Optimized _SetTextXY (#47)

In the process, I eliminated the unclipped version and the _SetTextConfig code that switched between it and the clipped version. The new clipped version is faster than the old unclipped version and should provide the same behavior given onscreen coordinates.

CEdev/lib/src/graphics/graphx/graphics_lib.asm

@@ -2615,36 +2615,14 @@ _SetTextXY:
 ;  arg1 : Text Y Pos
 ; Returns:
 ;  None
-	jp	_SetTextXY_ASM \.r
-SetTextXY_SMC =$-3
-_SetTextXY_ASM:
-	ld	hl,3
-	add	hl,sp                       ; hl -> arg0
-	ld	de,TextXPos_SMC \.r
-	ldi
-	ldi                                 ; copy in new x pos
-	inc	hl
-	ld	a,(hl)
-	ld	(TextYPos_SMC),a \.r        ; set new y pos
-	ret
-
-;-------------------------------------------------------------------------------
-_SetTextXY_Clip_ASM:
-; Sets the text X and Y positions
-; Arguments:
-;  arg0 : Text X Pos
-;  arg1 : Text Y Pos
-; Returns:
-;  None
-	ld	hl,3
-	add	hl,sp                       ; hl -> arg0
-	ld	de,TextXPos_SMC \.r
-	ldi
-	ldi
-	ldi                                 ; copy in new x pos
-	ld	hl,(hl)
-	ld	(TextYPos_SMC),hl \.r       ; set new y pos
-	ret
+	pop	de			; de=return address, sp=&xpos
+	pop	hl			; hl=xpos, sp=&ypos
+	ld	(TextXPos_SMC),hl \.r
+	ex	(sp),hl			; hl=ypos, ypos=don't care
+	ld	(TextYPos_SMC),hl \.r
+	push	hl			; xpos=don't care, sp=&xpos
+	ex	de,hl			; hl=return address
+	jp	(hl)
 	
 ;-------------------------------------------------------------------------------
 _PrintStringXY_Clip_ASM:
@@ -2780,12 +2758,10 @@ _SetTextConfig:
 	ret	nz
 	ld	de,_PrintChar_ASM \.r
 	ld	bc,_PrintStringXY_ASM \.r
-	ld	iy,_SetTextXY_ASM \.r
 	jr	SetCharSMC                  ; set unclipped character routine
 SetClipText:
 	ld	de,_PrintChar_Clip_ASM \.r
 	ld	bc,_PrintStringXY_Clip_ASM \.r
-	ld	iy,_SetTextXY_Clip_ASM \.r
 SetCharSMC:
 	ld	hl,PrintChar_SMC_0 \.r
 	ld	(hl),de                     ; holy crap what a hack
@@ -2798,9 +2774,6 @@ SetCharSMC:
 	push	bc
 	pop	hl
 	ld	(PrintStringXY_SMC),hl \.r ; change which text routines we want to use
-	push	iy
-	pop	hl
-	ld	(SetTextXY_SMC),hl \.r
 	or	a,a
 	sbc	hl,hl
 	ld	(TextYPos_SMC),hl \.r