=> R0 = flags (must be 0)
R1 = pointer to drawfile block
R2 = length of block
R3 = transformation matrix, or 0 to use identity
R4 = pointer to 4 word buffer for bounding box in Draw units
<= All preserved
This SWI is used to determine the bounding box (in draw units) of the given Draw file, as if it were plotted with the transformation given.
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