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#!/bin/sh
INPUT="$1"
FRAMES="$2"
die() {
echo "$@"
exit 1
}
check_command() {
cmd="$1"
command -v "$cmd" > /dev/null || die "command '$cmd' not found"
}
check_command magick
check_command identify
[ "$#" -eq 2 ] || die "usage: $0 <input image> <frame count>"
[ -e "$INPUT" ] || die "file not found: $INPUT"
[ "$FRAMES" -gt 0 ] || die "invalid frame count: $FRAMES"
tile_width=$(identify -format "%w" "$INPUT")
tile_height=$(identify -format "%h" "$INPUT")
OUTPUT="$INPUT.scroll.png"
magick -size "${tile_width}x$(( $tile_height * $FRAMES ))" 'xc:#ff00ff00' "$OUTPUT"
for i in $(seq 0 $(( $FRAMES - 1 ))); do
offset_x=$(( $tile_width * $i / $FRAMES ))
offset_y=$(( i * $tile_height ))
magick "$OUTPUT" "$INPUT" -geometry "+${offset_x}+${offset_y}" -composite "$OUTPUT"
magick "$OUTPUT" "$INPUT" -geometry "+$(( $offset_x - $tile_width ))+${offset_y}" -composite "$OUTPUT"
echo "+${offset_x}+${offset_y}"
done
# magick -size ${total_width}x${sprite_height} xc:none canvas.png
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