Upsample row H2V2
| FwStatus | fwiSampleUpRowH2V2_Triangle_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 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).