#!/bin/sh
# View an image with ImageMagick.

view() {
	# Extract header
	hdr=`head -c 30`

	# Separate fields
	sig=`echo "$hdr" | cut -b 1-9`
	w=`echo "$hdr" | cut -b 11-19`
	h=`echo "$hdr" | cut -b 21-29`

	# Check signature
	if [ "x$sig" = "ximageRGBA" ]; then
		display -size "$w"x"$h" -depth 8 rgba:-
	else
		echo "bad image signature" >/dev/stderr
		exit 1
	fi
}

if [ "x$1" = "x" ]; then
	view
else
	view < "$1"
fi