/* constuct subpath with moveto and repeated lineto from Points */
int construct_path(struct line_pnts *Points, double shift, int t)
{
int i, np, k = 1;
double *xarray, *yarray, x, y;
np = Points->n_points;
xarray = Points->x;
yarray = Points->y;
for (i = 0; i < np; i++) {
x = XCONV(xarray[0] + shift);
y = YCONV(yarray[0]);
fprintf(PS.fp, "%.1f %.1f ", x, y);
if (i == 0 && (t == START_PATH || t == WHOLE_PATH)) {
fprintf(PS.fp, "M ");
}
else {
fprintf(PS.fp, "LN ");
}
if (k == 2) {
fprintf(PS.fp, "\n");
k = 0;
}
else {
fprintf(PS.fp, " ");
k++;
}
xarray++;
yarray++;
}
if (t == CLOSE_PATH || t == WHOLE_PATH) {
fprintf(PS.fp, "CP\n");
}
return 1;
}
/*
* S E P A R A T E
*
* Unpack RGB byte tripples into three separate arrays of integers.
* The first and last pixels are replicated twice, to handle border effects.
*
* Updated version: the outputs are Y U V values, not R G B.
*/
void
separate(register int *rop, register int *gop, register int *bop, register unsigned char *cp, long int num)
/* Y */
/* U */
/* V */
{
register long int i;
register int r, g, b;
r = cp[0];
g = cp[1];
b = cp[2];
#define YCONV(_r, _g, _b) (_r * 0.299 + _g * 0.587 + _b * 0.144 + 0.9)
#define UCONV(_r, _g, _b) (_r * -0.1686 + _g * -0.3311 + _b * 0.4997 + 0.9)
#define VCONV(_r, _g, _b) (_r * 0.4998 + _g * -0.4185 + _b * -0.0813 + 0.9)
rop[-1] = rop[-2] = YCONV(r, g, b);
gop[-1] = gop[-2] = UCONV(r, g, b);
bop[-1] = bop[-2] = VCONV(r, g, b);
for ( i = num-1; i >= 0; i-- ) {
r = cp[0];
g = cp[1];
b = cp[2];
cp += 3;
*rop++ = YCONV(r, g, b);
*gop++ = UCONV(r, g, b);
*bop++ = VCONV(r, g, b);
}
r = cp[-3];
g = cp[-2];
b = cp[-1];
*rop++ = YCONV(r, g, b);
*gop++ = UCONV(r, g, b);
*bop++ = VCONV(r, g, b);
*rop++ = YCONV(r, g, b);
*gop++ = UCONV(r, g, b);
*bop++ = VCONV(r, g, b);
}
