Prelim: Create bldtheme utility

tools/bldtheme/bldtheme.py

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+import argparse
+import fnmatch
+import os
+import sys
+
+from PIL import Image, ImageDraw
+
+
+def main():
+    parser = argparse.ArgumentParser(prog="Theme Part Composer Utility", description="Composes theme part graphics from source files.", epilog="See README.MD if you want to know the details.")
+
+    parser.add_argument("inputdir", help="the input directory to scan for files")
+    parser.add_argument("outputdir", help="the output directory to place composed files")
+
+    args = parser.parse_args()
+
+    for filename in os.listdir(args.inputdir):
+        if fnmatch.fnmatch(filename, "*.src.png"):
+            basename = filename[0:filename.find(".src.png")]
+            maskname = f"{basename}.mask.png"
+            pngname = filename
+
+            pngRGB = Image.open(os.path.join(args.inputdir, pngname))
+
+            maskRGB = Image.open(os.path.join(args.inputdir, maskname))
+            maskMono = maskRGB.convert("1")
+
+            newImage = Image.new("RGBA", pngRGB.size)
+
+            drawing = ImageDraw.Draw(newImage)
+
+            drawing.bitmap((0, 0), maskMono, "rgb(128,128,128)")
+            
+            composed = Image.alpha_composite(newImage, pngRGB)
+
+            composed.save(os.path.join(args.outputdir, f"{basename}.png"))
+
+if __name__ == "__main__":
+    main()

tools/bldtheme/requirements.txt

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+pillow