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mac-rom/QuickDraw/Lines.a

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;
; File: Lines.a
;
; Contains: Line Drawing Routines
;
; Copyright: © 1981-1990, 1992 by Apple Computer, Inc., all rights reserved.
;
; Change History (most recent first):
;
; <SM2> 6/11/92 stb <sm 6/9/92>stb Synch with QDciPatchROM.a, added comment to
; StdLine.
; <6> 1/15/92 KC Fix "If last BRA.S to import is to next instruction, BAD CODE
; will be generated" assembler warning.
; <5> 8/31/90 SMC Made cleaner fix of revision <3>.
; <4> 8/31/90 SMC Fixed long JSR code added in revision <3>.
; <3> 5/30/90 HJR Fix out of range link error by essentially adding a BigJSR.
; <2> 5/30/90 JT Line, LineTo, Move, and MoveTo now clear the horizontal pen
; fraction.
; <¥1.4> 5/29/89 BAL Blasting in 32-Bit QuickDraw version 1.0 Final
; <¥1.3> 4/12/89 BAL Blasting in 32-Bit QuickDraw 1.0B1
; 1/8/89 BAL Vectorized CheckPic, DoLine
; 8/11/86 EHB Modified PenPat for color patterns
;
; To Do:
;
BLANKS ON
STRING ASIS
;-----------------------------------------------------------------
;
;
; * *** * * ***** ***
; * * * * * * *
; * * ** * * *
; * * * * * *** ***
; * * * ** * *
; * * * * * * *
; ***** *** * * ***** ***
;
StdLine PROC EXPORT
IMPORT PutPicVerb,PutPicByte,PutPicLong,PutPicOp,StdDevLoop
;---------------------------------------------------------------
;
; PROCEDURE StdLine(newPt: Point);
;
;Êfrom QDciPatchROM.a <sm 6/9/92>stb
PARAMSIZE EQU 4
NEWPT EQU PARAMSIZE+8-4
VARSIZE EQU 0 ;TOTAL SIZE OF LOCALS
LINK A6,#VARSIZE ;ALLOCATE STACK FRAME
MOVEM.L D5-D7/A3-A4,-(SP) ;SAVE REGS
_CheckPic ;SET UP A4,A3 AND CHECK PICSAVE
BLE.S NOTPIC ;BRANCH IF NOT PICSAVE
MOVE.B #FRAME,-(SP) ;PUSH VERB
bsr.l 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 D7,-(SP) ;PUSH THE OPCODE
bsr.l PutPicOp ;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)
bsr.l 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
bsr.l PutPicLong ;PUT NEWPT TO THEPIC
BRA.S UPDATE
DHDV MOVE.B D6,-(SP) ;PUSH DH (-128..127)
bsr.l PutPicByte ;PUT TO THEPIC
MOVE.B D5,-(SP) ;PUSH DV (-128..127)
bsr.l 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
; 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
MOVEM.L (SP)+,D5-D7/A3-A4 ;RESTORE REGS
UNLINK PARAMSIZE,'STDLINE '
;---------------------------------------------------------------
;
; PROCEDURE GetRect(VAR theRect: rect);
;
; RETURN THE OBJECT'S RECTANGLE
; MAKE A RECTANGLE OUT OF NEWPT AND PNLOC AND ADJUST FOR PNSIZE
;
GetRect MOVE.L (SP)+,A0 ;GET RETURN ADDRESS
MOVE.L (SP)+,A1 ;GET DST RECT
MOVE.L NEWPT(A6),D0 ;GET NEWPT
MOVE.L PNLOC(A3),D1 ;GET CURRENT PENLOC
CMP D0,D1 ;COMPARE HORIZONTAL COORDS
BGT.S @1 ;=>D1 CONTAINS LARGER = RIGHT
EXG D0,D1 ;ELSE SWAP THEM
@1 MOVE D0,LEFT(A1) ;SET LEFT
ADD PNSIZE+H(A3),D1 ;EXTEND RIGHT FOR PEN
MOVE D1,RIGHT(A1) ;SET RIGHT
SWAP D0
SWAP D1
CMP D0,D1 ;COMPARE VERTICAL COORDS
BGT.S @3 ;=>D1 CONTAINS LARGER = RIGHT
EXG D0,D1 ;ELSE SWAP THEM
@3 MOVE D0,TOP(A1) ;SET TOP
ADD PNSIZE+V(A3),D1 ;EXTEND BOTTOM FOR PEN
MOVE D1,BOTTOM(A1) ;SET BOTTOM
JMP (A0) ;AND RETURN
;---------------------------------------------------------------
;
; PROCEDURE StdDraw;
;
; DRAW THE OBJECT
;
StdDraw MOVE.L NEWPT(A6),-(SP) ;PUSH NEWPT
_DoLine ;DOLINE(NEWPT);
DONESD RTS
LineTo PROC EXPORT
;----------------------------------------------------------
;
; PROCEDURE LineTo(h,v: INTEGER);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
IF hasPenFraction THEN
move.w #$8000,pnLocFixed(a0) ; reset pen fraction.
ENDIF
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L GRAFPROCS(A0),D0 ;IS GRAFPROCS NIL ?
MOVE.L JStdLine,A0 ;get piece of trap table
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
Line PROC EXPORT
IMPORT LineTo
;----------------------------------------------------------
;
; PROCEDURE Line(dh,dv: INTEGER);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
IF hasPenFraction THEN
move.w #$8000,pnLocFixed(a0) ; reset pen fraction.
ENDIF
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);
MoveTo PROC EXPORT
EXPORT CommonMoveEnd
;----------------------------------------------------------
;
; PROCEDURE MoveTo(h,v: INTEGER);
;
MOVE.L (SP)+,A0 ;POP RETURN ADDR
MOVE.L GRAFGLOBALS(A5),A1 ;POINT TO QUICKDRAW GLOBALS
IF hasPenFraction THEN
move.w #$8000,pnLocFixed(a1) ; reset pen fraction.
ENDIF
MOVE.L THEPORT(A1),A1 ;POINT TO CURRENT GRAFPORT
MOVE.L (SP)+,PNLOC(A1) ;COPY POINT INTO PNLOC
CommonMoveEnd
; If this is a new color port, also clear the fractional position field
TST PORTBITS+ROWBYTES(A1) ;is it a new port?
BPL.S @skipFract ;no, all done
MOVE #$8000,pnLocHFrac(A1) ;initialize to 1/2
@skipFract
JMP (A0) ;RETURN
MOVE PROC EXPORT
EXPORT Moov
IMPORT CommonMoveEnd
;----------------------------------------------------------
;
; 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
IF hasPenFraction THEN
move.w #$8000,pnLocFixed(a1) ; reset pen fraction.
ENDIF
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
BRA.S CommonMoveEnd ;clear fraction and return
NOP ; silence the assembler <6>
DoLine PROC EXPORT
IMPORT DrawLine,PutLine,SetHSize
;----------------------------------------------------------
;
; 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
moveq #0,d0 ;clear out high end @@@@ <08May88> BAL
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.L) ;YES, INSTALL FIRST := OLDPT @@@@ <08May88> BAL
ADD #4,D0 ;BUMP INDEX
bcs.s SIZEOK ;poly is full don't resize @@@@ <08May88> BAL
FIRSTOK MOVE.L D7,0(A0,D0.L) ;INSTALL NEWPT AT END @@@@ <08May88> BAL
ADD #4,D0 ;BUMP INDEX
MOVE D0,(A0) ;UPDATE INDEX
CMP POLYMAX(A4),D0 ;TIME TO MAKE BIGGER ?
Bcs.S SIZEOK ;NO, CONTINUE @@@@ <08May88> BAL
ADD #256,POLYMAX(A4) ;YES, GROW IN CHUNKS
MOVE.L A1,-(SP) ;PUSH POLYHANDLE
MOVE POLYMAX(A4),-(SP) ;PUSH NEW SIZE
BSR.L SetHSize ;MAKE THEPOLY BIGGER <5>
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
_PUTLINE ;ADD INVERSION PTS TO RGNBUF
NOTRGN MOVE.L D6,-(SP) ;PUSH OLDPT
MOVE.L D7,-(SP) ;PUSH NEWPT
_DRAWLINE ;DRAW THE LINE
MOVE.L D7,PNLOC(A3) ;UPDATE THEPORT^.PNLOC
; If this is a new color port, also clear the fractional position field
TST PORTBITS+ROWBYTES(A3) ;is it a new port?
BPL.S @skipFract ;no, all done
MOVE #$8000,pnLocHFrac(A3) ;initialize to 1/2
@skipFract
MOVEM.L (SP)+,D6-D7/A3-A4 ;RESTORE REGS
MOVE.L (SP)+,(SP) ;STRIP PARAM
RTS ;AND RETURN
HidePen PROC EXPORT
EXPORT 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
GetPenState PROC EXPORT
EXPORT SETPENSTATE
;----------------------------------------------------------
;
; PROCEDURE GetPenState(VAR pnState: PenState);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE PORTBITS+ROWBYTES(A0),D1 ;KEEP ROWBYTES IN D1
LEA PNLOC(A0),A0 ;POINT TO PNLOC
MOVE.L 4(SP),A1 ;POINT TO VAR PNSTATE
NOTSET MOVE.L (A0)+,(A1)+ ;COPY PNLOC FROM THEPORT
MOVE.L (A0)+,(A1)+ ;COPY PNSIZE FROM THEPORT
MOVE (A0)+,(A1)+ ;COPY PENMODE
TST D1 ;IS IT A NEW GRAFPORT?
BMI.S GETNEW ;=>YES, GET NEW INFO
COPY2 MOVE.L (A0)+,(A1)+ ;COPY PNPAT FROM THEPORT
COPY1 MOVE.L (A0)+,(A1)+ ;ALL 8 BYTES
DONE MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
; SRC IS A NEW GRAFPORT, IF THE PATTERN WAS OLD-STYLE, COPY ITS DATA
; IF THE PATTERN WAS NEW, COPY THE HANDLE AND SET HIGH BIT OF PENMODE
GETNEW MOVE.L (A0),(A1) ;COPY PENPIXPAT HANDLE
MOVE.L (A0),A0 ;GET HANDLE
MOVE.L (A0),A0 ;POINT TO PENPIXPAT
TST PATTYPE(A0) ;IS IT A NEW PATTERN?
BEQ.S NOTNEW ;=>NO, COPY OLD DATA
OR #$8000,-2(A1) ;ELSE SET FLAG IN PENMODE
BRA.S DONE ;AND RETURN
NOTNEW MOVE.L PATDATA(A0),A0 ;GET HANDLE TO PATTERN DATA
MOVE.L (A0),A0 ;POINT TO PATTERN DATA
BRA.S COPY2 ;COPY THE PATTERN AND RETURN
SetPenState
;----------------------------------------------------------
;
; PROCEDURE SetPenState(pnState: PenState);
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE PORTBITS+ROWBYTES(A0),D1 ;KEEP ROWBYTES IN D0
LEA PNLOC(A0),A1 ;POINT TO PNLOC
MOVE.L 4(SP),A0 ;POINT TO VAR PNSTATE
MOVE.L (A0)+,(A1)+ ;COPY PNLOC FROM THEPORT
MOVE.L (A0)+,(A1)+ ;COPY PNSIZE FROM THEPORT
MOVE (A0)+,(A1) ;COPY PENMODE
AND #$7FFF,(A1)+ ;AND CLEAR HIGH BIT
TST D1 ;IS IT A PENPIXPAT?
BPL.S COPY2 ;=>NO, SET IT OLD WAY
; DESTINATION IS A COLOR PORT. MUST CHECK FOR OLD OR NEW PAT
@SETNEW TST -2(A0) ;IS IT A PENPIXPAT?
BPL.S @SETOLD ;=>NO, SET OLD PATTERN
MOVE.L (A0),-(SP) ;PUSH HANDLE
_PENPIXPAT ;AND SET PEN'S PIXPAT
BRA.S DONE ;AND RETURN
@SETOLD MOVE.L A0,-(SP) ;POINT TO PAT
_PENPAT ;AND SET IT
BRA.S DONE ;AND RETURN
GetPen PROC EXPORT
;----------------------------------------------------------
;
; 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
PenSize PROC EXPORT
;----------------------------------------------------------
;
; 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
PenMode PROC EXPORT
IMPORT 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
PenPat PROC EXPORT
IMPORT OLDPATTONEW
EXPORT PenNormal
;----------------------------------------------------------
;
; PROCEDURE PenPat(pat: Pattern);
; { set the pattern for line drawing }
;
MOVE.L 4(SP),A1 ;POINT TO INPUT PATTERN
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
SETPPAT TST PORTBITS+ROWBYTES(A0) ;IS IT A NEW GRAFPORT?
BMI.S NEWPPAT ;=>YES, INSTALL A COLOR PATTERN
LEA PNPAT(A0),A0 ;POINT TO PNPAT
MOVE.L (A1)+,(A0)+ ;COPY PATTERN INTO THEPORT
MOVE.L (A1)+,(A0)+ ;ALL 8 BYTES
DONE MOVE.L (SP)+,(SP) ;STRIP 4 BYTES
RTS ;AND RETURN
NEWPPAT MOVE.L A1,-(SP) ;PUSH THE PATTERN
PEA PNPIXPAT(A0) ;AND THE PEN PAT HANDLE
_OLDPATTONEW ;INSTALL THE PATTERN
BRA.S DONE ;AND RETURN
PenNormal
;----------------------------------------------------------
;
; PROCEDURE PenNormal;
; { restore all line drawing parameters to normal }
;
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
LEA BLACK(A0),A1 ;POINT TO BLACK PATTERN
MOVE.L THEPORT(A0),A0 ;GET CURRENT GRAFPORT
MOVE.L #$00010001,PNSIZE(A0) ;PEN SIZE:=1,1
MOVE #8,PNMODE(A0) ;PENMODE:=PATTERN COPY
MOVE.L (SP),-(SP) ;PUSH DUMMY PARAM
BRA.S SETPPAT ;PNPAT := BLACK
ENDPROC
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