void(* compute_safe_ssd_integral_image)(uint32_t *dst, ptrdiff_t dst_linesize_32, const uint8_t *s1, ptrdiff_t linesize1, const uint8_t *s2, ptrdiff_t linesize2, int w, int h)
void(* compute_weights_line)(const uint32_t *const iia, const uint32_t *const iib, const uint32_t *const iid, const uint32_t *const iie, const uint8_t *const src, float *total_weight, float *sum, const float *const weight_lut, int max_meaningful_diff, int startx, int endx)