Initial import of the open source release

1 files changed, 132 insertions, 0 deletions

diff --git a/tools/dump-pal.py b/tools/dump-pal.py
new file mode 100755
index 0000000..84c52e3
--- /dev/null
+++ b/tools/dump-pal.py
@@ -0,0 +1,132 @@
+#!/usr/bin/env python3
+
+__version__ = "1.0"
+
+from argparse import ArgumentParser
+from PIL import Image
+
+# firmware
+CPC_PAL = (
+    [0, 0, 0],
+    [0, 0, 128],
+    [0, 0, 255],
+    [128, 0, 0],
+    [128, 0, 128],
+    [128, 0, 255],
+    [255, 0, 0],
+    [255, 0, 128],
+    [255, 0, 255],
+    [0, 128, 0],
+    [0, 128, 128],
+    [0, 128, 255],
+    [128, 128, 0],
+    [128, 128, 128],
+    [128, 128, 255],
+    [255, 128, 0],
+    [255, 128, 128],
+    [255, 128, 255],
+    [0, 255, 0],
+    [0, 255, 128],
+    [0, 255, 255],
+    [128, 255, 0],
+    [128, 255, 128],
+    [128, 255, 255],
+    [255, 255, 0],
+    [255, 255, 128],
+    [255, 255, 255],
+)
+
+SW_TO_HW = (
+    0x54,
+    0x44,
+    0x55,
+    0x5C,
+    0x58,
+    0x5D,
+    0x4C,
+    0x45,
+    0x4D,
+    0x56,
+    0x46,
+    0x57,
+    0x5E,
+    0x40,
+    0x5F,
+    0x4E,
+    0x47,
+    0x4F,
+    0x52,
+    0x42,
+    0x53,
+    0x5A,
+    0x59,
+    0x5B,
+    0x4A,
+    0x43,
+    0x4B,
+)
+
+
+def main():
+
+    parser = ArgumentParser(
+        description="PNG to CPC palette (firmware)",
+        epilog="Copyright (C) 2015-2023 Juan J Martinez <jjm@usebox.net>",
+    )
+
+    parser.add_argument(
+        "--version", action="version", version="%(prog)s " + __version__
+    )
+    parser.add_argument("--header", dest="header", action="store_true")
+    parser.add_argument("--hardware", dest="hardware", action="store_true")
+    parser.add_argument("image", help="image to convert")
+    parser.add_argument(
+        "pal_dump",
+        help="filename for the palette dump (variable if header flag is set)",
+    )
+
+    args = parser.parse_args()
+
+    try:
+        image = Image.open(args.image)
+    except IOError:
+        parser.error("failed to open the image")
+
+    if image.mode != "P":
+        parser.error("not an indexed image (no palette)")
+
+    palette = image.getpalette()
+    if not palette:
+        parser.error("failed to extract the palette (is this an indexed image?)")
+
+    rgb = []
+    for i in range(0, 16 * 3, 3):
+        c = palette[i : i + 3]
+        if c not in CPC_PAL:
+            parser.error("%r not in the CPC palette" % c)
+        rgb.append(c)
+
+    out = [CPC_PAL.index(c) for c in rgb]
+    if len(out) < 16:
+        out.extend([0 for _ in range(16 - len(out))])
+
+    if args.hardware:
+        out = [SW_TO_HW[c] for c in out[:]]
+
+    if args.header:
+        print("/* %s palette */" % ("hardware" if args.hardware else "firmware"))
+        print("#ifdef LOCAL")
+        print(
+            "const unsigned char %s[] = { %s };\n"
+            % (args.pal_dump, ", ".join([hex(c) for c in out]))
+        )
+        print("#else")
+        print("extern const unsigned char %s[];\n" % (args.pal_dump))
+        print("#endif")
+    else:
+        with open(args.pal_dump, "wb") as fd:
+            fd.write(bytearray(out))
+
+
+if __name__ == "__main__":
+    main()