Dmitry Sergeev
54 lines
1.5 KiB
Python
54 lines
1.5 KiB
Python
#!/usr/bin/env python3
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"""Bake an 8x16 1-bpp bitmap font (ASCII 32..127) from DejaVu Sans Mono 13px.
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Output: Go source file with the atlas. One byte per glyph row, bit n = pixel
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at column n (LSB = leftmost), matching the kernel's (row >> col) & 1 lookup.
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"""
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from PIL import Image, ImageDraw, ImageFont
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FONT = "/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf"
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SIZE = 13
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BASELINE = 12 # baseline row inside the 16px cell
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THRESH = 110
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font = ImageFont.truetype(FONT, SIZE)
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atlas = []
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for c in range(32, 128):
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img = Image.new("L", (8, 16), 0)
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d = ImageDraw.Draw(img)
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d.text((0, BASELINE), chr(c), font=font, fill=255, anchor="ls")
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px = img.load()
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for y in range(16):
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b = 0
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for x in range(8):
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if px[x, y] >= THRESH:
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b |= 1 << x
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atlas.append(b)
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def art(c):
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print(f"--- '{chr(c)}' ---")
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for y in range(16):
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row = atlas[(c - 32) * 16 + y]
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print("".join("#" if (row >> x) & 1 else "." for x in range(8)))
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for c in "AgM%m0(":
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art(ord(c))
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lines = []
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for i in range(0, len(atlas), 16):
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chunk = ", ".join(f"0x{b:02X}" for b in atlas[i:i+16])
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lines.append(f"\t{chunk},")
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body = "\n".join(lines)
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src = f'''package generator
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// 8x16 1-bpp bitmap font baked from DejaVu Sans Mono {SIZE}px (public-domain
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// style console glyphs). ASCII 32..127, one byte per row, LSB = leftmost pixel.
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var fontAtlas8x16 = [96 * 16]byte{{
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{body}
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}}
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'''
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with open("internal/generator/font.go", "w") as f:
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f.write(src)
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print("wrote internal/generator/font.go,", len(atlas), "bytes of glyph data")
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