docs: public Object getDataElements(int rgb, Object pixel) {
          int alpha = (rgb>>>24);
  
          int pix;
          if (alpha < ALPHA_THRESHOLD && getTransparentPixel() != -1) {
              pix = getTransparentPixel();
          }
          else {
              int color = rgb & RGB_MASK;
              if (color == WHITE && whiteIndex != -1) {
                  pix = whiteIndex;
              }
              else {
                  pix = inverseMap.getIndexNearest(color);
              }
          }
  
          return installpixel(pixel, pix);
      }