Downsample row (H2V2)
|FwStatus||fwiSampleDownRowH2V2_Box_JPEG_8u_C1||(||const Fw8u * pSrc1, const Fw8u * pSrc2, int srcWidth, Fw8u * pDst );|
|pDst||Pointer to a location in a destination buffer.|
|pSrc1||Pointer to a location in source buffer one.|
|pSrc2||Pointer to a location in source buffer two.|
|srcWidth||Width of the source row in pixels.|
This function steps through a row of pixel data in a source buffer, performs 2:1 horizontal and 2:1 vertical (4:1:1) chrominance downsampling without smoothing, and writes the output data to a destination buffer.
Row ends are defined by the two source pointers. Ordered dither rounding is used (0.5 is rounded up or down at alternate pixel locations).