=> R1 = Block :
0 Window handle
4 Work area rectangle minx (incl)
8 miny (incl)
12 maxx (excl)
16 maxy (excl)
<= Exits through Wimp_GetRectangle
This SWI is similar to Wimp_RedrawWindow.
Differences :
· Not all of the window has to be updated.
· Rectangles are not cleared by Wimp.
· Can be called at any time, not just in response to RedrawWindow message.
Note: This SWI does not remove rectangles from Wimp_RedrawWindows list of invalid rectangles. If the area is already invalid, then Wimp will send you redraw messages, even if you have updated the area.
See PRM 3, page 131.
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