#!/bin/sh

exitwithhelp()
{
	echo "Usage: navit_svg2png <conversion_tool> <output_png_filename> [<width_px> <height_px>]"
	echo "The input filename is the same than the output png one with svg or svgz extension"
	echo "Possible conversion tools: ksvgtopng, ksvgtopng4, rsvg-convert, inkscape and convert"
	echo "width_px and height_px arguments can be omitted if output png size is specified in the filename, like this: imagename_WIDTH_HEIGHT.png (ex. myPng_100_100.png)"
	exit
}

svgtopng()
{
	case $svgtopng in
	*ksvgtopng|*ksvgtopng4)
		$svgtopng $*
		;;
	*rsvg-convert)
		$svgtopng --width=$1 --height=$2 --output $4 $3
		;;
	*inkscape)
		$svgtopng --export-width=$1 --export-height=$2 --export-type=png --export-filename=$4 $3
		;;
	*convert)
		$svgtopng -alpha on -background none $3 -resize $1x$2 $4
		;;
	*)
		echo "Error: unknown conversion tool"
		exitwithhelp    # unknown conversion tool
		;;
	esac
}

if [ "$OSTYPE" != "cygwin" -a "$OSTYPE" != "msys" ]; then
	ulimit -t 10
fi

svgtopng=$1
png=$2
w=$3
h=$4

# if -h or --help arg is passed, print help and exit
case "$1" in
	'-h'|'--help'|'')
		exitwithhelp
		;;
esac

# args num must be == 2 or == 4
if [ "$#" -ne 2 ] && [ "$#" -ne 4 ];
then
	echo "Error: wrong number of arguments"
	exitwithhelp
fi

case "$png" in
	*_[1-9]*_[1-9]*.png)
		if [ "$#" -ne 2 ]; then
			echo "Error: output png size is specified by filename and by arguments, plese use only one"
			exitwithhelp    # png size musn't be specifed, only in filename
		fi
		svg=${png%_*_*.png};
		h=${png##*_}
		w=${png%_$h}
		h=${h%.png}
		w=${w##*_}
		;;
	*)
		if [ "$#" -ne 4 ]; then
			echo "Error: please, specify output png size"
			exitwithhelp    # filename doesn't specify png size, must be done with args 3 and 4
		fi
		svg=${png%.png}
		;;
esac
if [ ! -f $svg.svg -a ! -f $svg.svgz ]
then
	svg="$SRCDIR/$svg"
fi
if [ -f $png -a ! -f $svg.svg ]; then
	# width and height seems to be defined as part of the file name
	touch $png
else
	# use width and height from the svg image
	if [ -f $svg.svg ]
	then
		if [ -z "$w" ]
		then
			w=$(grep 'width="[0-9pxt.]*"' $svg.svg | head -n 1 | sed -e 's/.*width="//' -e 's/[pxt]*".*//')
		fi
		if [ -z "$h" ]
		then
			h=$(grep 'height="[0-9pxt.]*"' $svg.svg | head -n 1 | sed -e 's/.*height="//' -e 's/[pxt]*".*//')
		fi
		svgtopng $w $h $svg.svg $png
	elif [ -f $svg.svgz ]
	then
		gzip -dc <$svg.svgz >$svg.svg
		if [ -z "$w" ]
		then
			w=$(grep 'width="[0-9pxt.]*"' $svg.svg | head -n 1 | sed -e 's/.*width="//' -e 's/[pxt]*".*//')
		fi
		if [ -z "$h" ]
		then
			h=$(grep 'height="[0-9pxt.]*"' $svg.svg | head -n 1 | sed -e 's/.*height="//' -e 's/[pxt]*".*//')
		fi
		svgtopng $w $h $svg.svg $png
		rm -f $svg.svg
	fi
fi
exit 0