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|
{ pkgs, ... }:
pkgs.writeDashBin "generate-wallpaper" ''
set -euf
# usage: getimg FILENAME URL
fetch() {
echo "fetch $1"
curl -LsS -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 $result
}
main() {
cd "$working_dir"
# fetch source images in parallel
fetch nightmap-raw.jpg \
"$nightmap_url" &
fetch daymap-raw.png \
"$daymap_url" &
fetch clouds-raw.jpg \
"$cloudmap_url" &
fetch marker.json \
"$marker_url" &
wait
check_type nightmap-raw.jpg image
check_type daymap-raw.png image
check_type clouds-raw.jpg image
in_size=2048x1024
xplanet_out_size=1466x1200
out_geometry=1366x768+100+160
nightsnow_color='#0c1a49' # nightmap
for raw in \
nightmap-raw.jpg \
daymap-raw.png \
clouds-raw.jpg \
;
do
normal=''${raw%-raw.*}.png
if needs_rebuild $normal $raw; then
echo "make $normal; normalize $raw" >&2
convert $raw -scale $in_size $normal
fi
done
# create nightmap-fullsnow
if needs_rebuild nightmap-fullsnow.png; then
convert -size $in_size xc:$nightsnow_color nightmap-fullsnow.png
fi
# extract daymap-snowmask from daymap-final
if needs_rebuild daymap-snowmask.png daymap.png; then
convert daymap.png -threshold 95% daymap-snowmask.png
fi
# extract nightmap-lightmask from nightmap
if needs_rebuild nightmap-lightmask.png nightmap.png; then
convert nightmap.png -threshold 25% nightmap-lightmask.png
fi
# create layers
make_layer nightmap-snowlayer.png nightmap-fullsnow.png daymap-snowmask.png
make_layer nightmap-lightlayer.png nightmap.png nightmap-lightmask.png
# apply layers
flatten nightmap-lightsnowlayer.png \
nightmap-lightlayer.png \
nightmap-snowlayer.png
flatten nightmap-final.png \
nightmap-lightsnowlayer.png \
nightmap.png
# create marker file from json
if [ -s marker.json ]; then
jq -r 'to_entries[] | @json "\(.value.latitude) \(.value.longitude)"' marker.json > marker_file
fi
# make all unmodified files as final
for normal in \
daymap.png \
clouds.png \
;
do
final=''${normal%.png}-final.png
needs_rebuild $final &&
ln $normal $final
done
# rebuild every time to update shadow
xplanet --num_times 1 --geometry $xplanet_out_size \
--output xplanet-output.png --projection merc \
-config ${pkgs.writeText "xplanet.config" ''
[earth]
"Earth"
map=daymap-final.png
night_map=nightmap-final.png
cloud_map=clouds-final.png
cloud_threshold=10
shade=15
''}
xplanet --num_times 1 --geometry $xplanet_out_size \
--output xplanet-krebs-output.png --projection merc \
-config ${pkgs.writeText "xplanet-krebs.config" ''
[earth]
"Earth"
map=daymap-final.png
night_map=nightmap-final.png
cloud_map=clouds-final.png
cloud_threshold=10
marker_file=marker_file
shade=15
''}
# trim xplanet output
if needs_rebuild realwallpaper.png xplanet-output.png; then
convert xplanet-output.png -crop $out_geometry \
realwallpaper-tmp.png
mv realwallpaper-tmp.png realwallpaper.png
fi
if needs_rebuild realwallpaper-krebs.png xplanet-krebs-output.png; then
convert xplanet-krebs-output.png -crop $out_geometry \
realwallpaper-krebs-tmp.png
mv realwallpaper-krebs-tmp.png realwallpaper-krebs.png
fi
}
main "$@"
''
|
