54 lines
1.6 KiB
Python
54 lines
1.6 KiB
Python
from typing import Tuple
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from PIL import Image
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import sys
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def main(font_name, n_glyphs, fname_png, fname_c):
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glyphs = load_glyphs(fname_png)
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assert(len(glyphs) == n_glyphs), f"must be exactly {n_glyphs} glyphs"
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with open(fname_c, "wt") as output:
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output.writelines([
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"// generated code! be nice!\n",
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"#include \"sys/sys.h\";\n",
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f"sys_glyph {font_name}[{n_glyphs}] = {{{', '.join(str(g) for g in glyphs)}}};\n"
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])
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def load_glyphs(fname_png: str):
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with Image.open(fname_png) as im:
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width = im.width
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height = im.height
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assert width % 8 == 0, "width must be a multiple of 8"
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assert height % 8 == 0, "height must be a multiple of 8"
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data = list(im.convert("RGBA").getdata())
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monochrome = [pixel_to_monochrome(p) for p in data]
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glyphs = []
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for gy in range(0, height, 8):
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for gx in range(0, width, 8):
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glyph = 0
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for py in range(0, 8):
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for px in range(0, 8):
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x = gx + px
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y = gy + py
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if monochrome[y * width + x]:
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glyph |= 1 << (py * 8 + px)
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glyphs.append(glyph)
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return glyphs
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def pixel_to_monochrome(rgba: Tuple[int, int, int, int]):
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if rgba[3] < 128: return False
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if (rgba[0] + rgba[1] + rgba[2])/3 < 128: return False
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return True
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if __name__ == "__main__":
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assert len(sys.argv) == 5, \
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"there must be four args (font name, n glyphs, src png, out c)"
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main(sys.argv[1], int(sys.argv[2]), sys.argv[3], sys.argv[4])
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