Some control characters have special meanings :
9 dx low,middle,high : Move print position horizontally
11 dy low,middle,high : Move print position vertically
17 colour : Set font colour (+&80 for background)
18 background, foreground, offset : See Font_SetFontColours
19 background, foreground, offset : See ColourTrans_SetFontColours
21 comment string, control terminated
25 underline pos, thickness : Turn underline on/off
26 font handle : See Font_SetFont
27 ALIGN; a, b, c, d : Transform matrix with 0 translation
28 ALIGN; a, b, c, d, e, f : Full transform matrix
9,11 The 3 byte print-position is given in millipoints
25 pos & thickness is given in 1/256th of current font size - pos is sign extended, thickness is unsigned. Set thickness to 0 to turn off underlining.
27,28 The code must be followed by 0-3 null bytes to word align the transformation matrix.
When using 16/32-bit characters, these take a slightly different form.
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