=> R0 = flags
R1 = renderer called to render the object
(SWI number or pointer to C/assembler function)
R2 = pointer to block holding registers for SWI / function parameters
R3 = pointer to 16-byte block containing drag box
R4 = pointer to optional block containing bounding box
This SWI starts dragging an object. It uses the given function to render the object into a masked image.
You may dispose of any workspace used by the rendering function as soon as this call returns.
See PRM 5a-512.
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