; Thomas's Skipdraw 
;========================================================================

;The best way, i knew until now, was (if y contains linecounter):
  tya                   ; 2
; sec                   ; 2 <- this can sometimes be avoided
  sbc SpriteEnd         ; 3
  adc #SPRITEHEIGHT     ; 2
  bcx .skipDraw         ; 2 = 9-11 cycles
; ...

; --------- or ------------

;If you like using illegal opcodes, you can use dcp (dec,cmp) here:
  lda #SPRITEHEIGHT     ; 2
  dcp SpriteEnd         ; 5     initial value has to be adjusted
  bcx .skipDraw         ; 2 = 9
; ...

;Advantages:
;- state of carry flag doesn't matter anymore (may save 2 cycles)
;- a remains constant, could be useful for a 2nd sprite
;- you could use the content of SpriteEnd instead of y for accesing sprite data
;- ???



;========================================================================
;An Example:
;
   ; skipDraw routine for right player
   TXA                          ; 2 A-> Current scannline
   SEC                          ; 2 Set Carry
   SBC slowP1YCoordFromBottom+1 ; 3 
   ADC #SPRITEHEIGHT+1          ; 2 calc if sprite is drawn
   BCC skipDrawRight            ; 2/3 To skip or not to skip?
   TAY                          ; 2
   lda P1Graphic,y              ; 4
continueRight:
   STA GRP0     

;----- this part outside of kernel

skipDrawRight        ; 3 from BCC
   LDA #0            ; 2
   BEQ continueRight ; 3 Return...