@shockpkg/ria-packager/esm/util.mjs

Package for creating Adobe AIR packages

// @ts-expect-error: No types.
import { quoteForCmd, quoteForSh } from 'puka';
import { decodePngToRgba, encodeRgbaToPng } from '@shockpkg/icon-encoder';

/**
 * Trim dot flash from head of path.
 *
 * @param path Path string.
 * @returns Trimmed path.
 */
export function trimDotSlash(path) {
  return path.replace(/^(\.\/)+/, '');
}

/**
 * Find path relative from base, if base matches.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns path, or null.
 */
export function pathRelativeBase(path, start, nocase = false) {
  const p = trimDotSlash(nocase ? path.toLowerCase() : path);
  const s = trimDotSlash(nocase ? start.toLowerCase() : start);
  if (p === s) {
    return '';
  }
  if (p.startsWith(`${s}/`)) {
    return path.slice(s.length + 1);
  }
  return null;
}

/**
 * Same as pathRelativeBase, but retuns true on a match, else false.
 *
 * @param path Path to match against.
 * @param start Search start.
 * @param nocase Match case-insensitive.
 * @returns Returns true on match, else false.
 */
export function pathRelativeBaseMatch(path, start, nocase = false) {
  return pathRelativeBase(path, start, nocase) !== null;
}

/**
 * Align integer.
 *
 * @param i Integer value.
 * @param align Alignment amount.
 * @returns Aligned integer.
 */
export function align(i, align) {
  const o = i % align;
  return o ? align - o + i : i;
}

/**
 * Quote string for SH.
 *
 * @param str String to be quoted.
 * @returns Quoted string.
 */
export function quoteSh(str) {
  return quoteForSh(str);
}

/**
 * Quote string for CMD.
 *
 * @param str String to be quoted.
 * @returns Quoted string.
 */
export function quoteCmd(str) {
  return quoteForCmd(str);
}

/**
 * Resize RGBA image data down by exactly half.
 * Input dimensions must be a power of 2.
 *
 * @param rgba Image data.
 * @returns Image data.
 */
function resizeRgbaHalf(rgba) {
  const {
    width: ww,
    height: hh,
    data: dd
  } = rgba;
  const w = ww / 2;
  const h = hh / 2;
  const d = new Uint8Array(w * h * 4);
  const r = {
    width: w,
    height: h,
    data: d
  };
  const w4 = w * 4;
  const ww4 = ww * 4;
  for (let y = 0, yy = 0; y < h; y++, yy += 2) {
    const yi = y * w4;
    const yyi = yy * ww4;
    const yyj = (yy + 1) * ww4;
    for (let x = 0, xx = 0; x < w; x++, xx += 2) {
      const xi = x * 4;
      const xxi = xx * 4;
      const xxj = (xx + 1) * 4;
      let p0 = yyi + xxi;
      let p1 = yyi + xxj;
      let p2 = yyj + xxi;
      let p3 = yyj + xxj;
      const r0 = dd[p0++];
      const r1 = dd[p1++];
      const r2 = dd[p2++];
      const r3 = dd[p3++];
      const g0 = dd[p0++];
      const g1 = dd[p1++];
      const g2 = dd[p2++];
      const g3 = dd[p3++];
      const b0 = dd[p0++];
      const b1 = dd[p1++];
      const b2 = dd[p2++];
      const b3 = dd[p3++];
      const a0 = dd[p0];
      const a1 = dd[p1];
      const a2 = dd[p2];
      const a3 = dd[p3];
      const a4 = a0 + a1 + a2 + a3;
      let a04 = 0;
      let a14 = 0;
      let a24 = 0;
      let a34 = 0;
      if (a4) {
        a04 = a0 / a4;
        a14 = a1 / a4;
        a24 = a2 / a4;
        a34 = a3 / a4;
      }
      let p = yi + xi;
      d[p++] = Math.round(r0 * a04 + r1 * a14 + r2 * a24 + r3 * a34);
      d[p++] = Math.round(g0 * a04 + g1 * a14 + g2 * a24 + g3 * a34);
      d[p++] = Math.round(b0 * a04 + b1 * a14 + b2 * a24 + b3 * a34);
      d[p] = Math.round(a4 / 4);
    }
  }
  return r;
}

/**
 * Resize RGBA image data down by exactly half.
 * Input dimensions must be a power of 2, else error is thrown.
 * If resizing multiple steps, each step dimensions must be a power of 2.
 *
 * @param png PNG data.
 * @param x Number of times to resize down by half.
 * @returns PNG data.
 */
export async function pngHalfSize(png, x = 1) {
  let rgba = await decodePngToRgba(png);
  if ((x = Math.round(x)) > 0) {
    const p = 2 ** x;
    const {
      width,
      height
    } = rgba;
    if (width % 1 || height % 1) {
      throw new Error(`Image dimensions not a power of ${p}: ${width}x${height}`);
    }
    for (let i = 0; i < x; i++) {
      rgba = resizeRgbaHalf(rgba);
    }
  }
  return encodeRgbaToPng(rgba);
}
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