=> R0 = window handle
R1 = source minx (incl)
R2 = miny (incl)
R3 = maxx (excl)
R4 = maxy (excl)
R5 = destination minx (incl)
R6 = miny (incl)
This SWI copies as much as possible of source-rectangle, to given dest. The rest is invalidated. This call cannot be made from inside a redraw / update loop.
All coordinates are relative to the window's work area.
Note that ECF fills and tiling patterns can get out of step with this call (for an example watch the taskmanager in a 2 colour mode).
See PRM 3, page 204.
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