#!/bin/sh
#
# script to convert scans header file to an sgi .rgb file by creating a
# C program which includes the header pcbm file, which is compiled, and
# then spits out the .rgb file.

create_cfile () {
cat << EOF
/* temp file for fromspans $1 */

#include <gl/image.h>
#include "$1.h"

short data[512][1280];

int
main(int argc, char ** argv)
{
	char *p = clogo_data;
	int px, y, i, ccol;
	int w = clogo_w; 
	int h = clogo_h;
	IMAGE *img;


	for (y=0; y < clogo_h; y++) {
		for (px=ccol=0; px < clogo_w; px += *p++) {
			if (*p) {
				for (i=px; i <= (px + *p - 1); i++)
					data[y][i] = ccol ? 0 : 255;
			}
			ccol = !ccol;
		}
	}

	img = iopen("spans.bw","w",RLE(1),3,clogo_w,clogo_h,1);

	for (y=0; y < clogo_h; y++)
		putrow(img,data[y],y,0);

	iclose(img);
}
EOF
}

if [ -z "$1" ]
then
	echo "usage: fromspans headername"
	exit 1
fi

SPANFILE=$1
BASENAME=`echo $1 | sed 's%\.h$%%'`
RGBFILE=${BASENAME}.rgb
CONVBIN=tmp_fromspans$$
CONVCFILE=${CONVBIN}.c

create_cfile $BASENAME > $CONVCFILE

cc -g -I ${ROOT}/stand/arcs/include $CONVCFILE -limage -o $CONVBIN

if [ -x $CONVBIN ]
then
	$CONVBIN $RGBFILE
fi

rm -f $CONVCFILE $CONVBIN

exit 0