Bits Meaning
0-1 Horizontal location of sprite in box:
00 Left
01 Centre
10 Right
11 undefined
2-3 Vertical location of sprite in box:
00 Bottom
01 Centre
10 Top
11 undefined
4-5 Drag bounding box is:
00 Whole screen
01 Display area of window that the pointer is over
10 User specified
11 undefined
6 Bounding box applies to:
0 The box
1 The pointer
7 Use drop shadow
8 Don't dither sprite (RISC OS 3.50)
9 Centre sprite around pointer (RISC OS 4.00)
10-31 Reserved for future use, should be set to 0.
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