Upsample row H2V2


FwStatus   fwiSampleUpRowH2V2_Triangle_JPEG_8u_C1 ( const Fw8u * pSrc1const Fw8u * pSrc2int srcWidthFw8u * 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 upsampling without smoothing, and writes the output data to a destination buffer.

A "triangular" linear interpolation algorithm is used for upsampling; the interpolated pixels are 1/4 and 3/4 of the distance between the source pixels. Ordered dither rounding is used (0.5 is rounded up or down at alternate pixel locations).