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mac-rom/QuickDraw/Classic/BitBlt.m.a
Elliot Nunn 4325cdcc78 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 09:52:23 +08:00

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;EASE$$$ READ ONLY COPY of file ÒBITBLT.m.aÓ
; 1.1 CCH 11/11/1988 Fixed Header.
; 1.0 CCH 11/ 9/1988 Adding to EASE.
; OLD REVISIONS BELOW
; 1.2 CCH 10/12/1988 Changed Òm.GrafType.aÓ to ÒGrafType.m.aÓ.
; 1.1 MSH 5/18/88 Changed inclides to use m.GRAPHTYPES to work under EASE.
; 1.0 BBM 2/11/88 Adding file for the first time into EASEÉ
; END EASE MODIFICATION HISTORY
BLANKS ON
STRING ASIS
INCLUDE 'GRAFTYPES.m.a'
;---------------------------------------------------------------
;
; --> BITBLT.TEXT
;
; Low-level bit boundary block transfer.
;
BITBLT PROC EXPORT
IMPORT LEFTMASK,RIGHTMASK,PATEXPAND
;--------------------------------------------------------------
;
; PROCEDURE BitBlt(srcBits,dstBits: BitMap;
; srcRect,dstRect: Rect;
; mode: INTEGER; pat: Pattern);
;
; TRANSFERS A RECTANGULAR BLOCK OF BITS WITH NO CLIPPING AT ALL.
; MODE SPECIFIES THE COMBINATION MODE AND WHETHER THE SOURCE SHOULD COME
; FROM THE SOURCE BITMAP OR FROM A REPEATING PATTERN.
;
; COPYRIGHT APPLE COMPUTER INC.
; WRITTEN BY BILL ATKINSON
;
; POSITION INDEPENDENT AND RE-ENTRANT, CLOBBERS ONLY A0.
;
; MODES: 0 SRC --> DST
; 1 SRC OR DST --> DST
; 2 SRC XOR DST --> DST
; 3 SRC BIC DST --> DST
;
; 4 (NOT SRC) --> DST
; 5 (NOT SRC) OR DST --> DST
; 6 (NOT SRC) XOR DST --> DST
; 7 (NOT SRC) BIC DST --> DST
;
; 8 PATTERN --> DST
; 9 PATTERN OR DST --> DST
; 10 PATTERN XOR DST --> DST
; 11 PATTERN BIC DST --> DST
;
; 12 (NOT PATTERN) --> DST
; 13 (NOT PATTERN) OR DST --> DST
; 14 (NOT PATTERN) XOR DST --> DST
; 15 (NOT PATTERN) BIC DST --> DST
;
;
;----------------------------------------------------
;
; A6 OFFSETS OF PARAMETERS AFTER LINK:
;
PARAMSIZE EQU 22 ;SIZE OF PARAMETERS
SRCBITS EQU PARAMSIZE+8-4 ;LONG, ADDR OF BITMAP
DSTBITS EQU SRCBITS-4 ;LONG, ADDR OF BITMAP
SRCRECT EQU DSTBITS-4 ;LONG, ADDR OF RECT
DSTRECT EQU SRCRECT-4 ;LONG, ADDR OF RECT
MODE EQU DSTRECT-2 ;WORD
PAT EQU MODE-4 ;LONG, ADDR OF PATTERN
;----------------------------------------------------
;
; A6 OFFSETS OF LOCAL VARIABLES AFTER LINK:
;
EXPAT EQU -64 ;16 LONGS
SRCV EQU EXPAT-2 ;WORD
DSTV EQU SRCV-2 ;WORD
SRCROW EQU DSTV-2 ;WORD
DSTROW EQU SRCROW-2 ;WORD
srcBump EQU DSTROW-2 ;WORD
HEIGHT EQU srcBump-2 ;WORD
WORDCNT EQU HEIGHT-2 ;WORD
SAVEA5 EQU WORDCNT-4 ;LONG
VARSIZE EQU SAVEA5 ;SIZE OF LOCAL VARIABLES
;-------------------------------------------------------------------
;
; ENTER HERE. CALLER TAKES CARE OF CURSOR.
;
LINK A6,#VARSIZE ;ALLOCATE LOCAL VARIABLES
MOVEM.L D3-D7/A2-A5,-(SP) ;SAVE REGS
MOVE.L A5,SAVEA5(A6) ;SAVE GLOBAL POINTER
;----------------------------------------------------------------------
;
; GET PARAMETER POINTERS IN REGISTERS
;
MOVE.L SRCRECT(A6),A2 ;A2 POINTS TO SRCRECT
MOVE.L DSTRECT(A6),A3 ;A3 POINTS TO DSTRECT
MOVE.L SRCBITS(A6),A4 ;A4 POINTS TO SRCBITS
MOVE.L DSTBITS(A6),A5 ;A5 POINTS TO DSTBITS
;-------------------------------------------------------------
;
; CALC HEIGHT OF DSTRECT. QUIT IF HEIGHT <= 0
;
MOVE BOTTOM(A3),D0 ;GET BOTTOM
SUB TOP(A3),D0 ;CALC HEIGHT
BLE GOHOME ;QUIT IF HEIGHT <= 0
MOVE D0,HEIGHT(A6) ;SAVE FOR LATER
;--------------------------------------------------------------
;
; SET UP FOR TOP TO BOTTOM, LEFT TO RIGHT
; GET SRC AND DST TOP AND ROWBYTES
;
MOVEQ #2,D3 ;BUMP:=2 (TRANSFER LEFT TO RIGHT)
MOVE TOP(A2),D0 ;GET SRC TOP
SUB BOUNDS+TOP(A4),D0 ;CONVERT SRC TOP TO GLOBAL
MOVE D0,SRCV(A6) ;SAVE FOR LATER
MOVE TOP(A3),D0 ;GET DST TOP
SUB BOUNDS+TOP(A5),D0 ;CONVERT DST TOP TO GLOBAL
MOVE D0,DSTV(A6) ;SAVE FOR LATER
MOVE ROWBYTES(A4),SRCROW(A6) ;SRCROW:=SRCBITS.ROWBYTES
MOVE ROWBYTES(A5),DSTROW(A6) ;DSTROW:=DSTBITS.ROWBYTES
;--------------------------------------------------------------------
;
; SET UP INVERT FLAG, IN CASE SRC OR PATTERN WILL BE INVERTED
;
CLR D7 ;SAY NOT INVERTED
MOVE MODE(A6),D0 ;GET TRANSFER MODE
BTST #2,D0 ;IS MODE AN INV. ONE ?
BEQ.S MODEOK ;NOT INVERTED, CONTINUE
NOT D7 ;INVERTED, PUT -1 IN INVERT REG
MODEOK BTST #3,D0 ;WILL WE USE PATTERN ?
BEQ.S DIREC ;NO, DON'T BOTHER TO SET UP
;------------------------------------------------------------
;
; PATTERN WILL BE USED. EXPAND 8 BYTE PATTERN TO 16 LONGS.
;
MOVE BOUNDS+LEFT(A5),D2 ;GET GLOBAL-LOCAL OFFSET
MOVE.L PAT(A6),A0 ;POINT TO BYTE WIDE PATTERN
LEA EXPAT(A6),A1 ;POINT TO EXPANDED PATTERN
MOVE.L SAVEA5(A6),A5 ;GET GLOBAL POINTER
JSR PATEXPAND ;EXPAND 8 BYTES TO 16 LONGS
MOVE.L DSTBITS(A6),A5 ;RESTORE A5 TO DSTBITS
;------------------------------------------------------------
;
; SET UP (VERT * 4) MOD 64 AS PATTERN SELECTOR
;
MOVEQ #$F,D7 ;TREAT COORD MOD 16
AND TOP(A3),D7 ;GET DST TOP LOCAL COORD
LSL #2,D7 ;QUAD FOR LONG PATTERNS
MOVE.L EXPAT(A6,D7),D6 ;GET FIRST PATTERN DATA
BRA.S NOTSRC ;NOT USING SRC, SKIP OVER
;-----------------------------------------------------------
;
; SOURCE WILL BE USED, SO SET UP VERT AND HORIZ DIRECTIONS
; SUCH THAT SRC WON'T GET CLOBBERED TILL AFTER IT HAS BEEN USED
;
DIREC MOVE.L BASEADDR(A4),D0 ;GET SRC BASEADDR
CMP.L BASEADDR(A5),D0 ;ARE SRC AND DST ARRAYS THE SAME ?
BNE.S GETSRC ;NO, DONT WORRY ABOUT OVERLAP
MOVE SRCV(A6),D0 ;GET SRCV
CMP DSTV(A6),D0 ;IS SRCV > DSTV ?
BGT.S GETSRC ;YES, CONTINUE WITH TOP TO BOTTOM
BLT.S UPSIDE ;NO, DO UPSIDE DOWN
MOVE LEFT(A2),D0 ;SAME VERT, CHOOSE HORIZ DIRECTION
SUB BOUNDS+LEFT(A4),D0 ;CONVERT SRC LEFT TO GLOBAL
MOVE LEFT(A3),D1 ;GET DST LEFT
SUB BOUNDS+LEFT(A5),D1 ;CONVERT TO GLOBAL
CMP D1,D0 ;IS SRCLEFT < DSTLEFT ?
BGE.S GETSRC ;NO, DO LEFT TO RIGHT
NEG D3 ;YES, BUMP:=-2 (RIGHT TO LEFT)
BRA.S GETSRC ;CONTINUE
;----------------------------------------------------------
;
; DO UPSIDE DOWN TO AVOID CLOBBERING SRC
;
UPSIDE MOVE HEIGHT(A6),D0 ;GET HEIGHT
SUB #1,D0 ;CALC HEIGHT-1
ADD D0,SRCV(A6) ;SRCVERT:=SRCV+HEIGHT-1
ADD D0,DSTV(A6) ;DSTVERT:=DSTV+HEIGHT-1
NEG SRCROW(A6) ;SRCROW:=-SRCROW
NEG DSTROW(A6) ;DSTROW:=-DSTROW
;-----------------------------------------------------
;
; SET UP SHIFTCNT IN D6 (RELATIVE SHIFT BETWEEN SRC & DST)
;
GETSRC MOVE LEFT(A3),D6 ;GET DST LEFT
SUB BOUNDS+LEFT(A5),D6 ;CONVERT TO GLOBAL
MOVE LEFT(A2),D1 ;GET SRC LEFT
SUB BOUNDS+LEFT(A4),D1 ;CONVERT TO GLOBAL
SUB D1,D6 ;CALC DELTA HORIZ
AND #$F,D6 ;SHIFTCNT:=DELTA HORIZ MOD 16
;------------------------------------------------------------
;
; SET UP SRCLEFT IN A4, ADDR OF LEFTMOST SRC WORD
; (GOODBYE SRCBITS PTR)
;
MOVE SRCV(A6),D0 ;GET FIRST SRC VERT
MULU ROWBYTES(A4),D0 ;CALC SRC ROWBYTES * FIRST SRC VERT
MOVE.L BASEADDR(A4),A4 ;GET START OF SRC BITMAP
ADD.L D0,A4 ;ADD TO BITMAP START
ADD D6,D1 ;CALC SRCH+SHIFTCNT
ASR #3,D1 ;CONVERT BITS TO BYTE OFFSET
AND #$FFFE,D1 ;TRUNC TO WORD BOUNDARY
ADD D1,A4 ;LEAVE SRCLEFT IN A4
;------------------------------------------------------------
;
; SET UP DSTLEFT IN A5, ADDR OF LEFTMOST DST WORD
; (GOODBYE DSTBITS PTR)
;
NOTSRC MOVE LEFT(A3),D1 ;GET DST LEFT
SUB BOUNDS+LEFT(A5),D1 ;CONVERT TO GLOBAL
MOVE DSTV(A6),D0 ;GET FIRST DST VERT
MULU ROWBYTES(A5),D0 ;CALC DSTROW * FIRST DST VERT
MOVE.L BASEADDR(A5),A5 ;GET START OF DST BITMAP
ADD.L D0,A5 ;ADD DSTV*DSTROW
MOVE D1,D0 ;COPY DSTLEFT GLOBAL
ASR #4,D1 ;CONVERT FROM DOTS TO WORDS
ADD D1,D1 ;DOUBLE FOR BYTES
ADD D1,A5 ;LEAVE DSTLEFT IN A5
;-------------------------------------
;
; SET UP LEFTMASK IN D4
; (GOODBYE SRCRECT PTR)
;
MOVE D0,D1 ;SAVE DSTH
JSR LEFTMASK ;GET LEFTMASK
MOVE D0,D4 ;PUT IN D4
;-------------------------------------
;
; SET UP RIGHTMASK IN D5
; (GOODBYE DSTRECT PTR)
;
AND #$F,D1 ;TREAT DSTH MOD 16
MOVE RIGHT(A3),D0 ;GET DST RIGHT
SUB LEFT(A3),D0 ;CALC WIDTH
BLE GOHOME ;QUIT IF WIDTH <= 0
ADD D1,D0 ;CALC (DSTH MOD 16) + WIDTH
MOVE D0,D1 ;MAKE AN EXTRA COPY
JSR RIGHTMASK ;GET RIGHT MASK
MOVE D0,D5 ;SAVE RIGHTMASK IN D5
;------------------------------------------------
;
; CALC TOTAL NUMBER OF DST WORDS-1
;
ASR #4,D1 ;CALC ((DSTH MOD 16)+WIDTH) DIV 16
MOVE D1,WORDCNT(A6) ;SAVE AS WORDCNT
MOVE D1,D2 ;set up for below
;
; Set up srcBump and dstBump, assuming bumping to the right
;
ADD D1,D1 ;calc 2*wordCount
MOVE D1,D0 ;make a copy
ADD #2,D0 ;adjust for total bytesNeeded
;--------------------------------------------------------------------------
;
; IF DRAWING BACKWARDS FROM RIGHT, then adjust dstBump,
; ADJUST SRCADDR,DSTADDR TO FIRST WORD,
; AND SWAP LEFT AND RIGHT MASKS FOR FIRSTMASK AND LASTMASK.
;
MOVE D3,A0 ;put hBump (+-2) into A0
TST D3 ;ARE WE STARTING ON THE LEFT ?
BPL.S DIROK ;YES, CONTINUE
NEG D0 ;calc -1 * bytesNeeded
ADD D1,A5 ;ADJUST DSTADDR TO RIGHTMOST
ADD D1,A4 ;ADJUST SRCADDR TO RIGHTMOST
EXG D4,D5 ;FIRSTMASK=RIGHT,LASTMASK=LEFT
DIROK MOVE srcRow(A6),srcBump(A6)
SUB D0,srcBump(A6) ;srcBump := srcRow +- bytesBumped
MOVE dstRow(A6),A3
SUB D0,A3 ;dstBump := dstRow +- bytesBumped
;----------------------------------------------
;
; SET UP MODE CASE JUMP IN A1
;
GETMODE MOVE MODE(A6),D0 ;GET TRANSFER MODE
BNE.S NOTFAST ;BR IF NOT MODE 0
TST D6 ;IS SHIFTCNT 0 ?
BNE.S NOTFAST ;NO, CONTINUE
TST WORDCNT(A6) ;IS WORDCNT > 0 ?
BLE.S NOTFAST ;NO, CONTINUE
LEA SETUP0,A1 ;USE FAST COPY.
TST D3 ;ARE WE BUMPING LEFT TO RIGHT ?
BPL.S NEXTROW ;YES, ALL SET
LEA LEFT0,A1 ;NO, USE BACKWARDS LOOP
BRA.S NEXTROW
NOTFAST AND #$B,D0 ;TREAT MODE MOD 16 AND KILL INVERT BIT
MOVE D0,D1 ;MAKE A COPY
AND #3,D0 ;MASK FOR LOW BITS ONLY
ADD D0,D1 ;MAKE MODIFIED MODE * 2 FOR INDEX
TST D2 ;IS DST ALL IN ONE WORD ?
BNE.S DOMAIN ;NO, USE FIRST JUMP TABLE
ADD #16,D1 ;YES, USE SECOND JUMP TABLE
DOMAIN LEA MODETAB,A1 ;GET ADDRESS OF MODE TABLE
ADD 0(A1,D1),A1 ;POINT TO THIS MODE'S ROW LOOP
;---------------------------------------------------------
;
; OUTER LOOP: DO EACH SCAN LINE AND COME BACK TO NXTSRC OR NXTPAT.
; SOME MODES OPTIMIZE AND DO WHOLE OUTER LOOP AND COME BACK TO GOHOME.
;
NEXTROW MOVE HEIGHT(A6),D3 ;get height
SUB #1,D3 ;init DBRA rowcount
ROWLOOP MOVE D4,D1 ;MASK:=FIRSTMASK
MOVE WORDCNT(A6),D2 ;GET WORDCOUNT
JMP (A1) ;DO THIS ROW AND COME BACK
NXTSRC ADD srcBump(A6),A4 ;bump srcPtr to next row
ADD A3,A5 ;BUMP DSTADDR TO NEXT ROW
DBRA D3,ROWLOOP ;loop for all srcRows
BRA.S GOHOME ;then quit
NXTPAT ADD #4,D7 ;BUMP PATTERN SELECTOR
AND #$3F,D7 ;MOD 64 FOR 16 LONG REPEAT
MOVE.L EXPAT(A6,D7),D6 ;GET PATTERN DATA FOR NEXT ROW
ADD A3,A5 ;BUMP DSTADDR TO NEXT ROW
DBRA D3,ROWLOOP ;loop for all srcRows
;then quit
GOHOME MOVEM.L (SP)+,D3-D7/A2-A5 ;RESTORE REGS
UNLINK PARAMSIZE,'BITBLT '
;---------------------------------------------------------------;
; ;
; INTERFACE TO EACH BITBLT SCANLINE LOOP: ;
; ;
; REGISTERS: A0: hBump (+-2) D0: scratch ;
; A1: MODE CASE JUMP D1: FIRSTMASK ;
; A2: used for loop jmp D2: WORDCNT ;
; A3: dstBump D3: height-1 ;
; A4: SRCPTR D4: FIRSTMASK ;
; A5: DSTPTR D5: LASTMASK ;
; A6: LOCALS D6: SHIFTCNT OR PATTERN ;
; A7: STACK PTR D7: INVERT OR PAT-SEL ;
; ;
;---------------------------------------------------------------;
MODETAB DC.W MAIN0-MODETAB ;JUMP TABLE USED IF DST WIDER THAN ONE WORD
DC.W MAIN1-MODETAB
DC.W MAIN2-MODETAB
DC.W MAIN3-MODETAB
DC.W SETUP8-MODETAB
DC.W MAIN9-MODETAB
DC.W SETUP10-MODETAB
DC.W MAIN11-MODETAB
DC.W END0-MODETAB ;JUMP TABLE USED IF DST FITS IN ONE WORD WIDE
DC.W END1-MODETAB
DC.W END2-MODETAB
DC.W END3-MODETAB
DC.W WORD8-MODETAB
DC.W END9-MODETAB
DC.W END10-MODETAB
DC.W END11-MODETAB
;------------------------------------------------------------
;
; OPTIMIZE RIGHT HORIZONTAL SCROLL IF NO SHIFT.
; ONLY IF MODE 0, BUMPING RIGHT TO LEFT, WORDCNT > 0, AND NO SHIFT.
;
LEFT0 MOVE (A4),D0 ;GET SRC FROM BITMAP
ADD A0,A4 ;BUMP LEFT
AND D1,D0 ;MASK FIRST WORD
NOT D1 ;MAKE NOTMASK
AND (A5),D1 ;GET DATA FROM DST
OR D1,D0 ;MERGE WITH SRC DATA
MOVE D0,(A5) ;PUT RESULT TO DST
ADD A0,A5 ;BUMP LEFT
MOVEQ #-1,D1 ;FLUSH MASK FOR END0
SUB #1,D2 ;DEC WORD COUNT
BEQ.S END0 ;BR IF NO UNMASKED WORDS
SUB A0,A4 ;GET READY FOR PRE-DECREMENT
SUB A0,A5 ;GET READY FOR PRE-DECREMENT
LSR #1,D2 ;HALVE WORDCOUNT FOR LONGCOUNT
BCC.S LONE0 ;BR IF EVEN # WORDS LEFT
MOVE -(A4),-(A5) ;ELSE MAKE EVEN BY DOING A WORD
SUB #1,D2 ;ADJUST LONGCOUNT
BRA.S LMORE0 ;SEE IF ANY LONGS LEFT TO DO
LTWO0 MOVE.L -(A4),-(A5) ;MOVE A LONG WORD
LONE0 MOVE.L -(A4),-(A5) ;MOVE ANOTHER LONG
SUB #2,D2 ;ANY UNMASKED LONGS LEFT IN ROW ?
LMORE0 BGT LTWO0 ;YES, AT LEAST 2 LONGS LEFT
BEQ LONE0 ;YES, FINISH UP LAST LONG
ADD A0,A4 ;RETURN TO NORMAL AFTER PRE-DECREMENT
ADD A0,A5 ;RETURN TO NORMAL AFTER PRE-DECREMENT
BRA.S END0 ;DO LAST WORD WITH MASK
;------------------------------------------------------------
;
; OPTIMIZE VERTICAL AND LEFT HORIZONTAL SCROLL IF SHIFT = 0.
; ONLY IF MODE 0, BUMPING LEFT TO RIGHT, WORDCNT > 0, AND NO SHIFT.
;
SETUP0 LEA FAST0,A1 ;only do setup once
LEA COPYBIG,A2 ;point to big copy
BRA CALCLP ;share loop calc
FAST0 MOVE (A4)+,D0 ;GET SRC FROM BITMAP
AND D1,D0 ;MASK FIRST WORD
NOT D1 ;MAKE NOTMASK
AND (A5),D1 ;GET DST DATA
OR D1,D0 ;MERGE WITH SRC DATA
MOVE D0,(A5)+ ;PUT RESULT TO DST
MOVEQ #-1,D1 ;FLUSH MASK FOR END0
SUB #1,D2 ;DEC WORD COUNT
BEQ.S END0 ;BR IF NO UNMASKED WORDS
JSR (A2) ;call unwound copy loop
MOVEQ #-1,D2 ;force finish up below
;-------------------------------------------------------
;
; MODE 0 OR 4: SRC --> DST
;
END0 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN0 MOVE.L -2(A4),D0 ;GET SRC FROM BITMAP
ADD A0,A4 ;BUMP SRCPTR LEFT OR RIGHT
LSR.L D6,D0 ;ALIGN TO DST
EOR D7,D0 ;INVERT SRC IF MODE BIT 2 SET
AND D1,D0 ;MASK SRC
NOT D1 ;FORM NOTMASK
AND (A5),D1 ;GET DST DATA
OR D1,D0 ;MERGE WITH SRC DATA
MOVE D0,(A5) ;PUT RESULT TO DST
ADD A0,A5 ;BUMP DSTPTR LEFT OR RIGHT
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN0 ;BR IF UNMASKED WORDS LEFT
BEQ END0 ;DO LAST WORD WITH LASTMASK
BRA NXTSRC ;LOOP BACK FOR MORE
;----------------------------------------------------------
;
; Call copybig with wordcount in D2 (clobbered)
;
COPYBIG BCLR #0,D2 ;is wordcount even ?
BEQ.S @1 ;yes, continue
MOVE.W (A4)+,(A5)+ ;no, make it even
@1 SUB #32,D2 ;calc wordcount-32
BLE.S @2 ;continue if wordcount <= 32
BSR.S COPY32 ;else copy 32 words
BRA.S @1 ;and loop for more
@2 NEG D2 ;calc 32-wordcount
JMP COPY32(D2) ;jump into loop
COPY32 MOVE.L (A4)+,(A5)+ ;TABLE TO COPY 0..32 WORDS
MOVE.L (A4)+,(A5)+ ;wordCount = 30
MOVE.L (A4)+,(A5)+ ;wordCount = 28
MOVE.L (A4)+,(A5)+ ;wordCount = 26
MOVE.L (A4)+,(A5)+ ;wordCount = 24
MOVE.L (A4)+,(A5)+ ;wordCount = 22
MOVE.L (A4)+,(A5)+ ;wordCount = 20
MOVE.L (A4)+,(A5)+ ;wordCount = 18
MOVE.L (A4)+,(A5)+ ;wordCount = 16
MOVE.L (A4)+,(A5)+ ;wordCount = 14
MOVE.L (A4)+,(A5)+ ;wordCount = 12
MOVE.L (A4)+,(A5)+ ;wordCount = 10
MOVE.L (A4)+,(A5)+ ;wordCount = 8
MOVE.L (A4)+,(A5)+ ;wordCount = 6
MOVE.L (A4)+,(A5)+ ;wordCount = 4
MOVE.L (A4)+,(A5)+ ;wordCount = 2
COPY0 RTS ;wordCount = 0
COPY31 MOVE.L (A4)+,(A5)+ ;TABLE TO COPY 1..31 WORDS
MOVE.L (A4)+,(A5)+ ;wordCount = 29
MOVE.L (A4)+,(A5)+ ;wordCount = 27
MOVE.L (A4)+,(A5)+ ;wordCount = 25
MOVE.L (A4)+,(A5)+ ;wordCount = 23
MOVE.L (A4)+,(A5)+ ;wordCount = 21
MOVE.L (A4)+,(A5)+ ;wordCount = 19
MOVE.L (A4)+,(A5)+ ;wordCount = 17
MOVE.L (A4)+,(A5)+ ;wordCount = 15
MOVE.L (A4)+,(A5)+ ;wordCount = 13
MOVE.L (A4)+,(A5)+ ;wordCount = 11
MOVE.L (A4)+,(A5)+ ;wordCount = 9
MOVE.L (A4)+,(A5)+ ;wordCount = 7
MOVE.L (A4)+,(A5)+ ;wordCount = 5
MOVE.L (A4)+,(A5)+ ;wordCount = 3
COPY1 MOVE.W (A4)+,(A5)+ ;wordCount = 1
RTS
;-------------------------------------------------------
;
; MODE 1 OR 5: SRC OR DST --> DST
;
END1 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN1 MOVE.L -2(A4),D0 ;GET SRC FROM BITMAP
ADD A0,A4 ;BUMP SRCPTR LEFT OR RIGHT
LSR.L D6,D0 ;ALIGN TO DST
EOR D7,D0 ;INVERT SRC IF MODE BIT 2 SET
AND D1,D0 ;MASK SRC
OR D0,(A5) ;OR SRC INTO DST
ADD A0,A5 ;BUMP DSTPTR LEFT OR RIGHT
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN1 ;LOOP TILL LAST WORD
BEQ END1 ;DO LAST WORD WITH LASTMASK
BRA NXTSRC ;LOOP BACK FOR NEXT ROW
;-------------------------------------------------------
;
; MODE 2 OR 6: SRC XOR DST --> DST
;
END2 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN2 MOVE.L -2(A4),D0 ;GET SRC FROM BITMAP
ADD A0,A4 ;BUMP SRCPTR LEFT OR RIGHT
LSR.L D6,D0 ;ALIGN TO DST
EOR D7,D0 ;INVERT SRC IF MODE BIT 2 SET
AND D1,D0 ;MASK SRC
EOR D0,(A5) ;XOR SRC INTO DST
ADD A0,A5 ;BUMP DSTPTR LEFT OR RIGHT
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN2 ;LOOP TILL LAST WORD
BEQ END2 ;DO LAST WORD WITH LASTMASK
BRA NXTSRC ;LOOP BACK FOR NEXT ROW
;-------------------------------------------------------
;
; MODE 3 OR 7: SRC BIC DST --> DST
;
END3 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN3 MOVE.L -2(A4),D0 ;GET SRC FROM BITMAP
ADD A0,A4 ;BUMP SRCPTR LEFT OR RIGHT
LSR.L D6,D0 ;ALIGN TO DST
EOR D7,D0 ;INVERT SRC IF MODE BIT 2 SET
AND D1,D0 ;MASK SRC
NOT D0 ;INVERT SRC
AND D0,(A5) ;BIT CLEAR SRC INTO DST
ADD A0,A5 ;BUMP DSTPTR LEFT OR RIGHT
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN3 ;LOOP TILL LAST WORD
BEQ END3 ;DO LAST WORD WITH LASTMASK
BRA NXTSRC ;LOOP BACK FOR NEXT ROW
;-----------------------------------------------------------
;
; OPTIMIZE MODE 8 OR 12 IF DST FITS IN ONE WORD (VERT LINES ETC)
;
WORD8 AND D5,D1 ;COMBINE LEFT AND RIGHT MASKS
MOVE D1,D5 ;COPY COMBINED MASK
NOT D5 ;FORM NOTMASK
WORD8A AND D1,D6 ;MASK EXTRA PATTERN TO ZEROS
MOVE (A5),D0 ;GET DST DATA
AND D5,D0 ;AND WITH NOTMASK
OR D6,D0 ;MERGE WITH SRC DATA
MOVE D0,(A5)+ ;PUT RESULT TO DST
ADD A3,A5 ;BUMP DSTPTR TO NEXT ROW
ADD #4,D7 ;BUMP PATTERN SELECTOR
AND #$3F,D7 ;MOD 64 FOR 16 LONG REPEAT
MOVE EXPAT(A6,D7),D6 ;GET PATTERN FOR NEXT ROW
DBRA D3,WORD8A ;LOOP ALL ROWS
BRA GOHOME
;-------------------------------------------------------
;
; MODE 8 OR 12: PATTERN --> DST (FILLING AREAS, DRAWING LINES)
;
SETUP8 LEA FAST8,A1 ;only do setup once
LEA FILLBIG,A2 ;point to big fill
CALCLP CMP #32,D2 ;is wordcnt > 32 ?
BGT.S @2 ;yes use fillbig
ADD #COPY0+1-COPYBIG,A2 ;no, point to even table
BTST #0,D2 ;will wordcount-1 be even ?
BNE.S @1 ;yes, use even table
ADD #COPY1+1-COPY0,A2 ;no, point to odd table
@1 SUB D2,A2 ;adjust loop jump
@2 JMP (A1) ;re-connect with shared code
FAST8 MOVE D6,D0 ;GET PATTERN DATA
AND D1,D0 ;MASK FIRST WORD
NOT D1 ;MAKE NOTMASK
AND (A5),D1 ;GET DST DATA
OR D1,D0 ;MERGE WITH PAT DATA
MOVE D0,(A5)+ ;PUT RESULT TO DST
SUB #1,D2 ;DEC WORD COUNT
BEQ.S END8 ;BR IF NO UNMASKED WORDS
JSR (A2) ;call unwound loop
END8 MOVE D5,D1 ;MASK:= RIGHTMASK
AND D1,D6 ;MASK PATTERN
NOT D1 ;MAKE NOTMASK
AND (A5),D1 ;GET DST DATA
OR D1,D6 ;MERGE WITH PAT DATA
MOVE D6,(A5)+ ;PUT RESULT TO DST
BRA NXTPAT ;LOOP BACK FOR NEXT ROW
;----------------------------------------------------------
;
; Call fillbig with wordcount in D2 (clobbered)
;
FILLBIG BCLR #0,D2 ;is wordcount even ?
BEQ.S @1 ;yes, continue
MOVE.W D6,(A5)+ ;no, make it even
@1 SUB #32,D2 ;calc wordcount-32
BLE.S @2 ;continue if wordcount <= 32
BSR.S FILL32 ;elsae fill 32 words
BRA.S @1 ;and loop for more
@2 NEG D2 ;calc 32-wordcount
JMP FILL32(D2) ;jump into loop
FILL32 MOVE.L D6,(A5)+ ;TABLE TO FILL 0..32 WORDS
MOVE.L D6,(A5)+ ;wordCount = 30
MOVE.L D6,(A5)+ ;wordCount = 28
MOVE.L D6,(A5)+ ;wordCount = 26
MOVE.L D6,(A5)+ ;wordCount = 24
MOVE.L D6,(A5)+ ;wordCount = 22
MOVE.L D6,(A5)+ ;wordCount = 20
MOVE.L D6,(A5)+ ;wordCount = 18
MOVE.L D6,(A5)+ ;wordCount = 16
MOVE.L D6,(A5)+ ;wordCount = 14
MOVE.L D6,(A5)+ ;wordCount = 12
MOVE.L D6,(A5)+ ;wordCount = 10
MOVE.L D6,(A5)+ ;wordCount = 8
MOVE.L D6,(A5)+ ;wordCount = 6
MOVE.L D6,(A5)+ ;wordCount = 4
MOVE.L D6,(A5)+ ;wordCount = 2
RTS ;wordCount = 0
FILL31 MOVE.L D6,(A5)+ ;TABLE TO FILL 1..31 WORDS
MOVE.L D6,(A5)+ ;wordCount = 29
MOVE.L D6,(A5)+ ;wordCount = 27
MOVE.L D6,(A5)+ ;wordCount = 25
MOVE.L D6,(A5)+ ;wordCount = 23
MOVE.L D6,(A5)+ ;wordCount = 21
MOVE.L D6,(A5)+ ;wordCount = 19
MOVE.L D6,(A5)+ ;wordCount = 17
MOVE.L D6,(A5)+ ;wordCount = 15
MOVE.L D6,(A5)+ ;wordCount = 13
MOVE.L D6,(A5)+ ;wordCount = 11
MOVE.L D6,(A5)+ ;wordCount = 9
MOVE.L D6,(A5)+ ;wordCount = 7
MOVE.L D6,(A5)+ ;wordCount = 5
MOVE.L D6,(A5)+ ;wordCount = 3
MOVE.W D6,(A5)+ ;wordCount = 1
RTS
;-------------------------------------------------------
;
; MODE 9 OR 13: PATTERN OR DST --> DST
;
END9 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN9 MOVE D6,D0 ;GET PATTERN DATA
AND D1,D0 ;MASK PATTERN
OR D0,(A5)+ ;OR PATTERN INTO DST
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN9 ;LOOP TILL LAST WORD
BEQ END9 ;DO LAST WORD WITH LASTMASK
BRA NXTPAT ;LOOP BACK FOR NEXT ROW
;-------------------------------------------------------
;
; MODE 10 OR 14: PATTERN XOR DST --> DST (INVERTING AREAS, XOR LINES)
;
SETUP10 LEA FAST10,A1 ;only do setup once
LEA XORBIG,A2 ;point to big fill
BRA CALCLP ;share loop calc
FAST10 MOVE D6,D0 ;GET PATTERN DATA
AND D1,D0 ;MASK FIRST WORD
EOR D0,(A5)+ ;XOR PATTERN INTO DST
MOVEQ #-1,D1 ;FLUSH MASK FOR END10
SUB #1,D2 ;DEC WORD COUNT
BEQ.S END10 ;BR IF NO UNMASKED WORDS
JSR (A2) ;call unwound loop
MOVEQ #-1,D2 ;force finish up below
END10 AND D5,D1 ;MASK:=MASK AND LASTMASK
AND D1,D6 ;MASK PATTERN
EOR D6,(A5)+ ;XOR PATTERN DATA INTO DST
BRA NXTPAT ;LOOP BACK FOR NEXT ROW
;----------------------------------------------------------
;
; Call XORbig with wordcount in D2 (clobbered)
;
XORBIG BCLR #0,D2 ;is wordcount even ?
BEQ.S @1 ;yes, continue
EOR.W D6,(A5)+ ;no, make it even
@1 SUB #32,D2 ;calc wordcount-32
BLE.S @2 ;continue if wordcount <= 32
BSR.S XOR32 ;else XOR 32 words
BRA @1 ;and loop for more
@2 NEG D2 ;calc 32-wordcount
JMP XOR32(D2) ;jump into loop
XOR32 EOR.L D6,(A5)+ ;TABLE TO XOR 0..32 WORDS
EOR.L D6,(A5)+ ;wordCount = 30
EOR.L D6,(A5)+ ;wordCount = 28
EOR.L D6,(A5)+ ;wordCount = 26
EOR.L D6,(A5)+ ;wordCount = 24
EOR.L D6,(A5)+ ;wordCount = 22
EOR.L D6,(A5)+ ;wordCount = 20
EOR.L D6,(A5)+ ;wordCount = 18
EOR.L D6,(A5)+ ;wordCount = 16
EOR.L D6,(A5)+ ;wordCount = 14
EOR.L D6,(A5)+ ;wordCount = 12
EOR.L D6,(A5)+ ;wordCount = 10
EOR.L D6,(A5)+ ;wordCount = 8
EOR.L D6,(A5)+ ;wordCount = 6
EOR.L D6,(A5)+ ;wordCount = 4
EOR.L D6,(A5)+ ;wordCount = 2
RTS ;wordCount = 0
XOR31 EOR.L D6,(A5)+ ;TABLE TO XOR 1..31 WORDS
EOR.L D6,(A5)+ ;wordCount = 29
EOR.L D6,(A5)+ ;wordCount = 27
EOR.L D6,(A5)+ ;wordCount = 25
EOR.L D6,(A5)+ ;wordCount = 23
EOR.L D6,(A5)+ ;wordCount = 21
EOR.L D6,(A5)+ ;wordCount = 19
EOR.L D6,(A5)+ ;wordCount = 17
EOR.L D6,(A5)+ ;wordCount = 15
EOR.L D6,(A5)+ ;wordCount = 13
EOR.L D6,(A5)+ ;wordCount = 11
EOR.L D6,(A5)+ ;wordCount = 9
EOR.L D6,(A5)+ ;wordCount = 7
EOR.L D6,(A5)+ ;wordCount = 5
EOR.L D6,(A5)+ ;wordCount = 3
EOR.W D6,(A5)+ ;wordCount = 1
RTS
;-------------------------------------------------------
;
; MODE 11 OR 15: PATTERN BIC DST --> DST
;
END11 AND D5,D1 ;MASK:=MASK AND LASTMASK
MAIN11 MOVE D6,D0 ;GET PATTERN DATA
AND D1,D0 ;MASK PATTERN
NOT D0 ;INVERT PATTERN
AND D0,(A5)+ ;BIC PATTERN INTO DST
MOVEQ #-1,D1 ;FLUSH MASK
SUB #1,D2 ;DEC WORD COUNT
BGT MAIN11 ;LOOP TILL LAST WORD
BEQ END11 ;DO LAST WITH LASTMASK
BRA NXTPAT ;LOOP BACK FOR NEXT ROW
DC.B '(c) Apple Computer Inc., 1983-1985'
END
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