Hi.
according to kp said on #unicode, I tried number of sets of matrix.
and unexpected behaviour found;
1. 1 0 0 1 default set and similar variable just make font variables without
rotation.
2. 1 0 0 -1 or -1 0 0 1 to flip by x or y axis, it really trouble.
nagitive element of matrix seems to make change on axis of whole text.
i.e. with y-flip matrix, glyph printed on above of textview.
so I can only one or two lines of pixel of the glyphs.
and I think that CRLF make line further up, not down as normal.
I suspect this is used for BiDi. but cannot sure.
3. 0 1 -1 0 for 90 degrees rotation also make trouble.
I cannot sure this case is differ from 2.
if the absence of vertical metric is matter, or not...
<match target="font">
<test name="family">
<string>GulimChe</string>
</test>
<!-- multiply the matrix to slant the font -->
<edit name="matrix" mode="assign">
<times>
<name>matrix</name>
<matrix>
<double>0</double><double>1</double>
<double>-1</double><double>0</double>
</matrix>
</times>
</edit>
</match>
was the configuration used.