungshik.shin at gmail.com

Blink blocks all the non-scalable fonts), color or not. Currently, fontconfig
treats any bitmap font as non-scalable.

As a result, Blink (used by Chrome and Opera) rejects color fonts in Google's
proposed color bitmap font format (such as Noto Color Emoji). 

By treating color bitmap fonts as scalable, we can get 'Noto Color Emoji' and
other color fonts in the same format to be accepted by Blink. 

An alternative is to change fontconfig to introduce 'FC_COLOR' and let clients
such as Blink accept color fonts (bitmap or not). My patch for that is
http://goo.gl/rDRffN

In the meantime, fontconfig on ChromeOS uses  the following addition to
local.conf to treat Noto Color Emoji as scalable.  See
http://crbug.com/386772#c15 

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>

  <match target="scan">
    <test name="family">
      <string>Noto Color Emoji</string>
    </test>
    <edit name="scalable" mode="assign">
      <bool>true</bool>
    </edit>
  </match>

  <match target="pattern">
    <test name="prgname">
      <string>chrome</string>
    </test>
    <edit name="family" mode="prepend_first">
      <string>Noto Color Emoji</string>
    </edit>
  </match>

</fontconfig>

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