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QuickDraw/Lines.a
Jonathan Ragan-Kelley 646aa270df initial import
2010-07-20 21:37:29 -07:00

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.INCLUDE GRAFTYPES.TEXT
;-----------------------------------------------------------------
;
;
; * *** * * ***** ***
; * * * * * * *
; * * ** * * *
; * * * * * *** ***
; * * * ** * *
; * * * * * * *
; ***** *** * * ***** ***
;
;
;
; Line Drawing Rountines
;
.PROC StdLine,1
.REF CheckPic,PutPicVerb,PutPicByte,PutPicLong,DoLine
;---------------------------------------------------------------
;
; PROCEDURE StdLine(newPt: Point);
;
PARAMSIZE .EQU 4
NEWPT .EQU PARAMSIZE+8-4
LINK A6,#0 ;NO LOCAL VARS
MOVEM.L D5-D7/A3-A4,-(SP) ;SAVE REGS
JSR CHECKPIC ;SET UP A4,A3 AND CHECK PICSAVE
BLE.S NOTPIC ;BRANCH IF NOT PICSAVE
MOVE.B #FRAME,-(SP) ;PUSH VERB
JSR PutPicVerb ;CHECK pnSize, pnMode, pnPat
;--------------------------------------------------------
;
; PUT ONE OF FOUR LINE OPCODES BASED ON NEWPT AND DH,DV.
;
; line 20, pnLoc(pt), newPt(pt)
; line from 21, newPt(pt)
; short line 22, pnLoc(pt), dh,dv(-128..127)
; short line from 23, dh,dv(-128..127)
;
MOVEQ #$20,D7 ;INIT OPCODE TO $20
MOVE.L PICSAVE(A3),A4 ;GET PICSAVE HANDLE
MOVE.L (A4),A4 ;DE-REFERENCE PICSAVE
MOVE.L PNLOC(A3),D0 ;GET CURRENT PNLOC
CMP.L PICPNLOC(A4),D0 ;IS LINE FROM LAST ENDPOINT ?
BNE.S NOTFROM ;NO, CONTINUE
ADDQ #1,D7 ;YES, SET BIT ZERO
NOTFROM MOVE NEWPT+H(A6),D6 ;GET NEWPT.H
SUB D0,D6 ;CALC DH = NEWPT.H - PNLOC.H
MOVE D6,D0 ;COPY DH
EXT.W D0
CMP.W D6,D0 ;IS DH -128..127 ?
BNE.S PUTOP ;NO, CONTINUE
MOVE NEWPT+V(A6),D5 ;GET NEWPT.V
SUB PNLOC+V(A3),D5 ;CALC DV = NEWPT.V - PNLOC.V
MOVE D5,D0 ;COPY DV
EXT.W D0
CMP.W D5,D0 ;IS DV -128..127 ?
BNE.S PUTOP ;NO, CONTINUE
ADDQ #2,D7 ;YES, SET BIT ONE IN OPCODE
PUTOP MOVE.B D7,-(SP)
JSR PutPicByte ;PUT ONE OF 4 LINE OPCODES
ROR #1,D7 ;DO WE NEED STARTPT ? (BIT 0)
BCS.S STARTOK ;NO, CONTINUE
MOVE.L PNLOC(A3),-(SP)
JSR PutPicLong ;YES, PUT STARTPT = PNLOC
STARTOK ROR #1,D7 ;IS LINE SHORT ? (BIT 1)
BCS.S DHDV ;YES, PUT DH,DV
MOVE.L NEWPT(A6),-(SP) ;NO, PUT LONG NEWPT
JSR PutPicLong ;PUT NEWPT TO THEPIC
BRA.S UPDATE
DHDV MOVE.B D6,-(SP) ;PUSH DH (-128..127)
JSR PutPicByte ;PUT TO THEPIC
MOVE.B D5,-(SP) ;PUSH DV (-128..127)
JSR PutPicByte ;PUT TO THEPIC
UPDATE MOVE.L PICSAVE(A3),A4 ;GET PICSAVE HANDLE
MOVE.L (A4),A4 ;DE-REFERENCE PICSAVE
MOVE.L NEWPT(A6),PICPNLOC(A4) ;UPDATE PICTURE SAVING STATE
NOTPIC MOVE.L NEWPT(A6),-(SP) ;PUSH NEWPT
JSR DoLine ;DoLine(newPt);
MOVEM.L (SP)+,D5-D7/A3-A4 ;RESTORE REGS
UNLINK PARAMSIZE,'STDLINE '
.PROC LineTo,2
.REF StdLine
;----------------------------------------------------------
;
; PROCEDURE LineTo(h,v: INTEGER);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L GRAFPROCS(A0),D0 ;IS GRAFPROCS NIL ?
LEA STDLINE,A0
BEQ.S USESTD ;YES, USE STD PROC
MOVE.L D0,A0
MOVE.L LINEPROC(A0),A0 ;NO, GET PROC PTR
USESTD JMP (A0) ;GO TO IT
.PROC Line,2
.REF LineTo
;----------------------------------------------------------
;
; PROCEDURE Line(dh,dv: INTEGER);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE PNLOC+H(A0),D0 ;GET CURRENT PENLOC.H
ADD D0,6(SP) ;ADD TO DH
MOVE PNLOC+V(A0),D0 ;GET CURRENT PENLOC.V
ADD D0,4(SP) ;ADD TO DV
JMP LineTo ;LineTo(pnLoc.h+dh,pnLoc.v+dv);
.PROC MoveTo,2
;----------------------------------------------------------
;
; PROCEDURE MoveTo(h,v: INTEGER);
;
MOVE.L (SP)+,A0 ;POP RETURN ADDR
MOVE.L GRAFGLOBALS(A5),A1 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A1),A1 ;POINT TO CURRENT GRAFPORT
MOVE.L (SP)+,PNLOC(A1) ;COPY POINT INTO PNLOC
JMP (A0) ;RETURN
.PROC MQVE,2
.DEF Moov
;----------------------------------------------------------
;
; PROCEDURE Move(dh,dv: INTEGER);
;
MOOV MOVE.L (SP)+,A0 ;POP RETURN ADDR
MOVE (SP)+,D0 ;POP DV
MOVE (SP)+,D1 ;POP DH
MOVE.L GRAFGLOBALS(A5),A1 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A1),A1 ;GET CURRENT GRAFPORT
ADD D0,PNLOC+V(A1) ;ADD DV TO PNLOC.V
ADD D1,PNLOC+H(A1) ;ADD DH TO PNLOC.H
JMP (A0) ;RETURN
.PROC DoLine,1
.REF DrawLine,PutLine,SetSize
;----------------------------------------------------------
;
; PROCEDURE DoLine(newPt: Point);
;
; { called by StdLine and StdPoly frame }
;
MOVEM.L D6-D7/A3-A4,-(SP) ;SAVE REGS
MOVE.L GRAFGLOBALS(A5),A4 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A4),A3 ;POINT TO CURRENT GRAFPORT
MOVE.L 20(SP),D7 ;GET NEWPT
MOVE.L PNLOC(A3),D6 ;OLDPT := THEPORT^.PNLOC
;
; CHECK IF WE ARE SAVING FOR A POLYGON
;
TST.L POLYSAVE(A3) ;ARE WE SAVING FOR A POLYGON ?
BEQ.S NOTPOLY ;NO, CONTINUE
MOVE.L THEPOLY(A4),A1 ;YES, GET POLYHANDLE
MOVE.L (A1),A0 ;DE-REFERENCE IT
MOVE (A0),D0 ;GET CURRENT POLYSIZE
CMP #10,D0 ;IS THIS THE FIRST POINT ?
BNE.S FIRSTOK ;NO, CONTINUE
MOVE.L D6,0(A0,D0) ;YES, INSTALL FIRST := OLDPT
ADD #4,D0 ;BUMP INDEX
FIRSTOK MOVE.L D7,0(A0,D0) ;INSTALL NEWPT AT END
ADD #4,D0 ;BUMP INDEX
MOVE D0,(A0) ;UPDATE INDEX
CMP POLYMAX(A4),D0 ;TIME TO MAKE BIGGER ?
BLT.S SIZEOK ;NO, CONTINUE
ADD #256,POLYMAX(A4) ;YES, GROW IN CHUNKS
MOVE.L A1,-(SP) ;PUSH POLYHANDLE
MOVE POLYMAX(A4),-(SP) ;PUSH NEW SIZE
JSR SETSIZE ;MAKE THEPOLY BIGGER
SIZEOK BRA.S NOTRGN ;DONT SAVE FOR RGN TOO
;
; IF NOT POLY, THEN CHECK FOR RGNSAVE.
; IF RGNSAVE THEN PutLine(oldPt,newPt,rgnBuf,rgnIndex,rgnMax);
;
NOTPOLY TST.L RGNSAVE(A3) ;ARE WE SAVING FOR A REGION ?
BEQ.S NOTRGN
MOVE.L D6,-(SP) ;PUSH OLDPT
MOVE.L D7,-(SP) ;PUSH NEWPT
MOVE.L RGNBUF(A4),-(SP) ;PUSH RGNBUF
PEA RGNINDEX(A4) ;PUSH VAR RGNINDEX
PEA RGNMAX(A4) ;PUSH VAR RGNMAX
JSR PUTLINE ;ADD INVERSION PTS TO RGNBUF
NOTRGN MOVE.L D6,-(SP) ;PUSH OLDPT
MOVE.L D7,-(SP) ;PUSH NEWPT
JSR DRAWLINE ;DRAW THE LINE
MOVE.L D7,PNLOC(A3) ;UPDATE THEPORT^.PNLOC
MOVEM.L (SP)+,D6-D7/A3-A4 ;RESTORE REGS
MOVE.L (SP)+,(SP) ;STRIP PARAM
RTS ;AND RETURN
.PROC HidePen,0
.DEF ShowPen
;----------------------------------------------------------
;
; PROCEDURE HidePen;
;
MOVEQ #-1,D0
BRA.S SHARE
;----------------------------------------------------------
;
; PROCEDURE ShowPen;
;
ShowPen MOVEQ #1,D0
SHARE MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT PORT
ADD D0,PNVIS(A0) ;INCREMENT/DECREMENT PNVIS
RTS ;AND RETURN
.PROC GetPenState,1
.DEF SetPenState
;----------------------------------------------------------
;
; PROCEDURE GetPenState(VAR pnState: PenState);
; PROCEDURE SetPenState(pnState: PenState);
;
MOVEQ #1,D0 ;SET A FLAG
BRA.S SHARE ;AND SHARE CODE
SetPenState
CLR D0 ;CLEAR FLAG AND SHARE
SHARE MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
LEA PNLOC(A0),A0 ;POINT TO PNLOC
MOVE.L 4(SP),A1 ;POINT TO VAR PNSTATE
TST D0 ;is this SET penstate ?
BNE.S NOTSET ;NO, CONTINUE
EXG A0,A1 ;YES, SWAP SRC AND DST
NOTSET MOVE.L (A0)+,(A1)+ ;COPY PNLOC FROM THEPORT
MOVE.L (A0)+,(A1)+ ;COPY PNSIZE FROM THEPORT
MOVE.W (A0)+,(A1)+ ;COPY PNMODE FROM THEPORT
MOVE.L (A0)+,(A1)+ ;COPY PNPAT FROM THEPORT
MOVE.L (A0)+,(A1)+ ;ALL 8 BYTES
MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
.PROC GetPen,1
;----------------------------------------------------------
;
; PROCEDURE GetPen(VAR pt: Point);
; { inquire the current pen location }
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L 4(SP),A1 ;POINT TO VAR PT
MOVE.L PNLOC(A0),(A1) ;GET PNLOC FROM THEPORT
MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
.PROC PenSize,2
;----------------------------------------------------------
;
; PROCEDURE PenSize(width,height: INTEGER);
; { set the pen width and height }
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L 4(SP),PNSIZE(A0) ;SET PEN WIDTH AND HEIGHT
MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
.PROC PenMode,1
.REF PortWord
;----------------------------------------------------------
;
; PROCEDURE PenMode(mode: INTEGER);
; { set the transfer mode for line drawing }
;
MOVEQ #PNMODE,D0 ;PUT PORT OFFSET IN D0
JMP PORTWORD ;INSTALL PARAM INTO THEPORT
.PROC PenPat,1
;----------------------------------------------------------
;
; PROCEDURE PenPat(pat: Pattern);
; { set the pattern for line drawing }
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
LEA PNPAT(A0),A0 ;POINT TO PNPAT
MOVE.L 4(SP),A1 ;POINT TO INPUT PATTERN
MOVE.L (A1)+,(A0)+ ;COPY PATTERN INTO THEPORT
MOVE.L (A1)+,(A0)+ ;ALL 8 BYTES
MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
.PROC PenNormal,0
;----------------------------------------------------------
;
; PROCEDURE PenNormal;
; { restore all line drawing parameters to normal }
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L #$00010001,PNSIZE(A0) ;PEN SIZE:=1,1
MOVE #8,PNMODE(A0) ;PENMODE:=PATTERN COPY
MOVEQ #-1,D0
MOVE.L D0,PNPAT(A0) ;PNPAT:=BLACK
MOVE.L D0,PNPAT+4(A0)
RTS
.END
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