ulDirection (ULONG)

Direction in which the returned rectangles are to be ordered.

This ordering uses the leading edge of a rectangle:

RECTDIR_LFRT_TOPBOT

Left-to-right, top-to-bottom
RECTDIR_RTLF_TOPBOT
Right-to-left, top-to-bottom
RECTDIR_LFRT_BOTTOP
Left-to-right, bottom-to-top
RECTDIR_RTLF_BOTTOP
Right-to-left, bottom-to-top

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