sbool bwRawImageSearch_verbose;
static BWImageSectionComparator bwRawImageSearch_comparator;
static int bwRawImageSearch_maxEntries = 1000;

static L<FoundImg> bwRawImageSearch(BWImage big, BWImage pat, float similarity) {
  ret bwRawImageSearch(big, pat, similarity, bwRawImageSearch_maxEntries);
}

// similarity = e.g. 0.99f
static L<FoundImg> bwRawImageSearch(BWImage big, BWImage pat, float similarity, int maxEntries) {
  new L<FoundImg> found;
  int wp = pat.getWidth(), hp = pat.getHeight();
  int w = big.getWidth(), h = big.getHeight();
  float maxError = (1f-similarity)*wp*hp;
  for (int y = 0; y < h-hp; y++)
    for (int x = 0; x < w-wp; x++) {
      float diff = bwRawImageSearch_comparator != null
         ? bwRawImageSearch_comparator.compare(big, pat, x, y, maxError)
         : bwImageSectionsSimilarity(big, pat, x, y, maxError);
      if (diff <= maxError) {
        float sim = 1-diff/(wp*hp);
        if (bwRawImageSearch_verbose)
          print("  Image found at " + x + "/" + y + " [sim: " + formatDouble(sim, 4) + "]");
        Rect r = new Rect(x, y, wp, hp);
        found.add(new FoundImg(r, sim));
        ping();
        if (l(found) >= maxEntries) ret found;
        x += wp-1;
      }
    }
  ret found;
}

Began life as a copy of #1005386