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sys7.1-doc-wip/QuickDraw/Patches/QuickPolysMacIIPatch.a
Horst Beepmanh 33cd9271f4 SuperMarioProj.1994-02-09
2019-07-27 22:37:48 +08:00

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;
; File: QuickPolysMacIIPatch.a
;
; Contains: xxx put contents here (or delete the whole line) xxx
;
; Written by: xxx put name of writer here (or delete the whole line) xxx
;
; Copyright: © 1981-1990 by Apple Computer, Inc., all rights reserved.
;
; Change History (most recent first):
;
; <5> 9/19/90 SAM Fixed a typo in the last revision.
; <4> 9/18/90 SAM Making ShiftTBL have an even number of entries as to not
; generate an alignment assembly warning.
; <3> 7/20/90 gbm Change some identifiers, for a change of pace
; <2> 7/11/90 gbm nuke an asm warning or two
; <1.0> 11/19/89 BAL Changed name to prevent confusion between MacII patch version
; and ROM/32-Bit QD version.
; <1.0> 11/19/89 BAL renamed system 6.0 version to avoid conflicts with ROM/32-Bit QD
; version.
; <1.3> 4/17/89 CCH Unconditionalized fixed from 6.0.3.
; <1.2> 1/31/89 CCH Added BAL's quick routine for rectangular polygons from 6.0.3
; source.
; <•1.1> 11/16/88 CCH Updated to newest version.
; 12/2/87 AWC Macintosh II rom patch installed this date
;
; To Do:
;
;EASE$$$ READ ONLY COPY of file “QuickPolysMacIIPatch.a”
; 1.0 BAL 11/19/1989 Changed name to prevent confusion between MacII patch
; version and ROM/32-Bit QD version.
; END EASE MODIFICATION HISTORY
; 1.0 BAL 11/19/1989 renamed system 6.0 version to avoid conflicts with
; ROM/32-Bit QD version.
; END EASE MODIFICATION HISTORY
; 1.3 CCH 04/17/1989 Unconditionalized fixed from 6.0.3.
; 1.2 CCH 01/31/1989 Added BAL's quick routine for rectangular polygons from 6.0.3 source.
;•1.1 CCH 11/16/1988 Updated to newest version.
;END OF EASE COMMENTS
;
; File QuickPolysPatch.a
;
; Copyright Apple Computer, Inc. 1981-1988
;
; All Rights Reserved
;_______________________________________________________________________________________
; This code replaces StdPoly with a version that has two important features. It does
; not use QuickDraw regions, and so does not blow up. In addition, for screen sized
; polygons it performs about 4 times faster than QuickDraw polygons.
;_______________________________________________________________________________________
;
; modification history
;
; <02Dec87> AWC Macintosh II rom patch installed this date
; <24Mar88> PMAB440 AWC Fixed sorting problem to make QuickPolys match Classic QuickDraw;
; included QuickPolysEqu.a in QuickPolysPatch.a
; <26Mar88> PMAB444 AWC Fixed nil NewHandle bug in QuickPolys; refixed save A0 across _FixRatio
; <31Mar88> PMAB451 AWC Fixed a bug in PMAB440 above and saved registers across FixRatio
;
XDrawPoly PROC EXPORT ; make sure data structures are at the global level
ENDPROC
;-------------------------------------------------------------
;
; Definition of the VectorRec structure
;
YVector Equ 0
XVector Equ 2
YDelta Equ 4
XDelta Equ 6
VectorSize Equ 8
;-------------------------------------------------------------
;
; Definition of the EdgeRec structure
;
NextEdge Equ 0 ; pointer to next edge
PrevEdge Equ NextEdge+4 ; pointer to previous edge
XValue Equ PrevEdge+4 ; current x position (Fixed)
XSlope Equ XValue+4 ; slope of the line (Fixed)
LastY Equ XSlope+4 ; end of the edge
Sign Equ LastY+2 ; sign of the vector (+1 or -1)
EdgeRecSize Equ Sign+2 ; size of the EdgeRec structure (20)
;-------------------------------------------------------------
;
; PROCEDURE SortVectors(Vectors: Ptr; VCount: integer);
;
; SortVectors performs a non-recursive QuickSort on an array of
; vectors (y,x,dy,dx). The vectors are sorted first on y and second
; on x. The differential values are not examined. This code is
; a modified version of SortPoints, found in the QuickDraw ROM.
; The vectors are placed in increasing Y.X order. See the source
; reference "Algorithms + Data Structures = Programs, p. 80"
SortVectors PROC EXPORT
ParamSize Equ 6
Vectors Equ ParamSize+8-4
VCount Equ Vectors-2
VarSize Equ 0
Link A6,#VarSize ; no local variables
MoveM.L D3-D4/A2-A4,-(SP) ; save registers
Move.L Vectors(A6),A3 ; LeftPtr := start of point array
Move A3,D3 ; set up low bits for sort
And #7,D3 ; AWC - #3 => #7
MoveQ #0,D0 ; clear high word
Move VCount(A6),D0 ; get VCount
Ble.S GoHome ; do nothing if no vectors
Lsl.L #3,D0 ; AWC - #2 => #3; LineCount * 8 for bytes
Move.L A3,A4
Add.L D0,A4 ; add to DstStart
SubQ.L #8,A4 ; AWC - #4 => #8; RightPtr := DstEnd - 8
Move.L SP,D4 ; remember stack marker
MoveM.L A3/A4,-(SP) ; push LeftPtr and RightPtr
RePartition MoveM.L (SP)+,A3/A4 ; pop LeftPtr and RightPtr
Split Move.L A3,A1 ; IPtr := LeftPtr
Move.L A4,A2 ; JPtr := RightPtr
; Calculate MidPtr and MidPt
Move.L A3,D0 ; D0 := LeftPtr + RightPtr
Add.L A4,D0
RoxR.L #1,D0 ; divide by 2 for MidPtr
And #$FFF8,D0 ; AWC - #$FFFC => #$FFF8; truncate to multiple of 8 bytes
Or D3,D0 ; OR in low bits for vector boundary
Move.L D0,A0 ; put MidPtr into A0
Move XVector(A0),D1 ; D1 := MidPt.X
Move YVector(A0),D2 ; D2 := MidPt.Y
Bra.S IScan
; while IPtr^ < MidPt do IPtr := IPtr + 8
NextIPtr AddQ.L #8,A1 ; AWC - #4 => #8; bump IPtr to "right"
IScan Cmp YVector(A1),D2 ; is MidPt.Y > IPtr^.Y?
Bgt.S NextIPtr ; yes => continue bumping
Blt.S JScan ; MidPt.Y < IPtr^.Y? yes => done with IPtr
Cmp XVector(A1),D1 ; sort on X - is MidPt.X > IPtr^.X?
Bgt.S NextIPtr ; yes => continue bumping
Bra.S JScan ; go to loop start
; while JPtr^ > MidPt do JPtr := JPtr - 8
NextJPtr SubQ.L #8,A2 ; AWC - #4 => #8; decrement JPtr
JScan Cmp YVector(A2),D2 ; is JPtr^.Y > MidPt.Y?
Blt.S NextJPtr ; yes => look at the next JPtr
Bgt.S EndScan ; is JPtr^.Y < MidPt.Y? yes => this partition is done
Cmp XVector(A2),D1 ; is JPtr^.X > MidPt.X?
Blt.S NextJPtr ; yes => look at the next JPtr
; if IPtr <= JPtr then swap IPtr^ and JPtr^, and bump both pointers
EndScan Cmp.L A2,A1 ; is IPtr > JPtr?
Bgt.S NoSwap ; yes => all done
Move.L (A1),D0 ; D0 := IPtr^
Move.L (A2),(A1) ; IPtr^ := JPtr^
Move.L D0,(A2) ; JPtr^ := D0
Move.L 4(A1),D0 ; D0 := IPtr^.dy
Move.L 4(A2),4(A1) ; IPtr^.dy := JPtr^.dy
Move.L D0,4(A2) ; JPtr^.dy := D0
AddQ.L #8,A1 ; IPtr := IPtr + 8
SubQ.L #8,A2 ; JPtr := JPtr - 8
; repeat until this partitioning is complete, IPtr > JPtr
NoSwap CmpA.L A2,A1 ; is IPtr > JPtr
Bls.S IScan ; no => loop again
; if IPtr < RightPtr then stack request to sort right partition
CmpA.L A4,A1 ; is IPtr < RightPtr?
Bhs.S RightOkay ; yes => continue
MoveM.L A1/A4,-(SP) ; no => PushPartition(IPtr,RightPtr)
RightOkay Move.L A2,A4 ; RightPtr := JPtr
CmpA.L A4,A3 ; is LeftPtr >= RightPtr?
Blo.S Split ; no => partition again
CmpA.L D4,SP ; is stack empty yet?
Bne.S RePartition ; no => loop for more
GoHome MoveM.L (SP)+,D3-D4/A2-A4 ; restore registers
Unlk A6
Rtd #ParamSize
;---------------------------------------------------
;
; PROCEDURE PaintVector(Vector:VectorArray; VCount:integer; EoFill:boolean;
; VectRect:Rect; Mode:integer; Pat:Pattern);
;
PaintVector PROC EXPORT
ParamSize Equ 18
Vector Equ ParamSize+8-4
VCount Equ Vector-2
EoFill Equ VCount-2
VectRect Equ EoFill-4
Mode Equ VectRect-2
Pat Equ Mode-4
IMPORT RSect,ShieldCursor,ShowCursor,TrimRect
IMPORT PatExpand,ColorMap
IMPORT XorSlab,DrawSlab,SlabMode,FastSlabMode
IMPORT GetSeek,BitsToPix
;-------------------------------------------------
;
; A6 OFFSETS OF LOCAL VARIABLES AFTER LINK:
;
; STACK FRAME VARS USED BY SEEKMASK (CALLED BY STRETCHBITS, RGNBLT, DRAWARC, DRAWLINE)
;
RECTFLAG EQU -2 ;WORD
VERT EQU RECTFLAG-2 ;WORD
RGNBUFFER EQU VERT-4 ;LONG
BUFLEFT EQU RGNBUFFER-2 ;WORD
BUFSIZE EQU BUFLEFT-2 ;WORD
EXRTN EQU BUFSIZE-4 ;LONG
SEEKMASK EQU EXRTN-4 ;LONG
DSTMASKBUF EQU SEEKMASK-4 ;LONG
DSTMASKALIGN EQU DSTMASKBUF-4 ;LONG
STATEA EQU DSTMASKALIGN-RGNREC ;RGN STATE RECORD
STATEB EQU STATEA-RGNREC ;RGN STATE RECORD
STATEC EQU STATEB-RGNREC ;RGN STATE RECORD
; STACK FRAME VARS USED BY PATEXPAND
; (CALLED BY STRETCHBITS, RGNBLT, BITBLT, DRAWARC, DRAWLINE)
EXPAT EQU STATEC-4 ;LONG
PATVMASK EQU EXPAT-2 ;WORD (must follow expat)
PATHMASK EQU PATVMASK-2 ;WORD (must follow PATVMASK)
PATROW EQU PATHMASK-2 ;WORD (must follow PATHMASK)
PATHPOS EQU PATROW-2 ;WORD
PATVPOS EQU PATHPOS-2 ;WORD
LOCMODE EQU PATVPOS-2 ;WORD YES
PIXSRC EQU LOCMODE-1 ;BYTE YES
NEWPATTERN EQU LOCMODE-2 ;BYTE YES
LOCPAT EQU NEWPATTERN-4 ;LONG YES
FCOLOR EQU LOCPAT-4 ;LONG YES
BCOLOR EQU FCOLOR-4 ;LONG
DSTPIX EQU BCOLOR-(PMREC+CTREC+20) ;PIXMAP
DSTSHIFT EQU DSTPIX-2 ;WORD
; these shared stack frame vars are set up and used by the arithmetic drawing modes
weight EQU DSTSHIFT-6 ;RGB weight for averaging
pin EQU weight ;RGB used by max, min
notWeight EQU weight-6 ;RGB complement of weight (for average)
multiColor EQU notWeight-2 ;byte set if source contains nonblack/white colors
colorTable EQU multiColor-4 ;long pointer to color table
invColor EQU colorTable-4 ;long pointer to inverse color table
invSize EQU invColor-2 ;word resolution of inverse color table
rtShift EQU invSize-2 ;Word used by average how far to shift
transColor EQU rtShift-4 ;long copy of backcolor for transparent
hilitColor EQU transColor-4 ;long hilite color pixels
; Stack frame variables used in accord with DrawArc
MinRect Equ hilitColor-8
SAVESTK EQU MINRECT-4 ;LONG
MODECASE EQU SAVESTK-4 ;LONG
DSTLEFT EQU MODECASE-4 ;LONG
FASTFLAG EQU DSTLEFT-2 ;BYTE
TEMPRECT1 EQU FASTFLAG-8 ;RECT
CRSRFLAG EQU TEMPRECT1-2 ;SHORT
REALBOUNDS EQU CRSRFLAG-4 ;LONG
; Stack frame variables used only in DrawPoly
FreeList Equ RealBounds-4
StackLimit Equ FreeList-4
ActiveList Equ StackLimit-4
OldStacker Equ ActiveList-4
VarSize Equ OldStacker
IF &TYPE('Nil') = 'UNDEFINED' THEN
Nil: Equ 0
ENDIF
; A2 Edge
; A3 Vector
; A4 NextActive
;
; D3 VCount
; D4 CurrentY
; D5 LineFlag/WrapCount
; D6 LineMove/WrapMove
Link A6,#VarSize ; no local variables
MoveM.L D3-D7/A2-A4,-(SP) ; save registers
Move.L SP,OldStacker(A6) ; save the stack pointer
;;;;; Sicko code from DrawArc
CLR.L DSTMASKBUF(A6) ;ASSUME NO MASK
MOVE.L GRAFGLOBALS(A5),A0 ;POINT TO QUICKDRAW GLOBALS
MOVE.L THEPORT(A0),A4 ;GET CURRENT GRAFPORT
TST PNVIS(A4) ;IS PNVIS NEG ?
BLT GOHOME ;YES, QUIT
LEA EXPAT(A6),A0 ;DUMMY PATTERN USED IN ONESLAB
MOVE.L A0,(A0) ;POINT IT AT ITSELF
CLR PATVPOS(A6) ;INITIALIZE IN CASE NO PATTERN
CLR PATVMASK(A6) ;INITIALIZE IN CASE NO PATTERN
MOVE #1,PATROW(A6) ;INITIALIZE IN CASE NO PATTERN
;----------------------------------------------------------------
;
; MAKE SURE THE STACK IS ON A LONGWORD BOUNDARY (FOR FAST BUFFERS)
;
MOVE.L SP,D1 ;GET THE STACK POINTER
BTST #1,D1 ;WORD BOUNDARY?
BEQ.S STKOK ;=>NO, GOT LONG BOUNDARY
CLR.W -(SP) ;ELSE MAKE STACK LONG ALIGNED
STKOK
;----------------------------------------------------
;
; CONVERT PORTBITS TO A PIXMAP
; (A5 must contain global ptr)
;
LEA PORTBITS(A4),A1 ;PUSH POINTER TO PORTBITS
LEA DSTPIX(A6),A2 ;AND COPY INTO DSTPIX
_BitsToPix ;CONVERT BITMAP
MOVE.L D1,REALBOUNDS(A6) ;SAVE REAL DST BOUNDS.TOPLEFT
;----------------------------------------------------
;
; CONVERT PIXEL DEPTH TO SHIFT AMOUNT TO AVOID MULTIPLIES
;
LEA SHFTTBL,A0 ;POINT TO SHIFT TABLE
MOVE DSTPIX+PIXELSIZE(A6),D0 ;GET DST PIXEL SIZE
MOVEQ #0,D1 ;DEFAULT SHIFT = 0
MOVE.B 0(A0,D0),D1 ;GET SRC SHIFT
MOVE D1,DSTSHIFT(A6) ;AND SAVE DST SHIFT AMOUNT
;----------------------------------------------------------------
;
; SET UP NEWPATTERN TO INDICATE OLD OR NEW STYLE PATTERN
; ALSO SET UP LOCAL PATTERN POINTER, LOCPAT(A6)
;
MOVE.L PAT(A6),LOCPAT(A6) ;COPY PATTERN POINTER
MOVE MODE(A6),D0 ;get requested mode
BSET #3,D0 ;set the pattern bit in case the user forgot to
MOVEQ #$10,D1 ;1 past normal mode range
BTST #5,D0 ;arithmetic mode?
BEQ.S @noArith
CMP #$3A,D0 ;hilite?
BEQ.S @ok
MOVEQ #$30,D1 ;1 past arithmetic mode range
@noArith
CMP D1,D0 ;greater than defined range?
BGT GOHOME
@ok
MOVE D0,LOCMODE(A6) ;copy mode for colormap
TST PORTBITS+ROWBYTES(A4) ;IS THE DST OLD OR NEW?
SMI NEWPATTERN(A6) ;FLAG = TRUE IF NEW PATTERN
;----------------------------------------------------------------
;
; ADJUST MODE AND PATTERN IF COLOR FILTERING.
; (A5 must contain global ptr)
;
CLR.B PIXSRC(A6) ;NEVER SOURCE MODE
CLR.B multiColor(A6) ;use fg/bg color
_COLORMAP ;ALTER BY THECOLOR, THEFILTER
;---------------------------------------------------------
;
; GET CLIPRGN AND VISRGN HANDLES AND DE-REFERENCE THEM
;
MOVE.L CLIPRGN(A4),A2 ;GET CLIPRGN HANDLE
MOVE.L (A2),A2 ;GET CLIPRGN POINTER
MOVE.L VISRGN(A4),A3 ;GET VISRGN HANDLE
MOVE.L (A3),A3 ;GET VISRGN POINTER
;-----------------------------------------------------------------------
;
; CALC MINRECT, THE INTERSECTION OF DSTRECT, BITMAP BOUNDS,
; CLIPRGN BBOX, AND VISRGN BBOX. QUIT IF NO INTERSECTION.
;
MOVE.L VectRect(A6),-(SP) ;PUSH VectRect
PEA DSTPIX+BOUNDS(A6) ;PUSH BITMAP BOUNDS
PEA RGNBBOX(A2) ;PUSH CLIPRGN BBOX
PEA RGNBBOX(A3) ;PUSH VISRGN BBOX
MOVE #4,-(SP) ;PUSH NRECTS=4
PEA MINRECT(A6) ;PUSH DST ADDR
_RSECT ;CALC INTERSECTION
BEQ GOHOME ;QUIT IF NO INTERSECT
;--------------------------------------------------
;
; CHECK FOR BOTH VISRGN AND CLIPRGN RECTANGULAR
;
CLR.B FASTFLAG(A6) ;FASTFLAG := FALSE
CMP #10,RGNSIZE(A2) ;IS CLIPRGN RECTANGULAR ?
BNE.S FLAGOK ;NO, CONTINUE
CMP #10,RGNSIZE(A3) ;IS VISRGN RECTANGULAR ?
BEQ.S CKPAT ;YES, CONTINUE
;--------------------------------------------------
;
; If only visRgn is non-rectangular, then check if
; its intersection with minrect would be rectangular.
; IF TrimRect(visRgn,minRect) then treat as rectangular.
;
MOVE.L visRgn(A4),-(SP) ;push rgnHandle
PEA minRect(A6) ;push addr of minRect
_TrimRect ;call trimRect
BLT GOHOME ;quit if intersection empty
BGT.S FLAGOK ;continue if non-rectangular
;--------------------------------------------------
;
; CHECK FOR BLACK OR WHITE PATTERN
;
CKPAT BTST #5,LocMode+1(A6) ;an arithmetic mode?
BNE.S FlagOK ;skip fast case if so
MOVE.L LOCPAT(A6),A0 ;POINT TO PATTERN
MOVE.L (A0)+,D0 ;GET 1ST HALF OF PATTERN
CMP.L (A0)+,D0 ;IS IT SAME AS 2ND HALF ?
BNE.S FLAGOK ;NO, CONTINUE
NOT.L D0 ;IS PATTERN BLACK ?
BEQ.S YESFLAG ;YES, WE MADE IT
NOT.L D0 ;IS PATTERN WHITE ?
BNE.S FLAGOK ;NO, CONTINUE
EOR #4,LOCMODE(A6) ;YES, ALTER MODE AS IF BLACK
YESFLAG ST FASTFLAG(A6) ;REMEMBER RECT CLIPPED AND BLACK
;--------------------------------------------------
;
; fast case: map mode into black,xor,white, or do-nothing
;
MOVEQ #7,D0 ;GET 3 BIT MASK
AND LOCMODE(A6),D0 ;GET 3 BITS OF MODE
MOVE.B MODEMAP(D0),D0 ;MAP TO BLACK,XOR,WHITE,NOP
BMI GOHOME ;QUIT IF DO-NOTHING MODE
MOVE D0,LOCMODE(A6) ;UPDATE MODE
BRA.S FLAGOK ;AND CONTINUE
MODEMAP DC.B 0,0,1,2,2,255,255,255
FLAGOK
;----------------------------------------------------------------
;
; HIDE CURSOR IF CURSOR INTERSECTS MINRECT AND DST IS SCREEN.
;
MOVE.L THEGDEVICE,A0 ;GET CURRENT DEVICE
MOVE.L (A0),A0 ;POINT AT IT
MOVE.L GDPMAP(A0),A0 ;GET ITS PIXMAP
MOVE.L (A0),A0 ;POINT AT IT
MOVE.L BASEADDR(A0),D0 ;GET BASE OF SCREEN
CMP.L DSTPIX+BASEADDR(A6),D0 ;DRAWING TO SCREEN?
SEQ CRSRFLAG(A6) ;IF SO, SET FLAG
BNE.S NOTSCREEN ;=>NO
PEA MINRECT(A6) ;PUSH SHIELDRECT PARAMETER
MOVE.L REALBOUNDS(A6),-(SP) ;PUSH DELTA FOR GLOBAL
_SHIELDCURSOR ;HIDE CURSOR IF IT INTERSECTS
NOTSCREEN
;------------------------------------
;
; CALC BUFLEFT
;
MOVE DSTSHIFT(A6),D5 ;GET SHIFT FOR PIXEL DEPTH
MOVE MINRECT+LEFT(A6),D2 ;GET MINRECT LEFT
SUB DSTPIX+BOUNDS+LEFT(A6),D2 ;CONVERT TO GLOBAL COORDS
EXT.L D2 ;MAKE IT A LONG
LSL.L D5,D2 ;CONVERT PIXELS TO BITS
AND #$FFE0,D2 ;TRUNC TO MULT OF 32 BITS
MOVE.L D2,D0 ;GET FOR PATHPOS CALC
LSR.L #3,D0 ;CONVERT TO BYTES
MOVE D0,PATHPOS(A6) ;SAVE FOR BIG PATTERNS
LSR.L D5,D2 ;CONVERT BITS TO PIXELS
ADD DSTPIX+BOUNDS+LEFT(A6),D2 ;CONVERT BACK TO GLOBAL
MOVE D2,BUFLEFT(A6) ;SAVE AS BUFLEFT
;
; IF FASTFLAG, THEN SKIP REGION SETUP
;
TST.B FASTFLAG(A6) ;RECT CLIPPED AND BLACK ?
BNE SKIPSETUP ;YES, DON'T WASTE TIME WITH SETUP
;
; CALC BUFSIZE ( := (SCANSIZE + 1) * DEPTH -1 )
;
MOVE MINRECT+RIGHT(A6),D0 ;GET MINRECT RIGHT
SUB D2,D0 ;CALC MAXH-BUFLEFT
LSR #5,D0 ;DIV BY 32 FOR LONGS - 1
ADDQ #1,D0 ;MAKE IT ONE BASED
LSL D5,D0 ;CONVERT PIXELS TO BITS
SUBQ #1,D0 ;MAKE 0 BASED AGAIN
MOVE D0,BUFSIZE(A6) ;BUFSIZE = # LONGS - 1
;-------------------------------------------------------------------------
;
; ALLOCATE AND CLEAR A SCANLINE BUFFER FOR THE COMPOSITE MASK
;
CLRMASK CLR.L -(SP) ;ALLOCATE AND CLEAR ONE LONG
DBRA D0,CLRMASK ;LOOP TILL DONE
MOVE.L SP,RGNBUFFER(A6) ;REMEMBER WHERE RGNBUFFER IS
;-------------------------------------------------------------------------
;
; INIT STATE RECORDS AND ALLOCATE BUFFERS FOR EACH NON-RECTANGULAR REGION
;
CLR D5 ;INIT BOTH ARE RECT
MOVE #-32767,STATEA+THISV(A6) ;INIT REGION STATEA
MOVE #32767,STATEA+NEXTV(A6) ;TO HARMLESS IN CASE RECT
CMP #10,RGNSIZE(A2) ;IS CLIPRGN RECTANGULAR ?
BEQ.S ARECT ;YES, CONTINUE
ADD #2,D5 ;NO, SET ITS FLAG
MOVE.L A2,A0 ;POINT TO CLIPRGN
LEA STATEA(A6),A1 ;POINT TO STATE RECORD A
BSR.S INITONE ;INIT STATE, ALLOC BUFFER
ARECT
MOVE #-32767,STATEB+THISV(A6) ;INIT REGION STATEB
MOVE #32767,STATEB+NEXTV(A6) ;TO HARMLESS IN CASE RECT
CMP #10,RGNSIZE(A3) ;IS VISRGN RECTANGULAR ?
BEQ BRECT ;YES, CONTINUE
ADD #4,D5 ;NO, SET ITS FLAG
MOVE.L A3,A0 ;POINT TO VISRGN
LEA STATEB(A6),A1 ;POINT TO STATE RECORD B
PEA BRECT ;PUSH FAKE RETURN ADDR
INITONE MOVE MINRECT+LEFT(A6),D0 ;GET MINH
MOVE MINRECT+RIGHT(A6),D1 ;GET MAXH
MOVE BUFLEFT(A6),D2 ;GET BUFLEFT
; JMP INITRGN ;INIT STATE, ALLOC BUFFER
;INITRGN PROC EXPORT
;------------------------------------------------------
;
; INPUTS: A0: RGNPTR
; A1: STATE RECORD
; D0: MINH
; D1: MAXH
; D2: BUFLEFT
;
; OUTPUTS: ALL FIELDS OF STATE RECORD,
; SCANBUF ALLOCATED ON STACK
;
; CLOBBERS: D0,D1,A0
;
MOVE D0,MINH(A1) ;INSTALL MINH
MOVE D1,MAXH(A1) ;INSTALL MAXH
MOVE D2,LEFTH(A1) ;INSTALL LEFTH
MOVE.L A0,RGNPTR(A1) ;INSTALL RGNPTR
MOVE #-32767,THISV(A1) ;THISV := -32767
MOVE RGNBBOX+TOP(A0),NEXTV(A1) ;NEXTV := RGN BBOX TOP
LEA RGNDATA(A0),A0 ;POINT TO FIRST DATA
MOVE.L A0,DATAPTR(A1) ;INIT DATAPTR
MOVE.L (SP)+,A0 ;POP RETURN ADDR
SUB D2,D1 ;CALC BUFFER WIDTH IN DOTS
SUBQ #1,D1 ;MINUS ONE FOR EDGE CASES
LSR #5,D1 ;DIV BY 32 FOR #LONGS-1
MOVE D1,SCANSIZE(A1) ;SAVE SCANSIZE FOR LATER
CLRLOOP CLR.L -(SP) ;ALLOCATE AND CLEAR BUFFER
DBRA D1,CLRLOOP
MOVE.L SP,SCANBUF(A1) ;REMEMBER BUFFER START
JMP (A0) ;RETURN
SHFTTBL DC.B 0,0,1,0,2,0,0,0
DC.B 3,0,0,0,0,0,0,0
DC.B 4,0,0,0,0,0,0,0
DC.B 0,0,0,0,0,0,0,0
DC.B 5,0 ;<4> SAM -- Added the last 0 entry for alignment
BRECT
;--------------------------------------------------------------------
;
; IF BOTH REGIONS ARE RECTANGULAR, THEN DRAW MINRECT INTO MASK BUFFER
;
MOVE.W D5,RECTFLAG(A6) ;ARE ALL RGNS RECT ?
BNE.S NOTRECT ;NO, CONTNUE
MOVE.L RGNBUFFER(A6),A0 ;YES, POINT TO MASK BUFFER
MOVE MINRECT+LEFT(A6),D3 ;SET UP LEFT
SUB BUFLEFT(A6),D3 ;MAKE IT BUFFER RELATIVE
MOVE MINRECT+RIGHT(A6),D4 ;SET UP RIGHT
SUB BUFLEFT(A6),D4 ;MAKE IT BUFFER RELATIVE
MOVE DSTSHIFT(A6),D0 ;GET PIXEL TO BIT SHIFT
_XorSlab ;AND XOR BETWEEN THEM
;---------------------------------------------------------------------
;
; IF ONLY ONE REGION IS NON-RECTANGULAR, AND THE DEPTH = 1, PLAY THE
; REGION DIRECTLY INTO THE MASK BUFFER (NO EXPANSION OR COMPOSITION).
;
NOTRECT TST DSTSHIFT(A6) ;IS THE PIXELSIZE ONE?
BNE.S BOK ;=>NO, DON'T PLAY INTO MASK BUFFER
CMP #2,D5 ;IS RGNA THE ONLY NON-RECT ?
BNE.S AOK ;NO, CONTINUE
MOVE.L RGNBUFFER(A6),STATEA+SCANBUF(A6) ;YES, PLAY DIRECTLY INTO MASK
BRA.S BOK
AOK CMP #4,D5 ;IS RGNB THE ONLY NON-RECT ?
BNE.S BOK
MOVE.L RGNBUFFER(A6),STATEB+SCANBUF(A6)
BOK
;--------------------------------------------------------------------
;
; GET SEEK ROUTINE INTO SEEKMASK(A6)
; GET EXPAND ROUTINE INTO EXRTN(A6) FOR SEEK ROUTINE
;
MOVE DSTSHIFT(A6),-(SP) ;GET SHIFT FOR PIXEL DEPTH
_GETSEEK ;GET EXPAND ROUTINE INTO EXRTN(A6)
;AND SEEK ROUTINE INTO SEEKMASK(A6)
SKIPSETUP
;------------------------------------
;
; CALC STARTING DSTLEFT
;
MOVE MINRECT+TOP(A6),D1 ;GET MINRECT TOP
SUB DSTPIX+BOUNDS+TOP(A6),D1 ;CONVERT TO GLOBAL COORDS
MOVE DSTPIX+ROWBYTES(A6),D0 ;GET DST ROWBYTES
AND #RBMASK,D0 ;CLEAR FLAG BITS
MULU D0,D1 ;MULT BY DST ROWBYTES
ADD.L DSTPIX+BASEADDR(A6),D1 ;ADD START OF BITMAP
SUB DSTPIX+BOUNDS+LEFT(A6),D2 ;CONVERT BUFLEFT TO GLOBAL
MOVE DSTSHIFT(A6),D7 ;GET PIXEL TO BIT SHIFT AMOUNT
LSL D7,D2 ;CONVERT PIXELS TO BITS
LSR #3,D2 ;CONVERT BITS TO BYTES
EXT.L D2 ;CLR HI WORD
ADD.L D2,D1 ;ADD HORIZ BYTE OFFSET
MOVE.L D1,DSTLEFT(A6) ;SAVE AS DSTLEFT
;----------------------------------------------------
;
; MAKE ALL HORIZONTAL COORDINATES RELATIVE TO BUFFER
;
MOVE BUFLEFT(A6),D1 ;GET LEFT OF BUFFER
SUB D1,MINRECT+LEFT(A6)
SUB D1,MINRECT+RIGHT(A6)
;---------------------------------------------------
;
; SET UP CASE JUMP BASED ON MODE AND FASTFLAG
;
MOVE LOCMODE(A6),D2 ;GET (ALTERED) PEN MODE
TST.B FastFlag(A6) ;Rect clipped and black ?
BEQ.S @1 ;no, use slow drawslab loop
_FastSlabMode ;yes, get fast modeCase in A4
MOVE.L A4,MODECASE(A6) ;SAVE FOR LATER
BRA.S GOFORIT ;SKIP PATTERN STUFF
@1
;------------------------------------------------------------------
;
; ALLOCATE EXPANDED PATTERN BUFFER.
; EXPAND BYTE PATTERN TO PROPER DEPTH AND INIT PATTERN SELECTOR
;
CLR.L D7 ;SAY NOT INVERTED
MOVE LOCMODE(A6),D2 ;GET MODE
BCLR #2,D2 ;TEST AND CLR INVERT BIT
BEQ.S NOTINV ;SKIP IF NOT INVERTED
NOT.L D7 ;INVERTED; D7 GETS ALL 1'S
NOTINV _PATEXPAND ;EXPAND 8 BYTE PATTERN TO 16 LONGS
;SET UP PATROW,PATHMASK,PATVMASK
MOVE PATROW(A6),D1 ;BIG PATTERN USED?
BNE.S DONEW ;=>YES, GO USE IT
MOVEQ #$F,D0 ;ELSE 16 ROWS OF PATTERN
MOVEQ #4,D1 ;GET PATTERN ROWBYTES
MOVE D1,PATROW(A6) ;SET PATTERN ROWBYTES
MOVE #3,PATHMASK(A6) ;HORIZONTAL MASK FOR PATTERN
MOVE #$3F,PATVMASK(A6) ;VERTICAL MASK FOR PATTERN
BRA.S DOOLD ;=>GO GET VERTICAL OFFSET
; NEW PATTERN. SET STARTING VERT POSITION, SET FLAG.
DONEW MOVEQ #0,D0 ;CLEAR HIGH WORD
MOVE PATVMASK(A6),D0 ;GET VERTICAL MASK
ADDQ #1,D0 ;CONVERT TO COUNT
DIVU PATROW(A6),D0 ;DIVIDE BY ROWSIZE
SUBQ #1,D0 ;CONVERT TO ROW MASK
DOOLD AND MINRECT+TOP(A6),D0 ;GET TOP VERT LOCAL COORD
MULU D1,D0 ;CALC OFFSET INTO PATTERN
MOVE D0,PATVPOS(A6) ;SAVE AS PATVPOS
MOVE LOCMODE(A6),D2 ;GET (ALTERED) PEN MODE
_SlabMode ;GET SLOW MODECASE IN A4
;RELIES ON PATROW(A6)
MOVE.L A4,MODECASE(A6) ;SAVE FOR LATER
;;;;; End of sicko code from DrawArc
GoForIt Clr.L FreeList(A6) ; FreeList := nil;
Clr.L ActiveList(A6) ; ActiveList := nil;
_StackSpace ; how much stack is available
Move.L SP,D1 ; grab current stack
Sub.L D0,D1 ; calculate the maximum stack limit
Add.L #$100,D1 ; give us some spare room
Move.L D1,StackLimit(A6) ; save it
Move.L Vector(A6),A3 ; get pointer to VectorArray
Move (A3),D4 ; get CurrentY
Move D4,Vert(A6) ; set up for SeekMask
Move VCount(A6),D3 ; get number of edges
ActiveLoop MoveQ #Nil,A0 ; NewEdges := nil
MoveQ #Nil,A1 ; CurrentEdge := nil
; while (Vector < VCount) & (CurrentY = Vectors[Vector+1].YVector) do begin
Tst D3 ; any new edges left?
Beq NoNewEdges ; no => don't add any new
NewEdgeLoop Cmp (A3),D4 ; does CurrentY = NextY?
Bne NoNewEdges ; no => don't add any at the moment
Move.L FreeList(A6),A2 ; grab the FreeList
Move.L A2,D0 ; CmpA #Nil,A2; can we get an edge from the free list?
Bne.S FreeAndEasy ; yes => good enough
SubA.L #EdgeRecSize,SP ; make room for daddy
Move.L SP,A2 ; and create a new edge on the stack (gross)
CmpA.L StackLimit(A6),A2 ; have we bombed
Bge.S StackEdge ; no => keep trucking
Bra NoMorePoly ; yes => get out of here
FreeAndEasy Move.L (A2),FreeList(A6) ; FreeList := FreeList^.NextEdge
StackEdge MoveM.L A0-A1,-(SP) ; save registers across the FixRatio AWC.PMAB451
Clr.L -(SP) ; FixRatio result
Move.L YDelta(A3),-(SP) ; push numerator and denominator for FixRatio
_FixRatio ; calculate it
; The following few lines are excerpted from the PutLine code of Quickdraw so we can match
; the old polygon code precisely in terms of pixels rendered.
Move.L (SP)+,D2 ; D2 := slope
MoveM.L (SP)+,A0-A1 ; restore registers AWC.PMAB451
Move XVector(A3),D1 ; HiWord(D1) := XVector
Sub BufLeft(A6),D1 ; adjust to global coordinates
Swap D1 ; put the coordinate in the high word
Move #$8000,D1 ; LoWord(XVector) := 1/2
Move.L D2,D0 ; D0 := slope
Asr.L #1,D0 ; D0 := slope/2
Add.L D0,D1 ; XValue := XValue + Slope/2
Move.L #$10000,D0 ; D0 := 1.0000 fixed
Tst.L D2 ; is slope negative?
Bmi.S NegSlope ; yes => continue
Cmp.L D0,D2 ; is slope < 1.0000?
Bge.S SlopeOkay ; no => continue
Add.L D2,D1 ; XValue := XValue + Slope
Bra.S SlopeOkay ; continue
NegSlope Cmp.L #$FFFF0000,D2 ; is slope > -1.0000?
Bge.S SlopeOkay ; yes => continue
Add.L D0,D1 ; XValue := XValue + 1.0000
SlopeOkay Move.L D1,XValue(A2) ; XValue := D1
Move.L D2,XSlope(A2) ; XSlope := FixRatio(XVector,YVector)
MoveQ #1,D1 ; Sign := 1
Move YDelta(A3),D0 ; D0 := abs(YDelta)
Bpl.S SignOkay ; don't negate it
Neg D0 ; abs(YDelta)
Neg D1 ; Sign := -1
SignOkay Add D4,D0 ; D0 := CurrentY + abs(YDelta)
Move D0,LastY(A2) ; Edge^.LastY := CurrentY + abs(YDelta)
Tst.B EoFill(A6) ; are we EoFill'ing?
Beq.S Winder ; no => leave sign alone
MoveQ #0,D1 ; Sign := 0
Winder Move D1,Sign(A2) ; save Sign
Move.L A0,D0 ; CmpA.L #Nil,A0; is NewEdges nil? AWC.PMAB440
Bne.S InsertMid ; no => insert this new edge in the list AWC.PMAB440
Move.L A2,A0 ; NewEdges := Edge AWC.PMAB440
Move.L A2,A1 ; CurrentEdge := Edge AWC.PMAB440
Clr.L NextEdge(A2) ; end of list AWC.PMAB440
Clr.L PrevEdge(A2) ; beginning of list, too AWC.PMAB440
Bra.S InsertDone ; continue AWC.PMAB440
InsertMid Move.L A1,A4 ; InsertPt := CurrentEdge AWC.PMAB440
Move.L XValue(A2),D0 ; grab our compare value AWC.PMAB440
InsertNext Cmp.L XValue(A4),D0 ; D0 - InsertPt^.XValue AWC.PMAB440
Bge.S InsertIt ; if greater or equal, insert it AWC.PMAB440
Move.L PrevEdge(A4),A4 ; InsertPt := InsertPt^.NextEdge AWC.PMAB440
Move.L A4,D1 ; is the next edge nil? AWC.PMAB440
Bne.S InsertNext ; no => keep looking AWC.PMAB440
Move.L A0,NextEdge(A2) ; Edge^.NextEdge := NewEdges AWC.PMAB440
Move.L A2,PrevEdge(A0) ; NewEdges^.PrevEdge := Edge AWC.PMAB440
Clr.L PrevEdge(A2) ; Edge^.PrevEdge := nil AWC.PMAB440
Move.L A2,A0 ; NewEdges := Edge AWC.PMAB440
Bra.S InsertDone ; continue AWC.PMAB440
InsertIt CmpA.L A1,A4 ; at the end of the list? AWC.PMAB440
Beq.S InsertEnd ; yes => insert this edge at the end of list AWC.PMAB440
Move.L A4,PrevEdge(A2) ; Edge^.PrevEdge := InsertPt AWC.PMAB440
Move.L NextEdge(A4),D0 ; save InsertPt^.NextEdge AWC.PMAB440
Move.L A2,NextEdge(A4) ; InsertPt^.NextEdge := Edge AWC.PMAB451
Move.L D0,NextEdge(A2) ; Edge^.NextEdge := InsertPt^.NextEdge AWC.PMAB440
Move.L D0,A4 ; InsertPt := InsertPt^.NextEdge AWC.PMAB440
Move.L A2,PrevEdge(A4) ; InsertPt^.NextEdge^.PrevEdge := Edge AWC.PMAB440
Bra.S InsertDone ; continue AWC.PMAB440
InsertEnd Move.L A2,NextEdge(A1) ; CurrentEdge^.NextEdge := Edge AWC.PMAB440
Move.L A1,PrevEdge(A2) ; Edge^.PrevEdge := CurrentEdge AWC.PMAB440
Clr.L NextEdge(A2) ; Edge^.NextEdge := nil AWC.PMAB440
Move.L A2,A1 ; CurrentEdge := Edge AWC.PMAB440
InsertDone AddA.L #VectorSize,A3 ; bump A3 to the next vector AWC.PMAB440
SubQ #1,D3 ; VCount := VCount - 1
Bgt NewEdgeLoop ; check for more edges
; Merge the NewEdges with the ActiveList
NoNewEdges Move.L #Nil,A1 ; CurrentEdge := nil
Move.L ActiveList(A6),A4 ; NextActive := ActiveList
MergeLoop Move.L A4,D0 ; CmpA.L #Nil,A4; is NextActive nil?
Bne.S NextOrMerge ; no => merge edges
Move.L A0,D0 ; CmpA.L #Nil,A0; is NewEdges nil?
Beq.S Merged ; yes => don't merge edges
; NextActive = nil; NewEdges <> nil
Move.L A1,PrevEdge(A0) ; NewEdges^.PrevEdge := CurrentEdge; is CurrentEdge nil?
Bne.S C1 ; no => fix up CurrentEdge^.NextEdge
Move.L A0,ActiveList(A6) ; ActiveList := NewEdges
Bra.S Merged ; continue
C1 Move.L A0,NextEdge(A1) ; CurrentEdge^.NextEdge := NewEdges
Bra.S Merged ; continue
; else if NewEdges = nil { and therefore NextActive <> nil } then begin
NextOrMerge Move.L A0,D0 ; CmpA.L #Nil,A0; is NewEdges nil?
Bne.S MergeEdges ; no => merge edges
Move.L A1,PrevEdge(A4) ; NextActive^.PrevEdge := CurrentEdge; is CurrentEdge nil?
Bne.S C2 ; no => append NextActive to the list
Move.L A4,ActiveList(A6) ; ActiveList := NextActive
Bra.S Merged ; continue
C2 Move.L A4,NextEdge(A1) ; CurrentEdge^.NextEdge := NextActive
Bra.S Merged ; continue
; else { both are still active so } begin
MergeEdges Move.L XValue(A4),D0 ; get NextActive^.XValue
Cmp.L XValue(A0),D0 ; is NextActive^.XValue > NewEdges^.XValue?
Ble.S C3 ; no => select NextActive
Move.L A0,A2 ; Edge := NewEdges
Move.L NextEdge(A2),A0 ; NewEdges := Edge^.NextEdge
Bra.S C4 ; continue
C3 Move.L A4,A2 ; Edge := NextActive
Move.L NextEdge(A2),A4 ; NextActive := Edge^.NextEdge
C4 Move.L A1,PrevEdge(A2) ; Edge^.PrevEdge := CurrentEdge; is CurrentEdge nil?
Bne.S C5 ; no => patch CurrentEdge
Move.L A2,ActiveList(A6) ; ActiveList := Edge
Bra.S C6 ; continue
C5 Move.L A2,NextEdge(A1) ; CurrentEdge^.NextEdge := Edge
C6 Clr.L NextEdge(A2) ; Edge^.NextEdge := nil
Move.L A2,A1 ; CurrentEdge := Edge
Bra.S MergeLoop ; continue
Merged
;;;;; More DrawArc craziness
CMP MINRECT+TOP(A6),D4 ;IS CURRENT VERT < MINV ?
BLT.S NoMask ;YES, DON'T DRAW
; SEEK MASK TO THE CURRENT VERTICAL
TST.B FASTFLAG(A6) ;RECT CLIPPED AND BLACK ?
BNE.S NOMASK ;YES, DON'T BOTHER WITH MASK
Move D4,Vert(A6) ; SeekMask seems to want this...
JSR ([SEEKMASK,A6]) ;MAKE RGNBUFFER CURRENT
NoMask Move.L ActiveList(A6),A4 ; NextActive := ActiveList
MoveQ #0,D5 ; LineFlag := false or WrapCount := 0
SlabLoop Move.L A4,A1 ; CurrentEdge := NextActive
Move.L NextEdge(A1),A4 ; NextActive := CurrentEdge^.NextEdge
Cmp LastY(A1),D4 ; is LastY <= CurrentY?
Bge RemoveEdge ; yes => go remove the edge
Move Sign(A1),D0 ; grab the sign
Beq.S DoToggle1 ; if zero then EoFill; toggle the flag
Tst D5 ; is current wrapcount 0?
Bne.S NoWrapMove ; no => don't establish WrapMove
Move XValue(A1),D6 ; save wrapmove
NoWrapMove Add D0,D5 ; WrapCount += Sign; is it 0?
Bne.S BumpX ; no => don't draw a line
NoLineMove Move XValue(A1),D0 ; grab current value
Cmp D6,D0 ; is line XValue.HiWord > move XValue.HiWord?
Bgt.S DrawLine ; yes => draw a line
Bra.S BumpX ; continue
DoToggle1 Eor #1,D5 ; toggle D5
Beq.S NoLineMove ; yes => go draw the line
Move XValue(A1),D6 ; save line mvoe
Bra.S BumpX ; continue
DrawLine
CMP MINRECT+TOP(A6),D4 ;IS CURRENT VERT < MINV ?
Blt.S BumpX ;YES, DON'T DRAW
Move D6,D1 ; get start of slab
Move D0,D2 ; get end of slab
MoveM.L D3-D6/A1-A4,-(SP) ; save everything
MOVE PATVPOS(A6),D6 ;GET VERT POS IN PATTERN
LEA ([EXPAT,A6],D6),A0 ;GET pointer to THIS ROW'S PATTERN
MOVE.L (A0),D6 ;set up the pattern
MOVE.L DSTLEFT(A6),A1 ;INIT DSTPTR TO LEFT
MOVE.L RGNBUFFER(A6),A2 ;INIT MASKPTR TO LEFT
LEA MINRECT(A6),A3 ;POINT TO MINRECT
MOVE.L MODECASE(A6),A4 ;GET MODE CASE JUMP
MOVE DSTSHIFT(A6),D0 ;GET PIXEL TO BIT SHIFT AMOUNT
MOVE.L FCOLOR(A6),D4 ;PASS FCOLOR
MOVE.L BCOLOR(A6),D5 ;AND BACKCOLOR
_DrawSlab
MoveM.L (SP)+,D3-D6/A1-A4 ; restore everything
BumpX Move.L XValue(A1),D0 ; grab current XValue
Add.L XSlope(A1),D0 ; bump it to the next value
Move.L D0,XValue(A1) ; XValue := XValue + XSlope
Move.L PrevEdge(A1),A2 ; Edge := CurrentEdge^.PrevEdge
Move.L A2,D1 ; CmpA.L #Nil,A2; is Edge = nil?
Beq.S CheckEdge ; yes => sorting order is okay
Cmp.L XValue(A2),D0 ; is PrevEdge^.XValue <= CurrentEdge^.XValue?
Bge.S CheckEdge ; yes => sorting order is okay
Move.L NextEdge(A1),NextEdge(A2) ; PrevEdge^.NextEdge := CurrentEdge^.NextEdge; nil?
Beq.S NextIsNil ; yes => don't bother setting backlink
Move.L NextEdge(A1),A0 ; grab the next edge
Move.L A2,PrevEdge(A0) ; NextEdge^.PrevEdge := CurrentEdge^.PrevEdge
NextIsNil Move.L PrevEdge(A2),A2 ; Edge := Edge^.PrevEdge
Move.L A2,D1 ; CmpA.L #Nil,A2; is it nil?
Bne.S CheckCross ; no => check for crossing
Move.L ActiveList(A6),A2 ; get NextEdge
Move.L A2,NextEdge(A1) ; CurrentEdge^.NextEdge := ActiveList
Clr.L PrevEdge(A1) ; PrevEdge := nil
Move.L A1,PrevEdge(A2) ; NextEdge^.PrevEdge := CurrentEdge
Move.L A1,ActiveList(A6) ; ActiveList := CurrentEdge
Bra.S CheckEdge ; continue
CheckCross Cmp.L XValue(A2),D0 ; is Edge^.XValue <=CurrentEdge^.XValue?
Blt.S NextIsNil ; no => continue searching
Move.L NextEdge(A2),A0 ; grab NextEdge
Move.L A0,NextEdge(A1) ; CurrentEdge^.NextEdge := Edge^.NextEdge
Move.L A2,PrevEdge(A1) ; CurrentEdge^.PrevEdge := Edge
Move.L A1,PrevEdge(A0) ; CurrentEdge^.NextEdge^.PrevEdge := CurrentEdge
Move.L A1,NextEdge(A2) ; Edge^.NextEdge := CurrentEdge
Bra.S CheckEdge ; continue
RemoveEdge Move.L PrevEdge(A1),A0 ; grab PrevEdge
Move.L A0,D0 ; CmpA.L #Nil,A0; is PrevEdge nil?
Bne.S PrevNotNil ; no => remove from middle
Move.L NextEdge(A1),ActiveList(A6) ; ActiveList := CurrentEdge^.NextEdge
Bra.S PrevWasNil ; continue
PrevNotNil Move.L NextEdge(A1),NextEdge(A0) ; PrevEdge^.NextEdge := CurrentEdge^.NextEdge
PrevWasNil Beq.S NextWasNil ; if NextEdge is nil, don't patch back pointer
Move.L NextEdge(A1),A2 ; grab NextEdge
Move.L A0,PrevEdge(A2) ; NextEdge^.PrevEdge := CurrentEdge^.PrevEdge
NextWasNil Move.L FreeList(A6),NextEdge(A1) ; CurrentEdge^.NextEdge := FreeList
Move.L A1,FreeList(A6) ; FreeList := CurrentEdge
Move.L A0,A1 ; CurrentEdge := CurrentEdge^.PrevEdge
CheckEdge Move.L A4,D0 ; CmpA.L #Nil,A4; is NextActive nil?
Bne SlabLoop ; no => do another edge
CMP MINRECT+TOP(A6),D4 ;IS CURRENT VERT < MINV ?
Blt.S BumpY ;YES, DON'T DRAW
;-------------------------------------------------------------------
;
; BUMP DESTINATION VERTICALLY AND LOOP FOR ALL SCAN LINES
;
NEXTPAT MOVE PATVPOS(A6),D0 ;GET PATVPOS
ADD PATROW(A6),D0 ;BUMP TO NEXT SCAN
AND PATVMASK(A6),D0 ;WRAP AT END OF PATTERN
MOVE D0,PATVPOS(A6) ;SAVE PATVPOS
MOVE DSTPIX+ROWBYTES(A6),D0 ;GET DST ROWBYTES
AND #rbMask,D0 ;CLEAR OFF FLAG BITS
EXT.L D0 ;MAKE IT LONG
ADD.L D0,DSTLEFT(A6) ;BUMP DST TO NEXT ROW
BumpY AddQ #1,D4 ; CurrentY += 1
Move D4,Vert(A6) ; update param for SeekMask (twice?)
Cmp MinRect+Bottom(A6),D4 ; have we reached the bottom?
Bge.S NoMorePoly ; yes => shut down ahead of schedule
Tst.L ActiveList(A6) ; does the ActiveList contain edges?
Bne ActiveLoop ; yes => loop
Tst D3 ; any new edges left?
Bne ActiveLoop ; yes => loop
NoMorePoly Tst.B CrsrFlag(A6) ; is screen Dst?
Beq.S GoHome ; no => don't show cursor
_ShowCursor ; restore cursor
GoHome BSet #HiliteBit,HiliteMode ; reset hilite override, in case colormap was skipped
Move.L OldStacker(A6),SP ; clean up the free list and strip buffer
MoveM.L (SP)+,D3-D7/A2-A4 ; restore registers
Unlk A6 ; clean up
Move.L (SP)+,A0 ; get return address
AddA.L #Paramsize,SP ; clean up the parameters
Jmp (A0) ; go home
;---------------------------------------------------
;
; PROCEDURE DrawPoly(poly: PolyHandle; mode: integer; VAR pat: Pattern);
;
DrawPoly PROC EXPORT
ParamSize Equ 10
Poly Equ ParamSize+8-4
Mode Equ Poly-2
Pat Equ Mode-4
PolyRect Equ -8
VarSize Equ PolyRect
; <11Jul88> PMAB543 BAL/JDB Implemented fast case for rectangular filled polys.
ROMDrawRect Equ $1d3c2
move.l ([10,a7]),a0 ; pick up polyptr <Begin PMAB543 BAL/JDB>
move (a0)+,d0 ; pick up byte count
cmp #4*5+10,d0 ; quadrilateral?
bne.s @chk4pt ; no, take general case
move.l 8+4*4(a0),d1 ; pick up last pnt
cmp.l 8(a0),d1 ; cmpare with first pnt
bne.s @notRect ;
bra.s @4Pnts
@aRect dc.l 0,0 ; save room for rect
@chk4pt cmp #4*4+10,d0 ; quadrilateral?
bne.s @notRect ; no, take general case
@4Pnts moveq #2,d0 ; force to 4 points
addq #8,a0 ; bump past rect
lea 4(a0),a1 ; point to next point
@nxtPnt cmp (a0)+,(a1)+ ; cmp h's
seq d1 ; remember equality
cmp (a0)+,(a1)+ ; cmp v's
seq d2 ; remember equality
or.b d1,d2 ; compute h1=h2 | v1=v2
beq.s @notRect ; no, not rect
dbra d0,@nxtPnt
lea -12(a0),a1 ; point to first point
cmp (a0)+,(a1)+ ; cmp h's
seq d1 ; remember equality
cmp (a0)+,(a1)+ ; cmp v's
seq d2 ; remember equality
or.b d1,d2 ; compute h1=h2 | v1=v2
beq.s @notRect ; no, not rect
lea @aRect,a0 ; point to rect
move.l a0,10(a7) ; overwrite polyhandle with rect ptr
move.l -12(a1),(a0)+ ; save top left
move.l -8(a1),(a0) ; save bot rght
JMPROM ROMDrawRect ; go so incredibly blindingly fast <End PMAB543 BAL/JDB>
@notRect
Link A6,#VarSize ; no local variables
MoveM.L D3-D5/A2,-(SP) ; save registers
Move.L GrafGlobals(A5),A0 ; point to QuickDraw globals
Move.L ThePort(A0),A0 ; get current port
Tst PnVis(A0) ; is PnVis neg ?
Bmi GoHome ; yes, quit AWC.PMAB444
Move.L Poly(A6),A0 ; get the poly handle
Move.L A0,D0 ; CmpA.L #Nil,A0; is it real?
Beq GoHome ; no => punt AWC.PMAB444
_HLock ; lock it down
Move.L (A0),A0 ; dereference poly
Move.L 2(A0),PolyRect(A6) ; move Top.Left
Move.L 6(A0),PolyRect+4(A6) ; move Bottom.Right
Move (A0),D4 ; get the length of the data
Sub #10,D4 ; remove the length word and the bounding box rect
Lsr #2,D4 ; D4 is temporarily the point count
MoveQ #0,D0 ; clear the high word
Move D4,D0 ; copy the number of points
AddQ.L #1,D0 ; bump it for the closing edge, maybe
Asl.L #3,D0 ; multiply by 8 bytes per edge
_NewHandle ; get a new handle
Tst D0 ; was there an error? AWC.PMAB444
Bne TempError ; yes => cleanup and get out of here AWC.PMAB444
Move.L A0,A2 ; copy it
_HLock ; lock it down
MoveQ #0,D3 ; clear VCount
Move.L Poly(A6),A1 ; get the handle again
Move.L (A1),A1 ; redereference it
AddA.L #polyPoints,A1 ; bump A1 to the first point
Move.L (A1)+,D5 ; get h and v for "old" position
Move D4,D2 ; copy loop counter to D2
SubQ.L #1,D2 ; remove the first point
Move.L (A2),A0 ; dereference the sorted edge list
Bra.S PolyEnd ; jump into the loop
PolyLoop Move.L D5,D4 ; copy current to old
Move.L (A1)+,D5 ; get next point
Move.L D4,D0 ; get the old point
Move.L D5,D1 ; copy the new point
Sub D0,D1 ; calculate XDelta
Swap D0 ; y1 is in D0.Low
Swap D1 ; y2 is in D1.Low
Sub D0,D1 ; calculate YDelta; does dy = 0?
Beq.S PolyEnd ; yes => ignore horizontal vectors
Bmi.S Upwards ; negative => save the new point
Move.L D4,(A0)+ ; save the old point
Bra.S IncVCount ; and continue
Upwards Move.L D5,(A0)+ ; save the new point
IncVCount AddQ #1,D3 ; bump VCount (D3)
Swap D1 ; XDelta:YDelta => YDelta:XDelta
Move.L D1,(A0)+ ; save YDelta:XDelta
PolyEnd DBra D2,PolyLoop ; loop for another poly point
Move.L D5,D4 ; save the new point to old
Move.L Poly(A6),A1 ; get poly handle again
Move.L (A1),A1 ; dereference it again
Move.L polyPoints(A1),D5 ; grab the first point again
Cmp.L D4,D5 ; did we end where we began?
Beq.S PolyDone ; yes => don't close it
Move.L D4,D0 ; get the old point
Move.L D5,D1 ; copy the new point
Sub D0,D1 ; calculate XDelta
Swap D0 ; y1 is in D0.Low
Swap D1 ; y2 is in D1.Low
Sub D0,D1 ; calculate YDelta; does dy = 0?
Beq.S PolyDone ; yes => ignore horizontal vectors
Bmi.S Upwards2 ; positive => use the old point
Move.L D4,(A0)+ ; save the old point
Bra.S IncVCount2 ; and continue
Upwards2 Move.L D5,(A0)+ ; save the new point
IncVCount2 AddQ #1,D3 ; bump VCount (D4)
Swap D1 ; XDelta:YDelta => YDelta:XDelta
Move.L D1,(A0)+ ; save deltas
PolyDone Move.L Poly(A6),A0 ; grab poly handle
_HUnlock ; unlock it
Move.L (A2),-(SP) ; push vectors pointer
Move D3,-(SP) ; push VCount
Jsr SortVectors ; sort them vectors
Move.L (A2),-(SP) ; push vectors pointer
Move D3,-(SP) ; push VCount
; Tst.B WnFill(A6) ; are we winding-number filling?
; Seq -(SP) ; push (not WnFill)
St -(SP) ; push EoFill
Pea PolyRect(A6) ; push rect
Move Mode(A6),-(SP) ; repush mode
Move.L Pat(A6),-(SP) ; repush pat
Jsr PaintVector ; go paint it
Move.L A2,A0 ; grab vectors handle
_HUnlock ; unlock it
Move.L A2,A0 ; grab it again
_DisposHandle ; dump it
MoveQ #0,D0 ; no error
Bra.S GoHome ; continue AWC.PMAB444
TempError Move.L Poly(A6),A0 ; grab poly handle AWC.PMAB444
_HUnlock ; unlock it AWC.PMAB444
GoHome MoveM.L (SP)+,D3-D5/A2 ; restore registers AWC.PMAB444
Unlk A6 ; clean up
Move.L (SP)+,A0 ; get return address
AddA.L #Paramsize,SP ; clean up the parameters
Jmp (A0) ; go home
;---------------------------------------------------
;
; PROCEDURE StdPoly(verb: GrafVerb; poly: PolyHandle);
;
myStdPoly PROC EXPORT
IMPORT PushVerb,RSect,DrawPoly
CheckPic EQU $20EF2 ; <PB302>
PutPicVerb EQU $20904 ; <PB302>
DPutPicOp EQU $20884 ; <PB302>
PutPicRgn Equ $208B8
GetRect Equ $213B2
FrPoly Equ $21594
PARAMSIZE EQU 6
VERB EQU PARAMSIZE+8-2 ;GRAFVERB
POLY EQU VERB-4 ;LONG, PolyHandle
MINRECT EQU -8 ;RECT
VARSIZE EQU MINRECT ;TOTAL BYTES OF LOCALS
LINK A6,#VARSIZE ;ALLOCATE STACK FRAME
MOVEM.L D5-D7/A2-A4,-(SP) ;SAVE REGS
MOVEQ #0,D7 ; clear lo word of reg for add later <PB279/DAF>
MOVE.B VERB(A6),D7 ;GET VERB
JSRROM CheckPic ;SET UP A4,A3 AND CHECK PICSAVE
BLE.S NOTPIC ;BRANCH IF NOT PICSAVE
MOVE.B D7,-(SP)
JSRROM PutPicVerb ;PUT ADDIONAL PARAMS TO THEPIC
MOVEQ #$70,D0 ;PUT POLYNOUN IN HI NIBBLE
ADD D7,D0 ;PUT VERB IN LO NIBBLE
JSRROM DPutPicOp ;PUT OPCODE TO THEPIC
MOVE.L POLY(A6),-(SP) ;PUSH POLYHANDLE
JSRROM PutPicRgn ;TREAT SAME AS A REGION
; CALL STANDARD LOOP TO DRAW TO ALL DEVICES
NOTPIC PEA StdDraw ;PUSH ADDRESS OF DRAW ROUTINE
PEAROM GetRect ;PUSH ADDRESS OF RECT ROUTINE
_StdDevLoop ;DRAW TO ALL DEVICES
GOHOME MOVEM.L (SP)+,D5-D7/A2-A4 ;RESTORE REGS
UNLINK PARAMSIZE,'STDPOLY '
;---------------------------------------------------------------
;
; PROCEDURE StdDraw;
;
; DRAW THE OBJECT
;
StdDraw MOVE.L POLY(A6),A2 ;GET POLYHANDLE
TST.B D7 ;IS VERB FRAME ?
BNE.S NOTFR ;NO, CONTINUE
MOVE.L A2,-(SP) ;PUSH POLYHANDLE
JSRROM FrPoly ;FrPoly(poly);
BRA.S DONE ;AND QUIT
NOTFR MOVE.L (A2),A0 ;DE-REFERENCE POLYHANDLE
PEA POLYBBOX(A0) ;PUSH POLYBBOX
MOVE.L VISRGN(A3),A0 ;GET VISRGN HANDLE
MOVE.L (A0),A0 ;DE-REFERENCE HANDLE
PEA RGNBBOX(A0) ;PUSH VISRGN BBOX
MOVE.L CLIPRGN(A3),A0 ;GET CLIPRGN HANDLE
MOVE.L (A0),A0 ;DE-REFERENCE HANDLE
PEA RGNBBOX(A0) ;PUSH CLIPRGN BBOX
MOVE #3,-(SP) ;PUSH NRECTS = 3
PEA MINRECT(A6) ;PUT RESULT IN MINRECT
_RSECT ;CALC INTERSECTION
BEQ.S DONE ;QUIT IF NO INTERSECT
MOVE.L A2,-(SP) ;PUSH POLYHANDLE
_PushVerb ;PUSH MODE AND PATTERN
JSR DrawPoly ;DrawPoly(poly,mode,pat);
DONE RTS
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