New and improved converter

cc-pic.py

@@ -1,9 +1,10 @@
 #!/usr/bin/env python3
-# x-run: python3 % ~/downloads/kanade/6bf3cdae12b75326e3c23af73105e5781e42e94e.jpg n25.cpi
 
 from typing import BinaryIO, TextIO
 from PIL import Image
-from sys import argv
+from argparse import ArgumentParser, RawTextHelpFormatter
+from textwrap import dedent
+
 
 class Converter:
     CC_COLORS = [
@@ -25,17 +26,15 @@ class Converter:
         ("f", "colors.black"),
     ]
 
-    PIX_BITS = [
+    PIX_BITS = [[1, 2], [4, 8], [16, 0]]
-        [ 1,  2 ],
-        [ 4,  8 ],
-        [ 16, 0 ]
-    ]
 
-    MAX_DIFF = (3 ** 0.5) * 255
+    MAX_DIFF = (3**0.5) * 255
 
     def __init__(self, image: Image.Image):
         self._img = image.convert("P", palette=Image.ADAPTIVE, colors=16)
-        self._palette: list[int] = self._img.getpalette()  # type: ignore
+        self._palette: list[int] = self._img.getpalette() or []
+        if len(self._palette) < 16 * 3:
+            self._palette += [0] * ((16 * 3) - len(self._palette))
 
     def _brightness(self, i: int) -> float:
         r, g, b = self._palette[i * 3 : (i + 1) * 3]
@@ -44,7 +43,9 @@ class Converter:
     def _distance(self, a: int, b: int) -> float:
         r1, g1, b1 = self._palette[a * 3 : (a + 1) * 3]
         r2, g2, b2 = self._palette[b * 3 : (b + 1) * 3]
-        return ((r1 - r2) ** 2 + (g1 - g2) ** 2 + (b1 - b2) ** 2) ** 0.5 / self.MAX_DIFF
+        return (
+            (r1 - r2) ** 2 + (g1 - g2) ** 2 + (b1 - b2) ** 2
+        ) ** 0.5 / self.MAX_DIFF
 
     def _get_colors(self, x: int, y: int) -> tuple[int, int]:
         brightest_i, brightest_l = 0, 0
@@ -67,7 +68,9 @@ class Converter:
         out: int = 0
         for oy, line in enumerate(self.PIX_BITS):
             for ox, bit in enumerate(line):
-                if not self._is_darker(dark_i, bri_i, self._img.getpixel((x + ox, y + oy))):
+                if not self._is_darker(
+                    dark_i, bri_i, self._img.getpixel((x + ox, y + oy))
+                ):
                     out |= bit
         # bottom right pixel fix?
         if self._is_darker(dark_i, bri_i, self._img.getpixel((x + 1, y + 2))):
@@ -82,10 +85,7 @@ class Converter:
         for y in range(0, self._img.height - 2, 3):
             for x in range(0, self._img.width - 1, 2):
                 ch, bg, fg = self._get_block(x, y)
-                io.write(bytes([
+                io.write(bytes([(ch + 0x80) & 0xFF, fg << 4 | bg]))
-                    (ch + 0x80) & 0xFF,
-                    fg << 4 | bg
-                ]))
 
     def export(self, io: TextIO):
         io.write("local m = peripheral.find('monitor')\n")
@@ -95,7 +95,9 @@ class Converter:
         io.write("-- configuring palette\n")
         for i in range(16):
             r, g, b = self._palette[i * 3 : (i + 1) * 3]
-            io.write(f"m.setPaletteColor({self.CC_COLORS[i][1]}, 0x{r:02x}{g:02x}{b:02x})\n")
+            io.write(
+                f"m.setPaletteColor({self.CC_COLORS[i][1]}, 0x{r:02x}{g:02x}{b:02x})\n"
+            )
         io.write("\n")
         io.write("-- writing pixels\n")
 
@@ -109,23 +111,136 @@ class Converter:
                 s.append(ch + 0x80)
                 bgs += self.CC_COLORS[bg][0]
                 fgs += self.CC_COLORS[fg][0]
-            io.write("m.blit(string.char(%s), '%s', '%s')\n" % (
+            io.write(
-                str.join(", ", map(str, s)),
+                "m.blit(string.char(%s), '%s', '%s')\n"
-                fgs,
+                % (str.join(", ", map(str, s)), fgs, bgs)
-                bgs
+            )
-            ))
 
 
-def main(fp_in, fp_out):
+def main():
-    size = 143 * 2, 81 * 3 # 286, 243
+    parser = ArgumentParser(
-    with Image.new("RGB", size) as canv:
+        description="ComputerCraft Palette Image converter",
-        with Image.open(fp_in) as img:
+        formatter_class=RawTextHelpFormatter,
-            scale = max(img.width / size[0], img.height / size[0])
+    )
-            img = img.resize((int(img.width / scale), int(img.height / scale)))
+    parser.add_argument(
-            canv.paste(img, ((canv.width - img.width) // 2, (canv.height - img.height) // 2))
+        "-t",
-            with open(fp_out, "wb") as fp:
+        dest="textmode",
-                Converter(canv).export_binary(fp)
+        action="store_true",
+        help="Output a Lua script instead of binary image",
+    )
+    parser.add_argument(
+        "-W",
+        dest="width",
+        default=4 * 8 - 1,
+        type=int,
+        help="Width in characters",
+    )
+    parser.add_argument(
+        "-H",
+        dest="height",
+        default=3 * 6 - 2,
+        type=int,
+        help="Height in characters",
+    )
+    parser.add_argument(
+        "-p",
+        dest="placement",
+        choices=("center", "cover", "tile", "full", "extend", "fill"),
+        default="full",
+        help=dedent(
+            """\
+            Image placement mode (same as in hsetroot)
+                -p center       Render image centered on screen
+                -p cover        Centered on screen, scaled to fill fully
+                -p tile         Render image tiles
+                -p full         Maximum aspect ratio
+                -p extend       Same as "full" but filling borders
+                -p fill         Stretch to fill"""
+        ),
+    )
+    parser.add_argument("image_path")
+    parser.add_argument("output_path")
+
+    args = parser.parse_args()
+
+    with Image.new("RGB", (args.width * 2, args.height * 3)) as canv:
+        with Image.open(args.image_path).convert("RGB") as img:
+            if args.placement == "fill":
+                canv.paste(img.resize(canv.size), (0, 0))
+            elif args.placement in ("full", "extend", "cover"):
+                aspect = canv.width / img.width
+                if (img.height * aspect > canv.height) != (
+                    args.placement == "cover"
+                ):
+                    aspect = canv.height / img.height
+                new_w, new_h = int(img.width * aspect), int(
+                    img.height * aspect
+                )
+                top = int((canv.height - new_h) / 2)
+                left = int((canv.width - new_w) / 2)
+                resized_img = img.resize((new_w, new_h))
+                canv.paste(resized_img, (left, top))
+                if args.placement == "extend":
+                    if left > 0:
+                        right = left - 1 + new_w
+                        w = 1
+                        while right + w < canv.width:
+                            canv.paste(
+                                canv.crop(
+                                    (left + 1 - w, 0, left + 1, canv.height)
+                                ),
+                                (left + 1 - w * 2, 0),
+                            )
+                            canv.paste(
+                                canv.crop((right, 0, right + w, canv.height)),
+                                (right + w, 0),
+                            )
+                            w *= 2
+                    if top > 0:
+                        bottom = top - 1 + new_h
+                        h = 1
+                        while bottom + h < canv.height:
+                            canv.paste(
+                                canv.crop(
+                                    (0, top + 1 - h, canv.width, top + 1)
+                                ),
+                                (top + 1 - h * 2, 0),
+                            )
+                            canv.paste(
+                                canv.crop((0, bottom, canv.width, bottom + h)),
+                                (0, bottom + h),
+                            )
+                            h *= 2
+
+            elif args.placement in ("center", "tile"):
+                left = int((canv.width - img.width) / 2)
+                top = int((canv.height - img.height) / 2)
+                if args.placement == "tile":
+                    while left > 0:
+                        left -= img.width
+                    while top > 0:
+                        top -= img.height
+                    x = left
+                    while x < canv.width:
+                        y = top
+                        while y < canv.height:
+                            canv.paste(img, (x, y))
+                            y += img.height
+                        x += img.width
+                else:
+                    canv.paste(img, (left, top))
+            else:
+                pass
+
+            converter = Converter(canv)
+            converter._img.save("/tmp/_ccpictmp.png")
+            if args.textmode:
+                with open(args.output_path, "w") as fp:
+                    converter.export(fp)
+            else:
+                with open(args.output_path, "wb") as fp:
+                    converter.export_binary(fp)
+
 
 if __name__ == "__main__":
-    main(argv[1], argv[2])
+    main()
-