[pdftex] how to include literal commands into vpl files

[Ulrich Dirr]

Hi.

I want to include some literal pdf code into a vpl file so
that when using the virtual font some characters
automatically get colored.

With "normal" TeX I've used successfully the construct
(CHARACTER O 53
   (CHARWD R 1.0)
   (CHARHT R 0.75)
   (CHARDP R 0.25)
   (MAP
      (SPECIAL color push gray 0.6)
      (SELECTFONT D 0)
      (SETCHAR C +)
      (SPECIAL color pop)
      )
   )

Which special code is good for use in pdftex?
I've tried without success:
(CHARACTER O 53
   (CHARWD R 1.0)
   (CHARHT R 0.75)
   (CHARDP R 0.25)
   (MAP
      (SPECIAL 0 0 0 0.3 k 0 0 0 0.3 K)
      (SELECTFONT D 0)
      (SETCHAR C +)
      (SPECIAL 0 0 0 0.3 k 0 0 0 0.3 K)
      )
   )

But maybe I didn't understand the virtual font mechanism
correctly.

Any idea?

Ulrich