/*# proc: image_pad - pads an image to a new byte-aligned width and height based# proc:             on new width and height dimensions.*//* LINTLIBRARY */#include <stdio.h>#include <memory.h>#include <sys/types.h>#include <sys/param.h>/* * Stan Janet * 2/14/91 * * image_pad() * * image_pad() pads an 8-bit image's width and height to *	"padw" and "padh" bits. On return, "image" may point *	to a larger buffer. * New pixels outside original image are set to "bg". * Returns 1 if a new image was obtained via malloc(3), *	or 0 if no padding was necessary. Caller should *	free(3) the original image if appropriate. * */#define SUBR_STR	"image_pad"int image_pad(image,w,h,padw,padh,bg)u_char **image;u_int w, h, padw, padh;int bg;{u_char *p, *new_image;u_int new_size;int diff_w, diff_h;extern char *malloc();if (image == (u_char **) NULL)	fatalerr(SUBR_STR,"null image pointer address",(char *)NULL);if (*image == (u_char *) NULL)	fatalerr(SUBR_STR,"null image pointer",(char *)NULL);if (padw == 0)	fatalerr(SUBR_STR,"pad width is zero",(char *)NULL);if (padh == 0)	fatalerr(SUBR_STR,"pad height is zero",(char *)NULL);if ((w == 0) || (h == 0))		/* no image to pad */	return 0;if ((w == padw) && (h == padh))		/* no growth */	return 0;new_size = padw * padh;new_image = (u_char *) malloc(new_size);if (new_image == (u_char *) NULL)	fatalerr(SUBR_STR,"malloc failed",(char *)NULL);p = new_image;diff_w = (int) (padw - w);diff_h = (int) (padh - h);while (h--) {        memcpy((char *)p, (char *)*image, (int)w);	*image += w;	p += w;	if (diff_w) {		(void) memset((char *)p, bg, diff_w);		p += diff_w;	}}if (diff_h)	(void) memset((char *)p, bg, (int)padw * diff_h);*image = new_image;return 1;}