=> R1 = pointer to 4 word block to receive rectangle to print
<= R0 = 0 if finished
bit 24 set, this rectangle is for pre-scan only [3.60+]
R1 = preserved
R2 = ID word for this rectangle
This SWI is called to get further rectangles to print.
If R0 is 0 on return then R2 and the buffer pointed to by R1 are undefined. Otherwise R0 gives the number of copies still to print - this is intended for display to users only, as it may not decrease smoothly.
Pre-scanning is used by the JPEG printer drivers to ascertain memory requirements, but should always be enabled when available for future compatibility. In general pre-scanning is transparent to applications, so bit 24 can be ignored.
See PRM 3, page 628.
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