ComputerCraft Paletted Image thingie
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F0F6CFE11CDB0960
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#!/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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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))
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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 & 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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@ -0,0 +1,73 @@
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local colors_list = {
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colors.white,
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colors.orange,
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colors.magenta,
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colors.lightBlue,
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colors.yellow,
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colors.lime,
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colors.pink,
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colors.gray,
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colors.lightGray,
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colors.cyan,
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colors.purple,
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colors.blue,
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colors.brown,
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colors.green,
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colors.red,
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colors.black
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}
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local function load(path)
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local image = { w = 0, h = 0, scale = 1.0, palette = {}, lines = {} }
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local fp, err = io.open(path, "rb")
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if not fp then return nil, err end
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local magic = fp:read(4)
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if magic ~= "CCPI" then
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return nil, "Invalid header: expected CCPI got " .. magic
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end
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image.w, image.h = string.byte(fp:read(1)), string.byte(fp:read(1))
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for i = 1, 16 do
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image.palette[i] = bit32.lshift(string.byte(fp:read(1)), 16)
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image.palette[i] = bit32.bor(image.palette[i], bit32.lshift(string.byte(fp:read(1)), 8))
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image.palette[i] = bit32.bor(image.palette[i], string.byte(fp:read(1)))
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end
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for y = 1, image.h do
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local line = { s = "", bg = "", fg = "" }
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for x = 1, image.w do
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line.s = line.s .. fp:read(1)
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local color = string.byte(fp:read(1))
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line.bg = line.bg .. string.format("%x", bit32.band(0xF, color))
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line.bg = line.bg .. string.format("%x", bit32.band(0xF, bit32.rshift(color, 4)))
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end
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table.insert(image.lines, line)
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end
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fp:close()
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return image
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end
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local function draw(img, ox, oy, monitor)
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local t = monitor or term.current()
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ox = ox or 1
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oy = oy or 1
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for i = 1, 16 do
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t.setPaletteColor(colors_list[i], img.palette[i])
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end
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for y = 1, img.h do
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t.setCursorPos(ox, oy + y - 1)
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t.blit(img.lines[y].s, img.lines[y].fg, img.lines[y].bg)
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end
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end
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return {
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load = load,
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draw = draw
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}
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