From 5642a076dea5e87604753adb82705f675db76e09 Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Sat, 11 Jan 2020 20:26:24 +0100
Subject: realwallpaper: move script to pkgs

---
 krebs/5pkgs/simple/realwallpaper/default.nix | 185 +++++++++++++++++++++++++++
 1 file changed, 185 insertions(+)
 create mode 100644 krebs/5pkgs/simple/realwallpaper/default.nix

(limited to 'krebs/5pkgs/simple/realwallpaper')

diff --git a/krebs/5pkgs/simple/realwallpaper/default.nix b/krebs/5pkgs/simple/realwallpaper/default.nix
new file mode 100644
index 00000000..ef83d2e5
--- /dev/null
+++ b/krebs/5pkgs/simple/realwallpaper/default.nix
@@ -0,0 +1,185 @@
+{ 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 $out_geometry \
+        realwallpaper-krebs-tmp.png
+        mv realwallpaper-krebs-tmp.png realwallpaper-krebs.png
+    fi
+  }
+
+  main "$@"
+''
-- 
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