129 lines
4.5 KiB
Python
129 lines
4.5 KiB
Python
#!/usr/bin/env python3
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# x-run: python3 % ~/downloads/kanade/6bf3cdae12b75326e3c23af73105e5781e42e94e.jpg
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from typing import BinaryIO, TextIO
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from PIL import Image
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from sys import argv
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class Converter:
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CC_COLORS = [
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("0", "colors.white"),
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("1", "colors.orange"),
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("2", "colors.magenta"),
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("3", "colors.lightBlue"),
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("4", "colors.yellow"),
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("5", "colors.lime"),
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("6", "colors.pink"),
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("7", "colors.gray"),
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("8", "colors.lightGray"),
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("9", "colors.cyan"),
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("a", "colors.purple"),
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("b", "colors.blue"),
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("c", "colors.brown"),
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("d", "colors.green"),
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("e", "colors.red"),
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("f", "colors.black"),
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]
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PIX_BITS = [
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[ 1, 2 ],
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[ 4, 8 ],
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[ 16, 0 ]
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]
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MAX_DIFF = (3 ** 0.5) * 255
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def __init__(self, image: Image.Image, size: tuple[int, int]):
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self._img = image.copy()
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self._img.thumbnail(( size[0] * 2, size[1] * 3 ))
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self._img = self._img.convert("P", palette=Image.ADAPTIVE, colors=16)
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self._palette: list[int] = self._img.getpalette() # type: ignore
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def _brightness(self, i: int) -> float:
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r, g, b = self._palette[i * 3 : (i + 1) * 3]
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return (r + g + b) / 768
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def _distance(self, a: int, b: int) -> float:
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r1, g1, b1 = self._palette[a * 3 : (a + 1) * 3]
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r2, g2, b2 = self._palette[b * 3 : (b + 1) * 3]
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return ((r1 - r2) ** 2 + (g1 - g2) ** 2 + (b1 - b2) ** 2) ** 0.5 / self.MAX_DIFF
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def _get_colors(self, x: int, y: int) -> tuple[int, int]:
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brightest_i, brightest_l = 0, 0
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darkest_i, darkest_l = 0, 768
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for oy, line in enumerate(self.PIX_BITS):
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for ox, bit in enumerate(line):
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pix = self._img.getpixel((x + ox, y + oy))
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brightness = self._brightness(pix)
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if brightness > brightest_l:
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brightest_l, brightest_i = brightness, pix
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if brightness < darkest_l:
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darkest_l, darkest_i = brightness, pix
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return darkest_i, brightest_i
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def _is_darker(self, bg: int, fg: int, c: int) -> bool:
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return self._distance(bg, c) < self._distance(fg, c)
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def _get_block(self, x: int, y: int) -> tuple[int, int, int]:
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dark_i, bri_i = self._get_colors(x, y)
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out: int = 0
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for oy, line in enumerate(self.PIX_BITS):
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for ox, bit in enumerate(line):
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if not self._is_darker(dark_i, bri_i, self._img.getpixel((x + ox, y + oy))):
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out |= bit
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# bottom right pixel fix?
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if self._is_darker(dark_i, bri_i, self._img.getpixel((x + 1, y + 2))):
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out ^= 31
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dark_i, bri_i = bri_i, dark_i
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return out, dark_i, bri_i
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def export_binary(self, io: BinaryIO):
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io.write(b"CCPI")
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io.write(bytes([self._img.width // 2, self._img.height // 3, 0]))
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io.write(bytes(self._palette[: 16 * 3]))
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for y in range(0, self._img.height - 2, 3):
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for x in range(0, self._img.width - 1, 2):
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ch, bg, fg = self._get_block(x, y)
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io.write(bytes([
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(ch + 0x80) & 0xFF,
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fg << 4 | bg
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]))
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def export(self, io: TextIO):
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io.write("local m = peripheral.find('monitor')\n")
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io.write("m.setTextScale(0.5)\n")
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io.write(f"-- image: {self._img.width}x{self._img.height}\n")
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io.write("\n")
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io.write("-- configuring palette\n")
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for i in range(16):
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r, g, b = self._palette[i * 3 : (i + 1) * 3]
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io.write(f"m.setPaletteColor({self.CC_COLORS[i][1]}, 0x{r:02x}{g:02x}{b:02x})\n")
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io.write("\n")
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io.write("-- writing pixels\n")
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for i, y in enumerate(range(0, self._img.height - 2, 3), 1):
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s = []
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bgs = ""
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fgs = ""
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io.write(f"m.setCursorPos(1, {i}); ")
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for x in range(0, self._img.width - 1, 2):
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ch, bg, fg = self._get_block(x, y)
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s.append(ch + 0x80)
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bgs += self.CC_COLORS[bg][0]
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fgs += self.CC_COLORS[fg][0]
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io.write("m.blit(string.char(%s), '%s', '%s')\n" % (
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str.join(", ", map(str, s)),
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fgs,
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bgs
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))
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def main(fp_in, fp_out):
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with Image.open(fp_in) as img:
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with open(fp_out, "wb") as fp:
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Converter(img, (164, 81)).export_binary(fp)
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if __name__ == "__main__":
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main(argv[1], argv[2])
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