moon: real lunar map (CC BY 4.0) with correct near-side geometry - the old normal sign lit the far side, so the disc came out black; stars are now occluded by the disc, sun and moon discs drawn at 12x physical without changing surface brightness; build.py inlines the map as a data URI

build.py

@@ -11,6 +11,7 @@ What gets inlined:
   - vendor/suncalc.js, vendor/plane3d.js,
     vendor/clouds3d.js                        (plain <script> swap)
   - vendor/stars.json                         (window.__starsData)
+  - vendor/moon.jpg                           (window.__moonTex, data URI)
   - every stylesheet referenced by window.THEMES
                                               (window.__inlineThemeCss, so
                                                theme switching works offline)
@@ -24,6 +25,7 @@ Overpass cache, which is the gentlest way to hit those upstreams.
 The build fails loudly if any external script or stylesheet reference survives.
 """
 
+import base64
 import json
 import os
 import re
@@ -128,12 +130,18 @@ def main():
     # embedded data preamble (must run before the scene scripts)
     stars = json.loads(read('vendor/stars.json'))
     theme_css = {name: read(fname) for name, fname in themes.items()}
+    moon_path = os.path.join(ROOT, 'vendor', 'moon.jpg')
+    moon_uri = ''
+    if os.path.exists(moon_path):
+        with open(moon_path, 'rb') as f:
+            moon_uri = 'data:image/jpeg;base64,' + base64.b64encode(f.read()).decode('ascii')
     embed = (
         '<script>\n'
         'window.__starsData = %s;\n'
+        'window.__moonTex = "%s";\n'
         'window.__inlineThemeCss = %s;\n'
         '</script>\n'
-        % (json.dumps(stars, separators=(',', ':')), json.dumps(theme_css))
+        % (json.dumps(stars, separators=(',', ':')), moon_uri, json.dumps(theme_css))
     )
     # must come before config.js so the early theme loader sees the CSS
     anchor = '<script src="config.js"></script>'
@@ -158,8 +166,8 @@ def main():
         with tempfile.NamedTemporaryFile('w', suffix='.html', delete=False) as f:
             f.write(html)
             tmp = f.name
-        print('OK: self-contained (%d bytes, %d themes, %d stars)'
-              % (len(html), len(themes), len(stars)))
+        print('OK: self-contained (%d bytes, %d themes, %d stars, moon map %d KB)'
+              % (len(html), len(themes), len(stars), len(moon_uri) // 1024))
         os.unlink(tmp)
         return
 
@@ -167,8 +175,9 @@ def main():
         f.write(html)
 
     print('Wrote %s (%d bytes)' % (out, len(html)))
-    print('Inlined: %s, stars.json (%d entries), themes: %s'
-          % (', '.join(INLINED_SCRIPTS), len(stars), ', '.join(sorted(themes))))
+    print('Inlined: %s, stars.json (%d entries), moon.jpg (%d KB), themes: %s'
+          % (', '.join(INLINED_SCRIPTS), len(stars), len(moon_uri) // 1024,
+             ', '.join(sorted(themes))))
 
 
 if __name__ == '__main__':