Method blend_lightest

core/src/processing/core/PImage.java:2632–2645

Lightest O = MAX(D, S)

(int dst, int src)

   * O = MAX(D, S)
   */
  private static int blend_lightest(int dst, int src) {
    int a = src >>> 24;

    int s_a = a + (a >= 0x7F ? 1 : 0);
    int d_a = 0x100 - s_a;

    int rb = max(src & RED_MASK,   dst & RED_MASK) |
             max(src & BLUE_MASK,  dst & BLUE_MASK);
    int gn = max(src & GREEN_MASK, dst & GREEN_MASK);

    return min((dst >>> 24) + a, 0xFF) << 24 |
        ((dst & RB_MASK) * d_a + rb * s_a) >>> 8 & RB_MASK |
        ((dst & GN_MASK) * d_a + gn * s_a) >>> 8 & GN_MASK;
  }


  /**