=> R0 = flags if R1 >0, else 0
R1 = pointer to word aligned buffer or
8 to count buffer space needed
0 to switch to normal output
-1 to read state
<= R0 = previous flags
R1 = previous buffer pointer + size needed by Draw file structure.
This SWI allows calls to Font_Paint to be redirected to build Draw file objects in the supplied buffer. R1 returned points at the 0 terminator (it and the new size remaining are not counted in the data generated). Each letter is converted to a filled path object, as are rubout box(es) and underlining. Before calling the buffer should be :
Offset Contents
0 0
4 size remaining (bytes)
See PRM 3, page 475.
Meaning of bits in R0 when set
0 Update R1 but don't actually store anything
1 Apply hints
4 Generate error if bitmapped characters found
2,3,5-31 0 (reserved)
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