env/utils/avatars/faris-black-mage/generate-squares.sh

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2020-11-28 16:43:17 +01:00
#!/bin/sh
# env
# Written in 2020 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
: ${CANVAS_HEIGHT:=352}
: ${CANVAS_WIDTH:=352}
: ${IMAGE_HEIGHT:=500}
: ${IMAGE_WIDTH:=500}
if ! tmpfile=$(mktemp -t bg.XXXXXXXXXX); then
printf "%s: can't create temporary file\n" "${0##*/}" >&2
exit 1
fi
trap 'rm -f "$tmpfile"' EXIT INT QUIT TERM
basefile=ff5-faris-black-mage.png
basename=${basefile%.png}
pngtopam -alphapam "$basefile" |
pamcut -top 0 -left -0 -width "$CANVAS_WIDTH" -height "$CANVAS_HEIGHT" |
pamtopng >"$basename-square.png"
pngtopam -alphapam "$basename-square.png" >"$tmpfile"
for color in black white; do
ppmmake "$color" "$CANVAS_WIDTH" "$CANVAS_HEIGHT" |
pamcomp "$tmpfile" |
pamtopng >"$basename-square-bg-$color.png"
done