=> R1 = icon block
R4 = x offset, if outside redraw/update loop
R5 = y offset, if outside redraw/update loop
<= R0 corrupt
This SWI can be used to plot a 'virtual' icon during a window redraw/update loop. RISC OS 3 allows its use outside a window redraw/update loop with absolute screen coordinates.
Note: If used outside the redraw/update loop, the graphic area will be reset to the current screen mode. This is not good if outputing to a sprite.
See PRM 3, page 186.
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