123 lines
6.5 KiB
TypeScript
123 lines
6.5 KiB
TypeScript
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/**
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* Minimal 8x8 bitmap font for baking captions onto screenshot composites.
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*
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* Glyphs are the public-domain `font8x8_basic` set (Daniel Hepper's font8x8,
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* https://github.com/dhepper/font8x8 — public domain / "do whatever you want"),
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* printable ASCII 0x20–0x7E, plus a custom middle-dot (·, 0xB7) used as the label
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* separator. Public domain, so fine to embed under our GPLv3.
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*
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* Each glyph is 8 row-bytes (top→bottom). Within a row byte, bit `c` (LSB = 0) is
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* column `c`, left→right: pixel (c,row) is set iff `(byte >> c) & 1`.
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*/
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// prettier-ignore
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const GLYPHS: Record<string, number[]> = {
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' ': [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
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'!': [0x18, 0x3c, 0x3c, 0x18, 0x18, 0x00, 0x18, 0x00],
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'"': [0x36, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
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'#': [0x36, 0x36, 0x7f, 0x36, 0x7f, 0x36, 0x36, 0x00],
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'$': [0x0c, 0x3e, 0x03, 0x1e, 0x30, 0x1f, 0x0c, 0x00],
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'%': [0x00, 0x63, 0x33, 0x18, 0x0c, 0x66, 0x63, 0x00],
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'&': [0x1c, 0x36, 0x1c, 0x6e, 0x3b, 0x33, 0x6e, 0x00],
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"'": [0x06, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00],
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'(': [0x18, 0x0c, 0x06, 0x06, 0x06, 0x0c, 0x18, 0x00],
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')': [0x06, 0x0c, 0x18, 0x18, 0x18, 0x0c, 0x06, 0x00],
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'*': [0x00, 0x66, 0x3c, 0xff, 0x3c, 0x66, 0x00, 0x00],
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'+': [0x00, 0x0c, 0x0c, 0x3f, 0x0c, 0x0c, 0x00, 0x00],
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',': [0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x0c, 0x06],
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'-': [0x00, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x00],
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'.': [0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0x0c, 0x00],
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'/': [0x60, 0x30, 0x18, 0x0c, 0x06, 0x03, 0x01, 0x00],
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'0': [0x3e, 0x63, 0x73, 0x7b, 0x6f, 0x67, 0x3e, 0x00],
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'1': [0x0c, 0x0e, 0x0c, 0x0c, 0x0c, 0x0c, 0x3f, 0x00],
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'2': [0x1e, 0x33, 0x30, 0x1c, 0x06, 0x33, 0x3f, 0x00],
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'3': [0x1e, 0x33, 0x30, 0x1c, 0x30, 0x33, 0x1e, 0x00],
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'4': [0x38, 0x3c, 0x36, 0x33, 0x7f, 0x30, 0x78, 0x00],
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'5': [0x3f, 0x03, 0x1f, 0x30, 0x30, 0x33, 0x1e, 0x00],
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'6': [0x1c, 0x06, 0x03, 0x1f, 0x33, 0x33, 0x1e, 0x00],
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'7': [0x3f, 0x33, 0x30, 0x18, 0x0c, 0x0c, 0x0c, 0x00],
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'8': [0x1e, 0x33, 0x33, 0x1e, 0x33, 0x33, 0x1e, 0x00],
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'9': [0x1e, 0x33, 0x33, 0x3e, 0x30, 0x18, 0x0e, 0x00],
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':': [0x00, 0x0c, 0x0c, 0x00, 0x00, 0x0c, 0x0c, 0x00],
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';': [0x00, 0x0c, 0x0c, 0x00, 0x00, 0x0c, 0x0c, 0x06],
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'<': [0x18, 0x0c, 0x06, 0x03, 0x06, 0x0c, 0x18, 0x00],
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'=': [0x00, 0x00, 0x3f, 0x00, 0x00, 0x3f, 0x00, 0x00],
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'>': [0x06, 0x0c, 0x18, 0x30, 0x18, 0x0c, 0x06, 0x00],
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'?': [0x1e, 0x33, 0x30, 0x18, 0x0c, 0x00, 0x0c, 0x00],
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'@': [0x3e, 0x63, 0x7b, 0x7b, 0x7b, 0x03, 0x1e, 0x00],
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'A': [0x0c, 0x1e, 0x33, 0x33, 0x3f, 0x33, 0x33, 0x00],
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'B': [0x3f, 0x66, 0x66, 0x3e, 0x66, 0x66, 0x3f, 0x00],
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'C': [0x3c, 0x66, 0x03, 0x03, 0x03, 0x66, 0x3c, 0x00],
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'D': [0x1f, 0x36, 0x66, 0x66, 0x66, 0x36, 0x1f, 0x00],
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'E': [0x7f, 0x46, 0x16, 0x1e, 0x16, 0x46, 0x7f, 0x00],
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'F': [0x7f, 0x46, 0x16, 0x1e, 0x16, 0x06, 0x0f, 0x00],
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'G': [0x3c, 0x66, 0x03, 0x03, 0x73, 0x66, 0x7c, 0x00],
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'H': [0x33, 0x33, 0x33, 0x3f, 0x33, 0x33, 0x33, 0x00],
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'I': [0x1e, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x1e, 0x00],
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'J': [0x78, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1e, 0x00],
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'K': [0x67, 0x66, 0x36, 0x1e, 0x36, 0x66, 0x67, 0x00],
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'L': [0x0f, 0x06, 0x06, 0x06, 0x46, 0x66, 0x7f, 0x00],
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'M': [0x63, 0x77, 0x7f, 0x7f, 0x6b, 0x63, 0x63, 0x00],
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'N': [0x63, 0x67, 0x6f, 0x7b, 0x73, 0x63, 0x63, 0x00],
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'O': [0x1c, 0x36, 0x63, 0x63, 0x63, 0x36, 0x1c, 0x00],
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'P': [0x3f, 0x66, 0x66, 0x3e, 0x06, 0x06, 0x0f, 0x00],
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'Q': [0x1e, 0x33, 0x33, 0x33, 0x3b, 0x1e, 0x38, 0x00],
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'R': [0x3f, 0x66, 0x66, 0x3e, 0x36, 0x66, 0x67, 0x00],
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'S': [0x1e, 0x33, 0x07, 0x0e, 0x38, 0x33, 0x1e, 0x00],
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'T': [0x3f, 0x2d, 0x0c, 0x0c, 0x0c, 0x0c, 0x1e, 0x00],
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'U': [0x33, 0x33, 0x33, 0x33, 0x33, 0x33, 0x3f, 0x00],
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'V': [0x33, 0x33, 0x33, 0x33, 0x33, 0x1e, 0x0c, 0x00],
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'W': [0x63, 0x63, 0x63, 0x6b, 0x7f, 0x77, 0x63, 0x00],
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'X': [0x63, 0x63, 0x36, 0x1c, 0x1c, 0x36, 0x63, 0x00],
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'Y': [0x33, 0x33, 0x33, 0x1e, 0x0c, 0x0c, 0x1e, 0x00],
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'Z': [0x7f, 0x63, 0x31, 0x18, 0x4c, 0x66, 0x7f, 0x00],
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'[': [0x1e, 0x06, 0x06, 0x06, 0x06, 0x06, 0x1e, 0x00],
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'\\': [0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0x40, 0x00],
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']': [0x1e, 0x18, 0x18, 0x18, 0x18, 0x18, 0x1e, 0x00],
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'^': [0x08, 0x1c, 0x36, 0x63, 0x00, 0x00, 0x00, 0x00],
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'_': [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff],
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'`': [0x0c, 0x0c, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00],
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'a': [0x00, 0x00, 0x1e, 0x30, 0x3e, 0x33, 0x6e, 0x00],
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'b': [0x07, 0x06, 0x06, 0x3e, 0x66, 0x66, 0x3b, 0x00],
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'c': [0x00, 0x00, 0x1e, 0x33, 0x03, 0x33, 0x1e, 0x00],
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'd': [0x38, 0x30, 0x30, 0x3e, 0x33, 0x33, 0x6e, 0x00],
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'e': [0x00, 0x00, 0x1e, 0x33, 0x3f, 0x03, 0x1e, 0x00],
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'f': [0x1c, 0x36, 0x06, 0x0f, 0x06, 0x06, 0x0f, 0x00],
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'g': [0x00, 0x00, 0x6e, 0x33, 0x33, 0x3e, 0x30, 0x1f],
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'h': [0x07, 0x06, 0x36, 0x6e, 0x66, 0x66, 0x67, 0x00],
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'i': [0x0c, 0x00, 0x0e, 0x0c, 0x0c, 0x0c, 0x1e, 0x00],
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'j': [0x30, 0x00, 0x30, 0x30, 0x30, 0x33, 0x33, 0x1e],
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'k': [0x07, 0x06, 0x66, 0x36, 0x1e, 0x36, 0x67, 0x00],
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'l': [0x0e, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x1e, 0x00],
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'm': [0x00, 0x00, 0x33, 0x7f, 0x7f, 0x6b, 0x63, 0x00],
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'n': [0x00, 0x00, 0x1f, 0x33, 0x33, 0x33, 0x33, 0x00],
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'o': [0x00, 0x00, 0x1e, 0x33, 0x33, 0x33, 0x1e, 0x00],
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'p': [0x00, 0x00, 0x3b, 0x66, 0x66, 0x3e, 0x06, 0x0f],
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'q': [0x00, 0x00, 0x6e, 0x33, 0x33, 0x3e, 0x30, 0x78],
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'r': [0x00, 0x00, 0x3b, 0x6e, 0x66, 0x06, 0x0f, 0x00],
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's': [0x00, 0x00, 0x3e, 0x03, 0x1e, 0x30, 0x1f, 0x00],
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't': [0x08, 0x0c, 0x3e, 0x0c, 0x0c, 0x2c, 0x18, 0x00],
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'u': [0x00, 0x00, 0x33, 0x33, 0x33, 0x33, 0x6e, 0x00],
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'v': [0x00, 0x00, 0x33, 0x33, 0x33, 0x1e, 0x0c, 0x00],
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'w': [0x00, 0x00, 0x63, 0x6b, 0x7f, 0x7f, 0x36, 0x00],
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'x': [0x00, 0x00, 0x63, 0x36, 0x1c, 0x36, 0x63, 0x00],
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'y': [0x00, 0x00, 0x33, 0x33, 0x33, 0x3e, 0x30, 0x1f],
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'z': [0x00, 0x00, 0x3f, 0x19, 0x0c, 0x26, 0x3f, 0x00],
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'{': [0x38, 0x0c, 0x0c, 0x07, 0x0c, 0x0c, 0x38, 0x00],
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'|': [0x18, 0x18, 0x18, 0x00, 0x18, 0x18, 0x18, 0x00],
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'}': [0x07, 0x0c, 0x0c, 0x38, 0x0c, 0x0c, 0x07, 0x00],
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'~': [0x6e, 0x3b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00],
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'·': [0x00, 0x00, 0x00, 0x18, 0x18, 0x00, 0x00, 0x00], // custom middle-dot separator
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};
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const BLANK = GLYPHS[' '];
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/** 8 row-bytes for a character; falls back to a blank cell for anything unmapped. */
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export function glyphFor(ch: string): number[] {
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return GLYPHS[ch] ?? BLANK;
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}
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/** Whether a character has a real glyph (used for width estimation / fitting). */
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export function hasGlyph(ch: string): boolean {
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return ch in GLYPHS;
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}
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