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I think because the standard bitmap has the following properties.

•   Bitmaps are saved row-based.

•   When the height is positive, it is a bottom-up bitmap, that is, the last line comes first in memory.

•   A row must be aligned on a 4-byte boundary.

•   Color channel order is BGR (unless specified otherwise by BI_BITFIELDS masks).

I think because the standard bitmap has the following properties.

•   
 
Bitmaps are saved row-based.
row-based.
 • 
When the height is positive, it is a a
bottom-up bitmap, that is, the last last
line comes first in memory.
memory. • 
A row must be aligned on a 4-byte boundary.
4-byte
boundary. • 
Color channel order is BGR (unless (unless
specified otherwise by BI_BITFIELDS masks).