Launcher: support Component icons inside apworlds (#3629)

* Add kivy overrides to allow AsyncImage source paths of the format ap:worlds.module/subpath/to/data.png that use pkgutil to load files from within an apworld

* Apply suggestions from code review

Co-authored-by: Doug Hoskisson <beauxq@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Doug Hoskisson <beauxq@users.noreply.github.com>

* change original-load variable name for clarity per review

* add comment to record pkgutil format

* remove dependency on PIL

* i hate typing

---------

Co-authored-by: Doug Hoskisson <beauxq@users.noreply.github.com>

kvui.py

@@ -3,6 +3,8 @@ import logging
 import sys
 import typing
 import re
+import io
+import pkgutil
 from collections import deque
 
 assert "kivy" not in sys.modules, "kvui should be imported before kivy for frozen compatibility"
@@ -34,6 +36,7 @@ from kivy.app import App
 from kivy.core.window import Window
 from kivy.core.clipboard import Clipboard
 from kivy.core.text.markup import MarkupLabel
+from kivy.core.image import ImageLoader, ImageLoaderBase, ImageData
 from kivy.base import ExceptionHandler, ExceptionManager
 from kivy.clock import Clock
 from kivy.factory import Factory
@@ -61,6 +64,7 @@ from kivy.uix.recycleboxlayout import RecycleBoxLayout
 from kivy.uix.recycleview.layout import LayoutSelectionBehavior
 from kivy.animation import Animation
 from kivy.uix.popup import Popup
+from kivy.uix.image import AsyncImage
 
 fade_in_animation = Animation(opacity=0, duration=0) + Animation(opacity=1, duration=0.25)
 
@@ -838,6 +842,40 @@ class HintLog(RecycleView):
             element.height = max_height
 
 
+class ApAsyncImage(AsyncImage):
+    def is_uri(self, filename: str) -> bool:
+        if filename.startswith("ap:"):
+            return True
+        else:
+            return super().is_uri(filename)
+
+
+class ImageLoaderPkgutil(ImageLoaderBase):
+    def load(self, filename: str) -> typing.List[ImageData]:
+        # take off the "ap:" prefix
+        module, path = filename[3:].split("/", 1)
+        data = pkgutil.get_data(module, path)
+        return self._bytes_to_data(data)
+
+    def _bytes_to_data(self, data: typing.Union[bytes, bytearray]) -> typing.List[ImageData]:
+        loader = next(loader for loader in ImageLoader.loaders if loader.can_load_memory())
+        return loader.load(loader, io.BytesIO(data))
+
+
+# grab the default loader method so we can override it but use it as a fallback
+_original_image_loader_load = ImageLoader.load
+
+
+def load_override(filename: str, default_load=_original_image_loader_load, **kwargs):
+    if filename.startswith("ap:"):
+        return ImageLoaderPkgutil(filename)
+    else:
+        return default_load(filename, **kwargs)
+
+
+ImageLoader.load = load_override
+
+
 class E(ExceptionHandler):
     logger = logging.getLogger("Client")