Notes on building an ANSI theme

YEARONE

.. use after free. trust after betrayal.

[ C O D E ]

02.10.2026 · 5 min

TITLE..........Notes on building an ANSI theme

DATE..........02.10.2026

TAGS..........ansi, nfo, css

SIZE..........5 min

Box-drawing characters, dithered blocks and a strict 80-column grid.

The logo is converted pixel by pixel into half-block cells using the classic 16-color palette.

[ src/halfblock.js ]

js · 13L

1// two pixels per cell: ▀ = fg on top, bg below

2function toHalfBlocks(img, cols) {

3 const rows = [];

4 for (let y = 0; y < img.height; y += 2) {

5 let line = '';

6 for (let x = 0; x < cols; x++) {

7 const top = img.get(x, y), bot = img.get(x, y + 1);

8 line += '\x1b[38;2;' + top + 'm\x1b[48;2;' + bot + 'm▀';

9 }

10 rows.push(line + '\x1b[0m');

11 }

12 return rows.join('\n'); // 0x1b: still the best escape

13}

-- READ ONLY -- utf-8 · js · 13 lines

// two pixels per cell: ▀ = fg on top, bg below
function toHalfBlocks(img, cols) {
  const rows = [];
  for (let y = 0; y < img.height; y += 2) {
    let line = '';
    for (let x = 0; x < cols; x++) {
      const top = img.get(x, y), bot = img.get(x, y + 1);
      line += '\x1b[38;2;' + top + 'm\x1b[48;2;' + bot + 'm▀';
    }
    rows.push(line + '\x1b[0m');
  }
  return rows.join('\n');  // 0x1b: still the best escape
}

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