_addPixels
    fmovem.x    l1149,-(a7)
    movem.l l1148,-(a7)
   movem.l d0/d1/d2/d3/d4/d5/d6/a2/a3,-(a7)
   move.l   #$80808080,d4
   moveq.w  #4,d0
   lsr.l    #1,d3
   bcc      .prePixel2
   move.l   (a2),d1
   move.l   (a3)+,d2
   add.l    d2,d1
   move.l   d1,d2
   and.l    d4,d2
   lsr.l    #1,d2
   sub.l    d2,d1
   move.l   d1,(a2)+
.prePixel2:
   tst.l   d3
   beq     .skip
   move.l   (a3)+,d2
.addPixelLoop2:
   movem.l  (a2),d1/d6
   add.l    d2,d1
   move.l   (a3)+,d5
   move.l   d1,d2
   add.l    d5,d6
   and.l    d4,d2
   move.l   d1,(a2)+
   and.l    d4,d5
   move.l   (a3)+,d2
   move.l   d6,(a2)+
   subq.l   #1,d3
   bne     .addPixelLoop2
.skip:
   movem.l (a7)+,d0/d1/d2/d3/d4/d5/d6/a2/a3
l1148   reg
l1149   freg
l1150   equ 0
    rts