Upsample block (H2V2)
| FwStatus | fwiSampleUpH2V2_JPEG_8u_C1R | ( | const Fw8u * pSrc, int srcStep, FwiSize srcSize, Fw8u * pDst, int dstStep, FwiSize dstSize ); |
| dstSize | Destination image size. | |
| dstStep | Destination buffer step size (width of the buffer in bytes). | |
| pDst | Pointer to a location in a destination buffer. | |
| pSrc | Pointer to a location in a source buffer. | |
| srcSize | Source image size. | |
| srcStep | Source buffer step size (width of the buffer in bytes). |
This function steps through a block 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).