Switch all images to be loaded via base64

.gitignore

@@ -0,0 +1,2 @@
+.vscode
+venv

create-themes.py

@@ -4,6 +4,7 @@
 
 from pathlib import Path
 
+import base64
 import jinja2
 import yaml
 from PIL import Image
@@ -24,6 +25,12 @@ def average_color(fname):
     return "rgba({}, {}, {}, 0.4)".format(*rgb_color)
 
 
+def base64_encode_file(fname):
+    with open(fname, 'rb') as image_file:
+        extension = fname.suffix.split('.')[-1]
+        base64_utf8_str = base64.b64encode(image_file.read()).decode('utf-8')
+        return f'data:image/{extension};base64,{base64_utf8_str}'
+
 BACKGROUND_COLORS = {
     # Suggested by @okets in issue #42
     "blue-red": "rgba(30, 2, 61, 0.4)",
@@ -68,7 +75,8 @@ def average_color(fname):
                     folder=folder,
                     which=which,
                     app_header_background_color=app_header_background_color,
-                    background_jpg=str(background.name),
+                    background_jpg=base64_encode_file(background),
+                    # background_jpg=str(background.name),
                     color=color,
                     suffix=suffix,
                 )

requirements.txt

@@ -1,2 +1,5 @@
-pre-commit
-yamllint
+Jinja2==3.1.4
+pillow==10.3.0
+pre-commit==3.7.1
+PyYAML==6.0.1
+yamllint==1.35.1

template.jinja2

@@ -3,7 +3,7 @@
 #
 ios-{{ which }}-mode-{{ color }}{{ suffix }}:
   # Global
-  background-image: "center / cover no-repeat fixed url('/{{ folder }}/themes/ios-themes/{{ background_jpg }}')"
+  background-image: "center / cover no-repeat fixed url('{{ background_jpg }}')"
   lovelace-background: var(--background-image)
   primary-color: {{ primary_color }}  # from Apple systemOrange {{ which }} mode
   light-primary-color: {{ light_primary_color }}  # (icons on left menu) (light: systemGray5 from iOS dark mode, dark: XXX)