quantize_fs_dither(unsigned width,short * errorptr,int dir)1 quantize_fs_dither (unsigned width, short *errorptr, int dir)
2 {
3   short bpreverr;
4   unsigned col;
5   for (col = width; col > 0; col--)
6     errorptr += dir;
7   errorptr[0] = (short) bpreverr;
8 }
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