35 lines
1.1 KiB
Bash
35 lines
1.1 KiB
Bash
#!/bin/sh
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# env
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# Written in 2019 by Lucas
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# CC0 1.0 Universal/Public domain - No rights reserved
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#
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# To the extent possible under law, the author(s) have dedicated all
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# copyright and related and neighboring rights to this software to the
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# public domain worldwide. This software is distributed without any
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# warranty. You should have received a copy of the CC0 Public Domain
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# Dedication along with this software. If not, see
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# <http://creativecommons.org/publicdomain/zero/1.0/>.
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: ${CANVAS_BGCOLOR:="#0d0a00"}
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: ${CANVAS_HEIGHT:=768}
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: ${CANVAS_WIDTH:=1366}
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: ${IMAGE_HEIGHT:=500}
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: ${IMAGE_WIDTH:=500}
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pos_x=$((3 * $CANVAS_WIDTH / 4 - $IMAGE_WIDTH / 2))
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pos_y=$(($CANVAS_HEIGHT / 2 - $IMAGE_HEIGHT / 2))
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if ! tmpfile=$(mktemp -t bg.XXXXXXXXXX); then
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printf "%s: Can't create temporary file.\n" "${0##*/}" >&2
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exit 1
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fi
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trap 'rm -f "$tmpfile"' EXIT INT QUIT TERM
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pngtopam -alphapam FreeHugsBSD.png \
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| pamscale -width="$IMAGE_WIDTH" -height="$IMAGE_HEIGHT" \
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>"$tmpfile"
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ppmmake "$CANVAS_BGCOLOR" "$CANVAS_WIDTH" "$CANVAS_HEIGHT" \
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| pamcomp -xoff="$pos_x" -yoff="$pos_y" "$tmpfile" \
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| pamtopng >FreeHugsBSD-bg.png
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