may be undefined operation warning

[Wesley Smith]

#define MAX_CHAR(data, accum)	((255 - (data)) > (accum)) ? ((accum) +
(data)) : 255

//output matrix must be the same width as the input matrix and have a
height of 255
void max_jit_scope_waveform_do(t_max_jit_scope *x, t_jit_matrix_info
*in_minfo, char *bip,
												t_jit_matrix_info *out_minfo, char *bop)
{
	uchar *cp;
	int i, j;
	int width, height, planecount, oplanecount;
	int voffset;
	int in_rowstride, out_rowstride;
	uchar accum = x->accum;
	
	planecount = in_minfo->planecount;
	oplanecount = out_minfo->planecount;
	width = in_minfo->dim[0];
	height = in_minfo->dim[1];
	voffset = out_minfo->dim[1] - 1;

	in_rowstride = in_minfo->dimstride[1];
	out_rowstride = out_minfo->dimstride[1];
	
	switch(planecount)
	{
		case 1:
		{
			//luma pass
			for(j=0; j < height; j++)
			{
				cp = (uchar *)(bip + j*in_rowstride);
				for(i=0; i < width; i++)
				{
					uchar *out_pix = (uchar *)(bop + i*oplanecount + (voffset -
(*cp++))*out_rowstride);
					*out_pix++ = 255;
					*out_pix++ = MAX_CHAR(*out_pix, accum);
					*out_pix++ = MAX_CHAR(*out_pix, accum);
					*out_pix++ = MAX_CHAR(*out_pix, accum);
				}
			}
		} break;
		
//// more cut off