;
;	File:		Regions.a
;
;	Contains:	QuickDraw routines to operate on regions.
;
;	Copyright:	© 1981-1992 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;	   <SM4>	 1/25/93	kc		Roll in Shannon Holland's alpha channel fix to DrawRgn.
;	   <SM3>	 6/11/92	stb		<sm 6/9/92>stb Synch with QDciPatchROM.a; comments added to
;									StdRgn, MapRgn
;	   <SM2>	 5/21/92	kc		Change the name of QuickDraws wrapper for NewHandle to
;									NewHandleWrapper to avoid name conflict with the glue.
;		<10>	 8/22/91	JSM		Don’t use TRUE and FALSE as labels.
;		 <9>	 7/23/91	KON		Fix 32-bit clean crimes in BitMapRgn.
;		 <8>	10/30/90	KON		Forgot to make all the changes before checking in; This updates
;									to the current version on the ci in QDciPatch. [SMC]
;		 <7>	10/30/90	KON		Make pmVersion=4 pixmaps work and create rgns as large as 64K
;									(not 32K).
;		 <6>	  9/7/90	KON		Fix misleading comment and enter Comment of the Week contest.
;		 <5>	  9/7/90	KON		Don't remap wideopen rectangular regions since maprect will blow
;									up.
;		 <4>	 8/28/90	KON		Remove benign redefinition of pixmapTooDeepErr (-148) which is
;									now defined in SysErr.a.
;		 <3>	  8/2/90	gbm		change TEMPRECT to TEMPRECTANGLE to avoid global conflict
;		 <2>	 7/24/90	gbm		axe duplicate defs
;	  <•1.6>	 7/14/89	BAL		For Aurora: Final CQD
;	   <1.5>	 6/30/89	BAL		Now uses equate for qdStackXtra
;	  <•1.4>	 5/29/89	BAL		Blasting in 32-Bit QuickDraw version 1.0 Final
;				 9/26/88	BAL		Provided RectWithinRgn, a variant of TrimRect
;				 9/25/88	BAL		Rewrote TrimRect for a better than 5X performance improvement
;				 11/8/87	DAF		Fixed pict opcode recorded by StdRgn
;				  6/4/87	CRC		set patMode even if user forgets to
;				  1/3/87	CRC		pass color param to stretch
;				 10/9/86	EHB		Added mask parameters to stretchbits calls
;				  9/5/86	EHB		Added FillCRgn
;				 8/16/86	EHB		In FillRgn added support for color grafports
;				 6/18/86	EHB		Fixed up references to PortBits in DrawRgn for color ports Call
;									StretchBits instead of RgnBlt
;

		BLANKS	ON
		STRING	ASIS

;-----------------------------------------------------------
;
;
;	  ****	 *****	 ***   ***	 ***   *   *   ***
;	  *   *  *		*	*	*	*	*  *   *  *   *
;	  *   *  *		*		*	*	*  **  *  *
;	  ****	 ***	*  **	*	*	*  * * *   ***
;	  * *	 *		*	*	*	*	*  *  **	  *
;	  *  *	 *		*	*	*	*	*  *   *  *   *
;	  *   *  *****	 ***   ***	 ***   *   *   ***
;
;-----------------------------------------------------------

StdRgn	PROC  EXPORT
		IMPORT PutPicVerb,DPutPicOp,PutPicRgn
		IMPORT PutRgn,FrRgn,PushVerb,DrawRgn,StdDevLoop
;---------------------------------------------------------------
;
;  PROCEDURE StdRgn(verb: GrafVerb; rgn: RgnHandle);
;
;  A6 OFFSETS OF PARAMS AFTER LINK:
;
; has fix from QDciPatchROM.a												<sm 6/9/92>stb

PARAMSIZE	EQU 	6
VERB		EQU 	PARAMSIZE+8-2			;GRAFVERB
RGN 		EQU 	VERB-4					;LONG, RGNHANDLE

		LINK	A6,#0						;NO LOCALS
		MOVEM.L D6-D7/A2-A4,-(SP)			;SAVE REGS
		MOVEQ	#0,D7						;CLEAR LOWORD OF PICT OPCODE <C952/08Nov87> DAF
		MOVE.B	VERB(A6),D7 				;GET VERB
		_CheckPic							;SET UP A4,A3 AND CHECK PICSAVE
		BLE.S	NOTPIC						;BRANCH IF NOT PICSAVE

		MOVE.B	D7,-(SP)					;PUSH VERB
		JSR		PutPicVerb					;PUT ADDITONAL PARAMS TO THEPIC
		MOVE	#$80,D0 					;PUT RGNNOUN IN HI NIBBLE
		ADD 	D7,D0						;PUT VERB IN LO NIBBLE
		JSR		DPutPicOp					;PUT OPCODE TO THEPIC
		MOVE.L	RGN(A6),-(SP)				;PUSH RGNHANDLE
		JSR 	PutPicRgn					;PUT REGION TO THEPIC

;  CALL STANDARD LOOP TO DRAW TO ALL DEVICES

NOTPIC	PEA		StdDraw						;PUSH ADDRESS OF DRAW ROUTINE
		PEA		GetRect						;PUSH ADDRESS OF RECT ROUTINE
		_StdDevLoop							;DRAW TO ALL DEVICES

GOHOME	MOVEM.L (SP)+,D6-D7/A2-A4			;RESTORE REGS
		UNLINK	PARAMSIZE,'STDRGN  '


;---------------------------------------------------------------
;
;	PROCEDURE GetRect(VAR theRect: rect); 
;
;	RETURN THE OBJECT'S RECTANGLE
;
GetRect	MOVE.L	(SP)+,D0					;GET RETURN ADDRESS
		MOVE.L	(SP)+,A1					;GET DST RECT
		MOVE.L	RGN(A6),A0					;GET REGION
		MOVE.L	(A0),A0						;POINT AT IT
		LEA		RGNBBOX(A0),A0				;POINT TO BOUNDING BOX
		MOVE.L	(A0)+,(A1)+					;SET TOPLEFT
		MOVE.L	(A0),(A1)					;SET BOTRIGHT
		MOVE.L	D0,A0						;GET RETURN ADDRESS
		JMP		(A0)						;AND RETURN


;---------------------------------------------------------------
;
;	PROCEDURE StdDraw; 
;
;	DRAW THE OBJECT
;
StdDraw	MOVE.L	RGN(A6),-(SP)				;PUSH RGNHANDLE
		_PushVerb							;PUSH MODE AND PATTERN
		TST.B	D7							;IS VERB FRAME ?
		BNE.S	NOTFR						;NO, CONTINUE
		TST.L	RGNSAVE(A3) 				;YES, IS RGNSAVE TRUE ?
		BEQ.S	NOTRGN						;NO, CONTINUE
		MOVE.L	RGN(A6),-(SP)				;YES, PUSH RGNHANDLE
		MOVE.L	RGNBUF(A4),-(SP)			;PUSH RGNBUF
		PEA 	RGNINDEX(A4)				;PUSH VAR RGNINDEX
		PEA 	RGNMAX(A4)					;PUSH VAR RGNMAX
		_PutRgn								;ADD INVERSION PTS TO THERGN

NOTRGN	JSR 	FrRgn						;FrRgn(rgn,pnMode,pnPat)
		BRA.S	drawDone

NOTFR	JSR 	DrawRgn 					;DrawRgn(rgn,mode,pat);
drawDone
DONE	RTS
		


FrameRgn	PROC	EXPORT	
			EXPORT	CallRgn,PaintRgn,EraseRgn,InvertRgn,FillRgn,FillCRgn
			IMPORT	SetFillPat
;-----------------------------------------------------
;
;  PROCEDURE FrameRgn(* rgn: RgnHandle *);
;
		MOVEQ	#FRAME,D0					;VERB = FRAME
		BRA.S	CallRgn 					;SHARE COMMON CODE


;-----------------------------------------------------
;
;  PROCEDURE PaintRgn(* rgn: RgnHandle *);
;
PaintRgn
		MOVEQ	#PAINT,D0					;VERB = PAINT
		BRA.S	CallRgn 					;SHARE COMMON CODE


;--------------------------------------------------------
;
;  PROCEDURE EraseRgn(* rgn: RgnHandle *);
;
EraseRgn
		MOVEQ	#ERASE,D0					;VERB = ERASE
		BRA.S	CallRgn 					;SHARE COMMON CODE


;--------------------------------------------------------
;
;  PROCEDURE InvertRgn(* rgn: RgnHandle *);
;
InvertRgn
		MOVEQ	#INVERT,D0					;VERB = INVERT
		BRA.S	CallRgn 					;SHARE COMMON CODE


;--------------------------------------------------------
;
;  PROCEDURE FillRgn(* rgn: RgnHandle; pat: Pattern *);
;
FillRgn	MOVEQ	#0,D0						;FLAG = FillRgn
		BRA.S	SHARE						; => USE COMMON CODE
		
		
;----------------------------------------------------------
;
;  PROCEDURE FillCRgn(rgn: RgnHandle; PPH: PixPatHandle);
;
FillCRgn MOVEQ	#1,D0						;FLAG = FillCRgn

SHARE	MOVE.L	(SP)+,A0					;POP RETURN ADDR
		MOVE.L	(SP)+,A1					;POP ADDR OF PATTERN
		MOVE.L	A0,-(SP)					;PUT RETURN ADDR BACK
		MOVE.L	A1,-(SP)					;PUSH ADDR OF PATTERN
		_SETFILLPAT							;FILLPAT := PAT
		MOVEQ	#FILL,D0					;VERB = FILL
;		BRA.S	CallRgn 					;SHARE COMMON CODE



;---------------------------------------------------------------
;
;  PROCEDURE CallRgn(rgn: RgnHandle);
;
;  code shared by FrameRgn, PaintRgn, EraseRgn, InvertRgn, and FillRgn.
;  enter with verb in D0.
;
CallRgn
		MOVE.L	(SP)+,A0					;POP RETURN ADDR
		MOVE.L	(SP)+,A1					;POP RGN
		MOVE.B	D0,-(SP)					;PUSH VERB
		MOVE.L	A1,-(SP)					;PUSH RGN
		MOVE.L	A0,-(SP)					;RESTORE RETURN ADDR
		MOVE.L	GRAFGLOBALS(A5),A0			;POINT TO LISAGRAF GLOBALS
		MOVE.L	THEPORT(A0),A0				;GET CURRENT GRAFPORT
		MOVE.L	GRAFPROCS(A0),D0			;IS GRAFPROCS NIL ?
		MOVE.L	JStdRgn,A0					;get piece of trap table
		BEQ.S	USESTD						;YES, USE STD PROC
		MOVE.L	D0,A0
		MOVE.L	RGNPROC(A0),A0				;NO, GET PROC PTR
USESTD	JMP 	(A0)						;GO TO IT


DrawRgn PROC  EXPORT
		IMPORT STRETCHBITS
		IMPORT PortToMap
;--------------------------------------------------------
;
;  PROCEDURE DrawRgn(rgn: RgnHandle; mode: INTEGER; pat: Pattern);
;
;  A6 OFFSETS OF PARAMS AFTER LINK:
;
PARAMSIZE	EQU 	10
RGN 		EQU 	PARAMSIZE+8-4			;LONG, RGNHANDLE
MODE		EQU 	RGN-2					;WORD
PAT 		EQU 	MODE-4					;LONG, ADDR OF PATTERN

BBOX		EQU		-8						;LOCAL COPY OF RGNBBOX
VARSIZE		EQU		BBOX					;SIZE OF LOCALS

		LINK	A6,#VARSIZE					;ALLOCATE STACK FRAME
		MOVE.L	RGN(A6),A0					;GET THE REGION HANDLE
		MOVE.L	(A0),A0						;POINT TO THE RGN
		MOVE.L	RGNBBOX(A0),BBOX(A6)		;COPY RGNBBOX.TOPLEFT
		MOVE.L	RGNBBOX+4(A0),BBOX+4(A6)	;COPY RGNBBOX.BOTRIGHT
		MOVE.L	GRAFGLOBALS(A5),A0			;POINT TO LISAGRAF GLOBALS
		MOVE.L	THEPORT(A0),A0				;GET CURRENT PORT
		TST 	PNVIS(A0)					;IS PNVIS NEG ?
		BMI.S	DONE						;YES, QUIT
		MOVE.L	A0,A1						;SAVE A COPY
		_PORTTOMAP							;GET BIT/PIXMAP IN A0
		MOVE.L	A0,-(SP)					;PUSH SRCBITS
		CLR.L	-(SP)						;NO MASKBITS
		MOVE.L	A0,-(SP)					;PUSH DSTBITS
		PEA		BBOX(A6)					;PUSH SRCRECT
		CLR.L	-(SP)						;NO MASKRECT
		PEA		BBOX(A6)					;PUSH DSTRECT
		MOVE	MODE(A6),D1					;PUSH MODE										; <SM4>
		OR		#$8,D1						;set the pattern bit in case the user forgot to	; <SM4>
		_GetStreamMode						;strip mode										; <SM4>
		MOVE.W	D1,-(SP)					;save stripped mode								; <SM4>
		MOVE.L	PAT(A6),-(SP)				;PUSH PAT
		MOVE.L	CLIPRGN(A1),-(SP)			;PUSH CLIPRGN
		MOVE.L	VISRGN(A1),-(SP)			;PUSH VISRGN
		MOVE.L	RGN(A6),-(SP)				;PUSH RGN
		CLR		-(SP)						;pass multicolor flag false
		_STRETCHBITS						;CALL STRETCHBITS
DONE	UNLINK	PARAMSIZE,'DRAWRGN '



FrRgn	PROC  EXPORT
		IMPORT FrmRect,NewRgn,CopyRgn,InsetRgn,DiffRgn,DrawRgn
;--------------------------------------------------------
;
;  PROCEDURE FrRgn(rgn: RgnHandle; mode: INTEGER; pat: Pattern);
;
;  A6 OFFSETS OF PARAMS AFTER LINK:
;
PARAMSIZE	EQU 	10
RGN 		EQU 	PARAMSIZE+8-4			;LONG, RGNHANDLE
MODE		EQU 	RGN-2					;WORD
PAT 		EQU 	MODE-4					;LONG, ADDR OF PATTERN

		LINK	A6,#0
		MOVEM.L D7/A3-A4,-(SP)				;SAVE REGS
		MOVE.L	GRAFGLOBALS(A5),A4			;POINT TO LISAGRAF GLOBALS
		MOVE.L	THEPORT(A4),A3				;GET CURRENT PORT
		TST 	PNVIS(A3)					;IS PNVIS NEG ?
		BMI.S	DONE						;YES, QUIT
;
;  special case rectangular region for speed.
;
		MOVE.L	RGN(A6),A0					;GET RGNHANDLE
		MOVE.L	(A0),A0 					;DE-REFERENCE IT
		CMP 	#10,RGNSIZE(A0) 			;IS IT RECTANGULAR ?
		BNE.S	NOTRECT 					;NO, CONTINUE
		PEA 	RGNBBOX(A0) 				;YES, PUSH ADDR OF BBOX
		bsr.l 	FRMRECT						;FRAME IT
		BRA.S	DONE						;AND QUIT

NOTRECT CLR.L	-(SP)						;MAKE ROOM FOR FCN RESULT
		_NEWRGN								;ALLOCATE TEMPRGN
		MOVE.L	(A7)+,D7					;PUT TEMPRGN IN D7
		MOVE.L	RGN(A6),-(SP)				;PUSH RGN
		MOVE.L	D7,-(SP)					;PUSH TEMPRGN
		_COPYRGN 							;COPY RGN INTO TEMPRGN
		MOVE.L	D7,-(SP)					;PUSH TEMPRGN
		MOVE.L	PNSIZE(A3),-(SP)			;PUSH PNSIZE
		_INSETRGN							;InsetRgn(tempRgn,pnSize);
		MOVE.L	RGN(A6),-(SP)				;PUSH RGN
		MOVE.L	D7,-(SP)					;PUSH TEMPRGN
		MOVE.L	D7,-(SP)					;PUSH TEMPRGN
		_DIFFRGN 							;DiffRgn(rgn,tempRgn,tempRgn);
		MOVE.L	D7,-(SP)					;PUSH TEMPRGN
		MOVE	MODE(A6),-(SP)				;PUSH MODE
		MOVE.L	PAT(A6),-(SP)				;PUSH PAT
		JSR 	DRAWRGN 					;DrawRgn(tempRgn,mode,pat);
		MOVE.L	D7,A0						;GET TEMPRGN
		_DisposHandle						;DISCARD IT
DONE	MOVEM.L (SP)+,D7/A3-A4				;RESTORE REGS
		UNLINK	PARAMSIZE,'FRRGN   '



NewRgn	FUNC  EXPORT
		IMPORT NewHandleWrapper
;---------------------------------------------------
;
;  FUNCTION NewRgn;
;  Allocate a new region and set it to the empty region.
;  Altered not to SysErr; if memerr then return nil.		<BAL/dvb/RAJ 03Mar89>
;
		moveq	#10,d0						;pass BYTECOUNT=10
		_NewHandle							;ALLOCATE A RELOCATABLE OBJECT
		MOVE.L	A0,4(SP)					;STORE INTO NEWRGN RESULT
		tst.w	d0
		bne.s	@retNil						;if couldn't get it, return nil
		MOVE.L	(A0),A0 					;DE-REFERENCE HANDLE
		MOVE	#10,(A0)+					;INSTALL RGNSIZE=10
		CLR.L	(A0)+						;INSTALL RGNBBOX=(0,0,0,0)
		CLR.L	(A0)+
@retNil	RTS 					;RETURN TO CALLER



DisposeRgn PROC  EXPORT 	
;---------------------------------------------------
;
;  PROCEDURE DisposeRgn(rgn: RgnHandle);
;
		MOVE.L	(SP)+,A1					;pop return addr
		MOVE.L	(SP)+,A0					;pop handle
		_DisposHandle						;discard it
		JMP 	(A1)						;and return



OpenRgn PROC  EXPORT
		IMPORT NewHandleWrapper,HidePen
;---------------------------------------------------
;
;  PROCEDURE OpenRgn;
;
		MOVEM.L D3/A2-A4,-(SP)				;SAVE REGS
		MOVE.L	GRAFGLOBALS(A5),A4			;POINT TO QUICKDRAW GLOBALS
		MOVE.L	THEPORT(A4),A0				;GET CURRENT GRAFPORT
		MOVE.L	#1,D0
		MOVE.L	D0,RGNSAVE(A0)				;RGNSAVE := TRUE
		CLR 	RGNINDEX(A4)				;RGNINDEX := 0
		CLR.L	-(SP)						;MAKE ROOM FOR FCN RESULT
		MOVE	#256,-(SP)					;PUSH BYTE COUNT = 256
		MOVE	(SP),RGNMAX(A4) 			;RGNMAX := 256 TOO;
		JSR 	NewHandleWrapper
		MOVE.L	(SP)+,RGNBUF(A4)			;RGNBUF := NEWHANDLE(RGNMAX)
		_HidePen
		MOVEM.L (SP)+,D3/A2-A4				;RESTORE REGS
		RTS 								;AND RETURN



CloseRgn PROC  EXPORT	
		IMPORT ShowPen,SortPoints,CullPoints,PackRgn
;---------------------------------------------------
;
;  PROCEDURE CloseRgn(* dstRgn: RgnHandle *);
;  Sort array of inversion points and pack into region.
;
;  A6 OFFSETS OF PARAMS AND LOCALS AFTER LINK:
;
PARAMSIZE	EQU 	4						;TOTAL BYTES OF PARAMETERS
DSTRGN		EQU 	PARAMSIZE+8-4			;LONG, RGNHANDLE
PTCOUNT 	EQU 	-2						;WORD
VARSIZE 	EQU 	PTCOUNT 				;SIZE OF LOCAL VARS


		LINK	A6,#VARSIZE
		MOVEM.L D3/A2-A4,-(SP)				;SAVE REGS
		MOVE.L	GRAFGLOBALS(A5),A4			;POINT TO QUICKDRAW GLOBALS
		MOVE.L	THEPORT(A4),A0				;GET CURRENT GRAFPORT
		TST.L	RGNSAVE(A0) 				;IS RGNSAVE TRUE ?
		BEQ.S	DONE						;NO, ABORT
		CLR.L	RGNSAVE(A0) 				;YES, RGNSAVE := FALSE
		_SHOWPEN 							;UNDO THE HIDEPEN FROM OPENRGN
		MOVE	RGNINDEX(A4),D0 			;GET CURRENT RGNINDEX
		
		cmp.w	#-147,qderr					;rgnTooBigErr?						<BAL 28Apr89>
		bne.s	@rgnOK						;no, return the region				<BAL 28Apr89>
		moveq	#0,d0						;yes, return an empty region		<BAL 28Apr89>
		move	d0,qdErr					;clear error so it doesn't bite us.	<BAL 28Apr89>
		
@rgnOK	LSR 	#2,D0						;DIV BY 4
		MOVE	D0,PTCOUNT(A6)				;FOR PTCOUNT
		MOVE.L	RGNBUF(A4),A3				;GET RGNBUF HANDLE
		MOVE.L	(A3),-(SP)					;PUSH BUF POINTER
		MOVE	D0,-(SP)					;PUSH PTCOUNT
		_SORTPOINTS							;QUICKSORT IN VH ORDER
		MOVE.L	(A3),-(SP)					;PUSH BUF POINTER
		PEA 	PTCOUNT(A6) 				;PUSH VAR PTCOUNT
		_CULLPOINTS							;CANCEL DUPLICATE PAIRS
		MOVE.L	A3,-(SP)					;PUSH RGNBUF HANDLE
		MOVE	PTCOUNT(A6),-(SP)			;PUSH (UPDATED) PTCOUNT
		MOVE.L	DSTRGN(A6),-(SP)			;PUSH DSTRGN
		_PACKRGN 							;PACK POINTS INTO DSTRGN
		MOVE.L	A3,A0						;GET RGNBUF HANDLE
		_DisposHandle						;DISCARD IT
DONE	MOVEM.L (SP)+,D3/A2-A4				;RESTORE REGS
		UNLINK	PARAMSIZE, 'CLOSERGN'



CopyRgn PROC  EXPORT
		IMPORT SetHSize
;---------------------------------------------------
;
;  PROCEDURE CopyRgn(* srcRgn,dstRgn: RgnHandle *);
;
PARAMSIZE	EQU 	8
SRCRGN		EQU 	PARAMSIZE+8-4			;RGNHANDLE
DSTRGN		EQU 	SRCRGN-4				;RGNHANDLE

		LINK	A6,#0						;ESTABLISH STACK FRAME
		MOVE.L	SRCRGN(A6),A0				;GET SRCRGN HANDLE
		MOVE.L	DSTRGN(A6),A1				;GET DSTRGN HANDLE
		CMP.L	A0,A1						;ARE THEY THE SAME?
		BEQ.S	DONE						;YES, QUIT

		MOVE.L	(A0),A0 					;DE-REFERENCE SRCRGN HANDLE
		MOVE.L	(A1),A1 					;DE-REFERENCE DSTRGN HANDLE
		MOVE	RGNSIZE(A0),D0				;GET SRC SIZE
		CMP 	RGNSIZE(A1),D0				;IS DST SIZE SAME AS SRC ?
		BEQ.S	COPY						;YES, CONTINUE

		MOVEM.L D0/D3/A2,-(SP)				;SAVE REGS AND BYTECOUNT
		MOVE.L	DSTRGN(A6),-(SP)			;PUSH DSTRGN HANDLE
		MOVE	D0,-(SP)					;PUSH NEWSIZE=SRC SIZE
		JSR 	SetHSize 					;CHANGE SIZE OF DST
		MOVEM.L (SP)+,D0/D3/A2				;RESTORE REGS AND BYTECOUNT
		MOVE.L	SRCRGN(A6),A0				;GET SRCRGN HANDLE
		MOVE.L	DSTRGN(A6),A1				;GET DSTRGN HANDLE
		MOVE.L	(A0),A0 					;DE-REFERENCE SRCRGN HANDLE
		MOVE.L	(A1),A1 					;DE-REFERENCE DSTRGN HANDLE

COPY	LSR 	#2,D0						;LONGCOUNT := BYTECOUNT DIV 4
		BCC.S	EVEN						;WAS THERE AN ODD WORD ?
		MOVE	(A0)+,(A1)+ 				;YES, DO IT TO MAKE EVEN
		BRA.S	EVEN						;AND CONTINUE
COPYLP	MOVE.L	(A0)+,(A1)+ 				;COPY A LONG OF SRC TO DST
EVEN	DBRA	D0,COPYLP					;LOOP FOR ALL LONGS

DONE	UNLINK	PARAMSIZE,'COPYRGN '



SetEmptyRgn PROC  EXPORT	
		IMPORT SetRectRgn
;---------------------------------------------------
;
;  PROCEDURE SetEmptyRgn(rgn: RgnHandle);
;
		MOVE.L	(SP)+,A0					;POP RETURN ADDR
		CLR.L	-(SP)						;PUSH LEFT, TOP
		CLR.L	-(SP)						;PUSH RIGHT,BOTTOM
		MOVE.L	A0,-(SP)					;RESTORE RETURN ADDR
		JMP 	SETRECTRGN					;DOUBLE UP ON CODE



SetRectRgn PROC  EXPORT 	
		IMPORT SetHSize
;---------------------------------------------------
;
;  PROCEDURE SetRectRgn(rgn: RgnHandle; left,top,right,bottom: INTEGER);
;  make a rectangular region from 4 integers.
;
		LINK	A6,#0						;ESTABLISH STACK FRAME
		MOVEM.L D3/A2,-(SP) 				;SAVE REGS
		MOVE.L	16(A6),A0					;GET RGN HANDLE
		MOVE.L	(A0),A1 					;DE-REFERENCE HANDLE
		MOVEQ	#10,D0
		CMP 	RGNSIZE(A1),D0				;IS RGNSIZE ALREADY 10 ?
		BEQ.S	SIZEOK						;YES, CONTINUE
		MOVE.L	A0,-(SP)					;PUSH RGNHANDLE
		MOVE	D0,-(SP)					;PUSH SIZE = 10 BYTES
		JSR 	SetHSize 					;CHANGE SIZE OF REGION
		MOVE.L	16(A6),A0					;GET RGN HANDLE
		MOVE.L	(A0),A1 					;DE-REFERENCE HANDLE
		MOVE	#10,RGNSIZE(A1) 			;INSTALL SIZE = 10
SIZEOK	MOVE.L	12(A6),RGNBBOX+TOPLEFT(A1)	;INSTALL RGNBBOX TOPLEFT
		MOVE.L	8(A6),RGNBBOX+BOTRIGHT(A1)	;INSTALL RGNBBOX BOTRIGHT
		MOVE	RGNBBOX+LEFT(A1),D0
		CMP 	RGNBBOX+RIGHT(A1),D0		;IS LEFT >= RIGHT ?
		BGE.S	EMPTY						;YES, SET TO EMPTY

		MOVE	RGNBBOX+TOP(A1),D0
		CMP 	RGNBBOX+BOTTOM(A1),D0		;IS TOP < BOTTOM ?
		BLT.S	DONE						;YES, CONTINUE

EMPTY	CLR.L	RGNBBOX+TOPLEFT(A1)
		CLR.L	RGNBBOX+BOTRIGHT(A1)
DONE	MOVEM.L (SP)+,D3/A2 				;RESTORE REGS
		UNLINK	12,'SETRECTR'



RectRgn PROC  EXPORT
		IMPORT SetRectRgn
;---------------------------------------------------
;
;  PROCEDURE RectRgn(rgn: RgnHandle; r: Rect);
;  make a rectangular region from a rectangle
;
		MOVE.L	(SP)+,A0					;POP RETURN ADDR
		MOVE.L	(SP)+,A1					;POP ADDR OF RECT
		MOVE.L	(A1)+,-(SP) 				;PUSH LEFT,TOP
		MOVE.L	(A1)+,-(SP) 				;PUSH RIGHT,BOTTOM
		MOVE.L	A0,-(SP)					;RESTORE RETURN ADDR
		JMP 	SETRECTRGN					;DOUBLE UP ON CODE



OffsetRgn PROC	EXPORT	
;---------------------------------------------------------
;
;  PROCEDURE OffsetRgn(rgn: RgnHandle; dh,dv: INTEGER);
;
		MOVE.L	(SP)+,A1					;POP RETURN ADDR
		MOVE	(SP)+,D1					;POP DV
		MOVE	(SP)+,D0					;POP DH
		MOVE.L	(SP)+,A0					;POP RGN HANDLE
		MOVE.L	(A0),A0 					;DE-REFERENCE IT
		ADD 	#2,A0						;POINT TO RGNBBOX

;------------------------------------------------------
;
;  OFFSET THE BOUNDING BOX
;
		ADD 	D1,(A0)+					;ADD DV TO TOP
		ADD 	D0,(A0)+					;ADD DH TO LEFT
		ADD 	D1,(A0)+					;ADD DV TO BOTTOM
		ADD 	D0,(A0)+					;ADD DH TO RIGHT


;---------------------------------------------------------------------
;
;  IF NON-RECTANGULAR REGION, OFFSET THE COORDINATES TOO.
;
		CMP 	#10,-10(A0) 				;IS REGION RECTANGULAR ?
		BEQ.S	DONE						;IF SO, WE'RE ALL DONE
NXTVERT ADD 	D1,(A0)+					;OFFSET VERTICAL COORD DV
NXTHOR	ADD 	D0,(A0)+					;OFFSET LEFT COORD DH
		ADD 	D0,(A0)+					;OFFSET RIGHT COORD DH
		CMP 	#32767,(A0) 				;HORIZ TERMINATOR ?
		BNE 	NXTHOR						;NO, LOOP
		ADD 	#2,A0						;YES, SKIP OVER TERMINATOR
		CMP 	#32767,(A0) 				;IS NEXT VERT = 32767 ?
		BNE 	NXTVERT 					;NO, LOOP FOR MORE
DONE	JMP 	(A1)						;RETURN



InsetRgn PROC  EXPORT	
		IMPORT InsetRect,SortPoints
		IMPORT NewHandleWrapper,RgnOp,PackRgn
;---------------------------------------------------------
;
;  PROCEDURE InsetRgn(rgn: RgnHandle; dh,dv: INTEGER);
;
;  Inset a region by (dh,dv). Outset if dh or dv neg
;
;  A6 OFFSETS OF PARAMS AFTER LINK:
;
PARAMSIZE	EQU 	8
RGN 		EQU 	PARAMSIZE+8-4			;LONG, RGNHANDLE
DH			EQU 	RGN-2					;WORD
DV			EQU 	DH-2					;WORD


		LINK	A6,#0						;NO LOCAL VARS
		MOVEM.L D3-D7/A2-A4,-(SP)			;SAVE REGS
		MOVE.L	DV(A6),D6					;GET DV AND DH BOTH
		BEQ.S	JGOHOME 					;QUIT IF BOTH ARE ZERO
		MOVE.L	RGN(A6),A4					;GET RGNHANDLE
		MOVE.L	(A4),A3 					;DE-REFERENCE IT
		MOVE	(A3)+,D7					;GET RGNSIZE


;--------------------------------------------------------------
;
;  IF RECTANGULAR REGION, CALL INSETRECT AND CHECK FOR EMPTY.
;
		CMP 	#10,D7						;IS RGN RECTANGULAR ?
		BNE.S	NOTRECT 					;NO, CONTINUE
		MOVE.L	A3,-(SP)					;PUSH ADDR OF RGNBBOX
		MOVE.L	D6,-(SP)					;PUSH DH AND DV
		_INSETRECT							;InsetRect(rgn^^.rgnbbox,dh,dv);
		MOVE	LEFT(A3),D0 				;GET BBOX LEFT
		CMP 	RIGHT(A3),D0				;IS LEFT >= RIGHT ?
		BGE.S	EMPTY						;YES, RETURN EMPTY RGN
		MOVE	TOP(A3),D0					;GET BBOX TOP
		CMP 	BOTTOM(A3),D0				;IS TOP >= BOTTOM ?
		BLT.S	JGOHOME 					;NO, CONTINUE
EMPTY	CLR.L	(A3)+						;SET RGNBBOX TO (0,0,0,0) TO
		CLR.L	(A3)+						;RETURN EMPTY REGION
JGOHOME BRA.S	GOHOME						;ALL DONE


;-----------------------------------------------------
;
;  THE REGION IS NOT RECTANGULAR. ALLOCATE A POINT BUFFER IN THE HEAP.
;
NOTRECT ADD 	D7,D7						;TRY BYTES NEEDED = RGNSIZE*2
		CLR.L	-(SP)						;ROOM FOR FCN RESULT
		MOVE	D7,-(SP)					;PUSH BYTESNEEDED
		JSR 	NewHandleWrapper			;ALLOCATE PTBUF
		MOVE.L	(SP)+,A3					;PUT PTBUF HANDLE IN A3
		BSR.S	HINSET						;INSET HORIZ AND FLIP
		SWAP	D6							;GET DV INSTEAD OF DH
		BSR.S	HINSET						;INSET VERTICAL AND FLIP BACK
		BRA.S	DONE						;ALL DONE


;--------------------------------------------------------------------------
;
;  LOCAL ROUTINE TO INSET HORIZONTALLY, SWAP H AND V COORDS, AND RE-SORT
;
;  RgnOp(rgn,rgn,bufHandle,maxBytes,op,dh,TRUE);
;
HINSET	CLR.W	-(SP)						;ROOM FOR FCN RESULT
		MOVE.L	A4,-(SP)					;PUSH RGNA = USER RGN
		MOVE.L	A4,-(SP)					;PUSG RGNB = USER RGN ALSO
		MOVE.L	A3,-(SP)					;PUSH BUFHANDLE
		MOVE	D7,-(SP)					;PUSH MAXBYTES
		MOVE	#8,-(SP)					;PUSH OP = INSET
		MOVE	D6,-(SP)					;PUSH DH
		ST		-(SP)						;PUSH OKGROW = TRUE
		_RGNOP
		MOVE.W	(SP)+,D5					;GET PTCOUNT IN D5
;
;  SWAP VERT AND HORIZ COORDS OF ALL INVERSION POINTS
;
		MOVE.L	(A3),A0 					;DE-REFERENCE PTBUF HANDLE
		MOVE	D5,D1						;COPY PTCOUNT
		BRA.S	SWAP2						;GO TO LOOP START
SWAPLP	MOVE.L	(A0),D0 					;GET A POINT
		SWAP	D0							;SWAP ITS COORDINATES
		MOVE.L	D0,(A0)+					;PUT IT BACK INTO ARRAY
SWAP2	DBRA	D1,SWAPLP					;LOOP FOR ALL POINTS
;
;  RE-SORT THE POINTS IN V.H ORDER
;
		MOVE.L	(A3),-(SP)					;PUSH PTBUF PTR
		MOVE	D5,-(SP)					;PUSH PTCOUNT
		_SORTPOINTS							;RE-SORT INTO VH ORDER
;
;  PACK THE RESULTING POINTS
;
		MOVE.L	A3,-(SP)					;PUSH PTBUF HANDLE
		MOVE	D5,-(SP)					;PUSH PTCOUNT
		MOVE.L	A4,-(SP)					;PUSH RGN HANDLE
		_PACKRGN 							;PackRgn(ptBuf,ptCount,rgn);
		RTS 								;RETURN TO LOCAL CALLER


;----------------------------------------------
;
;  DISCARD POINT BUFFER AND QUIT.
;
DONE	MOVE.L	A3,A0						;GET PTBUF HANDLE
		_DisposHandle						;DISCARD IT

GOHOME	MOVEM.L (SP)+,D3-D7/A2-A4			;RESTORE REGS
		UNLINK	PARAMSIZE,'INSETRGN'



EmptyRgn FUNC  EXPORT	
		IMPORT EmptyRect
;---------------------------------------------------
;
;  FUNCTION EmptyRgn(rgn: RgnHandle): BOOLEAN;
;
		MOVE.L	(SP)+,A0					;POP RETURN ADDR
		MOVE.L	(SP)+,A1					;POP RGNHANDLE
		MOVE.L	(A1),A1 					;DE-REFERENCE HANDLE
		PEA 	RGNBBOX(A1) 				;PUSH RGNBBOX
		MOVE.L	A0,-(SP)					;PUSH RETURN ADDR
		JMP 	([4*$ae+$e00])				;USE EMPTYRECT CODE



EqualRgn FUNC  EXPORT	
;-------------------------------------------------------
;
;  FUNCTION EqualRgn(rgnA,rgnB: RgnHandle): BOOLEAN;
;
;  RETURNS TRUE IF RGNA AND RGNB DESCRIBE THE SAME AREA
;
		MOVE.L	4(SP),A0				;GET RGNA HANDLE
		MOVE.L	8(SP),A1				;GET RGNB HANDLE
		CMP.L	A0,A1					;ARE THEY THE SAME ?
		BEQ.S	RETTRUE					;YES, THE REGIONS ARE THE SAME
		MOVE.L	(A0),A0 				;DE-REFERENCE RGN A
		MOVE.L	(A1),A1 				;DE-REFERENCE RGN B
		MOVE	(A0),D0 				;GET RGNSIZE A
		MOVE	D0,D1					;MAKE AN EXTRA COPY
		LSR 	#2,D1					;DIV BY 4 FOR LONG COUNT
		SUB 	#1,D1					;INIT DBRA LOOP COUNT
LOOP	CMPM.L	(A0)+,(A1)+ 			;COMPARE A LONG
		DBNE	D1,LOOP 				;LOOK TILL DIFFERENT OR COUNT
		BNE.S	RETFALSE				;DIFFERENT --> FALSE
		AND 	#3,D0					;GET 0..3 FINISH UP BYTES
		BEQ.S	RETTRUE					;IF NO MORE, WE MADE IT
LOOP2	CMPM.B	(A0)+,(A1)+ 			;COMPARE A BYTE
		BNE.S	RETFALSE				;BR IF DIFFERENT
		SUB 	#1,D0
		BNE.S	LOOP2					;LOOP LAST 1..3 BYTES
RETTRUE	MOVE.L	#1,D0					;TRUE
		BRA.S	DONE
RETFALSE MOVE.L	#0,D0					;FALSE
DONE	MOVE.B	D0,12(SP)				;SET RESULT
		MOVE.L	(SP)+,A0				;POP RETURN ADDR
		ADD 	#8,SP					;STRIP PARAMETERS
		JMP 	(A0)					;RETURN



SectRgn PROC  EXPORT
		EXPORT DoRgnOp,UnionRgn,DiffRgn,XorRgn
		IMPORT EqualRgn,CopyRgn,RSect,RectRgn,SetEmptyRgn
		IMPORT NewHandleWrapper,RgnOp,PackRgn
;---------------------------------------------------------
;
;  PROCEDURE SectRgn(srcRgnA,srcRgnB,dstRgn: RgnHandle);
;  calculate the intersection of two regions.
;
		MOVEQ	#0,D0						;OP = SECT
		BRA.S	DoRgnOp 					;SHARE COMMON CODE



;---------------------------------------------------------
;
;  PROCEDURE UnionRgn(srcRgnA,srcRgnB,dstRgn: RgnHandle);
;  calculate the union of two regions.
;
UnionRgn
		MOVEQ	#4,D0						;OP = UNION
		BRA.S	DoRgnOp 					;SHARE COMMON CODE



;---------------------------------------------------------
;
;  PROCEDURE DiffRgn(srcRgnA,srcRgnB,dstRgn: RgnHandle);
;  calculate the difference A-B of two regions
;
DiffRgn MOVEQ	#2,D0						;OP = DIFF
		BRA.S	DoRgnOp 					;SHARE COMMON CODE



;---------------------------------------------------------
;
;  PROCEDURE XorRgn(srcRgnA,srcRgnB,dstRgn: RgnHandle);
;  calculate the exclusive or of two regions
;
XorRgn	MOVEQ	#6,D0						;OP = DIFF
											;FALL INTO DORGNOP


;---------------------------------------------------------
;
;  PROCEDURE DoRgnOp(srcRgnA,srcRgnB,dstRgn: RgnHandle);
;
;  Computes the Intersection, Difference, Union, or Xor of two regions.
;
;  enter with op in D0.
;  op = 0: SECT
;		2: DIFF A-B
;		4: UNION
;		6: XOR
;
;
;  A6 OFFSETS OF PARAMS AND LOCALS AFTER LINK:
;
PARAMSIZE		EQU 	12
RGNA			EQU 	PARAMSIZE+8-4		;LONG, RGNHANDLE
RGNB			EQU 	RGNA-4				;LONG, RGNHANDLE
DSTRGN			EQU 	RGNB-4				;LONG, RGNHANDLE
;
TEMPRECTANGLE	EQU 	-8					;RECT
VARSIZE 		EQU 	TEMPRECTANGLE		;TOTAL LOCALS
;
DoRgnOp
		LINK	A6,#VARSIZE 				;ALLOCATE STACK FRAME
		MOVEM.L D3-D7/A2-A4,-(SP)			;SAVE REGS
		MOVE	D0,D5						;COPY OP INTO D5
		MOVE.L	RGNA(A6),A2 				;GET RGNA
		MOVE.L	RGNB(A6),A3 				;GET RGNB
		MOVE.L	DSTRGN(A6),A4				;GET DSTRGN
		MOVE.L	#2,D7
;
;  ARE THE TWO INPUT REGIONS THE SAME ?
;
		CLR.B	-(SP)						;MAKE ROOM FOR FCN RESULT
		MOVE.L	A2,-(SP)					;PUSH RGNA
		MOVE.L	A3,-(SP)					;PUSH RGNB
		_EQUALRGN							;CALL EQUALRGN
		TST.B	(SP)+						;ARE THEY THE SAME ?
		BEQ.S	NOTSAME 					;NO, CONTINUE
;
;  THE TWO REGIONS ARE THE SAME.  IF SECT OR UNION
;  THEN COPY RGNA INTO DSTRGN, ELSE ZERO OUT DSTRGN.
;
		AND 	D7,D5						;WAS OP SECT OR UNION ?
		BNE.S	ZERO						;NO, ZERO OUT DSTRGN
COPY	MOVE.L	A2,-(SP)					;PUSH RGNA
		MOVE.L	A4,-(SP)					;PUSH DSTRGN
		_COPYRGN 							;COPY RGNA INTO DSTRGN
		BRA.S	JDONE						;AND QUIT
ZERO	MOVE.L	A4,-(SP)					;PUSH DSTRGN
		_SetEmptyRgn 						;SET IT TO EMPTY
		BRA.S	JDONE						;AND QUIT

;
;  IF OP = DIFF AND RGNB = EMPTY,  COPY RGNA INTO DST
;
NOTSAME MOVE.L	(A2),A0 					;DE-REFERENCE RGNA
		MOVE.L	(A3),A1 					;DE-REFERENCE RGNB
		CMP 	D7,D5						;IS OP = DIFF ?
		BGT.S	UNIXOR						;NO, ITS UNION OR XOR
		BLT.S	BBOXES						;NO, IT'S SECT
		MOVE	RGNBBOX+LEFT(A1),D0 		;GET BBOX LEFT
		CMP 	RGNBBOX+RIGHT(A1),D0		;IS BBOX LEFT >= RIGHT ?
		BGE 	COPY						;YES, COPY RGNA INTO DST

;
;  IF op = SECT OR DIFF, THEN INTERSECT THE BOUNDING BOXES.
;
BBOXES	PEA 	RGNBBOX(A0) 				;PUSH RGNA^^.RGNBBOX
		PEA 	RGNBBOX(A1) 				;PUSH RGNB^^.RGNBBOX
		MOVE	D7,-(SP)					;PUSH NRECTS = 2
		PEA 	TEMPRECTANGLE(A6)			;PUSH DST = TEMPRECTANGLE
		_RSECT								;CALC INTERSECTION
		BNE.S	NOTEMPTY					;BR IF RESULT NOT EMPTY
;
;  THE BOUNDING BOXES DON'T INTERSECT.
;  IF OP = SECT, THEN RETURN EMPTY.
;  IF OP = DIFF, THEN COPY RGNA INTO DSTRGN.
;
		TST 	D5							;IS OP = SECT ?
		BEQ 	ZERO						;YES, RETURN EMPTY
		BRA 	COPY						;NO, COPY SRCA INTO DSTRGN

;
;  IF OP = SECT, THEN CHECK FOR BOTH INPUTS RECTANGULAR
;
NOTEMPTY MOVE.L (A2),A0 					;DE-REFERENCE RGNA
		MOVE.L	(A3),A1 					;DE-REFERENCE RGNB
		TST 	D5							;IS OP = SECT ?
		BNE.S	NOTEASY 					;NO, CONTINUE
		MOVEQ	#10,D0
		CMP 	RGNSIZE(A0),D0				;IS RGNA RECTANGULAR ?
		BNE.S	NOTEASY 					;NO, CONTINUE
		CMP 	RGNSIZE(A1),D0				;IS RGNB RECTANGULAR ?
		BNE.S	NOTEASY 					;NO, CONTINUE
		MOVE.L	A4,-(SP)					;PUSH DSTRGN
		PEA 	TEMPRECTANGLE(A6)			;PUSH TEMPRECTANGLE
		_RECTRGN 							;RectRgn(dstRgn,tempRect);
JDONE	BRA.S	DONE

;
;  OP = UNION OR XOR:  IF EITHER REGION IS EMPTY, COPY THE OTHER.
;
UNIXOR	MOVE	RGNBBOX+LEFT(A1),D0 		;GET RGNB BBOX LEFT
		CMP 	RGNBBOX+RIGHT(A1),D0		;IS RGNB BBOX LEFT >= RIGHT ?
		BGE 	COPY						;YES, COPY RGNA INTO DST

		MOVE	RGNBBOX+LEFT(A0),D0 		;GET RGNA BBOX LEFT
		CMP 	RGNBBOX+RIGHT(A0),D0		;IS RGNA BBOX LEFT >= RIGHT ?
		BLT.S	NOTEASY 					;NO, CONTINUE
		MOVE.L	A3,A2						;YES, GET RGNB INSTEAD
		BRA 	COPY						;COPY RGNB INTO DST


NOTEASY MOVE	RGNSIZE(A0),D4				;GET RGNA RGNSIZE
		ADD 	RGNSIZE(A1),D4				;ADD RGNB RGNSIZE
		ADD 	D4,D4						;TRY DOUBLE FOR BYTECOUNT
		CLR.L	-(SP)						;MAKE ROOM FOR FCN RESULT
		MOVE	D4,-(SP)					;PUSH BYTECOUNT
		JSR 	NewHandleWrapper			;ALLOCATE PTBUF
		MOVE.L	(SP)+,A3					;GET PTBUF HANDLE IN A3
;
;  PtCount := RgnOp(srcA,srcB,bufHandle,maxBytes,op,0,TRUE);
;
		CLR.W	-(SP)						;MAKE ROOM FOR FCN RESULT
		MOVE.L	RGNA(A6),-(SP)				;PUSH RGNA
		MOVE.L	RGNB(A6),-(SP)				;PUSH RGNB
		MOVE.L	A3,-(SP)					;PUSH BUFHANDLE
		MOVE	D4,-(SP)					;PUSH MAXBYTES
		MOVE	D5,-(SP)					;PUSH OP
		CLR.W	-(SP)						;PUSH DH=0
		ST		-(SP)						;PUSH OKGROW = TRUE
		_RGNOP
		MOVE	(SP)+,D6					;GET PTCOUNT

		MOVE.L	A3,-(SP)					;PUSH PTBUF HANDLE
		MOVE	D6,-(SP)					;PUSH PTCOUNT
		MOVE.L	A4,-(SP)					;PUSH DSTRGN
		_PACKRGN 							;PackRgn(ptBuf,ptCount,dstRgn);

		MOVE.L	A3,A0						;GET PTBUF HANDLE
		_DisposHandle						;DISCARD IT

DONE	MOVEM.L (SP)+,D3-D7/A2-A4			;RESTORE REGS
		UNLINK	PARAMSIZE,'DORGNOP '



PtInRgn FUNC  EXPORT
;------------------------------------------------------------
;
;  FUNCTION PtInRgn(pt: Point; rgn: RgnHandle): BOOLEAN;
;
;  TESTS IF A GIVEN POINT IS INSIDE A REGION.
;
;  A6 OFFSETS OF PARAMETERS AFTER LINK:
;
PARAMSIZE	EQU 	8						;SIZE OF PARAMETERS
RESULT		EQU 	PARAMSIZE+8 			;BOOLEAN
PT			EQU 	RESULT-4				;POINT, VALUE
RGN 		EQU 	PT-4					;LONG, HANDLE


ENTRY	LINK	A6,#0						;NO LOCAL VARS
		MOVE.L	D3,-(SP)					;SAVE REG
		MOVE	PT+H(A6),D1 				;GET TEST HORIZ
		MOVE	PT+V(A6),D2 				;GET TEST VERT
		CLR 	D3							;INIT INSIDE:=FALSE


;-----------------------------------------------------------
;
;  FIRST CHECK BOUNDING BOX
;
		MOVE.L	RGN(A6),A0					;GET RGN HANDLE
		MOVE.L	(A0),A0 					;DE-REFERENCE IT
		CMP 	RGNBBOX+LEFT(A0),D1 		;IS PT.H < BBOX LEFT ?
		BLT.S	DONE						;YES, RETURN FALSE
		CMP 	RGNBBOX+RIGHT(A0),D1		;IS PT.H >= BBOX RIGHT ?
		BGE.S	DONE						;YES, RETURN FALSE
		CMP 	RGNBBOX+TOP(A0),D2			;IS PT.V < BBOX TOP ?
		BLT.S	DONE						;YES, RETURN FALSE
		CMP 	RGNBBOX+BOTTOM(A0),D2		;IS PT.V >= BBOX BOT ?
		BGE.S	DONE						;YES, RETURN FALSE
		CMP 	#10,RGNSIZE(A0) 			;IS REGION RECTANGULAR ?
		BNE.S	NOTRECT 					;NO, CONTINUE
		NOT 	D3							;YES, RETURN TRUE
		BRA.S	DONE


;------------------------------------------------------------------
;
;  PT IS INSIDE BOUNDING BOX AND REGION IS NOT RECTANGULAR.
;  LOOK AT THE INVERSION POINTS TO DETERMINE IF PT IN REGION.
;
NOTRECT LEA 	RGNDATA(A0),A0				;POINT TO FIRST VERT COORD
NXTVERT CMP 	(A0)+,D2					;IS NEXT VERT > PT.V ?
		BLT.S	DONE						;YES, QUIT
NEXTHOR MOVE	(A0)+,D0					;GET HORIZ COORD
		CMP 	#32767,D0					;IS IT THE TERMINATOR ?
		BEQ 	NXTVERT 					;YES, GET NEXT VERT COORD
		CMP 	D1,D0						;IS HORIZ <= PT.H ?
		BGT 	NEXTHOR 					;NO, IGNORE THIS POINT
		NOT 	D3							;YES, TOGGLE INSIDE
		BRA 	NEXTHOR 					;AND GO FOR MORE POINTS
DONE	NEG.B	D3							;BOOLEAN RESULT IS 0 OR 1
		MOVE.B	D3,RESULT(A6)				;RETURN BOOLEAN FCN RESULT
		MOVE.L	(SP)+,D3					;RESTORE REG
		UNLINK	PARAMSIZE,'PTINRGN '




RectInRgn FUNC	EXPORT	
;--------------------------------------------------
;
;  FUNCTION RectInRgn(r: Rect; rgn: RgnHandle): BOOLEAN;
;
;  Returns TRUE if any part of the rectangle intersects the region.
;
;
;  A6 OFFSETS OF PARAMETERS AFTER LINK:
;
PARAMSIZE	EQU 	8						;TOTAL SIZE OF PARAMETERS
RESULT		EQU 	PARAMSIZE+8 			;BYTE, BOOLEAN
RECT		EQU 	RESULT-4				;LONG, VAR ADDR
RGN 		EQU 	RECT-4					;LONG, RGNHANDLE


;------------------------------------------------------
;
;  A6 OFFSETS OF LOCAL VARIABLES AFTER LINK:
;
MINRECT 	EQU 	-8						;RECTANGLE
SAVESTACK	EQU 	MINRECT-4				;LONG
STATE		EQU 	SAVESTACK-RGNREC		;REGION STATE RECORD
VARSIZE 	EQU 	STATE					;TOTAL SIZE OF VARIABLES


		LINK	A6,#VARSIZE 				;ALLOCATE LOCAL VARIABLES
		MOVEM.L D0-D7/A1-A5,-(SP)			;SAVE REGISTERS
		MOVE.L	SP,SAVESTACK(A6)			;REMEMBER STACK START
		CLR.B	RESULT(A6)					;INIT BOOLEAN RESULT TO FALSE
		MOVE.L	RGN(A6),A1					;GET REGION HANDLE
		MOVE.L	(A1),A1 					;DE-REFERENCE IT


;--------------------------------------------------------------
;
;  FIRST CHECK IF RECTANGLE INTERSECTS BOUNDING BOX OF REGION
;
		MOVE.L	RECT(A6),-(SP)				;PUSH POINTER TO RECT
		PEA 	RGNBBOX(A1) 				;PUSH POINTER TO RGN BBOX
		MOVE	#2,-(SP)					;PUSH NRECTS=2
		PEA 	MINRECT(A6) 				;PUSH ADDR WHERE TO PUT RESULT
		_RSECT								;CALC INTERSECTION
		BEQ.S	GOHOME						;QUIT IF NO INTERSECTION
		CMP 	#10,RGNSIZE(A1) 			;IS REGION RECTANGULAR ?
		BEQ.S	RETTRUE						;YES, RETURN TRUE


;------------------------------------------------------------
;
;  THE REGION IS NON-RECTANGULAR AND THE RECTANGLE INTERSECTS
;  THE REGION'S BOUNDING BOX. WE WILL PLAY BACK THE PORTION OF
;  THE REGION WITHIN MINRECT AND SEE IF ANY PART OF THE REGION
;  IS ACTUALLY INSIDE THE RECTANGLE.
;


;-------------------------------------------------
;
;  INITIALIZE RGN STATE RECORD AT TOP.
;
		MOVE.L	A1,A0						;GET RGNPTR IN A0
		LEA 	STATE(A6),A1				;GET STATE RECORD IN A1
		MOVE	MINRECT+LEFT(A6),D0 		;MINH IN D0
		MOVE	MINRECT+RIGHT(A6),D1		;MAXH IN D1
		MOVE	D0,D2						;BUFLEFT:=MINH
		_INITRGN 							;INIT RECORD, ALLOCATE BUFFER


;------------------------------------------------------------
;
;  PLAY THE REGION BACK INTO SCAN BUFFER UNTIL IT GETS DOWN TO
;  MINRECT, THEN CHECK EACH SCANLINE FOR NON-ZERO PLAYBACK.
;  QUIT AND RETURN TRUE IF NON-ZERO FOUND BEFORE RGN GOES BEYOND MINRECT.
;
		MOVE	SCANSIZE(A1),D5 			;GET BUFSIZE= # LONGS -1
		MOVE	MINRECT+TOP(A6),D0
		_SEEKRGN 							;SEEK THE REGION TO MINRECT TOP
		MOVE	MINRECT+BOTTOM(A6),D6
TESTBUF MOVE.L	SCANBUF(A1),A0				;POINT TO BUFFER START
		MOVE	D5,D0						;INIT LOOP COUNT TO BUFSIZE
NXTLONG TST.L	(A0)+						;IS SCAN BUF NON-ZERO ?
		DBNE	D0,NXTLONG					;TEST LONGS TILL NON ZERO OR END
		BNE.S	RETTRUE						;WE FOUND A NON-ZERO, RETURN TRUE
		MOVE	NEXTV(A1),D0				;GET NEXT VERTICAL IN RGN
		CMP 	D0,D6						;IS NEXT RGN VERT BEYOND BOTTOM ?
		BLE.S	GOHOME						;YES, RETURN FALSE
		_SEEKRGN 							;NO, SEEK TO NEXT VERT CHANGE
		BRA.S	TESTBUF 					;AND SEE IF IT IS NON-ZERO

RETTRUE	ADDQ.B	#1,RESULT(A6)				;SET BOOLEAN RESULT TO TRUE
GOHOME	MOVE.L	SAVESTACK(A6),SP			;STRIP SCAN BUFFER IF ANY
		MOVEM.L (SP)+,D0-D7/A1-A5			;RESTORE REGISTERS
		UNLINK	PARAMSIZE,'RECTINRG'


	IF 0 THEN

OldTrimRect FUNC  EXPORT

		IMPORT RgnOp,TrimRgn
;------------------------------------------------------
;
;  FUNCTION TrimRect(rgn: RgnHandle; VAR dstRect: Rect): CCR TRISTATE;
;
;  RESULT IN CONDITION CODES:
;
;  =  RESULT RECTANGULAR, DSTRECT TRIMMED
;  <  RESULT EMPTY, DSTRECT NOT MODIFIED
;  >  RESULT NON-RECT, DSTRECT NOT MODIFIED
;
;  If the intersection of rgn and dstRect is rectangular,
;  then return EQUAL and put the intersection into dstRect.
;  If the intersection is empty or not rectangular, then
;  return FALSE and don't modify dstRect.
;
;	Does not call the storage allocator.
;
;	1.	Fake up a rect rgn on the stack from dstRect
;	2.	Call RgnOp with max bytes = 24, OKGROW = FALSE
;	3a. If ptCount = 4 THEN result rect, return TRUE and update dstRect.
;	3b. If ptCount < 4 THEN result empty, return TRUE and clear dstRect.
;	3c. If ptCount > 4 THEN result not rect, return FALSE
;
PARAMSIZE		EQU 	8
RGN 			EQU 	PARAMSIZE+8-4		;LONG, RGNHANDLE
DSTRECT 		EQU 	RGN-4				;LONG, ADDR OF DSTRECT

PTDATA			EQU 	-24 				;ROOM FOR 6 POINTS
PTMASTER		EQU 	PTDATA-4			;LONG, FAKE MASTER
REGION			EQU 	PTMASTER-10 		;ROOM FOR RECT RGN DATA
RGNMASTER		EQU 	REGION-4			;LONG
VARSIZE 		EQU 	RGNMASTER

		bra		TrimRgn
		
		LINK	A6,#VARSIZE 				;ALLOCATE STACK FRAME
		MOVEM.L D0-D2/A1,-(SP)				;SAVE ALL REGS USED
		LEA 	PTDATA(A6),A0				;POINT TO BUFFER
		MOVE.L	A0,PTMASTER(A6) 			;INSTALL INTO FAKE MASTER
		LEA 	REGION(A6),A1				;POINT TO REGION DATA
		MOVE.L	A1,RGNMASTER(A6)			;INSTALL INTO FAKE MASTER
		MOVE	#10,(A1)+					;INSTALL RGNSIZE = 10
		MOVE.L	DSTRECT(A6),A0				;POINT TO DSTRECT
		MOVE.L	(A0)+,(A1)+ 				;COPY DSTRECT TOPLEFT
		MOVE.L	(A0)+,(A1)+ 				;COPY DSTRECT BOTRIGHT
;
;  RgnOp(rgn,rectRgn,BufHandle,24,sect,0,FALSE)
;
		CLR.W	-(SP)						;ROOM FOR FCN RESULT
		MOVE.L	RGN(A6),-(SP)				;PUSH RGN
		PEA 	RGNMASTER(A6)				;PUSH FAKE RGNHANDLE
		PEA 	PTMASTER(A6)				;PUSH BUFHANDLE
		MOVE	#24,-(SP)					;PUSH MAXBYTES = 24
		CLR.L	-(SP)						;PUSH OP = SECT, DH = 0
		CLR.B	-(SP)						;PUSH OKGROW = FALSE
		_RGNOP								;RgnOp(rgn,rectRgn,buf,64,op,dh,FALSE);
		MOVE.L	DSTRECT(A6),A0				;POINT TO DSTRECT
		CMP 	#4,(SP)+					;IS PT COUNT = 4 ?
		BNE.S	DONE						;NO, RETURN < OR > IN CCR
		MOVE.L	PTDATA(A6),(A0)+			;UPDATE DSTRECT.TOPLEFT
		MOVE.L	PTDATA+12(A6),(A0)+ 		;UPDATE DSTRECT.BOTRIGHT
		SUB 	D0,D0						;SET EQUAL FLAG
DONE	MOVEM.L (SP)+,D0-D2/A1				;RESTORE ALL REGS
		UNLK	A6							;RELEASE STACK FRAME
		RTD		#PARAMSIZE					;STRIP PARAMETERS AND RETURN

	ENDIF
	

		
TrimRect FUNC  EXPORT
;------------------------------------------------------
;
;  FUNCTION TrimRgn(rgn: RgnHandle; VAR dstRect: Rect; Trim: integer): CCR TRISTATE;
;
;		Quickly determine the complexity of the interection of a 
;  		rectangle and a region.  If the intersection is rectangular,
;		return the intersection in dstRect.
;
;		If Trim is false, dstRect will not be altered: 
;		NON-RECT will be returned if intersection ≠ dstRect
;
;  RESULT IN CONDITION CODES:
;
;  =  RESULT RECTANGULAR
;  <  RESULT EMPTY
;  >  RESULT NON-RECT
;
;  CLOBBERS: A0
;
;	Does not call the storage allocator.
;
;	1.	Allocate 2 inversion pair buffers on stack
;	2.	Play rgn (trimmed to rect.left, right) into buffers until rect.top reached
;			if more than 2 points in buffer -> NON-RECT result
;	3.  Play rgn until rect.bottom, 
;			if pair in buffer changes -> NON-RECT result
;			else if buffer empty then -> EMPTY/FULL result
;			else Trimmed RECT result
;
;	ASSUMES:	RgnBBox completely encloses Rect
;
;	NOTE:  		Only the sides of the dstRect are actually trimmed,
;				no top/bottom trimming is performed
;
;
PARAMSIZE		EQU 	10
RGN 			EQU 	PARAMSIZE+8-4		;LONG, RGNHANDLE
DSTRECT 		EQU 	RGN-4				;LONG, ADDR OF DSTRECT
TRIM	 		EQU 	DSTRECT-2			;WORD, SHOULD DST BE TRIMMED?

VARSIZE 		EQU 	0

		LINK	A6,#VARSIZE 				;ALLOCATE STACK FRAME
		MOVEM.L D0-D7/A1-A5,-(SP)			;SAVE ALL REGS USED
		MOVE.L	DSTRECT(A6),A0				;POINT TO DSTRECT
		MOVEM.L	(A0),D4/D5					;D4 = MinRect.Top, Left
											;D5 = MinRect.Bottom, Right
		MOVE.L	D4,D6
		SWAP	D6							;D6 = MinRect.Top
		MOVE.L	RGN(A6),A3					;get RgnHandle
		MOVE.L	(A3),A3
		MOVE.W	RGNSIZE(A3),D2				;get rgnSize in D2
		CMP		#10,D2						;Rect Rgn?
		BEQ		DONE1						;return with RECT intersect true
		ADD		#RGNDATA,A3					;point at rgnData
		
		_StackAvail 						;get stack avail in D0.L
		SUB.L	#qdStackXtra,D0				;subtract slop factor				<1.5> BAL
		EXT.L	D2							;make it long
		CMP.L	D2,D0						;enough space?
		BGE.S	STKOK						;yes, go allocate

		MOVE.W	D5,D2
		SUB.W	D4,D2						;get Right - Left
		EXT.L	D2							;make it long
		LSL.L	#2,D2						;2 max buffers = 2 (width * 2)
		CMP.L	D0,D2						;enough space?
		BLE.S	STKOK						;yes, go allocate
		
	;	_debugger							;I wish I had a better solution here...
		BRA		DONE1						;return with cc = GT => NON-RECT

STKOK	LSR.L	#1,D2						;
		BCLR	#0,D2						;make bufSize even
		MOVE.L	SP,A0						;Save stack base in A0
		SUB.L 	D2,SP						;allocate one buffer
		MOVE.L	SP,A4						;remember buffer pointer
		SUB.L 	D2,SP						;allocate one buffer
		MOVE.L	SP,A5						;remember buffer pointer

;-------------------------------------------------------------
;
;	Seek into region until ThisV >= minRect.Top
;;

		MOVEQ	#0,D2						;init parity to out=even
		MOVE.W	#32767,D7					;get a MAXINT for comparisons
		MOVE.L	A4,A1						;set up src1 ptr
		bra.s	NXTV
		
EQUAL	CMP 	D7,D0						;ALL DONE ?
		BNE.S	XorScam						;no, go back for more

NXTV	MOVE.W	D7,(A1)						;flag end of buffer
		
		CMP.W	(A3)+,D6					;is minRect.Top < thisV?
		BLT.S	INRECT						;yes, go check result
		
		MOVE.L	A4,A2						;set up src1 ptr
		MOVE.L	A5,A1						;set up dest ptr
		EXG		A4,A5						;swap the point buffers


;-------------------------------------------------------------
;
;   Each input scan is a sorted array of integers terminated by 32767.
;
;	Combine region inversion point data (A3) with that in current
;	buffer (A2) and place result in (A1).  Discard inversion points not
;	between Left = D4 and Right = D5.  Eliminate duplicate points.
;	Maintain count of inversion points to the left of D4 in D2.
;
;	NOTE: 	This routine is similar to XorScan except that
;			it trims the inversion pairs to minRect.Left, Right
;

XorScam MOVE	(A2)+,D1					;get next B
NEXTA	MOVE	(A3)+,D0					;get next A
NEXT	CMP 	D1,D0						;find the leftmost
		BEQ.S	EQUAL						;equal points cancel
		BLT.S	ALESS						;A is less
BLESS	MOVE	D1,(A1)+					;B is pre-clipped so put to dst
		MOVE	(A2)+,D1					;get next B
		BRA.S	NEXT						;loop for more
ALESS	CMP.W	D4,D0						;is A less than or equal to minRect.Left?
		BLE.S	FLIP						;yes, flip parity
		CMP.W	D0,D5						;is A greater than or equal to minRect.Right?
		BLE.S	NEXTA						;yes, discard
		MOVE	D0,(A1)+					;PUT A TO DST
		;move.l	a0,d0
		;move.l	a1,d3
		;chk.l	d0,d3						;have we gone to far?
		BRA.S	NEXTA						;loop for more
FLIP	ADDQ	#1,D2						;toggle even/odd state
		BRA.S	NEXTA						;loop for more

;-------------------------------------------------------------
;
;	Scan through region pointed to by A3 until 
;		1) Find an odd number of points to the left of D4  -or-
;		2) Find a point between D4 and D5  -or-
;		3) Find a MAXINT (D7)
;

Scam	MOVE	(A3)+,D0					;get next A
		CMP.W	D4,D0						;is A less than or equal to minRect.Left?
		BLE.S	FLIP2						;yes, flip parity
		CMP.W	D0,D7						;is A MAXINT?
		BEQ.S	NXTV2						;go get next vert
		CMP.W	D0,D5						;is A greater than or equal to minRect.Right?
		BLE.S	Scam						;yes, discard
		BRA.S	BAIL						;this would alter the result so bail
FLIP2	MOVE	(A3)+,D0					;get another A
		CMP.W	D4,D0						;is it also less than or equal to minRect.Left?
		BLE.S	Scam						;yes, parity preserved

BAIL	CMP.W	#0,D7						;NON-RECT, set CC GT and return
		BRA.S	DONE


;-------------------------------------------------------------
;
;	If the initial scanline of intersection is rectangular then
;	'Scam' through the region until ThisV >= minRect.Bottom.
;	Else abort and return a NON-RECT result
;;

INRECT
		SUB.L	A4,A1						;Get pnt count * 2
		MOVE	A1,D3						;make a copy
		CMP		#4,D3						;is pnt count > 2?
		BGT.S	DONE						;NON-RECT so bail out
		BLT.S	RECT						;less than 2 pnts => rectangular so far
		AND		#1,D2						;2 pnts => must check parity, is parity even?
		BNE.S	BAIL						;no, return NON-RECT

RECT	MOVE.L	D5,D6
		SWAP	D6							;D6 = MinRect.Bottom
		SUB		#2,A3						;back up to thisV
NXTV2	CMP.W	(A3)+,D6					;is thisV < minRect.Bottom?
		BGT.S	SCAM						;yes, go scan more of region
		
		TST		TRIM(A6)					;is trimming allowed?
		BNE.S	TRIMOK						;yes, go to it
		TST		D3							;no, there must be zero points
		BEQ.S	NOTRIM						;check for empty/full result
		BRA.S	BAIL						;return failure

;-------------------------------------------------------------
;
;	The entire intersection is complete and the result is still
;	rectangular.  First check for the trivial FULL/EMPTY intersections then
;	process any partial rectangular intersections.
;
		
TRIMOK	MOVE.L	DSTRECT(A6),A1				;point to dstRect
		MOVE	D2,D0						;prepare for DONE2 fall thru
		CMP		#2,D3						;How many words in scan buffer?
		BLT.S	NOTRIM						;none, go decide between full/empty
		BGT.S	TRIM2						;two, must trim both left and right
											;one, could be left or right
		BTST	#0,D0						;check parity
		BNE.S	TRIMR						;odd, must trim right
		
		MOVE	(A4),Left(A1)				;even, trim left and return RECT
		BRA.S	DONE2
		
TRIM2	MOVE	(A4)+,Left(A1)				;trim Left and then Right
TRIMR	MOVE	(A4),Right(A1)				;trim right and return RECT
		BRA.S	DONE2
		
NOTRIM	MOVEQ	#1,D0
		AND		D0,D2						;make even/odd count 0/1
DONE2	CMP		D0,D2						;set cc LT if even, EQ if odd
DONE	MOVE.L	A0,SP						;strip buffers, restore stack ptr
DONE1	MOVEM.L (SP)+,D0-D7/A1-A5			;RESTORE ALL REGS
		UNLK	A6							;RELEASE STACK FRAME
		RTD 	#PARAMSIZE					;STRIP PARAMETERS AND RETURN


 



MapRgn	PROC  EXPORT
		IMPORT MapRect,NewHandleWrapper,PutRgn,MapPt
		IMPORT SortPoints,CullPoints,PackRgn
;-------------------------------------------------------------
;
;  PROCEDURE MapRgn(rgn: RgnHandle; fromRect,toRect: Rect);
;
;  A6 OFFSETS OF PARAMETERS AND LOCALS AFTER LINK:
;
; fix from QDciPatchROM.a is in as <7Sept90 KON>							<sm 6/9/92>stb

PARAMSIZE		EQU 	12
RGN 			EQU 	PARAMSIZE+8-4		;LONG, RGNHANDLE
FROMRECT		EQU 	RGN-4				;LONG, ADDR OF RECT
TORECT			EQU 	FROMRECT-4			;LONG, ADDR OF RECT

INDEX			EQU 	-2					;INTEGER
SIZE			EQU 	INDEX-2 			;WORD
PTCOUNT 		EQU 	SIZE-2				;WORD
VARSIZE 		EQU 	PTCOUNT 			;TOTAL BYTES


		LINK	A6,#VARSIZE 				;ALLOCATE STACK FRAME
		MOVEM.L D3/D6-D7/A2-A4,-(SP)		;SAVE REGS
;
; QUIT FAST IF FROMRECT = TORECT
;
		MOVE.L	FROMRECT(A6),A0 			;POINT TO FROMRECT
		MOVE.L	TORECT(A6),A1				;POINT TO TORECT
		CMPM.L	(A0)+,(A1)+ 				;IS TOPLEFT SAME ?
		BNE.S	NOTSAME 					;NO, CONTINUE
		CMPM.L	(A0)+,(A1)+ 				;YES, IS BOTRIGHT SAME TOO ?
		BEQ.S	JDONE						;IF SO, JUST QUIT
;
;  SPECIAL CASE RECTANGULAR RGN												<7Sept90 KON>
;
NOTSAME MOVE.L	RGN(A6),A4					;GET RGNHANDLE					<7Sept90 KON>
		MOVE.L	(A4),A0 					;DE-REFERENCE RGN				<7Sept90 KON>
		CMP 	#10,RGNSIZE(A0) 			;IS RGN RECTANGULAR ?			<7Sept90 KON>
		BNE.S	NOTRECT 					;NO, CONTINUE					<7Sept90 KON>
;
; Don't do anything if region is rectangular and wide open since MapRect will choke	<7Sept90 KON>
; a0 points to rgn
;
		cmp.l	#$80018001,2(a0)			;								<7Sept90 KON>
		bne.s	@notWide					;								<7Sept90 KON>
		cmp.l	#$7fff7fff,6(a0)			;wide open?;					<7Sept90 KON>
		beq.s	JDone						;Yes, Don't remap				<7Sept90 KON>
@notWide
		PEA 	RGNBBOX(A0) 				;YES, PUSH RGNBBOX
		MOVE.L	FROMRECT(A6),-(SP)			;PUSH FROMRECT
		MOVE.L	TORECT(A6),-(SP)			;PUSH TO RECT
		_MAPRECT 							;MapRect(rgn^^.rgnBBox,from,to);
JDONE	BRA.S	DONE

NOTRECT CLR.L	-(SP)						;ROOM FOR FCN RESULT
		MOVE	#256,-(SP)					;PUSH BYTECOUNT = 256
		MOVE	(SP),SIZE(A6)				;SIZE := 256 BYTES
		JSR 	NewHandleWrapper			;ALLOCATE PTBUF
		MOVE.L	(SP)+,A3					;GET PTBUF HANDLE IN A3

		CLR 	INDEX(A6)					;INDEX := 0
		MOVE.L	A4,-(SP)					;PUSH RGN
		MOVE.L	A3,-(SP)					;PUSH PTBUF HANDLE
		PEA 	INDEX(A6)					;PUSH VAR INDEX
		PEA 	SIZE(A6)					;PUSH VAR SIZE
		_PUTRGN								;UNPACK RGN INTO INVERSION PTS
		MOVE	INDEX(A6),D7				;GET INDEX
		LSR 	#2,D7						;PTCOUNT := INDEX DIV 4
;
;  MAP ALL INVERSION POINTS
;
		MOVE	D7,D6						;COPY PTCOUNT FOR LOOP COUNT
		MOVE.L	(A3),A2 					;DE-REFERENCE PTBUF HANDLE
		BRA.S	MORE						;GO TO LOOP START
LOOP	MOVE.L	A2,-(SP)					;PUSH ADDR OF AN INV PT
		MOVE.L	FROMRECT(A6),-(SP)			;PUSH FROMRECT
		MOVE.L	TORECT(A6),-(SP)			;PUSH TORECT
		_MAPPT								;MAP THIS POINT
		ADD.L	#4,A2						;BUMP TO NEXT POINT
MORE	DBRA	D6,LOOP 					;LOOP ALL INVERSION POINTS

		MOVE.L	(A3),-(SP)					;PUSH PTBUF PTR
		MOVE	D7,-(SP)					;PUSH PTCOUNT
		_SORTPOINTS							;SortPoints(ptBuf^,ptCount)

		MOVE.L	(A3),-(SP)					;PUSH PTBUF PTR
		MOVE	D7,PTCOUNT(A6)				;PUT PTCOUNT IN MEMORY
		PEA 	PTCOUNT(A6) 				;PUSH VAR PTCOUNT
		_CULLPOINTS							;CullPoints(ptBuf^,ptCount)

		MOVE.L	A3,-(SP)					;PUSH PTBUF HANDLE
		MOVE	PTCOUNT(A6),-(SP)			;PUSH PTCOUNT
		MOVE.L	A4,-(SP)					;PUSH RGN
		_PACKRGN 							;PackRgn(ptBuf,ptCount,rgn);

		MOVE.L	A3,A0						;PUSH PTBUF HANDLE
		_DisposHandle						;DISCARD IT

DONE	MOVEM.L (SP)+,D3/D6-D7/A2-A4		;RESTORE REGS
		UNLINK	PARAMSIZE,'MAPRGN  '


		ENDPROC 


;________________________________________________________________________________
;

;  version of Tuesday, March 28, 1989

; Purpose:
;  To convert bitmaps to regions.
;
;				PRINT			PUSH,OFF
;				INCLUDE			'Traps.a'
;				INCLUDE			'ToolEqu.a'
;				INCLUDE			'QuickEqu.a'
;				INCLUDE			'SysEqu.a'
;				PRINT			POP
;				LOAD			'AIncludes.d'


;________________________________________________________________________________
;
; 		FUNCTION BitMapRgn(region:RgnHandle; bMap:BitMap): OSErr; INLINE $A8D7;
;
; 		Given a region and bitmap, BitMapRgn makes the region a bounding
;		region for the 'map. If it can't get memory it will return a
;		Memory Manager-type error and an empty region gibbley. Note that
;		the region might also be empty with no error (if the bounds is an
;		empty rectangle or there are no 1 bits in the bitmap). Lastly,
;		if the region would have to exceed 32K it returns a result of
;		-500 (rgnTooBigErr).
;
;		The bMap parameter may be a pointer to a bitmap, a pointer to a 
;		pixmap, or a pointer to a portBits field in a color grafport.
;		In the latter two cases, if the pixmap is not 1-bit deep, an error
;		result of -148 (pixmapTooDeepErr) is returned.
;
; 		(the nibble state machine idea is from the Finder MaskToRgn routine)
;
;	History
;		2/19/88	 RBB	changed to take in washing and handle rect. & empties properly
;						also now finds minimum rectangle to enclose region
;		*** version of 2/22/88 ***
;		2/23/88	 RBB	putting in numerous optimizations recommended by Darin
;		4/4/88   RBB	trying to re-do lost work from March
;		         DBA
;		3/28/89	 CSD	adjusted setup to know about pixmaps and portBits
;
;________________________________________________________________________________
;
;Theory
;		We scan each line of the bitmap and pump inversion points (ip's) into the region
;		to put the areas with ones in the bitmap into the region and the areas
;		with zeroes outside the region.
;
;		In order to keep track of where we are in "inversion land" we use two
;		techniques:

;		The first is a scanline buffer which records the changes
;		(zeroes to ones and vice versa) as we go. Wherever a change occurs (a
;		1 next to a 0 in the buffer) we need to put out an inversion point.

;		The second is a togglin' flag which tells us whether we are "inverted" or not.
;		Since we use a state machine in the innermost (nibble) loop to churn out
;		ip's, the input to the state machine must be complemented if the flag is set.

;		The loop stuff looks like this:
;			outer line loop (grows handle in anticipation of worst case for next line)
;			longword loop for current line (puts out inter-long ip's as needed)
;			loop for 4 nibbles in current long (calls state maching for each nibble)
;
;________________________________________________________________________________


BitMapRgn	PROC	EXPORT

BMFrame		RECORD	{A6Link},DECR
result		DS.W	1

paramTop	EQU		*

regionH		DS.L	1
bMapPtr		DS.L	1

paramSize	EQU		paramTop-*

return		DS.L	1
A6Link		DS.L	1

rowLongs	DS.L	1							;number of longwords per line
rightMask	DS.L	1							;mask for rightmost long of each line
slHandle	DS.L	1							;handle to scanline buffer
numLines	DS.W	1							;number of lines in bitmap
rowNumBytes	DS.W	1							;rowbytes from the bitmap
startSize	DS.L	1							;size of region at start of line
lastLineH	DS.L	1							;last line (zeroes) handle

handSize	DS.L	1							;size of handle (avoid calls to GetHandleSize)
max2Add		DS.L	1							;worst case for bytes we could add for next line
MMUSave		ds.b	2							;keep it even!
SrcPixMap	ds.b	PMREC+CTREC+20 				;room for pixmap and color table

localSize	EQU		*
			ENDR

		WITH	BMFrame
		LINK	A6,#localSize
		MOVEM.L	A2-A5/D3-D7,-(SP)				;save work registers

		CLR.L	slHandle(A6)					;no scanline handle, yet
		CLR.W	result(A6)						;function result presumed zero at start

		MOVE.L	regionH(A6),A0
		MOVE.L	(A0),A2
		MOVEQ	#0,D0
		MOVE.W	(A2),D0							;get size of region
		MOVE.L	D0,handSize(A6)					;save it long
;
; Convert bitmap/pixmap to a pixmap
;
		move.l	bMapPtr(a6),a1
		lea		SrcPixMap(a6),a2
		_BitsToPix
		
;get boundary rectangle so we can tell how to process the bitmap

		lea		SrcPixMap(A6),A1				;get bitmap pointer
		CMP.W	#1, pmPixelSize(A1)				;is it 1 bit per pixel deep?
		BEQ.S	@1								;if yes, we're fine
		MOVE.W	#pixmapTooDeepErr, D0			;return an error otherwise
		BRA		BMRBadEmpty						;clean up and bail out
@1
		MOVE.W	rowBytes(A1), rowNumBytes(A6)	;get the rowbytes from the bit/pixmap
		ANDI.W	#$7FFF, rowNumBytes(A6)			;mask off pixmap flag
		MOVE.L	bounds+topLeft(A1),D2			;get topLeft
		MOVE.W	bounds+right(A1),D0				;get right

;figure the number of longs per row (according to width, not rowbytes)
;so we can get a scanline buffer

		SUB.W	D2,D0							;right - left
		BLE		BMREmptyOut						;if empty rect. then empty region
		EXT.L	D0
		MOVE.L	D0,D4
		ADD.L	D4,D4							;double width for 2 bytes/ip
		ADDQ.L	#4+2,D4							;add 4 bytes for y value and $7FFF word
												;add 2 more for the $7FFF if the last line
		ADD.L	D4,D4							;double, just 'cause I feel like it!
		MOVE.L	D4,max2Add(A6)					;save max. bytes for a given line

		MOVEQ	#32,D7							;(side effect: clear high word of D7)
		DIVU	D7,D0							;number of longs = width/32

;get a mask for the rightmost long into rightMask

		MOVE.L	D0,D3							;save remainder(hi word)
		SWAP	D3								;get remainder from width/32
		MOVEQ	#-1,D1							;default rightmost long mask
		TST.W	D3								;zero remainder?
		BEQ.S	@0								;yes, $FFFF is a good mask
		ADDQ.W	#1,D0							;we need one more long
		SUB.W	D3,D7							;32 - remainder = zero bits to shift in
		ASL.L	D7,D1							;get proper mask
@0		MOVE.L	D1,rightMask(A6)
		EXT.L	D0
		MOVE.L	D0,rowLongs(A6)					;save # of longs
		ASL.L	#2,D0							;longs => bytes

;get the scanline buffer (D0 = number of bytes per line)
		_NewHandle clear 						;get a scanline buffer (of zeroes)
		BNE		BMRBadEmpty						;if we failed then return a NIL handle

		MOVE.L	A0,slHandle(A6)					;save buffer handle

;figure the number of lines

		MOVE.L	D2,D3
		SWAP	D3								;get top
		MOVE.W	bounds+bottom(A1),D0			;get bottom
		SUB.W	D3,D0							;bottom - top
		BLE		BMREmptyOut						;if empty rect. then empty region

		MOVE.W	D0,numLines(A6)					;number of lines

		MOVE.L	baseAddr(A1),a4					;point to start of map
		MOVE.W	#rgnData,D7						;initial region size

;OK, now we start the loops.
;	A1 will point to the bitmap long,
;	A2 to the region.
;	A3 points to the current scanline buffer long.
;	A4 will point to the row in the map.
;	A5 points to the current word (= size + A2)
;	D1 holds the current long (modified).
;	D2 holds the leftmost coordinate of bitmap.bounds.
;	D3 has the y coordinate, and
;	D4 the x coordinate (high word stays clear!).
;	D5 has number of longs remaining for current line.
;	D6 holds the (on or off) value of the "beam" (for the line).
;	D7 holds the size outside the longword loop (used as scratch while nibbling).
;	   (we assume at the very end that D7's high word has remained clear)

;
; goto 32-bit mode
;
		moveq	#true32b,d0					;switch to 32 bit addressing
		_rSwapMMUMode			;get previous mode in d0.b (can trash a0/a1/a2, d0/d1/d2)
		move.b	d0,MMUsave(a6)				;save previous state for later
		
BMRHScramLine
		MOVE.L	regionH(A6),A2
		MOVE.L	(A2),d0
		_StripAddress							;clean it up	<9>
		move.l	d0,a2							;point to start of region

BMRLineLoop
  		LEA		(A2,D7.L),A5					;point to new region start + size

		MOVE.L	handSize(A6),D1					;get handle size
		SUB.l	D7,D1							;handle size - region size
		CMP.L	max2Add(A6),D1					;is there enough for worst case on next line?
		BGE.S	@1								;skippy if so

		MOVE.L	handSize(A6),D0					;get handle size
		ADD.L	max2Add(A6),D0					;add more than enough for worst case on next line
		MOVE.L	D0,handSize(A6)					;save new size
;
; go back to previous mode
;
		move.b	MMUsave(a6),d0					;get previous MMU state in d0
		_rSwapMMUMode							;get previous mode in d0.b (can trash a0/a1/a2, d0/d1/d2)
		
		MOVE.L	handSize(A6),d0					;save new size
		MOVE.L	regionH(A6),A0					;region handle
		_SetHandleSize
		BNE		BMRBadEmpty						;if we failed then return a NIL handle
;
; goto 32-bit mode
;
		moveq	#true32b,d0					;switch to 32 bit addressing
		_rSwapMMUMode
		BRA.S	BMRHScramLine					;rederef. handle and recompute current pointer
@1

		MOVE.W	D2,D4							;get current x coordinate from left
		MOVEQ	#0,D6							;beam initially off
		MOVE.L	A4,A1							;start of current line into map pointer
		MOVE.L	rowLongs(A6),D5					;longs remaining for current line
		MOVE.L	slHandle(A6),A3					;A3 points to the current "differences" long
		MOVE.L	(A3),A3

; Note: within this loop we assume that nothing will be done to move the heap

		MOVE.W	D3,D0							;get y position
		BSR		OutputRgnWord					;output y pos to region

		MOVE.l	D7,startSize(A6)				;save size at line start (a la Derwood)
		BRA		NextBMRLong						;enter the long loop

BMRLongLoop
		MOVE.L	(A1)+,D0						;fetch the next long for this line
BMRLastLEntry
		MOVE.L	(A3),D1							;get differences long

		EOR.L	D0,D1							;compute the differences
		BNE		BMRDiff							;if not the same, skip ahead

BMRSame
;since we want to skip this long (it matches the previous line) we need to
;put out an ip if the beam is on
 		TST.B	D6								;beam on?
 		BEQ.S	@1								;skip if not
 		MOVE.W	D4,(A5)+						;pump it out
 		MOVEQ	#0,D6							;beam off

@1
		ADD.W	#32,D4							;slip to next long's x coordinate
@2 		ADDQ.W	#4,A3							;to next changes buffer long
		BRA		NextBMRLong

;----------------------------------------------------------------------------------------

; Start of State Machine

; Handle state 0001

BMRState1
		ADDQ.W	#3,D4							;bump x by 3
State1Common
		MOVE.W	D4,(A5)+						;generate one
;Tog1StateDone
		ADDQ.W	#1,D4							;bump x by one more
TogStateDone
		NOT.B	D6								;toggle state
		RTS

; Handle state 0010

BMRState2
		ADDQ.W	#2,D4							;bump x by 2
		MOVE.W	D4,(A5)+						;generate one
Gen1BumpBy1
		BSR.S	Gen1InvPoint					;and another one
BumpBy1
		ADDQ.W	#1,D4							;bump once more
		RTS										;state doesn't change

; Handle state 0011

BMRState3
		ADDQ.W	#2,D4							;bump x by 2
		MOVE.W	D4,(A5)+						;generate one
		ADDQ.W	#2,D4							;bump
		BRA.S	TogStateDone					;toggle the state

; Handle state 0100

BMRState4
		BSR.S	Gen1InvPoint
		BSR.S	Gen1InvPoint
BumpBy2
		ADDQ.W	#2,D4
		RTS

; Handle state 0101

BMRState5
		BSR.S	BMRState4						;start out as state 4
		SUBQ	#1,D4
		BRA.S	State1Common					;use common code

; Handle state 0110

BMRState6
		BSR.S	Gen1InvPoint
		ADDQ.W	#1,D4
		BRA.S	Gen1BumpBy1

; Handle state 0111

BMRState7
		BSR.S	Gen1InvPoint
		ADDQ.W	#3,D4
		BRA.S	TogStateDone

; Gen1InvPoint bumps x by one and then generates a horizontal inversion point

Gen1InvPoint
		ADDQ.W	#1,D4							;bump by 1, first
		MOVE.W	D4,(A5)+						;add x value (ip) to region
		RTS

; Handle State 1000

BMRState8
		MOVE.W	D4,(A5)+
		BSR.S	Gen1InvPoint
		ADDQ.W	#3,D4
		RTS

; Handle State 1001

BMRState9
		MOVE.W	D4,(A5)+
		BSR.S	Gen1InvPoint
		ADDQ.W	#2,D4
		BRA.S	State1Common

; Handle State 1010 (most complicated case)

BMRState10
		MOVE.W	D4,(A5)+
		BSR.S	Gen1InvPoint
		BSR.S	Gen1InvPoint
		BRA.S	Gen1BumpBy1

; Handle State 1011

BMRState11
		MOVE.W	D4,(A5)+
		BSR.S	Gen1InvPoint
		BSR.S	Gen1InvPoint
		ADDQ.W	#2,D4
		BRA.S	TogStateDone

; Handle State 1100

BMRState12
		MOVE.W	D4,(A5)+
		ADDQ.W	#2,D4
		MOVE.W	D4,(A5)+
		BRA.S	BumpBy2

; Handle State 1101

BMRState13
		BSR.S	BMRState12
		SUBQ	#1,D4
		BRA.S	State1Common

; Handle State 1110

BMRState14
		MOVE.W	D4,(A5)+
		ADDQ.W	#3,D4
		MOVE.W	D4,(A5)+
		BRA.S	BumpBy1

; State table

BMRHandler
		BRA.S	BMRState0
		BRA.S	BMRState1
		BRA.S	BMRState2
		BRA.S	BMRState3

		BRA.S	BMRState4
		BRA.S	BMRState5
		BRA.S	BMRState6
		BRA.S	BMRState7

		BRA.S	BMRState8
		BRA.S	BMRState9
		BRA.S	BMRState10
		BRA.S	BMRState11

		BRA.S	BMRState12
		BRA.S	BMRState13
		BRA.S	BMRState14

; Handle State 15 or 1111

BMRState15
		MOVE.W	D4,(A5)+						;generate one now
		NOT.B	D6								;toggle the state

; Handle State 0 or 0000

BMRState0
		ADDQ.W	#4,D4
		RTS

; End of the State Guys

;----------------------------------------------------------------------------------------

BMRDiff
		MOVE.L	D0,(A3)+						;fix up scanline buffer for next time

; this long is different from the last one, so output a bunch
; of inversion points by pumping it through the state machine, a nibble
; at a time.

		MOVEQ	#3,D7							;4 bytes to process (D7 high word clear)
		MOVEQ	#0,D0							;prevent need to mask for first nibble

; here is the loop where we feed it through a nibble at a time.
; it's worth it to special case a whole byte of 0

BMRByteLoop
		ROL.L	#8,D1							;get next (topmost) byte
		TST.B	D1								;is it zero?
		BNE.S	BMRNibble						;if not, 4 bits at a time

		TST.B	D6
		BNE.S	BMRNibble						;if beam on, must pass through

;the top 8 are zero, so we can save some time

		ADDQ.W	#8,D4							;bump x
		BRA.S	BMRNextByte

;take care of the rightmost long for a line

BMRLastLong
		MOVE.L	(A1),D0							;fetch the long from the bitmap
		AND.L	rightMask(A6),D0				;mask off right bits that aren't in map
		BRA		BMRLastLEntry					;go process this long

; handle the first nibble

BMRNibble
		MOVE.B	D1,D0							;get byte
		EOR.B	D6,D0							;invert nibble when beam is on
		LSR.B	#4,D0							;get 1st nibble
		ADD.W	D0,D0							;double for word index

		JSR		BMRHandler(D0.W)				;invoke the handler

; handle the second nibble

		MOVE.B	D1,D0							;get byte again
		EOR.B	D6,D0							;invert nibble when beam is on
		AND.W	#%1111,D0						;mask to it
		ADD.W	D0,D0							;double for word index

		JSR		BMRHandler(D0.W)				;invoke the handler

BMRNextByte
		DBRA	D7,BMRByteLoop					;loop for all 8 nibbles

; bump to the next long

NextBMRLong
		SUBQ.W	#1,D5							;decrement longword index
		BGT		BMRLongLoop						;not at end, loop for whole line
		BEQ.S	BMRLastLong						;process last long for this line

; we've reached the end of the (this) line
BMREOL
		MOVE.l	A5,D7							;current region pointer
		SUB.l	A2,D7							;figga region size
		CMP.l	startSize(A6),D7				;did we add inv. pts to this line?
		BEQ.S	BMRNoLine						;br = no, so back up
		BLT		BMR64KErr						;if the size decreased, we overflowed

; if the state is on, generate one last inversion point

		TST.B	D6
		BEQ.S	@1

		MOVE.W	D4,(A5)+						;generate a last one
		ADDQ.l	#2,D7							;keep sizable advantage
@1

; end the scan line with the traditional $7FFF

		BSR.S	OutputLastRgnWord

BMREOL2
		ADDQ.W	#1,D3							;bump y position
		MOVE.W	D2,D4							;start x at left again
		ADD.W	rowNumBytes(A6),A4				;bump to next row in map
		SUBQ.W	#1,numLines(A6)
		BGT		BMRLineLoop						;if we're not done then do next line
		BLT.S	BMRFinis						;br if really done

; as the last line process an imaginary line of zeroes to end the region…
		move.b	MMUsave(a6),d0					;get previous MMU state in d0		<9>
		_rSwapMMUMode							;(can trash a0/a1/a2, d0/d1/d2)		<9>

		MOVE.L	rowLongs(A6),D0
		ASL.L	#2,D0							;longs => bytes
		_NewHandle clear						;get a full line of zero bits
		BNE		BMRBadEmpty						;if we failed then return a NIL handle
		MOVE.L	A0,lastLineH(A6)				;save handle
		MOVE.L	(A0),A4							;start of current line
;
; Since we just allocated this handle, there is no need to strip it since the flags are guaranteed
; to be zero.
;
		moveq	#true32b,d0						;switch to 32 bit addressing		<9>
		_rSwapMMUMode							;									<9>
		BRA		BMRHScramLine					;do this last one (and rederef handle)

BMRNoLine
		SUBQ.L	#2,A5							;back up pointer
		SUBQ.l	#2,D7							;back down size
		BRA.S	BMREOL2							;go for next line

; Append the "end of line" token to the region

OutputLastRgnWord
		MOVE.W	#$7FFF,D0

; OutputRgnWord takes the word in D0, appends it to the region,
; and leaves the condition codes set for ADDQ.l D7 (which contains the length)

OutputRgnWord
		MOVE.W	D0,(A5)+						;put a word to the region
		ADDQ.l	#2,D7							;ink the size
		RTS


; all done:  Restore MMU Mode, clean up, and output the final $7FFF
;
BMRFinis
		move.b	MMUsave(a6),d0				;get previous MMU state in d0
		_rSwapMMUMode						;get previous mode in d0.b (can trash a0/a1/a2, d0/d1/d2)

		MOVE.L	lastLineH(A6),A0
		_DisposHandle						;get rid of that last line of zeroes

		CMP.l	#10,D7							;is region empty of inversion points?
		BEQ.S	BMREmptyOut						;skip if so (it's an empty region)

		BSR.S	OutputLastRgnWord				;put End-O-Region ($7FFF) word
;
; check if rgn > 64K
;
		cmp.l	#$0000FFFF,d7
		BGT.S	BMR64KErr						;if larger than $FFFF, we overflowed!

; find the smallest rectangle that encompasses all the inversion points
; A0 will point to the current region word, A1 to the start of the line
; D1 will have the smallest x, D2 the largest x, D4 will contain $7FFF
; D3 gets the smallest y value (which we know at the start)

		LEA		rgnData(A2),A0					;point A0 past the rgnBBox
		MOVE.W	#$7FFF,D4
		MOVE.W	D4,D1							;smallest x so far = $7FFF
		MOVE.W	#$8000,D2						;largest x so far = -32768
		MOVE.W	(A0),D3							;smallest y there is
		BRA.S	BMRPackStart					;enter loop

BMRPackY
		MOVE.L	A0,A1							;remember where the y value is (sort of)

		CMP.W	(A0)+,D1						;less than smallest x so far?
		BLE.S	@1								;skip if not
		MOVE.W	-2(A0),D1						;new smallest x

@1		CMP.W	(A0)+,D4						;end of line?
		BNE.S	@1								;if not then keep looking

		CMP.W	-4(A0),D2						;last x greater than largest x so far?
		BGE.S	BMRPackStart					;skip if not
		MOVE.W	-4(A0),D2						;new largest x

BMRPackStart
		MOVE.W	(A0)+,D0						;get next word (y value or $7FFF)
		CMP.W	D4,D0							;if $7FFF then we're done
		BNE.S	BMRPackY						;otherwise loop

		SWAP	D3								;top into top word
		MOVE.W	D1,D3							;left into bottom word
		MOVE.W	-2(A1),D4						;bottom (from last y at start of line)
		SWAP	D4								;move bottom to high word
		MOVE.W	D2,D4							;get right

		CMP.l	#28,D7							;size = 28? (do we have a rect. region?)
		BEQ.S	BMRRect							;skip if so

		BRA.S	BMROut							;return complex region

;the region would exceed 64K, so we have to error out, man
BMR64KErr
		move.b	MMUsave(a6),d0				;get previous MMU state in d0
		_rSwapMMUMode						;get previous mode in d0.b (can trash a0/a1/a2, d0/d1/d2)
		MOVE.W	#rgnTooBigErr,D0				;if >32K needed return error

;we come here after failing a SetHandleSize (or NewHandle)
BMRBadEmpty
		MOVE.W	D0,result(A6)					;OSErr function result

; emptify the region on errors (or when it should be empty with no error)
BMREmptyOut
		MOVE.L	regionH(A6),A0					;handle to region
		MOVE.L	(A0),A2							;point to it
		CLR.L	D3								;(0, 0) to topLeft
		CLR.L	D4								;(0, 0) to botRight

BMRRect
		MOVEQ	#10,D7							;the size of the region = 10

;output the region with size (longword, high word clear) in D7
;D3 comes in with topLeft, D4 with botRight
BMROut
		MOVE.W	D7,(A2)+						;the size of the region
		MOVE.L	D3,(A2)+						;topLeft to rgnBBox
		MOVE.L	D4,(A2)							;botRight to rgnBBox
		MOVE.L	D7,D0							;size
		MOVE.L	regionH(A6),A0					;handle to region
		_SetHandleSize

BMRDspSL
		MOVE.L	slHandle(A6),A0
		_DisposHandle						;get rid of the scanline buffer (even if NIL)

BMRDone
		MOVEM.L	(SP)+,A2-A5/D3-D7				;restore work registers
		UNLK	A6
		MOVE.L	(SP)+,A0						;pop return address
		ADD 	#paramSize,SP					;pop params
		JMP 	(A0)
		ENDWITH

		ENDPROC