Ok, here's my proposed 00-scale-bitmap-fonts.conf:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<match target="font">
<test name="scalable" compare="eq">
<bool>false</bool>
</test>
<edit name="patternpixelsize" mode="assign">
<name target="pattern">pixelsize</name>
</edit>
<edit name="pixelsizefixupfactor" mode="assign">
<divide>
<name>patternpixelsize</name>
<name>pixelsize</name>
</divide>
</edit>
</match>
<match target="font">
<test name="scalable" compare="eq">
<bool>false</bool>
</test>
<edit name="scalingnotneeded" mode="assign">
<and>
<less>
<name>pixelsizefixupfactor</name>
<double>1.2</double>
</less>
<more>
<name>pixelsizefixupfactor</name>
<double>0.8</double>
</more>
</and>
</edit>
</match>
<!--
So far we determined the scale factor. Now, check and if
scaling is NOT desirable, just reset the scale factor to 1.0.
-->
<match target="font">
<test name="scalable" compare="eq">
<bool>false</bool>
</test>
<test name="patternpixelsize" compare="less">
<double>64</double>
</test>
<test name="hinting" compare="eq">
<bool>true</bool>
</test>
<test name="scalingnotneeded" compare="eq">
<bool>true</bool>
</test>
<edit name="pixelsizefixupfactor" mode="assign">
<double>1.0</double>
</edit>
</match>
<!--
If we *are* going to scale, go ahead and do it.
-->
<match target="font">
<test name="scalable" compare="eq">
<bool>false</bool>
</test>
<test name="pixelsizefixupfactor" compare="not_eq">
<double>1.0</double>
</test>
<edit name="matrix" mode="assign">
<times>
<name>matrix</name>
<matrix>
<name>pixelsizefixupfactor</name> <double>0</double>
<double>0</double> <name>pixelsizefixupfactor</name>
</matrix>
</times>
</edit>
<edit name="size" mode="assign">
<divide>
<name>size</name>
<name>pixelsizefixupfactor</name>
</divide>
</edit>
</match>
</fontconfig>
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