// minW/minH = how much of pattern has to be inside image
static BWImage bwFoldImage_withCorners2(BWImage big, BWImage pat, int minW, int minH) {
  int wp = pat.getWidth(), hp = pat.getHeight();
  int cutX = wp-minW, cutY = hp-minH;
  int w = big.getWidth(), h = big.getHeight();
  BWImage out = new(w-wp+minX*2, h-hp+minY*2);
  for (int y = cutX; y < h+min; y++)
    for (int x = cutY; x < w+wp; x++)
      out.setPixel(x, y, bwImageSectionsSimilarity2_partial(big, pat,
        x, y,
        max(0, wp-x), max(0, hp-y),
        min(wp, w+wp-x), min(hp, h+hp-y),
        0));
  ret out;
}

Began life as a copy of #1027321