632 lines
21 KiB
Plaintext
632 lines
21 KiB
Plaintext
;
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; File: getPMData.a
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;
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; Copyright: © 1989-1991 by Apple Computer, Inc., all rights reserved.
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;
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; Change History (most recent first):
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;
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; <5> 10/2/91 DTY Conditionalise last change for TheFuture.
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; <4> 10/1/91 KON Check for QDError = AbortPicPlaybackErr after calling
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; GetPicData. If an error is detected, abort immediately.
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; <3> 8/2/90 gbm Change some identifiers that conflict with existing ones
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; <1+> 1/3/90 BAL Fix bug in call to stackspace.
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; <1.0> 11/15/89 KON Broken out of pictures.a
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;
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; To Do:
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;
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;EASE$$$ READ ONLY COPY of file “GetPMData.a”
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; 1.0 KON 11/15/1989 Broken out of pictures.a
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; END EASE MODIFICATION HISTORY
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GetDirectPMData PROC EXPORT
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IMPORT GetBigPicData, UnPackWords, GetPicData, GetUByte, GetWord
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;------------------------------------------------------
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;
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; PROCEDURE GetDirectPMData(myDst: Ptr; myData: Handle);
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;
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; HANDLE SIZE IS SET TO ROWBYTES*(BOUNDS.BOTTOM-BOUNDS.TOP) EXTERNALLY
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; Handle is locked by caller.
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;
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;
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PARAMSIZE EQU 8
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MYDST EQU PARAMSIZE+8-4 ;DST PIXMAP POINTER
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MYDATA EQU MYDST-4 ;DST DATA HANDLE
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SRCPTR EQU -4 ;VAR POINTER TO SOURCE
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DSTPTR EQU SRCPTR-4 ;VAR POINTER TO DST
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DSTBUF EQU DSTPTR-4 ;POINTER TO WINDING BUFFER
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PACKBUF EQU DSTBUF-4 ;POINTER TO PACKING BUFFER
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SAVEDSP EQU PACKBUF-4 ;PRESERVE STACK POINTER
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PackHandle equ SAVEDSP-4
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VARSIZE EQU PackHandle
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LINK A6,#VARSIZE ;MAKE A STACK FRAME
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MOVEM.L D3-D7/A2-A4,-(SP) ;SAVE WORK REGISTERS
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MOVE.L SP,SAVEDSP(A6) ;PRESERVE STACK POINTER
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MOVE.L MYDST(A6),A2 ;POINT TO BITMAP
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MOVE.L MYDATA(A6),A0 ;GET DATA HANDLE
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;_HLOCK ;LOCK IT DOWN
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MOVE.L (A0),A3 ;GET DATA POINTER IN A3
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MOVEQ #8,D6 ;GET USEFUL VALUE
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MOVE BOUNDS+BOTTOM(A2),D7
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SUB BOUNDS+TOP(A2),D7 ;HEIGHT := BOUNDS BOT - TOP
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MOVE ROWBYTES(A2),D5 ;GET ROWBYTES
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AND #nuRBMask,D5 ;CLEAR OFF FLAG BITS
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CMP D6,D5 ;IS NEWROW < 8 ?
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BLT NOPACK ;=>YES, DON'T UNPACK
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;----------------------------------------------------------------
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;
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; Determine desired packing scheme:
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;
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; Type Depth(s) Description
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; ---- -------- -----------
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; 1 16/32 No packing; Memory image (Handled by GetPMData)
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; 2 16 Pixel packing; RunLength by pixel size (PackWords)
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; 3 32 Drop pad byte; Save RGB triples
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; 4 32 Run packing; RunLength by component by scanline
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; >4 32 UNKNOWN; skip data for future compatibility
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;
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cmp.w #4,packType(a2) ;which packing format?
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bgt SkipScans ;unknown, skip over data
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beq.s RunPacking ;unpack by cmp by scan
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cmp.w #3,packType(a2) ;which packing format?
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beq PixelPacking ;run length (16 bit) pixels
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MakePadByte
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move.w d5,d0 ;get rowbytes
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mulu.w d7,d0 ;get rowbytes * height
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lsr.l #2,d0 ;get pixel count = byte count / 4
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move.l d0,d7 ;make a copy in d7
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add.l d0,d0 ;2 * pixel count
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add.l d7,d0 ;3 * pixel count
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MOVE.L A3,-(SP) ;PUSH DATA POINTER
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add.l d7,(sp) ;advance 1/4 way into data buffer
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MOVE.L d0,-(SP) ;PUSH BYTECOUNT
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JSR GetBigPicData ;READ DATA RGB's
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move.l a3,a0 ;point to output buffer
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move.l a3,a1 ;
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add.l d7,a1 ;advance to RGB triples
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@1 clr.b (a0)+ ;clear out alpha channel
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move.b (a1)+,(a0)+ ;copy red
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move.b (a1)+,(a0)+ ;copy green
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move.b (a1)+,(a0)+ ;copy blue
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subq.l #1,d7 ;for all output pixels
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bhi.s @1
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bra done ;clean up and return
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RunPacking
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;----------------------------------------------------------------
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;
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; ALLOCATE PACKBUF ON THE STACK
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;
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clr.l packHandle(a6) ;assume there'll be space on stack
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_StackSpace ;make sure we have enough...
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ext.l d5 ;make rowbytes a long
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cmp.l d0,d5 ;...room to allocate one buffer
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bge SkipScans ;just consume data and return
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;
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;Stack space exists for at least one buffer.
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;
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SUB D5,SP ;GET SIZE OF DSTBUF
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MOVE.L SP,DSTBUF(A6) ;POINT TO DSTBUF
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moveq #0, d1 ;clear high bytes
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MOVE D5,D1 ;GET ROWBYTES
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LSR #7,D1 ;GET # OF 128 BYTE RUNS
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ADDQ #2,D1 ;ROUND UP
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bclr #0,d1 ;guarantee A7 word alignment <BAL 28Apr89>
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add.l d5,d1 ;get buffer+padding
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_StackSpace ;room for second buffer?
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cmp.l d0, d1
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blt.s @UseStack
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move.l d1,d0
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_NewHandle
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bne SkipScans
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move.l (a0), packbuf(a6)
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move.l a0, packHandle(a6)
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_HLock
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bra.s BufferAllocated
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@UseStack
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sub d1, sp
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move.l sp, packbuf(a6)
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BufferAllocated
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CMP #4,CMPCOUNT(A2) ;MUST WE CLEAR DEST PAD BYTE?
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BEQ.S NOPAD ;NO, SKIP CLEARING
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MOVE D5,D1 ;GET DEST ROWBYTES
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MULU D7,D1 ;CALC DEST BYTES = ROWBYTES*HEIGHT
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LSR.L #2,D1 ;GET LONG CNT OF LONGS
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MOVE D1,D2 ;GET LOWORD IN D2
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SWAP D1 ;GET HIWORD IN D1
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MOVEQ #0,D3 ;USE AS SRC OF ZERO'S
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MOVE.L A3,A0 ;POINT AT DEST
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BRA.S @CLR
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@1 MOVE.L D3,(A0)+
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@CLR DBRA D2,@1
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DBRA D1,@CLR
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;----------------------------------------------------------------
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;
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; PACKED FORMAT = [BYTECOUNT][rrrrr...ggggg...bbbbb] FOR EACH SCANLINE
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;
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; IF ROWBYTES > 250 THEN BYTECOUNT IS A WORD, ELSE IT IS A BYTE
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;
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; ASSUME: PIXELSIZE = 32
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; CMPSIZE = 8
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; CMPCOUNT = 3,4
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NOPAD ADDQ #4,A3 ;POINT PAST END OF FIRST PIXEL
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SUB CMPCOUNT(A2),A3 ;POINT TO FIRST CMP OF FIRST PIXEL
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MOVE D5,D4 ;GET FINAL ROWBYTES
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LSR #2,D4 ;GET PIXEL CNT **** ASSUMES PIXSIZE = 32
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MULU CMPCOUNT(A2),D4 ;GET COMPRESSED ROWBYTES
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BRA.S START4 ;GO TO LOOP START
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MORE4 CMP #250,D5 ;IS ROWBYTES > 250?
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BGT.S @1 ;=>YES, GET WORD
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JSR GetUByte ;ELSE GET A BYTE INTO D0
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BRA.S @2 ;=>AND GO GET DATA
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@1 JSR GETWORD ;GET A WORD INTO D0
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@2 MOVE.L PACKBUF(A6),-(SP) ;PUSH ADDR OF BUFFER
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MOVE.L (SP),SRCPTR(A6) ;PUT IN SRCPTR TOO
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MOVE D0,-(SP) ;PUSH BYTECOUNT
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JSR GetPicData ;GET PACKED DATA
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if TheFuture then ; Build only for TheFuture <5>
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cmp.w #AbortPicPlayBackErr,qdErr ;abort if our special error <4>
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beq.s Abort
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endif ; <5>
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MOVE.L DSTBUF(A6),DSTPTR(A6) ;SET DSTPTR TO WINDING BUFFER
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PEA SRCPTR(A6) ;PUSH VAR SRCPTR
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PEA DSTPTR(A6) ;PUSH VAR DSTPTR
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MOVE D4,-(SP) ;PUSH COMPRESSED ROWBYTES
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_UnpackBits ;UNPACK INTO DATA HANDLE
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MOVE CMPCOUNT(A2),D3 ;GET CMPCOUNT FOR LOOP <16Jun88 BAL>>
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SUBQ #1,D3 ;MAKE IT ZERO BASED
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MOVE.L DSTBUF(A6),A0 ;POINT TO UNWINDING BUFFER
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MOVE D5,D0 ;GET ROWBYTES
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LSR #2,D0 ;GET PIXEL WIDTH @@@@@
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SUBQ #1,D0 ;MAKE IT ZERO BASED
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@NXTCMP MOVE.L A3,A4 ;PTR INTO THIS CMP OF FIRST PIXEL
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ADDQ #1,A3 ;POINT AT NEXT CMP
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MOVE D0,D6 ;GET PIXEL CNT
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@NXTPIX MOVE.B (A0)+,(A4) ;COPY COMPONENT
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ADDQ #4,A4 ;BUMP TO NEXT PIXEL
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DBRA D6,@NXTPIX
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DBRA D3,@NXTCMP ; <16Jun88 BAL><
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SUB CMPCOUNT(A2),A3 ;RESET A3 TO FIRSTCMP, FIRSTPIX
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ADD D5,A3 ;BUMP TO NEXT DEST ROW
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START4 DBRA D7,MORE4 ;LOOP HEIGHT ROWS
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Abort move.l packHandle(a6), d0
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beq done ;nil handle: must have used stack buffer
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move.l d0, a0
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_DisposHandle
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BRA DONE ;CONTINUE
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PixelPacking
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;----------------------------------------------------------------
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;
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; ALLOCATE PACKBUF ON THE STACK
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;
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SUB D5,SP ;SET SIZE OF PACKBUF
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SUB D5,SP ;TO 2*ROWBYTES FOR LONG ALIGNMENT
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MOVE.L SP,PACKBUF(A6) ;POINT TO PACKBUF
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;----------------------------------------------------------------
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;
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; PACKED FORMAT = [BYTECOUNT][DATA] FOR EACH SCANLINE
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;
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; IF ROWBYTES > 250 THEN BYTECOUNT IS A WORD, ELSE IT IS A BYTE
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;
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MOVE.L A3,DSTPTR(A6) ;INIT DSTPTR
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BRA.S START3 ;GO TO LOOP START
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MORE3 CMP #250,D5 ;IS ROWBYTES > 250?
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BGT.S @1 ;=>YES, GET WORD
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JSR GetUByte ;ELSE GET A BYTE INTO D0
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BRA.S @2 ;=>AND GO GET DATA
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@1 JSR GETWORD ;GET A WORD INTO D0
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@2 MOVE.L PACKBUF(A6),-(SP) ;PUSH ADDR OF BUFFER
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MOVE.L (SP),SRCPTR(A6) ;PUT IN SRCPTR TOO
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MOVE D0,-(SP) ;PUSH BYTECOUNT
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JSR GetPicData ;GET PACKED DATA
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if TheFuture then ; Build only in TheFuture <5>
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cmp.w #AbortPicPlayBackErr,qdErr ;abort if our special error <4>
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beq.s done
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endif ; <5>
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PEA SRCPTR(A6) ;PUSH VAR SRCPTR
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PEA DSTPTR(A6) ;PUSH VAR DSTPTR
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MOVE D5,-(SP) ;PUSH ROWBYTES
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jsr UnPackWords ;UNPACK INTO DATA HANDLE
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START3 DBRA D7,MORE3 ;LOOP HEIGHT ROWS
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BRA.S DONE ;CONTINUE
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SkipScans
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;----------------------------------------------------------------
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;
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; PACKED FORMAT = [BYTECOUNT][DATA] FOR EACH SCANLINE
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;
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; IF ROWBYTES > 250 THEN BYTECOUNT IS A WORD, ELSE IT IS A BYTE
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;
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move.w d5,d6 ;get rowbytes
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mulu.w d7,d6 ;get rowbytes * height
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BRA.S START5 ;GO TO LOOP START
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MORE5 CMP #250,D5 ;IS ROWBYTES > 250?
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BGT.S @1 ;=>YES, GET WORD
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JSR GetUByte ;ELSE GET A BYTE INTO D0
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BRA.S @2 ;=>AND GO GET DATA
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@1 JSR GETWORD ;GET A WORD INTO D0
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@2 MOVE.L A3,-(SP) ;PUSH DST ADDR
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MOVE D0,-(SP) ;PUSH BYTECOUNT
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JSR GetPicData ;GET PACKED DATA
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if TheFuture then ; Don’t build until TheFuture is here <5>
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cmp.w #AbortPicPlayBackErr,qdErr ;abort if our special error <4>
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beq.s done
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endif ; <5>
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START5 DBRA D7,MORE5 ;LOOP HEIGHT ROWS
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move.l a3,a0 ;point to output buffer
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@1 clr.b (a0)+ ;clear out buffer
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subq.l #1,d6 ;for all output pixels
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bhi.s @1
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BRA.S DONE ;CONTINUE
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;----------------------------------------------------------------
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;
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;
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; ROWBYTES < 8, DON'T USE PACKING
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;
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NOPACK MULU D7,D5 ;BYTECOUNT := HEIGHT * WIDTH
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MOVE.L A3,-(SP) ;PUSH DATA POINTER
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MOVE.l D5,-(SP) ;PUSH BYTECOUNT as a long
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JSR GetBigPicData ;READ BITMAP DATA BITS
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DONE MOVE.L MYDATA(A6),A0 ;GET DATA HANDLE
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;_HUnlock ;AND UNLOCK IT
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MOVE.L SAVEDSP(A6),SP ;RESTORE STACK POINTER
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MOVEM.L (SP)+,D3-D7/A2-A4 ;RESTORE WORK REGISTERS
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UNLINK PARAMSIZE,'GETDPMDAT' ;UNLINK AND RETURN
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GetPMData PROC EXPORT
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IF (&TYPE('PATCHMAC2') = 'UNDEFINED') THEN
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IMPORT GetPicData, GetUByte, GetWord, GetDirectPMData, GetBigPicData
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ENDIF
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;------------------------------------------------------
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;
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; PROCEDURE GetPMData(myDst: Ptr; myData: Handle);
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;
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; HANDLE SIZE IS SET TO ROWBYTES*(BOUNDS.BOTTOM-BOUNDS.TOP) EXTERNALLY
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; Assume handle is locked externally since this routine will be called
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; repeatedly during a banding operation.
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;
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PARAMSIZE EQU 8
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MYDST EQU PARAMSIZE+8-4 ;DST PIXMAP POINTER
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MYDATA EQU MYDST-4 ;DST DATA HANDLE
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SRCPTR EQU -4 ;VAR POINTER TO SOURCE
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DSTPTR EQU SRCPTR-4 ;VAR POINTER TO DST
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PACKBUF EQU DSTPTR-4 ;POINTER TO PACKING BUFFER
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SAVEDSP EQU PACKBUF-4 ;PRESERVE STACK POINTER
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VARSIZE EQU SAVEDSP
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LINK A6,#VARSIZE ;MAKE A STACK FRAME
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MOVEM.L D4-D6/A2-A3,-(SP) ;SAVE WORK REGISTERS
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MOVE.L SP,SAVEDSP(A6) ;PRESERVE STACK POINTER
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MOVE.L MYDST(A6),A2 ;POINT TO BITMAP
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MOVE.L MYDATA(A6),A0 ;GET DATA HANDLE
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;_HLOCK ;(assume it is locked already) <16Jun88 BAL>
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MOVE.L (A0),A3 ;GET DATA POINTER IN A3
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MOVEQ #8,D6 ;GET USEFUL VALUE
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MOVE BOUNDS+BOTTOM(A2),D4
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SUB BOUNDS+TOP(A2),D4 ;HEIGHT := BOUNDS BOT - TOP
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MOVE ROWBYTES(A2),D5 ;GET ROWBYTES
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AND #nuRBMask,D5 ;CLEAR OFF FLAG BITS
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CMP D6,D5 ;IS NEWROW < 8 ?
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BLT.S NOPACK ;=>YES, DON'T UNPACK
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tst.w ROWBYTES(A2) ;bitmap data? <29Mar89 BAL>
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bpl.s UNPACK ;yes, must unpack <29Mar89 BAL>
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cmp.w #16,pixelType(a2) ;DIRECT DATA? <22Jan89 BAL>
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bne.s UNPACK ;NO, UNPACK IT <22Jan89 BAL>
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CMP #1,PACKTYPE(A2) ;IS IT PACKED DIRECT DATA? <16Jun88 BAL>
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beq.s NOPACK ;NO, DONT UNPackBits <16Jun88 BAL>
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MOVEM.L (SP)+,D4-D6/A2-A3 ;RESTORE REGISTERS
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UNLK A6 ;UNLINK AND RETURN
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JMP GetDirectPMData ;let someone else do the work
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UNPACK
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;----------------------------------------------------------------
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;
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; MAKE SURE THE STACK IS ON A LONGWORD BOUNDARY (FOR FAST BUFFERS)
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;
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MOVE.L SP,D1 ;GET THE STACK POINTER
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AND.B #$FC,D1 ;FORCE LONG ALIGNMENT
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MOVE.L D1,SP ;USE IT
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;----------------------------------------------------------------
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;
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; ALLOCATE PACKBUF ON THE STACK
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;
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SUB D5,SP ;SET SIZE OF PACKBUF
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SUB D5,SP ;TO 2*ROWBYTES FOR LONG ALIGNMENT
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MOVE.L SP,PACKBUF(A6) ;POINT TO PACKBUF
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;----------------------------------------------------------------
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;
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; ROWBYTES >= 8, READ THE PACKED BIT/PIXMAP FROM THE PICTURE
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;
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; PACKED FORMAT = [BYTECOUNT][DATA] FOR EACH SCANLINE
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;
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; IF ROWBYTES > 250 THEN BYTECOUNT IS A WORD, ELSE IT IS A BYTE
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;
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MOVE.L A3,DSTPTR(A6) ;INIT DSTPTR
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BRA.S START1 ;GO TO LOOP START
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MORE1 CMP #250,D5 ;IS ROWBYTES > 250?
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BGT.S @1 ;=>YES, GET WORD
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JSR GetUByte ;ELSE GET A BYTE INTO D0
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BRA.S @2 ;=>AND GO GET DATA
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@1 JSR GETWORD ;GET A WORD INTO D0
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@2 MOVE.L PACKBUF(A6),-(SP) ;PUSH ADDR OF BUFFER
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MOVE.L (SP),SRCPTR(A6) ;PUT IN SRCPTR TOO
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MOVE D0,-(SP) ;PUSH BYTECOUNT
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JSR GetPicData ;GET PACKED DATA
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if TheFuture then ; Build only for TheFuture <5>
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cmp.w #AbortPicPlayBackErr,qdErr ;abort if our special error <4>
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beq.s done
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endif
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PEA SRCPTR(A6) ;PUSH VAR SRCPTR
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PEA DSTPTR(A6) ;PUSH VAR DSTPTR
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MOVE D5,-(SP) ;PUSH ROWBYTES
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_UnpackBits ;UNPACK INTO DATA HANDLE
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START1 DBRA D4,MORE1 ;LOOP HEIGHT ROWS
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BRA.S DONE ;CONTINUE
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;
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; ROWBYTES < 8, DON'T USE PACKING
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;
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NOPACK MULU D4,D5 ;BYTECOUNT := HEIGHT * WIDTH
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MOVE.L A3,-(SP) ;PUSH DATA POINTER
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MOVE.L D5,-(SP) ;PUSH BYTECOUNT
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JSR GetBigPicData ;READ BITMAP DATA BITS
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DONE MOVE.L MYDATA(A6),A0 ;GET DATA HANDLE
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;_HUnlock ;AND UNLOCK IT (not this time) <16Jun88 BAL>
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MOVE.L SAVEDSP(A6),SP ;RESTORE STACK POINTER
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MOVEM.L (SP)+,D4-D6/A2-A3 ;RESTORE WORK REGISTERS
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UNLINK PARAMSIZE,'GETPMDAT' ;UNLINK AND RETURN
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GetBigPicData PROC EXPORT ;17Jun88 BAL
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IMPORT GetPicData
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;------------------------------------------------------------------
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;
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; FUNCTION GetBigPicData(dataPtr: QDPtr; byteCount: LONG);
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;
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; This is the same as GetPicData except the byteCount is a long
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;
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partSize EQU $4000
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partShift EQU $E
|
||
|
||
MOVEM.L D7/A3-A4,-(SP) ;save a couple of registers
|
||
|
||
MOVE.L 20(SP),A3 ;get the pointer to data
|
||
MOVE.L 16(SP),A4 ;get data length
|
||
MOVE.L A4,D7 ;copy pointer
|
||
MOVEQ #partShift,D0 ;get a constant for the upcoming shift
|
||
LSR.L D0,D7 ;find the number of 16K "pages"
|
||
BEQ.S LeftOvers ;no, so do the remaining part of the picture
|
||
|
||
@1
|
||
MOVE.L A3,-(SP) ;PUSH DATA POINTER
|
||
MOVE #partSize,-(SP) ;move 16K of data
|
||
JSR GetPicData ;AND CALL GET PROC
|
||
ADD.W #partSize,A3 ;move data start pointer up
|
||
SUB.W #partSize,A4 ;subtract for remainder later
|
||
SUBQ.L #1,D7 ;decrease the number of pages
|
||
BNE.S @1 ;loop for each page
|
||
|
||
LeftOvers
|
||
MOVE.L A3,-(SP) ;PUSH DATA POINTER
|
||
MOVE.W A4,-(SP) ;move remainder
|
||
JSR GetPicData ;AND CALL GET PROC
|
||
|
||
MOVEM.L (SP)+,D7/A3-A4 ;restore registers
|
||
RTD_ 8 ;STRIP PARAMS AND RETURN
|
||
|
||
ENDPROC
|
||
|
||
IF hasCQD THEN
|
||
|
||
; PackWords and UnPackWords linked in from somewhere else.
|
||
|
||
ELSE
|
||
|
||
PackWords PROC EXPORT
|
||
EXPORT UnpackWords
|
||
;---------------------------------------------------------------------
|
||
;
|
||
; PROCEDURE PackWords(VAR srcPtr,dstPtr: Ptr; srcBytes: INTEGER);
|
||
;
|
||
; Packs one scanline of data, compressing equal words.
|
||
; Returns updated srcPtr and dstPtr.
|
||
;
|
||
; Equates for parameters are shared with UnpackWords
|
||
;
|
||
PARAMSIZE EQU 10 ;TOTAL BYTES OF PARAMS
|
||
SRCPTR EQU PARAMSIZE+4-4 ;LONG, VAR
|
||
DSTPTR EQU SRCPTR-4 ;LONG,VAR
|
||
SRCBYTES EQU DSTPTR-2 ;WORD
|
||
DSTBYTES EQU SRCBYTES ;ALIAS
|
||
|
||
MOVEM.L D3-D4/A2,-(SP) ;SAVE REGS
|
||
MOVE #128,D4 ;GET USEFUL VALUE
|
||
MOVE.L SRCPTR+12(SP),A0 ;GET VAR ADDR
|
||
MOVE.L (A0),A0 ;GET SRCPTR ITSELF
|
||
MOVE.L DSTPTR+12(SP),A1 ;GET VAR ADDR
|
||
MOVE.L (A1),A1 ;GET DSTPTR ITSELF
|
||
MOVE SRCBYTES+12(SP),D3 ;GET SRCBYTES
|
||
lsr.w #1,d3 ;make in to word count <BAL 25Mar89>
|
||
SUB #1,D3 ;INIT SRC DBRA COUNT
|
||
BLT DONE ;QUIT IF SRCBYTES <= 0
|
||
GoStart MOVE.w (A0)+,D0 ;GET FIRST word OF SRC <BAL 25Mar89>
|
||
BRA.S START ;AND GO TO LOOP START
|
||
|
||
FILLOP MOVE.w -2(A0),D0 ;PUT SRCDATA IN DO <BAL 25Mar89>
|
||
SUB A0,D2 ;COMPUTE FILLOP
|
||
asr.w #1,d2 ;make into word cnt
|
||
ADD D2,D3 ;UPDATE wordCOUNT
|
||
ADD #1,D2 ;-2..-128 -> -1..-127
|
||
MOVE.B D2,(A2) ;STORE FILLOP
|
||
|
||
START MOVEQ #127,D1 ;GET MAX wordCOUNT-1 FOR A RUN
|
||
CMP D4,D3 ;THAT MANY words LEFT?
|
||
BGE.S @1 ;=>YES, DO CHUNK OF 128
|
||
MOVE D3,D1 ;ELSE DO REMAINING BYTES
|
||
|
||
@1 MOVE A0,D2 ;REMEMBER SRCSTART
|
||
MOVE.L A1,A2 ;REMEMBER OPLOC
|
||
CLR.B (A1)+ ;RESERVE ROOM FOR OPCODE
|
||
CMP.w (A0),D0 ;IS NEXT SRC THE SAME ? <BAL 25Mar89>
|
||
BNE.S DOCOPY ;NO, USE COPY LOOP
|
||
CMP.w 2(A0),D0 ;THREE IN A ROW ? <BAL 25Mar89>
|
||
BNE.S DOCOPY ;NO, USE COPY LOOP
|
||
BRA.S DOFILL ;YES, USE FILL LOOP
|
||
|
||
NXTCOPY MOVE.w (A0)+,D0 ;GET word OF SRC <BAL 25Mar89>
|
||
CMP.w (A0),D0 ;IS THE NEXT THE SAME ? <BAL 25Mar89>
|
||
BNE.S DOCOPY ;NO, CONTINUE
|
||
CMP.w 2(A0),D0 ;THREE IN A ROW ? <BAL 25Mar89>
|
||
BEQ.S COPYOP ;YES, END OF COPY RUN
|
||
DOCOPY MOVE.w D0,(A1)+ ;COPY DATA TO DST <BAL 25Mar89>
|
||
DBRA D1,NXTCOPY ;AND LOOP FOR MORE
|
||
|
||
ENDCOPY SUB A0,D2 ;COMPUTE COPYOP
|
||
NEG D2 ;NEGATE ONLY
|
||
asr.w #1,d2 ;make word count <BAL 25Mar89>
|
||
MOVE.B D2,(A2) ;INSTALL COPYOP
|
||
SUB D4,D3 ;SUBTRACT NEXT CHUNK
|
||
BPL.S GoStart ;=>MORE TO DO, CONTINUE
|
||
BRA.S DONE ;AND QUIT
|
||
|
||
COPYOP TST D1 ;IS THIS THE LAST SRC BYTE ?
|
||
BEQ DOCOPY ;YES, FINISH OFF COPY RUN
|
||
SUB A0,D2 ;COMPUTE COPYOP
|
||
asr.w #1,d2 ;make word count <BAL 25Mar89>
|
||
ADD D2,D3 ;UPDATE BYTECOUNT
|
||
NOT D2 ;NEGATE AND SUBTRACT 1
|
||
MOVE.B D2,(A2) ;STORE COPYOP
|
||
|
||
MOVEQ #127,D1 ;GET MAX BYTECOUNT FOR A RUN
|
||
CMP D4,D3 ;THAT MANY BYTES LEFT?
|
||
BGE.S @1 ;=>YES, DO CHUNK OF 128
|
||
MOVE D3,D1 ;ELSE DO REMAINING BYTES
|
||
|
||
@1 MOVE.L A0,D2 ;REMEMBER SRCSTART
|
||
MOVE.L A1,A2 ;REMEMBER OPLOC
|
||
CLR.B (A1)+ ;RESERVE ROOM FOR OPCODE
|
||
|
||
DOFILL MOVE.w D0,(A1)+ ;COPY THE DATA word <BAL 25Mar89>
|
||
NXTFILL CMP.w (A0)+,D0 ;IS NEXT word THE SAME ? <BAL 25Mar89>
|
||
DBNE D1,NXTFILL ;LOOP TILL NOT SAME OR END SRC
|
||
BEQ.S ENDFILL ;BRANCH IF SRC EXHAUSTED
|
||
SUB #1,D1 ;COMPENSATE FOR DBNE DIDNT SUB
|
||
BGE FILLOP ;BR IF SRC NOT EXHAUSTED
|
||
|
||
ENDFILL SUB #2,A0 ;BACK UP FOR LAST word COMPARED <BAL 25Mar89>
|
||
SUB A0,D2 ;COMPUTE FILLOP
|
||
asr.w #1,d2 ;make word count <BAL 25Mar89>
|
||
MOVE.B D2,(A2) ;INSTALL FILLOP
|
||
SUB D4,D3 ;SUBTRACT NEXT CHUNK
|
||
BPL.S GoStart ;=>MORE TO DO, CONTINUE
|
||
|
||
DONE CLR.L D0 ;GET READY FOR WORD
|
||
MOVE SRCBYTES+12(SP),D0 ;GET SRCBYTES
|
||
MOVE.L SRCPTR+12(SP),A0 ;GET VAR ADDR OF SRCPTR
|
||
ADD.L D0,(A0) ;BUMP SRCPTR
|
||
MOVE.L DSTPTR+12(SP),A2 ;GET VAR ADDR OF DSTPTR
|
||
MOVE.L A1,(A2) ;UPDATE DSTPTR
|
||
MOVEM.L (SP)+,D3-D4/A2 ;RESTORE REGS
|
||
SHARE MOVE.L (SP)+,A0 ;POP RETURN ADDR
|
||
ADD #PARAMSIZE,SP ;STRIP PARAMS
|
||
JMP (A0) ;AND RETURN
|
||
|
||
|
||
;--------------------------------------------------------
|
||
;
|
||
; PROCEDURE UnpackWords(VAR srcPtr,dstPtr: Ptr; dstBytes: INTEGER);
|
||
;
|
||
; Unpacks one scanline of data, as compressed by PackWords.
|
||
; Returns updated srcPtr and dstPtr.
|
||
;
|
||
; Equates for parameters are the same as PackWords!
|
||
;
|
||
UnpackWords
|
||
MOVE.L SRCPTR(SP),A0 ;GET ADDR OF SRCPTR
|
||
MOVE.L (A0),A0 ;GET SRCPTR ITSELF
|
||
MOVE.L DSTPTR(SP),A1 ;GET ADDR OF DSTPTR
|
||
MOVE.L (A1),A1 ;GET DSTPTR ITSELF
|
||
MOVE DSTBYTES(SP),D2 ;GET DSTBYTES
|
||
EXT.L D2 ;MAKE IT LONG
|
||
ADD.L A1,D2 ;LIMIT := DSTPTR + BYTECOUNT
|
||
BRA.S @3 ;GO TO LOOP START
|
||
@1 EXT.W D1 ;CLEAR HI BYTE OF COUNT
|
||
@2 MOVE.b (A0)+,(A1)+ ;COPY A word OF DATA <BAL 25Mar89>
|
||
MOVE.b (A0)+,(A1)+ ;COPY A word OF DATA <KON 6Sept89>
|
||
DBRA D1,@2 ;LOOP ALL COPY words
|
||
@3 CMP.L D2,A1 ;IS DSTPTR >= LIMIT ?
|
||
BHS.S @5 ;YES, WE'RE DONE
|
||
MOVE.B (A0)+,D1 ;NO, GET OPCODE
|
||
BPL.S @1 ;0..127 --> COPY 1..128 BYTES
|
||
NEG.B D1 ;-1..-127 --> FILL 2..128 BYTES
|
||
BVS.S @3 ;IGNORE $80 FOR BACKWARD COMPAT
|
||
EXT.W D1 ;CLEAR HI BYTE OF COUNT
|
||
MOVE.b (A0)+,D0 ;GET FILL DATA <BAL 25Mar89>
|
||
lsl #8,d0 ;we could be on an odd address...<KON 6Sept89>
|
||
or.b (a0)+,d0 ;... so move two bytes <KON 6Sept89>
|
||
@4 MOVE.w D0,(A1)+ ;COPY IT TO DST <BAL 25Mar89>
|
||
DBRA D1,@4 ;LOOP ALL FILL words
|
||
BRA.S @3 ;THEN GET NEXT OPCODE
|
||
@5 MOVE.L A0,D0 ;STASH SRCPTR
|
||
MOVE.L SRCPTR(SP),A0 ;GET VAR ADDR
|
||
MOVE.L D0,(A0) ;UPDATE VAR SRCPTR
|
||
MOVE.L DSTPTR(SP),A0 ;GET VAR ADDR
|
||
MOVE.L A1,(A0) ;UPDATE VAR DSTPTR
|
||
BRA.S SHARE
|
||
|
||
ENDPROC
|
||
|
||
;-------------------- END OF Pack and UnPack Words ----------------
|
||
|
||
ENDIF ;hasCQD
|