333068bb_Structure_BITMAPINFOHEADER__2
[0] biHeight [1] DWORD [2] 
Specifies the height of the bitmap in pixels. If biHeight is positive, the bitmap is a "bottom-up" DIB and its origin is the lower left corner. If biHeight is negative, the bitmap is a "top-down" DIB and its origin is the upper left corner. Note that many DaVinci functions only support bottom-up bitmaps (biHeight >= 0).
Structure BITMAPINFOHEADER
2