ascii-artist/dist/encode.js

ascii artist

import { toAscii } from "./share";
export const encode = (pixels, width, height) => {
    const w = Math.ceil(width / 2);
    const h = Math.ceil(height / 4);
    let data = [];
    for (let y = 0; y < h; y++) {
        let s = "";
        for (let x = 0; x < w; x++) {
            const _x = x << 1;
            const _y = y << 2;
            const block = [];
            for (let offsetY = 0; offsetY < 4; offsetY++) {
                for (let offsetX = 0; offsetX < 2; offsetX++) {
                    block.push([_x + offsetX, _y + offsetY]);
                }
            }
            let n = 0;
            block.forEach(([_x, _y], _p) => {
                if (_x >= width || _y >= height)
                    return;
                if (pixels[_x + _y * width]) {
                    n += 1 << _p;
                }
            });
            s += toAscii[n];
        }
        data.push(s);
    }
    return data;
};
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