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#!/bin/sh
set -euf
###### USAGE #####
#run in new directory(will be polluted with images
#just run ./make-realwallpaper
main() {
# fetch source images in parallel
fetch nightmap.jpg \
http://awka.sourceforge.net/Night_le_huge.jpg &
fetch daymap.png \
http://www.nnvl.noaa.gov/images/globaldata/SnowIceCover_Daily.png &
fetch cloud-layer.jpg \
http://user.chol.com/~winxplanet/cloud_data/clouds_2048.jpg &
wait
check_type nightmap.jpg image
check_type daymap.png image
check_type cloud-layer.jpg image
# downscale daymap to match nightmap
needs_rebuild daymap-final.png \
daymap.png \
&& convert daymap.png -scale $(image_size nightmap.jpg) daymap-final.png
# create nightmap-fullsnow
needs_rebuild nightmap-fullsnow.png \
&& convert \
-size $(image_size nightmap.jpg) \
'xc:#0a3b5c' nightmap-fullsnow.png
# extract daymap-snowmask from daymap-fonal
needs_rebuild daymap-snowmask.png \
daymap-final.png \
&& convert daymap-final.png -threshold 95% daymap-snowmask.png
# extract nightmap-lightmask from nightmap
needs_rebuild nightmap-lightmask.png \
nightmap.jpg \
&& convert nightmap.jpg -threshold 25% nightmap-lightmask.png
# create layers
make_layer nightmap-snowlayer.png nightmap-fullsnow.png daymap-snowmask.png
make_layer nightmap-lightlayer.png nightmap.jpg nightmap-lightmask.png
# apply layers
flatten nightmap-lightsnowlayer.png \
nightmap-lightlayer.png \
nightmap-snowlayer.png
flatten nightmap-final.png \
nightmap-lightsnowlayer.png \
nightmap.jpg
# create xplanet output
needs_rebuild xplanet.config \
&& cat >xplanet.config <<EOF
[earth]
"Earth"
map=daymap-final.png
night_map=nightmap-final.png
cloud_map=cloud-layer.jpg
EOF
needs_rebuild xplanet-output.png \
daymap-final.png \
nightmap-final.png \
cloud-layer.jpg \
&& xplanet --num_times 1 --geometry 1466x1200 \
--output xplanet-output.png --projection merc -config xplanet.config
# trim xplanet output
needs_rebuild realwallpaper.png \
xplanet-output.png \
&& convert xplanet-output.png -crop 1366x768+100+160 realwallpaper.png
}
# usage: getimg FILENAME URL
fetch() {
echo "fetch $1"
curl -sS -z "$1" -o "$1" "$2"
}
# usage: check_type FILENAME TYPE
check_type() {
if ! file -ib "$1" | grep -q "^$2/"; then
echo "$1 is not of type $2" >&2
rm "$1"
return 1
fi
}
# usage: image_size FILENAME
image_size() {
identify "$1" | awk '{print$3}'
}
# usage: make_mask DST SRC MASK
make_layer() {
if needs_rebuild "$@"; then
echo "make $1 (apply mask)" >&2
convert "$2" "$3" -alpha off -compose copy_opacity -composite "$1"
fi
}
# usage: flatten DST HILAYER LOLAYER
flatten() {
if needs_rebuild "$@"; then
echo "make $1 (flatten)" >&2
composite "$2" "$3" "$1"
fi
}
# usage: needs_rebuild DST SRC...
needs_rebuild() {
a="$1"
shift
if ! test -e "$a"; then
#echo " $a does not exist" >&2
result=0
else
result=1
for b; do
if test "$b" -nt "$a"; then
#echo " $b is newer than $a" >&2
result=0
fi
done
fi
#case $result in
# 0) echo "$a needs rebuild" >&2;;
#esac
return $result
}
main "$@"
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