/*
 *      readimage - Read an image file and print its pixel values.
 *
 *      To compile:  cc readimage.c -o readimage -limage
 *
 *                              Paul Haeberli - 1991
 */
#include <gl/image.h>

main(argc,argv)
int argc;
char **argv;
{
    IMAGE *image;
    int x, y, z;
    short *rbuf, *gbuf, *bbuf;

/* print usage message */
    if( argc<2 ) {
	fprintf(stderr,"usage: readimage infile\n");
	exit(1);
    }

/* open the image file */
    if( (image=iopen(argv[1],"r")) == NULL ) {
	fprintf(stderr,"readimage: can't open input file %s",argv[1]);
	exit(1);
    }

/* print a little info about the image */
    printf("Image x and y size in pixels: %d %d",
	image->xsize,image->ysize);
    printf("Image zsize in channels: %d",image->zsize);
    printf("Image pixel min and max: %d %d",image->min,image->max);

/* allocate buffers for image data */
    rbuf = (short *)malloc(image->xsize*sizeof(short));
    gbuf = (short *)malloc(image->xsize*sizeof(short));
    bbuf = (short *)malloc(image->xsize*sizeof(short));

/* check to see if the image is B/W or RGB */
    if(image->zsize == 1) {
	printf("This is a black and write image");
	for(y=0; y<image->ysize; y++) {
	    getrow(image,rbuf,y,0);
	    printf("row %d: ",y);
	    for(x=0; x<image->xsize; x++)
		printf("%d |",rbuf[x]);
	    printf("");
	}
    } else if(image->zsize >= 3) {  /* if the image has alpha zsize is 4 */
	printf("This is a rgb image");
	for(y=0; y<image->ysize; y++) {
	    getrow(image,rbuf,y,0);
	    getrow(image,gbuf,y,1);
	    getrow(image,bbuf,y,2);
	    printf("row %d: ",y);
	    for(x=0; x<image->xsize; x++)
		printf("%d %d %d |",rbuf[x],gbuf[x],bbuf[x]);
	    printf("");
	}
    }
}