Function removeOuterBackground

scripts/process-readme-buttons.mjs:21–52

(rgba, width, height)

}

function removeOuterBackground(rgba, width, height) {
  const visited = new Uint8Array(width * height);
  const queue = [];

  for (let x = 0; x < width; x++) {
    queue.push(x, 0, x, height - 1);
  }
  for (let y = 1; y < height - 1; y++) {
    queue.push(0, y, width - 1, y);
  }

  while (queue.length) {
    const y = queue.pop();
    const x = queue.pop();
    const idx = y * width + x;
    if (x < 0 || y < 0 || x >= width || y >= height || visited[idx]) continue;

    const i = idx * 4;
    const r = rgba[i];
    const g = rgba[i + 1];
    const b = rgba[i + 2];
    const a = rgba[i + 3];
    if (!isBackground(r, g, b, a)) continue;

    visited[idx] = 1;
    rgba[i + 3] = 0;

    queue.push(x + 1, y, x - 1, y, x, y + 1, x, y - 1);
  }

  return rgba;
}

function getBounds(rgba, width, height) {
  let minX = width;