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boot3/QuickDraw/SeekMask.a
Elliot Nunn 5b0f0cc134 Bring in CubeE sources 
Resource forks are included only for .rsrc files. These are DeRezzed into their data fork. 'ckid' resources, from the Projector VCS, are not included.

The Tools directory, containing mostly junk, is also excluded.
2017-12-26 10:02:57 +08:00

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;
; File: SeekMask.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.
;
; This file is used in these builds: Mac32 Bigbang Sys606
;
; Change History (most recent first):
;
; <4> 9/18/90 BG Removed <2>. 040s are behaving more reliably now.
; <3> 7/20/90 gbm Change some identifiers to avoid conflicts with interfaces
; <2> 6/28/90 BG Added EclipseNOPs to deal with flakey 040s.
; <¥1.6> 7/14/89 BAL For Aurora: Final CQD
; <1.5> 6/30/89 BAL Now looks at runBuf(a6) to determine whether to use run clipping
; <¥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
; 11/5/88 BAL Added transfer direction (RUNBUMP) to SeekMask interface so
; appropriate run mask could be generated.
; 10/1/88 BAL Added RUNRTN, rtn to form n-bit run mask from 1-bit scan mask.
; 9/22/88 BAL Consolidated initialization of region state records. Moved code
; here from Drawline, drawarc, rgnblt, and stretch. Obviated the
; need for combinations other than A, AB, and ABC.
; 9/18/88 BAL Altered to use common stack frame file 'Drawing Vars.a'
; 12/1/86 EHB Redid SeekMask routines to avoid JSR's to SeekRgn (at the
; expense of a bunch of extra code)
; 10/9/86 EHB Added support for masks
; 7/5/86 EHB Added routine GETSEEK to set up all seekRgn information
; 6/15/86 EHB Removed scanbuf := RGNBUFFER (done externally, not in loop)
; 6/13/86 EHB New today Broken out from Drawline, drawarc, rgnblt, stretch
; Modified to expand result according to depth
BLANKS ON
STRING ASIS
MACHINE MC68020
;------------------------------------------------------------------
;
; --> SEEKMASK.a
;
;------------------------------------------------------------------
;------------------------------------------------------------------
;
; REGION CLIPPING
;
; When region clipping is being done, the drawing routine calls a routine
; that seeks to the current scanline in all necessary regions, ANDs all the
; regions together (with a mask too, if necessary), and then expands that
; one-bit scanline to the current screen depth so that it can be used as a
; pixel mask.
;
; The drawing routine first calls GETSEEK which places the routine that will
; do all this into SEEKMASK(A6). (All drawing routines which call this routine
; must have the same stack frame as defined in StretchBits.)
;
; GETSEEK sets up two routines: SEEKMASK(A6) which is the routine that combines
; the appropriate number of regions together, and EXRTN(A6), which expands a
; scanline to the proper depth and is called by the routine in SEEKMASK(A6).
;
;
; APPLYING A MASK TO THE REGION
;
; If a mask is to be combined with the regions, then DSTMASKBUF(A6) is non-zero
; and points to the mask for the current scanline. The mask is one bit deep
; and has been stretched, if necessary to the same size as the destination.
; Note that although SeekRgn seeks to the proper scanline of the regions within
; this routine, the proper scanline of the mask must be maintained externally
; to this routine.
;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;
; RgnBlt and everyone else (stretch,drawline,drawarc) compute bufSize as: <C954> 08Nov87 BAL
;
; [ (minRect.right-minRect.left) div 32 + 1 ] * pixelsize - 1
;
; This will result in an excess of upto (pixelsize-1) longs to be accessed during the
; region masked drawing. Since region masks are created as long aligned 1-bit deep masks
; which are then expanded to the proper depth the RGNBUFFER on the stack must be the bulky
; size computed above (until seekMask is changed to be more intelligent) but the stackFrame
; variable bufSize which determines the width of the scanline actually written to can more
; accurately be computed as:
;
; [ (minRect.right-minRect.left) * pixelsize - 1 ] div 32
;
xGETSEEK PROC EXPORT
EXPORT GETSEEK,AllocRunBuf,gsRunTbl,gsExpTbl,gsSeekTbl
IMPORT SEEKRGN,SEEKUP,SEEKDOWN
IMPORT Table2,Table4
;-----------------------------------------------------------------------
;
&CurFile SETC 'SEEKMASK'
INCLUDE 'DrawingVars.a'
; Low stack space error exit routine
GetOutofTown
clr.l StackFree(a6) ;guarantee stretch won't come back
GetMoreStk
jmp ([goShow,a6]) ;go show the cursor and return
;-----------------------------------------------------------------------
;
; ALLOCATE A RUN BUFFER FOR RUN-MASK CLIPPING. <BAL 21Sep88>
; Requires DrawingVars stack frame for inputs
; Returns ptr to stack buffer in a0
; Called by GetSeek, ScaleBlt
;
; trashes: d0,d1,d2,a0
;
AllocRunBuf
move.l (sp)+,d2 ;get return address
moveq #0,d1 ;clear out high word
move.w BufSize(a6),d1 ;get longs in ScanBuf-1
addq.l #2,d1 ;get longs in ScanBuf+1
cmp.w #5,DstShift(a6) ;is dest 32 bits/pixel ?
beq.s @1 ;yes, size <= N/2 + 1
move.l d1,d0 ;no, compute size <= 3(N+1)/2
add.l d1,d1
add.l d0,d1
@1 lsr.l #1,d1
addq.l #3,d1 ;got long cnt, 2 for slop
SUB.L D1,STACKFREE(A6) ;IS THERE ENOUGH STACK?
bpl.s @stkOK
bsr.s GetMoreStk ;no, go look for more stack!
@stkOK
lsl.l #2,d1 ;convert to a byte count
sub.l d1,sp ;allocate the buffer
move.l sp,a0 ;return where RunBuf is
addq #4,a0 ;leave a long in front for hacking
jmp (za0,d2.l) ;go back
ALIGN Alignment
;-------------------------------------------------
;
; GetSeek(RgnHandle1, RgnHandle2, ..., HandleCount.L);
;
; SET UP ADDRESS OF SEEK ROUTINE IN SEEKMASK(A6)
; SET UP ADDRESS OF EXPAND ROUTINE IN EXRTN(A6)
;
; CLOBBERS: A0-A3,D0-D4
;
; A6 OFFSETS OF LOCAL VARIABLES AFTER LINK:
;
; LINK DONE BY CALLER (STRETCHBITS, RGNBLT, ScaleBlt, DRAWLINE, DRAWARC, QuickPolys)
;
;
GETSEEK
MOVE.L 4(SP),D3 ;GET COUNT OF RGN HANDLES
LEA 12(SP,D3*4),A3 ;POINT TO FIRST RGN PARAM
LEA STATEA(A6),A1 ;POINT AT FIRST STATE RECORD
CLR D4 ;INIT ALL RGNS RECT
;-----------------------------------------------------------------------
;
; ALLOCATE A RUN BUFFER FOR RUN-MASK CLIPPING. <BAL 21Sep88>
;
tst.l runBuf(a6) ;are we run clipping? <1.5> BAL
beq.s NxtRgn ;no, don't allocate run buffer <1.5> BAL
_AllocRunBuf ;go do it
move.l a0,RunBuf(A6) ;remember where RunBuf is
;----------------------------------------------------------------------
;
; ALLOCATE BUFFERS AND INIT STATE RECORDS FOR EACH NON-RECT REGION
;
NXTRGN
MOVEQ #10,D0
MOVE.L -(A3),A0 ;GET RGNHANDLE
MOVE.L (A0),A0 ;DE-REFERENCE IT
CMP RGNSIZE(A0),D0 ;IS RGN RECTANGULAR ?
BEQ.S ARECT ;YES, SKIP IT
CMP #2,D3 ;IS THIS THE USER RGN?
BEQ.S NOTRECT ;YES, DON'T TRIM
MOVE.L (A3),-(SP) ;PUSH REGION HANDLE
PEA MINRECT(A6) ;PUSH ADDR OF MINRECT
CLR.W -(SP) ;pass Trim = False
_TRIMRECT ;CALL TRIMRECT (trashes a0)
blt.s GetOutofTown ;=>INTERSECTION EMPTY, QUIT & SHOW CURSOR
BEQ.S ARECT ;YES, SKIP IT
MOVE.L (A3),A0 ;GET RGNHANDLE
MOVE.L (A0),A0 ;DE-REFERENCE IT FOR INITRGN
NOTRECT
ADDQ.W #1,D4 ;NO, SET UP FLAG
ADD.W D4,D4 ;SAVE FLAGS
MOVE MINRECT+RIGHT(A6),D1 ;GET MAXH
MOVE BUFLEFT(A6),D2 ;GET BUFLEFT
MOVEQ #0,D0 ;CLEAR HIGH WORD OF D3
MOVE D1,D0 ;GET RIGHT
SUB D2,D0 ;GET WIDTH IN DOTS
LSR #5,D0 ;CONVERT TO LONGS
SUB.L D0,STACKFREE(A6) ;IS THERE ENOUGH STACK?
bpl.s @stkOK
bsr.s GetMoreStk ;no, go look for more stack!
@stkOK
MOVE MINRECT+LEFT(A6),D0 ;GET MINH
_INITRGN ;INIT STATE, ALLOC BUFFER
SUB #RGNREC,A1 ;BUMP TO NEXT RGN STATE RECORD
ARECT
DBRA D3,NXTRGN ;LOOP FOR ALL ACTIVE REGIONS
;--------------------------------------------------------------------
;
; IF ALL REGIONS ARE RECTANGULAR, AND THERE IS NO MASK,
; THEN DRAW MINRECT INTO MASK BUFFER. IF THERE IS A MASK, THEN INIT
; STATE RECORD FOR REGION A, AND DRAW MINRECT THERE INSTEAD.
;
TST.L DSTMASKBUF(A6) ;IS THERE A MASK?
BEQ.S NOMASK
ADDQ #1,D4 ;ALTER RECTFLAG TO REFLECT MASK
MOVE.W D4,RECTFLAG(A6) ;SAVE FOR GETRTNS
CMP.W #1,D4 ;ARE ALL RGNS RECT?
BGT.S GETRTNS ;NO, ATLEAST ONE ACTIVE STATE REC
;A1 POINTS TO STATE RECORD A
;A0 POINTS TO A VALID RGN
MOVE MINRECT+RIGHT(A6),D1 ;GET MAXH
MOVE BUFLEFT(A6),D2 ;GET BUFLEFT
MOVEQ #0,D0 ;CLEAR HIGH WORD OF D3
MOVE D1,D0 ;GET RIGHT
SUB D2,D0 ;GET WIDTH IN DOTS
LSR #5,D0 ;CONVERT TO LONGS
SUB.L D0,STACKFREE(A6) ;IS THERE ENOUGH STACK?
bpl.s @stkOK
bsr.s GetMoreStk ;no, go look for more stack!
@stkOK
MOVE MINRECT+LEFT(A6),D0 ;GET MINH
_INITRGN ;INIT STATE, ALLOC BUFFER
MOVEQ #0,D0 ;PIXEL SHIFT FOR MASK = 0
MOVE.L STATEA+SCANBUF(A6),A0 ;POINT TO RECT BUFFER
BRA.S DORECT
NOMASK
MOVE DSTSHIFT(A6),D0 ;GET THE DST DEPTH
tst.l runBuf(a6) ;are we run clipping? <1.5> BAL
beq.s @shiftOK ;no, use dstShift <1.5> BAL
moveq #0,d0 ;yes, RGNBUFFER is 1 bit/pixel <1.5> BAL
@shiftOK
MOVE.W D4,RECTFLAG(A6) ;ARE ALL RGNS RECT ?
BNE.S NOTRRGN ;NO, CONTINUE
MOVE.L RGNBUFFER(A6),A0 ;POINT TO REGION BUFFER
DORECT 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
_XorSlab ;AND XOR BETWEEN THEM
BRA.S GETRTNS ;=>SKIP NEXT TEST
;---------------------------------------------------------------------
;
; IF ONLY ONE REGION IS NON-RECTANGULAR, AND THE DEPTH = 1, PLAY THE
; REGION DIRECTLY INTO THE MASK BUFFER (NO EXPANSION OR COMPOSITION).
;
NOTRRGN TST D0 ;IS DST PIXELSIZE ONE? <1.5> BAL
BNE.S USEEXP ;=>NO, DON'T PLAY INTO MASK BUFFER
CMP #2,D4 ;ONLY 1 NON-RECT RGN?
BNE.S GETRTNS ;NO, CONTINUE
MOVE.L RGNBUFFER(A6),STATEA+SCANBUF(A6) ;YES, PLAY DIRECTLY INTO MASK
BRA.S GETRTNS
;---------------------------------------------------------------------
;
; ATLEAST ONE NON-RECT REGION AND DEPTH > 1 SO MUST USE EXPAND ROUTINE
;
USEEXP OR #1,RECTFLAG(A6) ;FORCE USE OF EXRTN
;--------------------------------------------------------------------
;
; GET SEEK ROUTINE INTO SEEKMASK(A6)
; GET EXPAND ROUTINE INTO EXRTN(A6) FOR SEEK ROUTINE
;
GETRTNS
MOVE DSTSHIFT(A6),D0 ;GET SHIFT AMOUNT
move.l gsRunTblPtr,A0 ;GET ADDRESS OF ROUTINE TBL
add.l (a0,d0*4),A0 ;CALC ROUTINE BASED ON DEPTH
MOVE.L A0,RUNRTN(A6) ;RETURN RUN ROUTINE
tst.l runBuf(a6) ;are we run clipping? <1.5> BAL
beq.s @shiftOK ;no, use dstShift <1.5> BAL
moveq #0,d0 ;yes, RGNBUFFER is 1 bit/pixel <1.5> BAL
@shiftOK
SUB.L A0,A0 ;ASSUME NO EXPAND ROUTINE
SUB.L #8,A3 ;SKIP OVER LAST RGNHANDLE, COUNT
MOVE.L (A3),A1 ;GET RETURN ADDRESS
MOVE RECTFLAG(A6),D1 ;GET OFFSET TO SEEK ROUTINE
MOVE D0,D2 ;MAKE A COPY OF DSTSHIFT
OR D1,D2 ;ARE ALL RGNS RECT AND NO MASK AND 1 BIT DEEP?
BEQ.S GOTXRTN ;YES, NO EXRTN
move.l gsExpTblPtr,A0 ;GET ADDRESS OF ROUTINE TBL
add.l (a0,d0*4),A0 ;PASS BACK OFFSET TO THE ROUTINE
GOTXRTN MOVE.L A0,EXRTN(A6) ;RETURN ADDRESS OF EXPAND ROUTINE
move.l gsSeekTblPtr,A0 ;GET TBL FOR SEEK ROUTINES
cmp.w #7,d1
ble.s @modeOK
sub.w #10,d1 ;fold the entries for a smaller tbl
@modeOK add.l (a0,D1*4),A0 ;ADD OFFSET TO ROUTINE
MOVE.L A0,SEEKMASK(A6) ;RETURN SEEK ROUTINE
JMP (A1) ;AND RETURN
ALIGN 4
;-------------------------------------------------
;
; ROUTINES TO CONVERT A 1-BIT SCANLINE MASK TO
; A RUN MASK FOR THE CURRENT DEPTH
; Runs are computed for either forward or reverse blitting
;
gsRunTbl DC.L RUN1-gsRunTbl,RUN2-gsRunTbl,RUN4-gsRunTbl
DC.L RUN8-gsRunTbl,RUN16-gsRunTbl,RUN32-gsRunTbl
;-------------------------------------------------
;
; ROUTINES TO EXPAND A SCANLINE TO THE CURRENT DEPTH
;
gsExpTbl DC.L SINGLE-gsExpTbl,DOUBLE-gsExpTbl,QUAD-gsExpTbl
DC.L EIGHT-gsExpTbl,SIXTEEN-gsExpTbl,THRTWO-gsExpTbl
;-------------------------------------------------
;
; ROUTINES TO SEEK TO THE CURRENT SCANLINE OF ONE, TWO, OR THREE REGIONS,
; APPLY A MASK TO THAT SCANLINE, IF NECESSARY, AND THEN CALL THE ROUTINE
; IN EXRTN(A6) TO EXPAND TO THE CURRENT DEPTH.
;
gsSeekTbl DC.L SEEKOK-gsSeekTbl ; IF RECT RGN, NO MASK
DC.L RECTMASK-gsSeekTbl ; IF RECT RGN, MASK
DC.L A-gsSeekTbl
DC.L AX-gsSeekTbl
DC.L ABC-gsSeekTbl; B-gsSeekTbl
DC.L ABC-gsSeekTbl; BX-gsSeekTbl
DC.L AB-gsSeekTbl
DC.L AB-gsSeekTbl
; DC.L 0; C-gsSeekTbl
; DC.L 0; CX-gsSeekTbl
; DC.L 0; AC-gsSeekTbl
; DC.L 0; AC-gsSeekTbl
; DC.L 0; BC-gsSeekTbl
; DC.L 0; BC-gsSeekTbl
; DC.L ABC-gsSeekTbl
; DC.L ABC-gsSeekTbl
;--------------------------------------------------------------------
;
; REGION IS RECTANGULAR (ALREADY DRAWN INTO STATEA+SCANBUF)
; Return a large scancount in d2 so that seekmask is not called again.
;
SEEKOK move.w #$7fff,d2 ;return scan count = ° <1.5> BAL
RTS
ALIGN Alignment
;--------------------------------------------------------------------
;
; REGION IS RECTANGULAR (ALREADY DRAWN INTO STATEA+SCANBUF) BUT THERE IS A MASK
; SO WE MUST COMBINE REGION WITH MASK AND EXPAND INTO RGNBUFFER.
;
RECTMASK MOVEM.L D3-D5/A4-A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L STATEA+SCANBUF(A6),A1 ;POINT AT THE BUFFER
MOVE.L DSTMASKBUF(A6),D0 ;POINT AT THE MASK
MOVE STATEA+SCANSIZE(A6),D1 ;GET SIZE OF MASK IN LONGS
MOVE.L DSTMASKALIGN(A6),D5 ;GET ALIGNMENT
MOVE.L RGNBUFFER(A6),A0 ;EXPAND INTO RGNBUFFER
MOVE.L EXRTN(A6),A4 ;GET EXPAND ROUTINE
LEA RETRECTM,A5 ;GET RETURN ADDRESS FOR LOOP
MOVE.L D0,A6 ;GET MASK BUFFER
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
RECTMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A1)+,D0 ;GET RECTANGULAR REGION
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETRECTM DBRA D1,RECTMLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D3-D5/A4-A6 ;RESTORE WORK REGISTERS
RDONE moveq #1,d2 ;return scan count = 1
RTS
ALIGN Alignment
;--------------------------------------------------------------------
;
; ONLY REGION A IS NON-RECTANGULAR. UPDATE IT AND USE IT AS THE MASK
;
; IF DEPTH = 1 THEN PLAY DIRECTLY INTO RGNBUFFER, ELSE PLAY INTO SCANBUF
; AND EXPAND INTO RGNBUFFER.
;
A LEA STATEA(A6),A1 ;POINT TO OUR STATE RECORD
MOVE VERT(A6),D0 ;GET VERT COORD
JMP SEEKRGN ;=>PLAY DIRECTLY INTO RGNBUFFER
;AND RETURN
AX MOVE VERT(A6),D0 ;GET VERT COORD
CMP STATEA+NEXTV(A6),D0 ;IS DESIRED VERT >= NEXTV ?
BGE.S AXDOWN ;YES, BUMP DOWNWARD
CMP STATEA+THISV(A6),D0 ;IS DESIRED VERT < CURRENT VERT ?
BLT.S AXUP ;YES, BUMP UPWARD
TST.L DSTMASKBUF(A6) ;IS THERE A MASK?
BEQ.S RDONE ;=>NO, NO CHANGE IN REGION
AXCHG MOVE.L STATEA+SCANBUF(A6),A1 ;ELSE GET THE BUFFER
MOVE STATEA+SCANSIZE(A6),D1 ;GET THE BUFFER SIZE
BRA.S CPY1BUF ;AND EXPAND INTO RGNBUFFER
AXDOWN LEA STATEA(A6),A1 ;POINT TO PROPER STATE RECORD
JSR SEEKDOWN ;SEEK DOWNWARD
BRA.S AXCHG ;=>GO EXPAND THE BUFFER
AXUP LEA STATEA(A6),A1 ;POINT TO PROPER STATE RECORD
JSR SEEKUP ;SEEK UPWARD
BRA.S AXCHG ;AND CONTINUE
CPY1BUF MOVE.L DSTMASKBUF(A6),D0 ;IS THERE A MASK?
BNE.S CPY1MASK ;=>YES, APPLY MASK TO REGIONS
; EXPAND 1 REGION INTO REGION BUFFER
MOVEM.L D2-D4/A4-A5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RGNBUFFER(A6),A0 ;EXPAND INTO RGNBUFFER
MOVE.L EXRTN(A6),A4 ;GET EXPAND ROUTINE
LEA RETAX,A5 ;GET RETURN ADDRESS FOR LOOP
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
AXLOOP MOVE.L (A1)+,D0
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETAX DBRA D1,AXLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D2-D4/A4-A5 ;RESTORE WORK REGISTERS
RTS
; COMBINE 1 REGION AND MASK AND EXPAND INTO REGION BUFFER
CPY1MASK MOVEM.L D3-D5/A4-A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L RGNBUFFER(A6),A0 ;EXPAND INTO RGNBUFFER
MOVE.L EXRTN(A6),A4 ;GET EXPAND ROUTINE
LEA RETAXM,A5 ;GET RETURN ADDRESS FOR LOOP
MOVE.L DSTMASKALIGN(A6),D5 ;ALIGN MASK TO DST
MOVE.L D0,A6 ;GET MASK BUFFER
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
AXMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A1)+,D0 ;GET RECTANGULAR REGION
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETAXM DBRA D1,AXMLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D3-D5/A4-A6 ;RESTORE WORK REGISTERS
moveq #1,d2 ;mask->force scan count = 1
RTS
ALIGN Alignment
;-------------------------------------------------------------------
;
; REGIONS A AND B ARE NON-RECTANGULAR. UPDATE EACH,
; THEN FORM INTERSECTION IN THE MASK BUFFER.
;
AB MOVE VERT(A6),D0 ;GET VERT COORD
LEA STATEA(A6),A1 ;POINT TO PROPER STATE RECORD
bsr.s SeekAny ;make scanBuf current
MOVE D2,-(SP) ;REMEMBER IF RGN CHANGED
LEA STATEB(A6),A1 ;POINT TO PROPER STATE RECORD
bsr.s SeekAny ;make scanBuf current
move (sp)+,d1 ;get previous result
cmp d2,d1 ;get d2=min(d1,d2)
bgt.s @min1
move d1,d2
@min1
ABCHG MOVE.L STATEA+SCANBUF(A6),A2
MOVE.L STATEB+SCANBUF(A6),A1
MOVE STATEA+SCANSIZE(A6),D1 ;GET THE BUFFER SIZE
CPY2BUF MOVE.L RGNBUFFER(A6),A0 ;FORM INTERSECTION IN RGNBUFFER
MOVE.L EXRTN(A6),D0 ;GET EXPAND ROUTINE
BNE.S ABX ;=>NEED TO EXPAND
ABLOOP MOVE.L DSTMASKBUF(A6),D0 ;IS THERE A MASK?
BNE.S ABM ;=>YES, APPLY MASK TO REGIONS
; COMBINE TWO REGIONS WITHOUT EXPANDING
MOVE.L (A2)+,D0
AND.L (A1)+,D0
MOVE.L D0,(A0)+
DBRA D1,ABLOOP
ABDONE RTS
; COMBINE TWO REGIONS AND A MASK WITHOUT EXPANDING
ABM MOVEM.L D5/A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L DSTMASKALIGN(A6),D5 ;ALIGN MASK TO DST
MOVE.L D0,A6 ;GET MASK POINTER
ABMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A2)+,D0 ;GET FIRST REGION
AND.L (A1)+,D0 ;COMBINE WITH SECOND REGION
MOVE.L D0,(A0)+ ;AND PUT TO DST BUFFER
DBRA D1,ABMLOOP ;REPEAT FOR ALL LONGS
MOVEM.L (SP)+,D5/A6 ;RESTORE WORK REGISTERS
moveq #1,d2 ;mask->force scan count = 1
RTS
;-------------------------------------------------------------------
;
; Make scanBuf current for given vert (d0) and region state record (a1)
; May seek either up or down and returns count of valid scans for
; current direction in D2.
;
SeekAny CMP NEXTV(A1),D0 ;IS DESIRED VERT >= NEXTV ?
BGE SEEKDOWN ;YES, BUMP DOWNWARD
CMP THISV(A1),D0 ;IS DESIRED VERT < CURRENT VERT ?
BLT SEEKUP ;YES, BUMP UPWARD
move.w NEXTV(A1),D2 ;assume top to bottom
sub.w d0,d2 ;compute scan down count
tst.l DstRow(a6) ;seeking up or down?
bpl.s @ok ;d2 is OK
move.w d0,d2 ;
sub.w THISV(A1),D2 ;compute scan up count
addq.w #1,d2 ;
@ok rts
;-------------------------------------------------------------------
ABX MOVEM.L D2-D5/A4-A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L DSTMASKBUF(A6),D2 ;IS THERE A MASK?
BNE.S ABXM ;=>YES, APPLY MASK TO REGIONS
; COMBINE TWO REGIONS AND EXPAND TO PROPER DEPTH
MOVE.L D0,A4 ;GET EXPAND ROUTINE
LEA RETABX,A5 ;GET RETURN ADDRESS FOR LOOP
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
ABXLOOP MOVE.L (A2)+,D0
AND.L (A1)+,D0
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETABX DBRA D1,ABXLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D2-D5/A4-A6 ;RESTORE WORK REGISTERS
RTS
; COMBINE TWO REGIONS AND A MASK AND EXPAND TO PROPER DEPTH
ABXM MOVE.L D0,A4 ;GET EXPAND ROUTINE
LEA RETABXM,A5 ;GET RETURN ADDRESS FOR LOOP
MOVE.L DSTMASKALIGN(A6),D5 ;ALIGN MASK TO DST
MOVE.L D2,A6 ;GET ADDRESS OF MASK
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
ABXMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A2)+,D0
AND.L (A1)+,D0
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETABXM DBRA D1,ABXMLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D2-D5/A4-A6 ;RESTORE WORK REGISTERS
moveq #1,d2 ;mask->force scan count = 1
RTS
ALIGN Alignment
;-------------------------------------------------------------------
;
; REGIONS A, B AND C ARE ALL NON-RECTANGULAR. UPDATE EACH,
; THEN FORM INTERSECTION IN THE MASK BUFFER.
;
ABC MOVE VERT(A6),D0 ;GET VERT COORD
LEA STATEA(A6),A1 ;POINT TO PROPER STATE RECORD
bsr.s SeekAny ;make scanBuf current
MOVE D2,-(SP) ;REMEMBER IF RGN CHANGED
LEA STATEB(A6),A1 ;POINT TO PROPER STATE RECORD
bsr.s SeekAny ;make scanBuf current
MOVE D2,-(SP) ;REMEMBER IF RGN CHANGED
LEA STATEC(A6),A1 ;POINT TO PROPER STATE RECORD
bsr.s SeekAny ;make scanBuf current
move (sp)+,d1 ;get previous result
cmp d2,d1 ;get d2=min(d1,d2)
bgt.s @min1
move d1,d2
@min1 move (sp)+,d1 ;get previous result
cmp d2,d1 ;get d2=min(d1,d2)
bgt.s @min2
move d1,d2
@min2
ABCCHG MOVE.L STATEA+SCANBUF(A6),A3
MOVE.L STATEB+SCANBUF(A6),A2
MOVE.L STATEC+SCANBUF(A6),A1
MOVE.L RGNBUFFER(A6),A0
MOVE STATEC+SCANSIZE(A6),D1 ;GET THE BUFFER SIZE (ALL SAME SIZE)
MOVE.L EXRTN(A6),D0 ;GET EXPAND ROUTINE
BNE ABCX ;=>NEED TO EXPAND
MOVE.L DSTMASKBUF(A6),D0 ;IS THERE A MASK?
BNE.S ABCM ;=>YES, APPLY MASK
; COMBINE 3 REGIONS INTO REGION BUFFER WITHOUT EXPANDING
ABCLOOP MOVE.L (A3)+,D0
AND.L (A2)+,D0
AND.L (A1)+,D0
MOVE.L D0,(A0)+
DBRA D1,ABCLOOP
RTS
; COMBINE 3 REGIONS AND MASK INTO REGION BUFFER WITHOUT EXPANDING
ABCM MOVEM.L D5/A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L DSTMASKALIGN(A6),D5 ;ALIGN MASK TO DST
MOVE.L D0,A6 ;GET ADDRESS OF MASK
ABCMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A3)+,D0
AND.L (A2)+,D0
AND.L (A1)+,D0
MOVE.L D0,(A0)+ ;AND PUT TO REGION BUFFER
DBRA D1,ABCMLOOP
MOVEM.L (SP)+,D5/A6 ;RESTORE WORK REGISTERS
moveq #1,d2 ;mask->force scan count = 1
RTS ;AND RETURN
ABCX MOVEM.L D2-D5/A4-A6,-(SP) ;SAVE WORK REGISTERS
MOVE.L DSTMASKBUF(A6),D2 ;IS THERE A MASK?
BNE.S ABCXM ;=>YES, APPLY MASK
; COMBINE 3 REGIONS AND EXPAND
MOVE.L D0,A4 ;GET EXPAND ROUTINE
LEA RETABCX,A5 ;GET RETURN ADDRESS FOR LOOP
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
ABCXLOOP MOVE.L (A3)+,D0
AND.L (A2)+,D0
AND.L (A1)+,D0
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETABCX DBRA D1,ABCXLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D2-D5/A4-A6 ;RESTORE WORK REGISTERS
RTS
; COMBINE 3 REGIONS AND MASK AND EXPAND
ABCXM MOVE.L D0,A4 ;GET EXPAND ROUTINE
LEA RETABCXM,A5 ;GET RETURN ADDRESS FOR LOOP
MOVE.L DSTMASKALIGN(A6),D5 ;ALIGN MASK TO DST
MOVE.L D2,A6 ;GET ADDRESS OF MASK
MOVEQ #0,D2 ;SCANLOOPS WANT D2=0
ABCXMLOOP BFEXTU (A6){D5:0},D0 ;EXTRACT A LONG OF MASK
ADDQ #4,A6 ;BUMP TO NEXT MASK LONG
AND.L (A3)+,D0
AND.L (A2)+,D0
AND.L (A1)+,D0
JMP (A4) ;EXPAND DO INTO RGNBUFFER
RETABCXM DBRA D1,ABCXMLOOP ;LOOP FOR ALL LONGS IN SRC
MOVEM.L (SP)+,D2-D5/A4-A6 ;RESTORE WORK REGISTERS
moveq #1,d2 ;mask->force scan count = 1
RTS
;-----------------------------------------------
;
; SCALING ROUTINES CALLED TO EXPAND A MASK BUFFER
; FROM ONE BIT TO N-BITS DEEP. THESE ROUTINES
; EXPAND A SINGLE LONG AT A TIME.
;
; D0: SRC DATA A0: DSTPTR
; D1: LONGCOUNT A1: SRC1
; D2: SCRATCH A2: SRC2
; D3: BYTECNT/BITCNT A3: SRC3
; D4: SCRATCH A4: RTN ADDRESS
; D5: A5: RETURN ADDRESS
;
;-----------------------------------------------
ALIGN Alignment
;-----------------------------------------------
;
; SCALE UP BY ONE USING INSCRUTABLE LOGIC
;
SINGLE MOVE.L D0,(A0)+ ;WRITE OUT WORD
JMP (A5) ;AND RETURN
ALIGN Alignment
DOUBLE
;-----------------------------------------------
;
; SCALE UP BY TWO USING TABLE LOOKUP
;
; D2 SHOULD BE 0 ON ENTRY
;
MOVE.L A5,-(SP) ; Save A5
LEA Table2,A5 ; A5->byte to word double table
CLR D2 ; clear upper bits of D2
MOVE.B D0,D2 ; D2 = 4th byte src
MOVE (A5,D2*2),D4 ; D4.lo = 4th word result
SWAP D0 ; 3412
MOVE.B D0,D2 ; D2 = 2nd byte src
MOVE (A5,D2*2),D3 ; D3.lo = 2nd word result
LSR.L #8,D0 ; x341
MOVE.B D0,D2 ; D2 = 1st byte src
SWAP D3
MOVE (A5,D2*2),D3
SWAP D3 ; D3 = 1st,2nd word results
SWAP D0 ; 41x3
MOVE.B D0,D2 ; D2 = 3rd byte of src
SWAP D4
MOVE (A5,D2*2),D4
SWAP D4 ; D4 = 3rd,4th word results
MOVE.L D3,(A0)+
MOVE.L D4,(A0)+
MOVE.L (SP)+,A5
JMP (A5)
ALIGN Alignment
QUAD
;-----------------------------------------------
;
; SCALE UP BY FOUR USING TABLE LOOKUP
;
; D2 SHOULD BE 0 ON ENTRY
;
MOVEQ #3,D3 ;DO 4 BYTES OF SRC
@DOQUAD ROL.L #8,D0 ;GET NEXT BYTE OF SRC
MOVE.B D0,D2 ;MAKE AN EXTRA COPY
MOVE.L (TABLE4,PC,D2*4),(A0)+
DBRA D3,@DOQUAD ;=>QUAD NEXT BYTE
JMP (A5) ;AND RETURN
ALIGN Alignment
EIGHT
;-----------------------------------------------
;
; SCALE UP BY EIGHT USING TABLE LOOKUP
;
; D2 SHOULD BE 0 ON ENTRY
;
MOVEQ #3,D3 ;DO 4 BYTES OF SRC
@DOEIGHT ROL.L #8,D0 ;GET A BYTE OF SRC
MOVE.B D0,D2 ;MAKE AN EXTRA COPY
LSR #4,D2 ;CLEAR HI NIBBLE
MOVE.L (TABLE8,PC,D2*4),(A0)+ ;PUT FIRST LONG TO DST
MOVEQ #$F,D2 ;MASK FOR LO NIBBLE
AND D0,D2 ;CLEAR HI NIBBLE
MOVE.L (TABLE8,PC,D2*4),(A0)+ ;PUT SECOND LONG TO DST
DBRA D3,@DOEIGHT ;=>EIGHT NEXT BYTE
JMP (A5) ;AND RETURN
ALIGN Alignment
SIXTEEN
;-------------------------------------------------
;
; SCALE UP BY 16
;
MOVEQ #15,D3 ;16 OUTPUT LONGS
@SIXTENA ADD.L D0,D0 ;GET ONE BIT OF SRC
SUBX.L D2,D2 ;EXTEND THRU HI WORD
ADD.L D0,D0 ;GET ONE BIT OF SRC
SUBX.W D2,D2 ;EXTEND THRU SET LO WORD
MOVE.L D2,(A0)+ ;OUTPUT 1 RESULT
DBRA D3,@SIXTENA ;
JMP (A5) ;AND RETURN
ALIGN Alignment
THRTWO
;-----------------------------------------------
;
; SCALE UP BY 32
;
MOVEQ #31,D3 ;32 OUTPUT LONGS
@THRTY2 ADD.L D0,D0 ;GET ONE BIT OF SRC
SUBX.L D2,D2 ;EXTEND THRU LONG
MOVE.L D2,(A0)+ ;OUTPUT 1 RESULT
DBRA D3,@THRTY2 ;
JMP (A5) ;AND RETURN
;-----------------------------------------------
;
; RUN MASK ROUTINES CALLED TO ENCODE A 1-BIT SCANLINE MASK
; INTO A RUN MASK APPROPRIATE FOR THE DESTINATION DEPTH.
; THESE ROUTINES ARE CALLED ON A SCANLINE BASIS.
;
; D0: scratch A0: scratch
; D1: scratch A1: scratch
; D2: preserved A2: scratch
; D3: preserved A3: preserved
; D4: preserved A4: preserved
; D5: A5: preserved
;
; Clobbers: D0-D1/A0-A2
;
;-----------------------------------------------
ALIGN Alignment
;-----------------------------------------------
;
;
RUN1
move.l RGNBUFFER(a6),a0
MOVEM.L D1/D3-D6,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
moveq #-1,d1 ;get blit mask
moveq #1,d4 ;get bump size for blit
swap d4
MOVE.L (a0)+,d0 ;prefetch first region data long
move.w RUNBUMP(a6),d6 ;are we blitting forwards?
bpl.s @nxtRun ;yes, go ahead
moveq #0,d0
move.w d5,d0 ;copy bufSize
asl.l #2,d0 ;get mask byte width
add.l d0,a0 ;point at last long in RGNBUFFER
move.l d0,d3 ;force skip to right edge
MOVE.L -(a0),d0 ;re-fetch first region data long
add.w d6,a0 ;predecrement
bra.s @first1
@nxtRun moveq #0,d3 ;init blit/mask, skip cnt
@first1 tst.l d0
beq.s @cntSkip ;mask is all zeros
@chkBlt cmp.l d1,d0 ;is the mask all ones?
beq.s @cntBlit ;yes, go cnt repeats
move.l a2,a1 ;save ptr to blit/skip long
addq.w #4,a2 ;bump past instruction long
bra.s @cntMask
@mask1 MOVE.L (a0),d0 ;all 0's?
add.w d6,a0 ;bump forward/backward in region
beq.s @dumpMask ;yes, done with mask run
cmp.l d1,d0 ;all 1's?
beq.s @dumpMask ;yes, done with mask run
add.l d4,d3
@cntMask move.l d0,(a2)+ ;write out mask
dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1)
bra.s @endRun
@dumpMask bset #runMaskBit,d3
move.l d3,(a1) ;write out blit/skip
bra.s @nxtRun
@dumpBlit move.l d3,(a2)+ ;write out blit/skip
bra.s @nxtRun
@skip1 MOVE.L (a0),d0 ;get region data
add.w d6,a0 ;bump forward/backward in region
bne.s @chkBlt
@cntSkip add.w d6,d3 ;accumulate skip (±4)
dbra d5,@skip1
bra.s @endRun
@blit1 MOVE.L (a0),d0 ;get region data
add.w d6,a0 ;bump forward/backward in region
cmp.l d1,d0
bne.s @dumpBlit
add.l d4,d3
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
@endRun move.l d1,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D1/D3-D6 ;RESTORE WORK REGISTERS
RTS
ALIGN Alignment
;-----------------------------------------------
;
; Build a 2 bit run mask from a 1 bit scan mask
; for use when blitting Left to Right or Right to Left
;
;
RUN2
move.l RGNBUFFER(a6),a0
MOVEM.L D1-D7/A3-A5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
lea TABLE2,a4 ;point at doubling table
moveq #-1,d1 ;get blit mask
moveq #1,d4 ;get bump size for blit
swap d4
move.l d4,a5 ;put blit bump size in a5
moveq #$F,d4 ;put nibble mask in d4
moveq #0,d6 ;clear out high end
MOVE.w (a0)+,d0 ;prefetch first region data word
move.w RUNBUMP(a6),d2 ;are we blitting forwards?
move.w d2,a3 ;make a copy for skip bump
asr.w #1,d2 ;make into word bump
bpl.s @nxtRun ;yes, go ahead
@backwards
addq.w #2,d5 ;make BufSize 1 based
and.w #~1,d5 ;round up to mult of pixelsize
moveq #0,d0
move.w d5,d0 ;copy bufSize
add.l d0,d0 ;get mask byte width
add.l d0,a0 ;point at last long in RGNBUFFER
add.l d0,d0 ;scale for dst bump
move.l d0,d3 ;force bump to far right
MOVE.w -(a0),d0 ;fetch last region data word
subq.w #2,a0 ;predecrement
bra.s @first
@nxtRun moveq #0,d3 ;init blit/mask, skip cnt
tst.w d0
@first beq.s @cntSkip ;mask is all zeros
@chkBlt cmp.w d1,d0 ;is the mask all ones?
beq.s @cntBlit ;yes, go cnt repeats
move.l a2,a1 ;save ptr to blit/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @cntMask
@mask1 MOVE.w (a0),d0 ;all 0's?
add.w d2,a0 ;bump for/backward in region
beq.s @dumpMask ;yes, done with mask run
cmp.w d1,d0 ;all 1's?
beq.s @dumpMask ;yes, done with mask run
add.l a5,d3
@cntMask
MOVE.B D0,D6
MOVE (A4,D6*2),D7
SWAP D7
ROL.W #8,D0
MOVE.B D0,D6
MOVE (A4,D6*2),D7
SWAP D7
MOVE.L D7,(A2)+ ;WRITE OUT MASK
dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1)
bra.s @endRun
@dumpMask bset #runMaskBit,d3
move.l d3,(a1) ;write out blit/skip
bra.s @nxtRun
@dumpBlit move.l d3,(a2)+ ;write out blit/skip
bra.s @nxtRun
@skip1 MOVE.w (a0),d0 ;get region data
add.w d2,a0 ;bump for/backward in region
bne.s @chkBlt
@cntSkip add.w a3,d3 ;accumulate skip ±4
dbra d5,@skip1
bra.s @endRun
@blit1 MOVE.w (a0),d0 ;get region data
add.w d2,a0 ;bump for/backward in region
cmp.w d1,d0
bne.s @dumpBlit
add.l a5,d3
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
@endRun move.l d1,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D1-D7/A3-A5 ;RESTORE WORK REGISTERS
RTS
;-----------------------------------------------
ALIGN Alignment
RUN4
;-----------------------------------------------
;
; SCALE UP BY FOUR USING TABLE LOOKUP
;
;
move.l RGNBUFFER(a6),a0
MOVEM.L D1-D7/A3/A4,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
LEA TABLE4,A4 ;point to quad table
moveq #-1,d1 ;get blit mask
moveq #1,d4 ;get bump size for blit
swap d4
moveq #0,d6 ;clear out high end
MOVE.b (a0)+,d0 ;get region data
move.w RUNBUMP(a6),d2 ;are we blitting forwards?
move.w d2,a3 ;save for skip bump
asr.w #2,d2 ;make into byte bump
bpl.s @nxtRun ;yes, go ahead
@backwards
addq.w #4,d5 ;make BufSize 1 based
and.w #~3,d5 ;round up to mult of pixelsize
moveq #0,d0
move.w d5,d0 ;copy bufSize
add.l d0,a0 ;point at last long in RGNBUFFER
lsl.l #2,d0 ;scale for dst bump
move.l d0,d3 ;force bump to far right
MOVE.b -(a0),d0 ;fetch last region data word
subq.w #1,a0 ;predecrement
bra.s @first
@nxtRun moveq #0,d3 ;init blit/mask, skip cnt
tst.b d0
@first beq.s @cntSkip ;mask is all zeros
@chkBlt cmp.b d1,d0 ;is the mask all ones?
beq.s @cntBlit ;yes, go cnt repeats
move.l a2,a1 ;save ptr to blit/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @cntMask
@mask1 MOVE.b (a0),d0 ;all 0's?
add.w d2,a0 ;bump for/back-wards 1 byte
beq.s @dumpMask ;yes, done with mask run
cmp.b d1,d0 ;all 1's?
beq.s @dumpMask ;yes, done with mask run
add.l d4,d3
@cntMask
MOVE.B D0,D6 ;MAKE AN EXTRA COPY
MOVE.L (A4,D6*4),(A2)+
dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1)
bra.s @endRun
@dumpMask bset #runMaskBit,d3
move.l d3,(a1) ;write out blit/skip
bra.s @nxtRun
@dumpBlit move.l d3,(a2)+ ;write out blit/skip
bra.s @nxtRun
@skip1 MOVE.b (a0),d0 ;get region data
add.w d2,a0 ;bump for/back-wards 1 byte
bne.s @chkBlt
@cntSkip add.w a3,d3 ;accumulate skip bump (±4)
dbra d5,@skip1
bra.s @endRun
@blit1 MOVE.b (a0),d0 ;get region data
add.w d2,a0 ;bump for/back-wards 1 byte
cmp.b d1,d0
bne.s @dumpBlit
add.l d4,d3
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
@endRun move.l d1,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D1-D7/A3/A4 ;RESTORE WORK REGISTERS
RTS
;
;-----------------------------------------------
ALIGN Alignment
RUN8
tst.w RunBump(a6) ;forward?
bmi BackWards8 ;yes, go there
;fall thru
Forwards8
;-----------------------------------------------
;
; Build a 8 bit run mask from a 1 bit scan mask
; for use when blitting Left to Right
; -Consumes bytes and produces double longs
;
move.l RGNBUFFER(a6),a0
MOVEM.L D1-D6/A4,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
LEA TABLE8,A4 ;point to scale table
lsr.w #1,d5 ;get cnt of double longs-1
moveq #-1,d1 ;get blit mask
moveq #1*2,d4 ;get bump size for blit
swap d4
moveq #0,d6 ;clear out high end
move.l #$10000,d2 ;init blit/mask to 2-1
MOVE.b (a0)+,d0 ;get region data
@nxtRun move.l d2,d3 ;init blit/mask, skip cnt
tst.b d0
beq.s @cntSkip ;mask is all zeros
@chkBlt cmp.b d1,d0 ;is the mask all ones?
beq.s @cntBlit ;yes, go cnt repeats
move.l a2,a1 ;save ptr to blit/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @cntMask
@mask1 MOVE.b (a0)+,d0 ;all 0's?
beq.s @dumpMask ;yes, done with mask run
cmp.b d1,d0 ;all 1's?
beq.s @dumpMask ;yes, done with mask run
add.l d4,d3
@cntMask
MOVE.B D0,D6 ;MAKE AN EXTRA COPY
LSR #4,D6 ;SHIFT FOR TABLE INDEX
; MOVE.L (TABLE8,PC,D6*4),(A2)+ ;bigger and slower than below
MOVE.L (A4,D6*4),(A2)+ ;PUT FIRST LONG TO DST
MOVEQ #$0F,D6 ;MASK FOR LO NIBBLE
AND D0,D6 ;MAKE AN EXTRA COPY
MOVE.L (A4,D6*4),(A2)+ ;PUT SECOND LONG TO DST
dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1)
bra.s @endRun
@dumpMask bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
bra.s @nxtRun
@dumpBlit move.l d3,(a2)+ ;write out blit/skip
bra.s @nxtRun
@skip1 MOVE.b (a0)+,d0 ;get region data
bne.s @chkBlt
@cntSkip addq.w #8,d3 ;skip bump size is +8
dbra d5,@skip1
bra.s @endRun
@blit1 MOVE.b (a0)+,d0 ;get region data
cmp.b d1,d0
bne.s @dumpBlit
add.l d4,d3
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
@endRun move.l d1,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D1-D6/A4 ;RESTORE WORK REGISTERS
RTS
;-----------------------------------------------
ALIGN Alignment
BackWards8
;-----------------------------------------------
;
; Build a 8 bit run mask from a 1 bit scan mask
; for use when blitting RIGHT to LEFT
; -Consumes bytes and produces double longs
;
move.l RGNBUFFER(a6),a0
MOVEM.L D1-D6/A4,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
LEA TABLE8,A4 ;point to scale table
moveq #-1,d1 ;get blit mask
moveq #1*2,d4 ;get bump size for blit
swap d4
moveq #0,d6 ;clear out high end
move.l #$10000,d2 ;init blit/mask to 2-1
move.l d2,d3 ;init high word of instruction
add.w #8,d5
and.w #~7,d5 ;round up to mult of pixelsize
move.w d5,d3 ;copy bufSize
asr.w #1,d3 ;get mask byte width /8*4
add.w d3,a0 ;point at last long in RGNBUFFER
lsl.w #3,d3 ;force skip to right edge
subq.w #1,d5 ;make zero based
subq.w #4,d3 ;make zero based
lsr.w #1,d5 ;get cnt of double longs-1
MOVE.b -(a0),d0 ;get region data
bra.s @first
@nxtRun move.l d2,d3 ;init blit/mask, skip cnt
@first tst.b d0
beq.s @cntSkip ;mask is all zeros
@chkBlt cmp.b d1,d0 ;is the mask all ones?
beq.s @cntBlit ;yes, go cnt repeats
move.l a2,a1 ;save ptr to blit/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @cntMask
@mask1 MOVE.b -(a0),d0 ;all 0's?
beq.s @dumpMask ;yes, done with mask run
cmp.b d1,d0 ;all 1's?
beq.s @dumpMask ;yes, done with mask run
add.l d4,d3
@cntMask
MOVEQ #$0F,D6 ;MASK FOR LO NIBBLE
AND D0,D6 ;GET LO NIBBLE
MOVE.L (A4,D6*4),(A2)+ ;PUT SECOND LONG TO DST
MOVE.B D0,D6 ;MAKE AN EXTRA COPY
LSR #4,D6 ;SHIFT FOR TABLE INDEX
; MOVE.L (TABLE8,PC,D6*4),(A2)+ ;bigger and slower than below
MOVE.L (A4,D6*4),(A2)+ ;PUT FIRST LONG TO DST
dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1)
bra.s @endRun
@dumpMask bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
bra.s @nxtRun
@dumpBlit move.l d3,(a2)+ ;write out blit/skip
bra.s @nxtRun
@skip1 MOVE.b -(a0),d0 ;get region data
bne.s @chkBlt
@cntSkip subq.w #8,d3 ;skip bump size is -8
dbra d5,@skip1
bra.s @endRun
@blit1 MOVE.b -(a0),d0 ;get region data
cmp.b d1,d0
bne.s @dumpBlit
add.l d4,d3
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
@endRun move.l d1,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D1-D6/A4 ;RESTORE WORK REGISTERS
RTS
ALIGN 4
TABLE8 DC.L $00000000,$000000FF,$0000FF00,$0000FFFF
DC.L $00FF0000,$00FF00FF,$00FFFF00,$00FFFFFF
DC.L $FF000000,$FF0000FF,$FF00FF00,$FF00FFFF
DC.L $FFFF0000,$FFFF00FF,$FFFFFF00,$FFFFFFFF
ALIGN Alignment
Forwards16
;-----------------------------------------------
;
; Build a 16 bit run mask from a 1 bit scan mask
; for use when blitting Left to Right
;
;
move.l RGNBUFFER(a6),a0
MOVEM.L D3-D5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
moveq #1,d4 ;get bump size for blit
swap d4
moveq #1,d0 ;get 1 into high bit
ror.l #1,d0 ;to init data stream
moveq #0,d3 ;init blit/mask, skip cnt
@skip1 add.l d0,d0 ;get one bit of src
bcc.s @chkSkip ;br if 0
bne.s @BlitOrMask ;br if 1
move.l (a0)+,d0 ;else get next long of region data
addx.l d0,d0 ;shift src bit out, 1 bit in
bcs.s @BlitOrMask ;br if 1
@chkSkip add.l d0,d0 ;another 0?
bcc.s @cntSkip ;yes, its a skip
@first01 move.l a2,a1 ;save ptr to mask/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @dump01
@cntSkip addq.w #4,d3 ;bump skip by +4
dbra d5,@skip1
bra.s endRun16
@BlitOrMask add.l d0,d0 ;another 1?
bcs.s @goBlit ;yes, begin a blit run
@first10 move.l a2,a1 ;save ptr to mask/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @dump10
@dumpMaskS bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @cntSkip
@dumpMaskB bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @goBlit
@chkMask0 add.l d0,d0 ;another 0?
bcc.s @dumpMaskS ;yes, its a skip
add.l d4,d3
@dump01 move.l #$ffff,(a2)+ ;write out 01 mask
bra.s @nextMask
@mask1 add.l d0,d0 ;get one bit of src
bcc.s @chkMask0 ;br if 0
bne.s @chkMask1 ;br if 1
move.l (a0)+,d0 ;else get next long of region data
addx.l d0,d0 ;shift src bit out, 1 bit in
bcc.s @chkMask0 ;br if 0
@chkMask1 add.l d0,d0 ;another 1?
bcs.s @dumpMaskB ;yes, its a blit
add.l d4,d3
@dump10 move.l #$ffff0000,(a2)+ ;write out 10 mask
@nextMask dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
bra.s endRun16
@dumpBlitS move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @chkSkip
@dumpBlitM move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @first10
@blit1 add.l d0,d0 ;get one bit of src
bcc.s @dumpBlitS ;br if 0
bne.s @chkBlit ;br if 1
move.l (a0)+,d0 ;else get next long of region data
addx.l d0,d0 ;shift src bit out, 1 bit in
bcc.s @dumpBlitS ;br if 0
@chkBlit add.l d0,d0 ;another 1?
bcc.s @dumpBlitM ;no, its a mask
add.l d4,d3
@goBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
endRun16 moveq #-1,d3 ;get a long -1
move.l d3,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D3-D5 ;RESTORE WORK REGISTERS
RTS
;-----------------------------------------------
ALIGN Alignment
RUN16
lea Forwards16,a0 ;assume blitting left to right
move.l a0,RunRtn(a6) ;go there from now on
tst.w RunBump(a6) ;forward?
bpl.s Forwards16 ;yes, go there
lea BackWards16,a0 ;blitting right to left
move.l a0,RunRtn(a6) ;go there from now on
;fall thru
BackWards16
;-----------------------------------------------
;
; Build a 16 bit run mask from a 1 bit scan mask
; for use when blitting RIGHT to LEFT
;
move.l RGNBUFFER(a6),a0
MOVEM.L D3-D5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
add.w #16,d5
and.w #~15,d5 ;round up to mult of pixelsize
moveq #1,d4 ;get bump size for blit
swap d4
move.w d5,d3 ;copy bufSize
ext.l d3 ;clear out high end
asr.w #2,d3 ;get mask byte width /16*4
add.w d3,a0 ;point at last long in RGNBUFFER
lsl.w #4,d3 ;force skip to right edge
subq.w #1,d5 ;make zero based
subq.w #4,d3 ;make zero based
moveq #1,d0 ;get 1 to init data stream
@skip1 lsr.l #1,d0 ;get one bit of src
bcc.s @chkSkip ;br if 0
bne.s @BlitOrMask ;br if 1
move.l -(a0),d0 ;else get next long of region data
roxr.l #1,d0 ;shift src bit out, 1 bit in
bcs.s @BlitOrMask ;br if 1
@chkSkip lsr.l #1,d0 ;another 0?
bcc.s @cntSkip ;yes, its a skip
@first01 move.l a2,a1 ;save ptr to mask/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @dump01
@cntSkip subq.w #4,d3 ;bump skip by -4
dbra d5,@skip1
bra.s endRun16 ;use common exit
@BlitOrMask lsr.l #1,d0 ;another 1?
bcs.s @goBlit ;yes, begin a blit run
@first10 move.l a2,a1 ;save ptr to mask/skip long
addq.l #4,a2 ;bump past instruction long
bra.s @dump10
@dumpMaskS bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @cntSkip
@dumpMaskB bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @goBlit
@chkMask0 lsr.l #1,d0 ;another 0?
bcc.s @dumpMaskS ;yes, its a skip
add.l d4,d3
@dump01 move.l #$ffff0000,(a2)+ ;write out 01 mask
bra.s @nextMask
@mask1 lsr.l #1,d0 ;get one bit of src
bcc.s @chkMask0 ;br if 0
bne.s @chkMask1 ;br if 1
move.l -(a0),d0 ;else get next long of region data
roxr.l #1,d0 ;shift src bit out, 1 bit in
bcc.s @chkMask0 ;br if 0
@chkMask1 lsr.l #1,d0 ;another 1?
bcs.s @dumpMaskB ;yes, its a blit
add.l d4,d3
@dump10 move.l #$0000ffff,(a2)+ ;write out 10 mask
@nextMask dbra d5,@mask1
bset #runMaskBit,d3
move.l d3,(a1) ;write out mask/skip
bra.s endRun16 ;use common exit
@dumpBlitS move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @chkSkip
@dumpBlitM move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @first10
@blit1 lsr.l #1,d0 ;get one bit of src
bcc.s @dumpBlitS ;br if 0
bne.s @chkBlit ;br if 1
move.l -(a0),d0 ;else get next long of region data
roxr.l #1,d0 ;shift src bit out, 1 bit in
bcc.s @dumpBlitS ;br if 0
@chkBlit lsr.l #1,d0 ;another 1?
bcc.s @dumpBlitM ;no, its a mask
add.l d4,d3
@goBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
bra.s endRun16 ;use common exit
ALIGN Alignment
Forwards32
;-----------------------------------------------
;
; Build a 32 bit run mask from a 1 bit scan mask
; for use when blitting Left to Right
;
move.l RGNBUFFER(a6),a0
MOVEM.L D3-D5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
moveq #1,d4 ;get bump size for blit
swap d4
moveq #1,d0 ;get 1 into high bit
ror.l #1,d0 ;to init data stream
moveq #0,d3 ;init blit/mask, skip cnt
@skip1 add.l d0,d0 ;get one bit of src
bcc.s @cntSkip ;br if 0
bne.s @cntBlit ;br if 1
move.l (a0)+,d0 ;else get next long of region data
addx.l d0,d0 ;shift src bit out, 1 bit in
bcs.s @cntBlit ;br if 1
@cntSkip addq.w #4,d3 ;bump skip by +4
dbra d5,@skip1
bra.s endRun32
@goSkip move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @cntSkip
@blit1 add.l d0,d0 ;get one bit of src
bcc.s @goSkip ;br if 0
bne.s @goBlit ;br if 1
move.l (a0)+,d0 ;else get next long of region data
addx.l d0,d0 ;shift src bit out, 1 bit in
bcc.s @goSkip ;br if 1
@goBlit add.l d4,d3 ;bump blit count
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
endRun32 moveq #-1,d3 ;get a long -1
move.l d3,(a2) ;flag end of run data (-1L)
MOVEM.L (SP)+,D3-D5 ;RESTORE WORK REGISTERS
RTS
;-----------------------------------------------
ALIGN Alignment
RUN32
lea Forwards32,a0 ;assume blitting left to right
move.l a0,RunRtn(a6) ;go there from now on
tst.w RunBump(a6) ;forward?
bpl.s Forwards32 ;yes, go there
lea BackWards32,a0 ;blitting right to left
move.l a0,RunRtn(a6) ;go there from now on
;fall thru
BackWards32
;-----------------------------------------------
;
; Build a 32 bit run mask from a 1 bit scan mask
; for use when blitting RIGHT to LEFT
;
; This should be optimized to look at longs as fast case
;
move.l RGNBUFFER(a6),a0
MOVEM.L D3-D5,-(SP) ;SAVE WORK REGISTERS
MOVE.L RUNBUF(A6),A2 ;point to run encoded mask buffer
MOVE.W BUFSIZE(A6),D5 ;get dest longs-1
add.w #32,d5
and.w #~31,d5 ;round up to mult of pixelsize
moveq #1,d4 ;get bump size for blit
swap d4
move.w d5,d3 ;copy bufSize
ext.l d3 ;clear out high end
asr.w #3,d3 ;get mask byte width /32*4
add.w d3,a0 ;point at last long in RGNBUFFER
lsl.w #5,d3 ;force skip to right edge
subq.w #1,d5 ;make zero based
subq.w #4,d3 ;make zero based
moveq #1,d0 ;get 1 to init data stream
@skip1 lsr.l #1,d0 ;get one bit of src
bcc.s @cntSkip ;br if 0
bne.s @cntBlit ;br if 1
move.l -(a0),d0 ;else get next long of region data
roxr.l #1,d0 ;shift src bit out, 1 bit in
bcs.s @cntBlit ;br if 1
@cntSkip subq.w #4,d3 ;bump skip by -4
dbra d5,@skip1
bra.s endRun32
@goSkip move.l d3,(a2)+ ;write out blit/skip
moveq #0,d3 ;init blit/mask, skip cnt
bra.s @cntSkip
@blit1 lsr.l #1,d0 ;get one bit of src
bcc.s @goSkip ;br if 0
bne.s @goBlit ;br if 1
move.l -(a0),d0 ;else get next long of region data
roxr.l #1,d0 ;shift src bit out, 1 bit in
bcc.s @goSkip ;br if 1
@goBlit add.l d4,d3 ;bump blit cnt
@cntBlit dbra d5,@blit1
move.l d3,(a2)+ ;write out blit/skip
bra.s endRun32 ;use common exit
ENDPROC
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