Method blend_add_pin

core/src/processing/core/PImage.java:2447–2459

Add O = MIN(D + S, 1)

(int dst, int src)

   * O = MIN(D + S, 1)
   */
  private static int blend_add_pin(int dst, int src) {
    int a = src >>> 24;

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

    int rb = (dst & RB_MASK) + ((src & RB_MASK) * s_a >>> 8 & RB_MASK);
    int gn = (dst & GN_MASK) + ((src & GN_MASK) * s_a >>> 8);

    return min((dst >>> 24) + a, 0xFF) << 24 |
        min(rb & 0xFFFF0000, RED_MASK)   |
        min(gn & 0x00FFFF00, GREEN_MASK) |
        min(rb & 0x0000FFFF, BLUE_MASK);
  }


  /**