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* Add text support. For reference, here are the text-related PS
operators:
Probably needed
---------------
charpath
findfont
setfont
show
scalefont
transformfont (not in postscript)
Perhaps needed?
===============
Relative Offsets
----------------
ashow show with x/y displacement added to each character
widthshow show with x/y displacement added to specified character
awidthshow same as ashow plus widthshow
glyphshow show with name-based rather than encoded lookup of glyph
cshow show with a callback for drawing each glyph
kshow show with a callback between drawing each glyph
Absolute offsets
----------------
xyshow show with array of x/y displacements substituted
xshow same as xyshow with y==0
yshow same as xyshow with x==0
rootfont
currentfont
stringwidth
Probably not needed
-------------------
definefont
composefont
undefinefont
makefont
selectfont
FontDirectory
GlobalFontDirectory
StandardEncoding
ISOLatin1Encoding
findencoding
setcachedevice
setcachedevice2
setcharwidth
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