=> R1 = pointer to block containing window handle
<= R0 = 0 if no more
Block at R1 is updated
This SWI returns info for the next rectangle to be redrawn. The graphics window is set to clip to the rectangle.
See PRM 3, page 133.
Rectangle to be redrawn
0 Window handle
4 Visible area minx (incl)
8 miny (incl)
12 maxx (excl)
16 maxy (excl)
20 Scrollx
24 Scrolly
28 Redraw rect minx (incl)
32 miny (incl)
36 maxx (excl)
40 maxy (excl)
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