Note! Preview path contains 320 pixel line buffer for rotation. Therefore, upper 640 pixels, input images must
be pre-scaled by over 1/2 for capturing valid preview image.
TargetHsize_Pr and TargetVsize_Pr must not be larger than Camera SourceHsize and Camera SourceVsize.
DMA input source size don't care. Line Buffer size for Rotation is 320 Words per line. (It means that max
TargetHsize is 320 pixels when RGB888/666 & Rot90_Pr=1).