COPY_MAXIMA       234 libavfilter/vf_edgedetect.c             case DIRECTION_45UP:        COPY_MAXIMA( 1, -1, -1,  1); break;
COPY_MAXIMA       235 libavfilter/vf_edgedetect.c             case DIRECTION_45DOWN:      COPY_MAXIMA(-1, -1,  1,  1); break;
COPY_MAXIMA       236 libavfilter/vf_edgedetect.c             case DIRECTION_HORIZONTAL:  COPY_MAXIMA( 0, -1,  0,  1); break;
COPY_MAXIMA       237 libavfilter/vf_edgedetect.c             case DIRECTION_VERTICAL:    COPY_MAXIMA(-1,  0,  1,  0); break;