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boot3/QuickDraw/Classic/Patterns.m.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: Patterns.m.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: © 1988-1990 by Apple Computer, Inc., all rights reserved.
;
; Change History (most recent first):
;
; <2> 7/20/90 gbm Change some id's to avoid conflicts
; <1.1> 11/11/88 CCH Fixed Header.
; <1.0> 11/9/88 CCH Adding to EASE.
; <1.1> 5/18/88 MSH Changed inclides to use m.GRAPHTYPES to work under EASE.
; <1.0> 2/11/88 BBM Adding file for the first time into EASEÉ
;
; To Do:
;
;EASE$$$ READ ONLY COPY of file Òpatterns.m.aÓ
; 1.1 CCH 11/11/1988 Fixed Header.
; 1.0 CCH 11/ 9/1988 Adding to EASE.
; OLD REVISIONS BELOW
; 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
MACHINE MC68020
LOAD 'systlqk.d'
INCLUDE 'newequ.a'
INCLUDE 'colorequ.a'
;------------------------------------------------------------------
;
; --> PATTERNS.A
;
; Routines for manipulating color Patterns
;
;------------------------------------------------------------------
;
; NOTES: In the old world, patterns were always drawn using the
; foreground and background colors. New patterns can have more
; colors in them, and need to be created with CSubTables that indicate
; the intended colors. When used in old drawing modes, the fg and bk
; colors must be shoved into the tables (or simply used when the pat
; is expanded). In new drawing modes, the new colors can be used.
GETPIXPAT PROC EXPORT
IMPORT NEWPIXPAT,COPYPIXPAT
;-------------------------------------------------------------
;
; FUNCTION GetPixPat(CPatID: INTEGER): PixPatHandle;
;
; GetPixPat gets a resource of type 'PPAT' with the specified ID, places
; all the data fields into handles, installs the handles into the PPAT,
; resizes it, and then returns the data structure as a pixPatHandle.
;
; The resource format consists of a pixPat followed by it's pixMap, the
; pixel data and finally the color table data. The pixPat field contains
; an offset to the pixel data from the beginning of the resource data. The patData
; field contains the offset to the pixel data from the beginning of the res data.
; The pmTable field contains the offset to the color table data from the beginning
; of the resource data. The size of the pixel data is calculated by
; subtracting the offset to the pixel data from the offset to the color table data.
;
PARAMSIZE EQU 4
RESULT EQU PARAMSIZE+8 ; pixPatHandle RESULT
PPatID EQU PARAMSIZE+8-4 ; pattern ID
LINK A6,#0 ; build stack frame
MOVEM.L A2-A3,-(SP) ; preserve a work register
CLR.L RESULT(A6) ; set result to NIL
SUBQ #4,SP ; make space for result
MOVE.L #'PPAT',-(SP) ; push resource class 'CPAT'
MOVE.W PPatID(A6),-(SP) ; push pattern ID
_GetResource ; get the resource
MOVE.L (SP)+,A3 ; keep handle in A3
MOVE.L A3,D0 ; did we get one?
BEQ.S NoGetNew ; if not, don't allocate one
MOVE.L A3,-(SP) ; push CPAT handle
_DetachResource ; disconnect from resource manager
MOVE.L A3,A0 ; else get the handle
_HLock ; and lock it down
; Create the pixMap handle and install it
MOVE.L (A3),A2 ; point to the resource data
MOVE.L A2,A0 ; point to the resource data
ADD.L patMap(A2),A0 ; get pointer to pixMap data
MOVEQ #PMRec,D0 ; get size of pixMap
_PtrToHand ; go get a new handle
MOVE.L A0,patMap(A2) ; install handle
; Create the color table and install it
MOVE.L A2,A0 ; point to the resource data
ADD.L PPRec+pmTable(A2),A0 ; point to the table data
MOVE CTSize(A0),D0 ; get number of entries in table
ADDQ #1,D0 ; make it one based
LSL #3,D0 ; 8 bytes per entry
ADD #CTRec,D0 ; add in size of header
EXT.L D0 ; long for PtrToHand
_PtrToHand ; go get a new handle
MOVE.L patMap(A2),A1 ; get the pixMap handle
MOVE.L (A1),A1 ; point to the pixMap
MOVE.L A0,pmTable(A1) ; install handle
; Create the pixel data handle and install it
MOVE.L A2,A0 ; point to the resource data
MOVE.L PPRec+pmTable(A2),D0 ; get offset to color table data
SUB.L patData(A2),D0 ; subtract offset to pixel data
ADD.L patData(A2),A0 ; get address of pixel data
_PtrToHand ; go get a new handle
MOVE.L A0,patData(A2) ; install handle
; Allocate a dummy handle for expanded data and install it
MOVEQ #2,D0 ; get a dummy size
_NewHandle ; go get a handle
MOVE.L A0,patXData(A2) ; install handle
MOVE.L A3,A0 ; get the pixPat handle
_HUnlock ; and unlock it
MOVEQ #PPRec,D0 ; get size of pixPat
MOVE.L A3,A0 ; get handle to pixPat
_SetHandleSize ; and strip off the old data
MOVE.L A3,RESULT(A6) ; update function result
NoGetNew MOVEM.L (SP)+,A2-A3 ; restore working registers
UNLINK PARAMSIZE,'GETPIXPA' ; strip params and return
NEWPIXPAT PROC EXPORT
IMPORT NEWHANDLE,NEWPIXMAP
;-------------------------------------------------------------
;
; FUNCTION NewPixPat : PixPatHandle;
;
; Create a new, uninitialized pixel pattern and return a handle to it.
; The pixPat's pixMap is initialized to the current depth.
;
CLR.L -(SP) ; make room for function result
MOVE #PPREC,-(SP) ; get size of pixelpat
JSR NEWHANDLE ; allocate pixel pattern,leave on stack
CLR.L -(SP) ; make room for function result
JSR NEWPIXMAP ; get initialized pixMap, leave on stack
MOVE.L (SP),A0 ; get the handle
CLR.L -(SP) ; make room for function result
CLR.W -(SP) ; size = 0
JSR NEWHANDLE ; get handle for pattern data
CLR.L -(SP) ; make room for function result
CLR.W -(SP) ; size = 0
JSR NEWHANDLE ; get handle for expanded data
MOVE.L (SP)+,D2 ; get expanded data handle
MOVE.L (SP)+,D1 ; get pattern data handle
MOVE.L (SP)+,D0 ; get pixMap handle
MOVE.L (SP)+,A1 ; get pixel pat handle
MOVE.L A1,4(SP) ; return result
MOVE.L (A1),A0 ; get pixel pat pointer
MOVE.L D0,patMap(A0) ; install pixMap into pixPat
MOVE.L D1,patData(A0) ; install handle for data
MOVE.L D2,patXData(A0) ; install handle for expanded data
MOVE #1,patType(A0) ; assume it's a color type
MOVEQ #-1,D0 ; get an invalid shift amount
MOVE D0,lastShift(A0) ; make lastshift invalid
RTS ; and return
DisposPixPat PROC EXPORT
IMPORT DisposPixMap
;-------------------------------------------------------------
;
; PROCEDURE DisposPixPat (PPH: PixPatHandle);
;
; Dispose of a pixel pattern
;
MOVE.L 4(SP),A1 ; get pixPat handle
MOVE.L (A1),A1 ; get pixPat pointer
MOVE.L patData(A1),A0 ; get handle to data
_DisposHandle ; and dispose of them
MOVE.L patXData(A1),A0 ; get handle to expanded data
_DisposHandle ; and Close them too
MOVE.L patMap(A1),-(SP) ; get the pixMap
JSR DisposPixMap ; and dispose of it
MOVE.L 4(SP),A0 ; get handle to pixPat
_DisposHandle ; and dispose of it
MOVE.L (SP)+,(SP) ; strip parameter
RTS ; and return
PenPixPat PROC EXPORT
EXPORT BackPixPat
IMPORT DISPOSPIXPAT,PATCONVERT
;-------------------------------------------------------------
;
; PROCEDURE PenPixPat (PPH: PixPatHandle);
;
; SET THE PNPAT TO THE SPECIFIED PIXEL PATTERN
MOVE #PNPIXPAT,D0 ;GET OFFSET TO PATTERN
BRA.S CPATSHARE
BackPixPat
;-------------------------------------------------------------
;
; PROCEDURE BackPixPat (PPH: PixPatHandle);
;
; SET THE BKPAT TO THE SPECIFIED PIXEL PATTERN
MOVE #BKPIXPAT,D0 ;GET OFFSET TO PATTERN
CPATSHARE MOVE.L GRAFGLOBALS(A5),A0 ;GET GLOBAL POINTER
MOVE.L THEPORT(A0),A0 ;GET THE PORT
TST PORTBITS+ROWBYTES(A0) ;IS IT A COLOR PORT?
BPL.S DONE ;=>NO, JUST EXIT
; IF NO PATTERN OR NEW PATTERN, JUST INSTALL SPECIFIED PATTERN
MOVE.L 0(A0,D0),D1 ;GET WHAT IS CURRENTLY THERE
BEQ.S PUTPAT ;=>NOTHING, JUST PUT NEW ONE
MOVE.L D1,A0 ;GET THE PATTERN HANDLE
MOVE.L (A0),A0 ;GET THE PATTERN POINTER
TST PATTYPE(A0) ;OLD OR NEW PATTERN?
BNE.S PUTPAT ;=>NEW ONE, JUST PUT NEW ONE
; IF PREVIOUS PNPAT WAS AN OLD PATTERN, THEN DISPOSE OF IT
MOVE D0,-(SP) ;SAVE PATTERN OFFSET
MOVE.L D1,-(SP) ;PUSH THE HANDLE
JSR DISPOSPIXPAT ;AND DISPOSE OF THE PIXPAT
MOVE (SP)+,D0 ;RESTORE PATTERN OFFSET
; INSTALL SPECIFIED HANDLE AND RETURN
PUTPAT MOVE.L GRAFGLOBALS(A5),A0 ;GET GLOBAL POINTER
MOVE.L THEPORT(A0),A0 ;GET THE PORT
MOVE.L 4(SP),-(SP) ;PUSH HANDLE FOR PATCONVERT
MOVE.L (SP),0(A0,D0) ;INSTALL HANDLE INTO PORT
JSR PATCONVERT ;EXPAND PATTERN/TRANSLATE TABLE
DONE MOVE.L (SP)+,(SP) ;STRIP PARAMETER
RTS ;AND RETURN
COPYPIXPAT PROC EXPORT
IMPORT COPYPIXMAP,COPYHANDLE
;-------------------------------------------------------------
;
; PROCEDURE COPYPIXPAT (SRCPP,DSTPP: PixPatHandle);
;
; COPY THE SRC PIXPAT'S DATA TO THE DST PIXPAT'S HANDLES
;
PARAMSIZE EQU 8
SRCPP EQU PARAMSIZE
DSTPP EQU SRCPP-4
MOVE.L SRCPP(SP),A0 ;GET HANDLE TO SRC PIXPAT
MOVE.L (A0),A0 ;GET POINTER TO SRC PIXPAT
MOVE.L DSTPP(SP),A1 ;GET HANDLE TO DST PIXPAT
MOVE.L (A1),A1 ;GET POINTER TO DST PIXPAT
MOVE (A0)+,(A1)+ ;COPY PATTYPE
MOVE.L (A0)+,-(SP) ;PUSH SRC PATMAP
MOVE.L (A1)+,-(SP) ;PUSH DST PATMAP
MOVE.L (A0)+,-(SP) ;PUSH SRC DATA
MOVE.L (A1)+,-(SP) ;PUSH DST DATA
MOVE.L (A0)+,-(SP) ;PUSH SRC EXPAND DATA
MOVE.L (A1)+,-(SP) ;PUSH DST EXPAND DATA
MOVE.L (A0)+,(A1)+ ;COPY PATXHMASK, PATXVMASK
MOVE.L (A0)+,(A1)+ ;COPY LASTOFST, LASTSHIFT
MOVE.L (A0)+,(A1)+ ;COPY LASTINVERT
MOVE.L (A0)+,(A1)+ ;COPY LASTALIGN
MOVE (A0)+,(A1)+ ;COPY LASTSTRETCH
JSR COPYHANDLE ;COPY EXPAND DATA
JSR COPYHANDLE ;COPY DATA
JSR COPYPIXMAP ;COPY PATMAP
MOVE.L (SP)+,A0 ;GET RETURN ADDRESS
ADDQ #8,SP ;STRIP PARAMS
JMP (A0) ;AND RETURN
OldPatToNew PROC EXPORT
IMPORT OneBitCTable,COPYPMAP,OneBitData
;-------------------------------------------------------------
;
; PROCEDURE OldPatToNew (pat: pattern; PPHP: PixPatHandlePtr);
;
; Copy the specified pattern into a pixPat.
; If the pixPat handle is NIL, then create a new pixPat.
; If the handle contains a new pattern, create a new pixPat and replace it.
; If the handle contains an old-style pattern, then re-use it.
;
; NOTE: This structure is invalid as a pixMap. There is no BaseAddr
; and the rowBytes is set to one (should be multiple of 2).
;
; The data will be tweaked to transform it into a valid pixMap before
; drawing takes place.
;
; NOTE: WE ASSUME THAT THE PAT IS A POINTER THAT WILL NOT MOVE.
;
PARAMSIZE EQU 8 ; total bytes of params
PAT EQU PARAMSIZE+8-4 ; pattern pointer
PPHP EQU PAT-4 ; pixPat handle
LINK A6,#0 ; no local vars
MOVEM.L A2/A3,-(SP) ; save work registers
MOVE.L PPHP(A6),A0 ; get handle pointer
MOVE.L (A0),D0 ; is there a handle?
BEQ.S GetHandle ; => no, go get one
MOVE.L D0,A3 ; get the pixpat handle
MOVE.L (A3),A1 ; point to pixpat
TST PatType(A1) ; is it an old one?
BEQ.S GotHandle ; =>yes, just reuse it
; IF THERE WAS NO PIXPAT HANDLE, CREATE ONE AND INSTALL IT IN PPHP
GetHandle CLR.L -(SP) ; make room for a handle
JSR NewPixPat ; create a new one
MOVE.L PPHP(A6),A0 ; get handle pointer
MOVE.L (SP)+,(A0) ; return new handle
MOVE.L (A0),A3 ; get the pixpat handle
MOVE.L (A3),A1 ; point to pixpat
; CLEAR PATTYPE TO SAY THAT IT IS A FOREGROUND/BACKGROUND PATTERN
; INVALIDATE THE CURRENT PATTERN EXPAND AREA BY SETTING LASTSHIFT TO -1
GotHandle CLR PATTYPE(A1) ; IT'S A FG/BK PATTERN
MOVEQ #-1,D0 ; INVAL ALL SAVE VARS
MOVE D0,LASTSHIFT(A1) ; INVAL LASTSHIFT
MOVE.L patData(A1),A0 ; finally get the data handle
MOVEQ #8,D0 ; get size
_SetHandleSize ; for an 8*8 pattern
MOVE.L (A0),A0 ; get pointer to data
MOVE.L PAT(A6),A1 ; get pattern data
MOVE.L (A1)+,(A0)+ ; put one long
MOVE.L (A1)+,(A0)+ ; and second long of pattern
MOVE.L (A3),A2 ; get PixPat pointer
MOVE.L patMap(A2),A2 ; get pixMap handle
MOVE.L (A2),A2 ; A2 is pixMap pointer
MOVE.L A2,A3 ; A3 is pixMap pointer
MOVE.L pmTable(A3),-(SP) ; save color table
LEA OneBitData,A1 ; point to one bit data
JSR CopyPMap ; and copy into pixMap ptr in A2
; clobbers A1, A2
MOVE.W #1,pRowBytes(A3) ; 1 byte per row (not a valid pixMap)
CLR.L pBounds+topLeft(A3) ; bounds = (0,0,8,8)
MOVE.L #$00080008,pBounds+botRight(A3)
MOVE.L (SP),pmTable(A3) ; restore the color table
; and leave on stack as param
JSR OneBitCTable ; get a color table
MOVEM.L (SP)+,A2/A3 ; restore work registers
UNLINK PARAMSIZE,'OLDPATTO' ; strip params and return
PatExpand PROC EXPORT
IMPORT EXTBL1
;----------------------------------------------------------
;
; EXPAND THE CURRENT PATTERN IF NECESSARY
;
; CALLED ONLY FROM STRETCH,DRAWLINE,DRAWARC.
;
; INPUTS: LOCMODE(A6) ;THE (ALTERED) DRAWING MODE
; DSTPIX+BOUNDS+LEFT(A6) ;THE GLOBAL-LOCAL OFFSET (PIXELS)
; FCOLOR(A6) ;THE CURRENT FG COLOR
; BCOLOR(A6) ;THE CURRENT BK COLOR
; DSTSHIFT(A6) ;THE SHIFT FOR PIXEL DEPTH
; LOCPAT(A6) ;THE (ALTERED) PATTERN
; NEWPATTERN(A6) ;TRUE IF NEW PATTERN
; A5: PASCAL GLOBAL PTR
; D7: -1 TO INVERT, ELSE 0
; patStretch AND PATALIGN
;
; OUTPUTS: POINTER TO EXPANDED PATTERN IN EXPAT(A6)
;
; CLOBBERS: D0,D1,D2,A0,A1
;
; DRAWING WITH COLOR PATTERNS:
;
; IF COPY MODE, COLOR IS ADDED TO THE PATTERN IN THIS ROUTINE AND THEN LATER
; BLITTED DIRECTLY TO THE SCREEN (FOR SPEED). OTHERWISE THE PATTERN IS LEFT AS A
; FOREGROUND/BACKGROUND MASK AND COLOR IS ADDED WITHIN THE BLT ROUTINE IF
; NECESSARY. IF XOR MODE, THE DST IS SIMPLY XOR'D AND THE COLORS ARE IGNORED.
; IF OR MODE, THE FOREGROUND COLOR IS APPLIED TO THE PATTERN AND OR'D INTO THE
; DST. IF BIC MODE, THE BACKGROUND COLOR IS APPLIED TO THE PATTERN AND OR'D INTO
; THE DST.
;
; A6 OFFSETS OF LOCAL VARIABLES OF CALLER:
;
; STACK FRAME VARS USED BY SEEKMASK (CALLED BY STRETCHBITS, RGNBLT, DRAWARC, DRAWLINE)
; NOT USED IN PATEXPAND.
;
RECTFLAG EQU -2 ;WORD
VERT EQU RECTFLAG-2 ;WORD
MASKBUF EQU VERT-4 ;LONG
BUFLEFT EQU MASKBUF-2 ;WORD
BUFSIZE EQU BUFLEFT-2 ;WORD
EXRTN EQU BUFSIZE-4 ;LONG
SEEKMASK EQU EXRTN-4 ;LONG
STATEA EQU SEEKMASK-RGNREC ;RGN STATE RECORD
STATEB EQU STATEA-RGNREC ;RGN STATE RECORD
STATEC EQU STATEB-RGNREC ;RGN STATE RECORD
; STACK FRAME VARS USED BY PATEXPAND
; (CALLED BY STRETCHBITS, RGNBLT, BITBLT, DRAWARC, DRAWLINE)
EXPAT EQU STATEC-4 ;LONG
PATVMASK EQU EXPAT-2 ;WORD
PATHMASK EQU PATVMASK-2 ;WORD
PATROW EQU PATHMASK-2 ;WORD
PATHPOS EQU PATROW-2 ;WORD
PATVPOS EQU PATHPOS-2 ;WORD
LOCMODE EQU PATVPOS-2 ;WORD
NEWPATTERN EQU LOCMODE-2 ;WORD
LOCPAT EQU NEWPATTERN-4 ;LONG
FCOLOR EQU LOCPAT-4 ;LONG
BCOLOR EQU FCOLOR-4 ;LONG
DSTPIX EQU BCOLOR-PMREC ;PIXMAP
DSTSHIFT EQU DSTPIX-2 ;WORD
PARAMSIZE EQU 0
TWOPAT EQU -16 ;ROOM FOR TWO COPIES OF PAT
SAVESTK EQU TWOPAT-4 ;ROOM TO SAVE STACK POINTER
ROTSIZE EQU SAVESTK-2 ;SCANLINE SIZE FOR ROTATION
ROTSHIFT EQU ROTSIZE-2 ;ROTATE AMOUNT
VARSIZE EQU ROTSHIFT ;TOTAL BYTES OF LOCAL VARS
;------------------------------------------------------------------
;
; IF OLD PATTERN, ALLOCATE A BUFFER ON THE STACK AND POINT TO IT.
; IF NEW PATTERN, GO EXPAND IF NECESSARY.
;
TST.B NEWPATTERN(A6) ;IS IT A NEW PATTERN?
BNE NEWPATEXPAND ;=>YES, EXPAND PIXELPAT
; ALLOCATE AN EXPAND BUFFER ON THE STACK FOR USE BY CALLER
DOOLD MOVE.L (SP)+,A0 ;GET RETURN ADDRESS
MOVEQ #64,D0 ;MINIMUM BUFFER IS 64 BYTES
MOVE DSTSHIFT(A6),D1 ;GET DEPTH SHIFT
LSR #3,D1 ;DEPTHS 1-8 OK
BEQ.S GETBUF ;=>SO GET THE PATTERN BUFFER
LSL D1,D0 ;ELSE DOUBLE FOR 16, QUAD FOR 32
GETBUF SUB D0,SP ;MAKE THE BUFFER (LONG ALIGNED)
MOVE.L SP,EXPAT(A6) ;POINT TO PATTERN BUFFER
MOVE.L A0,-(SP) ;REPLACE RETURN ADDRESS
PSHARE LINK A4,#VARSIZE ;ALLOCATE STACK FRAME
MOVEM.L D3-D6/A2-A3,-(SP) ;SAVE REGS
MOVE LOCMODE(A6),D0 ;GET MODE
MOVE DSTPIX+BOUNDS+LEFT(A6),D2 ;GET GLOBAL-LOCAL OFFSET (PIXELS)
MOVE.L FCOLOR(A6),D3 ;GET CURRENT FG COLOR
MOVE.L BCOLOR(A6),D4 ;GET CURRENT BK COLOR
MOVE DSTSHIFT(A6),D5 ;GET SHIFT FOR PIXEL DEPTH
MOVE.L LOCPAT(A6),A0 ;GET PATTERN
LEA PATROW(A6),A1 ;AND DATA DST
AND #$F3,D0 ;TURN OFF PAT, INVERT BITS
BEQ.S GOTCOPY ;=>IT'S COPY MODE
MOVEQ #-1,D3 ;ELSE FGCOLOR = BLACK
MOVEQ #0,D4 ;AND BKCOLOR = WHITE
GOTCOPY MOVE.L GRAFGLOBALS(A5),A3 ;POINT TO QUICKDRAW GLOBALS
;
; IF PATALIGN VERT NON-ZERO, COPY PAT TWICE AND REPLACE A0
;
MOVEQ #7,D0
AND PATALIGN(A3),D0 ;GET PATALIGN MOD 8
BEQ.S VERTOK ;SKIP IF ZERO
MOVE.L (A0),TWOPAT(A4) ;MAKE TWO COPIES OF PATTERN
MOVE.L (A0)+,TWOPAT+8(A4)
MOVE.L (A0),TWOPAT+4(A4)
MOVE.L (A0),TWOPAT+12(A4)
LEA TWOPAT(A4),A0
ADD D0,A0
VERTOK ADD PATALIGN+H(A3),D2 ;ADJUST FOR PATALIGN HORIZ
MOVEQ #7,D6 ;SOURCE PAT IS 8 BYTES LONG
AND D6,D2 ;TREAT SHIFTCOUNT MOD 8
TST D5 ;ONE BIT PER PIXEL?
BNE.S NEWWAY ;=>NO, DO NEW WAY
OLDWAY MOVE.L THEPORT(A3),A3 ;GET CURRENT GRAFPORT
MOVE patStretch(A3),D0 ;GET patStretch
CMP #-2,D0 ;IS PAT STRETCH = -2 ?
BEQ.S THIN ;YES, STRETCH THIN
CMP #2,D0 ;IS patStretch = 2 ?
BEQ.S DOUBLE ;=>YES, DOUBLE THE DATA
; NEW WAY: EXPAND DATA TO MINIMUM NEEDED EXPANDED SIZE.
; DEPTH = 1-4: EXPAND 8*8 PATTERN TO 16 ROWS * 1 LONG (USE OLD BLT ROUTINES)
; DEPTH = 8: EXPAND 8*8 PATTERN TO 8 ROWS * 2 LONGS (USE NEW BLT ROUTINES)
; DEPTH = 16: EXPAND 8*8 PATTERN TO 8 ROWS * 4 LONGS
; DEPTH = 32: EXPAND 8*8 PATTERN TO 8 ROWS * 8 LONGS (64 LONGS MAX SIZE)
; EXPAND ROUTINES IN FILE STRETCH.A TO SHARE COMMON TABLES.
NEWWAY LEA EXTBL1,A2 ;POINT TO ROUTINE TABLE
ADD 0(A2,D5*2),A2 ;USE PIXSHIFT TO SELECT ROUTINE
JSR (A2) ;EXPAND DIRECTLY INTO BUFFER
BRA.S DONE ;=>ALL FINISHED
;-----------------------------------------------------------
;
; STRETCHED BY TWO: DOUBLE EACH BIT HORIZONTALLY AND VERTICALLY
;
DOUBLE CLR D0 ;CLEAR OUT HI BYTE
DLOOP MOVE.B (A0)+,D0 ;GET A BYTE OF PATTERN
EOR.B D7,D0 ;INVERT IT IF MODE BIT 2
ROL.B D2,D0 ;ALIGN TO LOCAL COORDS
MOVE.B D0,-(SP) ;STASH FOR A WHILE
LSR.B #4,D0 ;GET HI NIBBLE
MOVE.B STRETCH(D0),(A1)+ ;PUT ONE BYTE
MOVEQ #$F,D0 ;MASK FOR LO NIBBLE
AND.B (SP)+,D0 ;GET THE LO NIBBLE
MOVE.B STRETCH(D0),(A1)+ ;PUT ANOTHER TO MAKE A WORD
MOVE.W -2(A1),(A1)+ ;STRETCH WORD OUT TO LONG
MOVE.L -4(A1),(A1)+ ;STRETCH LONG TO TWO LONGS
DBRA D1,DLOOP ;LOOP ALL 8 INPUT BYTES
BRA.S DONE
;-----------------------------------------------------------
;
; STRETCH BY TWO AND THIN OUT THE BITS. ADD EXTRA WHITE DOTS.
;
THIN CLR D0 ;CLEAR OUT HI BYTE
THINLP MOVE.B (A0)+,D0 ;GET A BYTE OF PATTERN
EOR.B D7,D0 ;INVERT IT IF MODE BIT 2
ROL.B D2,D0 ;ALIGN TO LOCAL COORDS
MOVE.B D0,-(SP) ;STASH FOR A WHILE
LSR.B #4,D0 ;GET HI NIBBLE
MOVE.B THINSTR(D0),(A1)+ ;PUT ONE BYTE
MOVEQ #$F,D0 ;MASK FOR LO NIBBLE
AND.B (SP)+,D0 ;GET THE LO NIBBLE
MOVE.B THINSTR(D0),(A1)+ ;PUT ANOTHER TO MAKE A WORD
MOVE.W -2(A1),(A1)+ ;STRETCH WORD OUT TO LONG
CLR.L (A1)+ ;STRETCH LONG TO TWO LONGS
DBRA D1,THINLP ;LOOP ALL 8 INPUT BYTES
DONE MOVEM.L (SP)+,D3-D6/A2-A3 ;RESTORE REGS
UNLK A4 ;REMOVE STACK FRAME
RTS ;JUST RETURN
;----------------------------------------------------------------
;
; BIT DOUBLING TABLE FOR 0..15 INPUT --> BYTE OUTPUT
;
STRETCH DC.B $00,$03,$0C,$0F,$30,$33,$3C,$3F
DC.B $C0,$C3,$CC,$CF,$F0,$F3,$FC,$FF
;
; TABLE FOR THIN DOUBLING.
;
THINSTR DC.B $00,$01,$04,$05,$10,$11,$14,$15
DC.B $40,$41,$44,$45,$50,$51,$54,$55
NEWPATEXPAND
;----------------------------------------------------------------
;
; NEWPATEXPAND -- EXPAND A PIXELPAT, IF NECESSARY
;
LINK A4,#VARSIZE ;ALLOCATE STACK FRAME
MOVEM.L D3-D6/A2-A3,-(SP) ;SAVE REGS
MOVE.L SP,SAVESTK(A4) ;SAVE STACK POINTER
MOVE.L GRAFGLOBALS(A5),A3 ;POINT TO QUICKDRAW GLOBALS
MOVE.L LOCPAT(A6),A0 ;GET THE PIXPAT HANDLE POINTER
MOVE.L (A0),A0 ;GET THE PIXPAT HANDLE
MOVE.L (A0),A0 ;GET THE PIXPAT POINTER
TST PATTYPE(A0) ;IS IT AN OLD PATTERN?
BNE.S NOTOLD ;=>NO, CHECK FOR EXPANSION OF NEW PAT
;---------------------------------------------------------
;
; IF OLD PATTERN, USE SHARED CODE TO EXPAND IT
;
MOVE.L PATXDATA(A0),A0 ;GET THE EXPANDED DATA HANDLE
MOVEQ #64,D0 ;MINIMUM BUFFER IS 64 BYTES
MOVE DSTSHIFT(A6),D1 ;GET DEPTH SHIFT
LSR #3,D1 ;DEPTHS 1-8 OK
BEQ.S BUFOK ;=>SO GET THE PATTERN BUFFER
LSL.L D1,D0 ;ELSE DOUBLE FOR 16, QUAD FOR 32
BUFOK _SETHANDLESIZE
MOVE.L (A0),EXPAT(A6) ;SAVE POINTER TO EXPAND DATA AREA
;*** LEAVE IT UNLOCKED
MOVE.L LOCPAT(A6),A0 ;GET PIXPAT HANDLE POINTER
MOVE.L A0,-(SP) ;SAVE PIXPAT HANDLE POINTER
MOVE.L (A0),A0 ;GET HANDLE TO PIXPAT
MOVE.L (A0),A0 ;GET POINTER TO PIXPAT
MOVE.L PATDATA(A0),A0 ;GET HANDLE TO DATA
MOVE.L (A0),A0 ;GET POINTER TO DATA
MOVE.L A0,LOCPAT(A6) ;SET UP POINTER TO SRC DATA
JSR PSHARE ;AND CALL COMMON CODE
MOVE.L (SP)+,LOCPAT(A6) ;RESTORE PATTERN HANDLE
NEWDONE MOVE.L SAVESTK(A4),SP ;RESTORE STACK POINTER
BRA DONE ;AND RETURN
; CALC STATE VARIABLES FOR STACK FRAME
NOTOLD MOVE.L ([PATXDATA,A0]),EXPAT(A6) ;COPY POINTER TO EXPANDED DATA
MOVE PATXROW(A0),PATROW(A6) ;COPY EXPANDED ROWBYTES
MOVE PATXHMASK(A0),PATHMASK(A6) ;COPY HORIZONTAL MASK
MOVE PATXVMASK(A0),PATVMASK(A6) ;COPY VERTICAL MASK
;---------------------------------------------------------
;
; HAS PATTERN CHANGED SINCE LAST TIME?
;
LEA LASTOFST(A0),A2 ;POINT TO SAVED GLOBAL-LOCAL OFFSET
MOVE.L THEPORT(A3),A1 ;GET CURRENT GRAFPORT
MOVE (A2)+,D0 ;GET LASTOFST
CMP DSTPIX+BOUNDS+LEFT(A6),D0 ;HAS IT CHANGED?
BNE.S DOPAT ;=>YES, rotate PATTERN
MOVE (A2)+,D0 ;GET LAST PIXEL SHIFT
CMP DSTSHIFT(A6),D0 ;HAS DEPTH CHANGED?
; BNE.S DOPAT ;=>YES, EXPAND PATTERN
CMP.L (A2)+,D7 ;HAS INVERT CHANGED?
; BNE.S DOPAT ;=>YES, EXPAND PATTERN
MOVE PATALIGN+V(A3),D0 ;GET ALIGN VERTICAL
CMP (A2)+,D0 ;HAS IT CHANGED?
; BNE.S DOPAT ;=>YES, EXPAND PATTERN
MOVE PATALIGN+H(A3),D0 ;GET ALIGN HORIZONTAL
CMP (A2)+,D0 ;HAS IT CHANGED?
BNE.S DOPAT ;=>ROTATE WITH ALIGN
; MOVE PATSTRETCH(A1),D0 ;GET STRETCH
; CMP (A2)+,D0 ;HAS IT CHANGED?
BEQ DONE ;=>NO, JUST RETURN
SAVESTATE
LEA LASTOFST(A0),A2 ;POINT TO START OF SAVE AREA
ADDQ #2,A2 ;LASTOFST ALREADY UPDATED
MOVE DSTSHIFT(A6),(A2)+ ;UPDATE LASTSHIFT
MOVE.L D7,(A2)+ ;SAVE INVERT
MOVE.L PATALIGN(A3),(A2)+ ;SAVE LASTALIGN
MOVE PATSTRETCH(A1),(A2)+ ;SAVE LASTSTRETCH
BRA NEWDONE ;=>STRIP STACK AND RETURN
DOPAT
; GET WIDTH OF PATTERN AND ALLOCATE SCANLINE BUFFER ON STACK
MOVE PATXROW(A0),D0 ;GET ROWBYTES OF EXPANDED PATTERN
BNE.S NOSMALL ;=> NOT AN OLD SIZED PATTERN
MOVEQ #4,D0 ;ELSE ROWBYTES := 4
NOSMALL MOVE.L PATMAP(A0),A1 ;GET THE PATTERN'S PIXMAP HANDLE
MOVE.L (A1),A1 ;POINT TO THE PIXMAP
MOVE DSTSHIFT(A6),D1 ;GET SHIFT FOR PIXEL DEPTH
LSL #3,D0 ;CONVERT BYTES TO BITS
MOVE D0,D3 ;D3 = WIDTH IN BITS
MOVE D0,D4 ;SAVE WIDTH FOR BELOW
LSR D1,D4 ;D4 = WIDTH IN PIXELS
LSR #5,D0 ;CONVERT BITS TO LONGS
NXTLNG0 CLR.L -(SP) ;CLEAR A LONG
DBRA D0,NXTLNG0 ;LOOP UNTIL DONE
; SINCE PATTERN MIGHT ALREADY BE SHIFTED, CALC NEW OFFSET - OLD OFFSET
MOVE DSTPIX+BOUNDS+LEFT(A6),D2 ;GET NEW GLOBAL-LOCAL OFFSET
ADD PATALIGN+H(A3),D2 ;ADD HORIZONTAL ALIGNMENT
MOVE D2,D0 ;SAVE A COPY
SUB LASTOFST(A0),D2 ;SHIFT := NEW OFFSET - OLD OFFSET
MOVE D0,LASTOFST(A0) ;SAVE NEW OFFSET
SUBQ #1,D4 ;GET WIDTH-1 AS MASK
AND D4,D2 ;MASK THE OFFSET
BEQ.S SAVESTATE ;=>SAME ALIGNMENT, RETURN
LSL D1,D2 ;DEPTH*OFFSET = SHIFT AMOUNT
; SET UP ROTATE INFO
MOVE D2,ROTSHIFT(A4) ;SAVE SHIFT AMOUNT
MOVE D3,ROTSIZE(A4) ;SAVE SCANLINE SIZE
MOVE.L PATXDATA(A0),A3 ;GET HANDLE TO EXPANDED DATA
MOVE.L (A3),A3 ;POINT AT EXPANDED DATA
MOVEQ #32,D6 ;GET A USEFUL NUMBER IN D6
MOVEQ #16,D5 ;ASSUME OLD-STYLE PATTERN
TST PATXROW(A0) ;IS IT?
BEQ.S CHKSCAN ;=>YES
MOVE BOUNDS+BOTTOM(A1),D5 ;GET BOTTOM
SUB BOUNDS+TOP(A1),D5 ;GET NUMBER OF SCANS TO DO
BRA.S CHKSCAN ;CHECK FOR INVALID HEIGHTS AND LOOP
; ROTATE NEXT ROW INTO THE SCANLINE BUFFER STARTING AT OFFSET INTO SRC
NXTSCAN MOVE.L SP,A2 ;POINT TO SCANLINE BUFFER
MOVE ROTSIZE(A4),D3 ;GET SIZE OF SCANLINE
MOVE ROTSHIFT(A4),D2 ;GET SHIFT AMOUNT
MOVE D2,D7 ;USE AS START OFFSET INTO SRC
EXT.L D7 ;LONG FOR BFEXTU
SUB D7,D3 ;SCANSIZE-START IS # BITS TO DO
; PART 1: WRITE LONGS UNTIL WE HIT THE END OF THE SRC
NXTLNG1 BFEXTU (A3){D7:0},D0 ;GET 32 BITS OF SRC
ADD.L D6,D7 ;BUMP SRC OFFSET
SUB D6,D3 ;UPDATE NUMBER OF BITS TO DO
BMI.S NOTLONG ;=>IF PAST END, DON'T DO LONG
MOVE.L D0,(A2)+ ;ELSE PUT LONG TO DST
BRA.S NXTLNG1
; PART 2: WRITE THE FRACTIONAL PARTS FROM THE END AND THE START OF THE SRC
NOTLONG MOVE.L D6,D1 ;GET 32
ADD D3,D1 ;GET NUMBER OF LEFTOVER BITS (LONG)
ROL.L D1,D0 ;PUT LEFTOVERS INTO LOW PART OF D0
BFINS D0,(A2){0:D1} ;INSERT BITS FROM END OF SRC
NEG D3 ;GET NUMBER OF BITS TO DO
BFEXTU (A3){0:D3},D0 ;GET THAT MANY BITS
BFINS D0,(A2){D1:D3} ;AND PUT TO DST
ADD.W #4,A2 ;DONE WITH THAT LONG
SUB D3,D2 ;SAY WE'VE DONE THOSE BITS
BLE.S DONESCAN ;=>DONE WITH SCAN (*** NEEDED?)
; PART3: WRITE LONGS UNTIL WE'VE EXHAUSTED ALL SRC BITS.
NXTLNG2 BFEXTU (A3){D3:0},D0 ;GET 32 BITS OF SRC
ADD.L D6,D3 ;GO TO NEXT LONG
SUB D6,D2 ;SAY WE'VE DONE THOSE BITS
BMI.S DONESCAN ;=>COUNT EXHAUSTED, DONE W/SCAN
MOVE.L D0,(A2)+ ;ELSE PUT TO DST
BRA.S NXTLNG2 ;AND LOOP UNTIL DONE
DONESCAN MOVE.L SP,A2 ;POINT TO SCANLINE BUFFER
MOVE ROTSIZE(A4),D0 ;GET NUMBER OF BITS TO DO
SUBQ #1,D0 ;FOR LONG ROUNDING
LSR #5,D0 ;CONVERT TO LONGS
NXTLNG3 MOVE.L (A2)+,(A3)+ ;COPY A LONG
DBRA D0,NXTLNG3 ;LOOP FOR ALL LONGS
CHKSCAN DBRA D5,NXTSCAN ;=>DO NEXT SCANLINE
BRA SAVESTATE ;AND RETURN
PATCONVERT PROC EXPORT
IMPORT GetDevPix,Color2Index,PatDither
;------------------------------------------------------------------
;
; PROCEDURE PATCONVERT (PAT: PixPatHandle);
;
; Convert the specified pattern to the current depth and color table.
;
PARAMSIZE EQU 4
PAT EQU PARAMSIZE+8-4 ; handle to pattern
SAVESTK EQU -4 ; save the stack
WIDCNT EQU SAVESTK-2 ; width of pattern in pixels
HTCNT EQU WIDCNT-2 ; height of pattern in scans
HREPCNT EQU HTCNT-2 ; horizontal repetitions of pattern
VREPCNT EQU HREPCNT-2 ; vertical repetitions of pattern
PATROW EQU VREPCNT-2 ; rowbytes of src pattern
VARSIZE EQU PATROW ; local vars
LINK A6,#VARSIZE ; allocate stack frame
MOVEM.L D3-D7/A0/A2-A4,-(SP) ; save all registers
; A0 saved for SetFillPat
MOVE.L SP,SAVESTK(A6) ; save stack pointer
; get the dst pixel size in D6 and the src pixel size in D7
JSR GetDevPix ; get pointer to GDevice in A0
MOVE PixelSize(A0),D6 ; get dst pixel size
EXT.L D6 ; make long for translate loop
MOVE.L PAT(A6),A4 ; get the PixPat Handle
MOVE.L (A4),A1 ; point to the pixPat
CMP #ditherPat,patType(A1) ; does pat need to be dithered?
BNE.S NoDither ; => no, don't adjust
MOVE.L A4,-(SP) ; push pixPat handle
JSR PatDither ; create best-match dither
MOVE.L (A4),A1 ; point to the pixPat
NoDither CLR lastOfst(A1) ; we're expanding with offset 0
MOVE.L PatMap(A1),A3 ; get the pixmap handle
MOVE.L (A3),A0 ; point to the pixmap
MOVE pixelSize(A0),D7 ; get source pixel size
EXT.L D7 ; make long for translate loop
; set up patXRow, patXHMask, patXVMask
MOVE rowBytes(A0),D0 ; get src rowbytes
AND #RBMask,D0 ; clear flag bits
MOVE D0,patRow(A6) ; save for expand loop
CLR HREPCNT(A6) ; assume no horizontal reps
CLR VREPCNT(A6) ; assume no vertical reps
LEA bounds+right(A0),A2 ; point to end of bounds
MOVE (A2),D4 ; get right
MOVE -(A2),D3 ; get bottom
SUB -(A2),D4 ; get width in pixels in D4
SUB -(A2),D3 ; get height in D3
MOVE D4,D0 ; get src width in pixels
SUBQ #1,D0 ; make it 0 based
MOVE D0,WIDCNT(A6) ; save src width in pixels
MOVE D3,D0 ; get height
SUBQ #1,D0 ; make it 0 based
MOVE D0,HTCNT(A6) ; save src height in pixels
; If the pattern will fit into a long, repeat, if necessary, to fill the whole
; word. Also make the pattern 16 scans high. Set patXRow to 0 to indicate a 32*16 pattern.
MULU D6,D4 ; get dst width in bits
LSR #3,D4 ; convert to bytes
MOVEQ #4,D0 ; we need at least four bytes
DIVU D4,D0 ; get 4 DIV dst rowbytes
CMP #1,D0 ; is it less than one?
BLT.S NOREPS ; => yes, no repetitions
MULU D0,D4 ; multiply rowbytes by rep count
SUBQ #1,D0 ; make HRepCnt 0 based
MOVE D0,HREPCNT(A6) ; and set horizontal rep count
CLR PATXROW(A1) ; flag to use the old blt routines
MOVEQ #16,D0 ; get minimum number of vert lines
DIVU D3,D0 ; get 16 DIV height
CMP #1,D0 ; is it 1 or less?
BLT.S NOREPS ; => yes, no repetitions
MULU D0,D3 ; multiply height by repcount
SUBQ #1,D0 ; make VRepCnt 0 based
MOVE D0,VREPCNT(A6) ; and set vertical rep count
BRA.S REPS ; => patXRow already cleared
NOREPS MOVE D4,patXRow(A1) ; save expanded rowbytes
REPS MOVE D4,D0 ; copy expanded rowBytes
SUBQ #1,D0 ; HMASK := $FFFC AND (rowbytes-1)
AND #$FFFC,D0 ; mask to long boundary
MOVE D0,patXHMask(A1) ; save HMask
MOVE D4,D0 ; get (adjusted) rowbytes
MULU D3,D0 ; VMASK := rowbytes*height - 1
SUBQ #1,D0 ; make it a mask
MOVE D0,patXVMask(A1) ; save VMask
; Calc total size of the dst and set the size of patXData
MOVE D4,D0 ; get (adjusted) width in bytes
MULU D3,D0 ; multiply by (adjusted) height
MOVE.L (A4),A0 ; point to the pixPat
MOVE.L patXData(A0),A0 ; get the handle to expanded bits
_SetHandleSize ; set to proper size
; Allocate pixel translate table
MOVE #127,D0 ; allocate 256 words on stack ***
NXTWORD CLR.L -(SP) ; 0 in case of undefined pixels
DBRA D0,NXTWORD ; repeat until done
CLR.L -(SP) ; allocate VAR colorSpec on stack
CLR.L -(SP)
; Build pixel translate table
MOVE.L (A3),A0 ; get pixMap pointer
MOVE.L PMTable(A0),A3 ; get handle to color table
MOVE.L (A3),A2 ; get pointer to color table
MOVE CTSize(A2),D5 ; get size of table in entries
NXTENTRY MOVE.L (A3),A2 ; get color table pointer
MOVE CTTable+value(A2,D5*8),D4 ; get value of current entry
MOVE.L CTTable+value(A2,D5*8),value(SP) ; copy value, red
MOVE.L CTTable+rgb+green(A2,D5*8),rgb+green(SP) ; copy green,blue
MOVE.L SP,-(SP) ; point to VAR colorSpec
JSR Color2Index ; convert to index
MOVE value(SP),8(SP,D4*2) ; put returned value in table
DBRA D5,NXTENTRY ; => repeat until done
ADDQ #8,SP ; strip VAR colorSpec
; For each pixel, translate and write out
MOVE.L (A4),A1 ; point to the pixPat
MOVE.L patXData(A1),A2 ; get the dst handle
MOVE.L (A2),A2 ; point to the dst
MOVEQ #0,D5 ; position to start of dst
NXTPASS MOVE.L (A4),A1 ; point to the pixPat
MOVE.L patData(A1),A3 ; get the data handle
MOVE.L (A3),A3 ; point to the src data
MOVE HTCNT(A6),D3 ; get number of scans to do
NXTSCAN MOVE HREPCNT(A6),D2 ; get horizontal repeat count
NXTREP MOVEQ #0,D4 ; position to start of src scan
MOVE WIDCNT(A6),D1 ; get width of src
NXTPXL BFEXTU (A3){D4:D7},D0 ; extract a source pixel
MOVE 0(SP,D0*2),D0 ; translate it
BFINS D0,(A2){D5:D6} ; and put to dst
ADD.L D7,D4 ; bump to next src pixel
ADD.L D6,D5 ; bump to next dst pixel
DBRA D1,NXTPXL ; => repeat for each pixel in src
DBRA D2,NXTREP ; => repeat so expanded pat 32 wide
ADD patRow(A6),A3 ; else bump to next scan of src
DBRA D3,NXTSCAN ; => and repeat for each scanline
SUBQ #1,VREPCNT(A6) ; need to repeat vertically?
BPL.S NXTPASS ; => yes, take it from the top
; restore everything and return
MOVE.L SAVESTK(A6),SP ; restore the stack pointer
MOVEM.L (SP)+,D3-D7/A0/A2-A4 ; restore work registers
UNLINK PARAMSIZE,'PATCONVE' ; unlink and return
PatDither PROC EXPORT
IMPORT GetDevPix,Color2Index,Index2Color
;---------------------------------------------------------------
;
; PROCEDURE PatDither (PPH: PixPatHandle);
;
; Called with a pattern of patType = ditherPat (an RGB to be dithered),
; which has the desired RGB as the first entry (entry 0) of its
; color table. This routine finds the best-fit dithered pattern for
; the specified color, and adjusts the pattern data and the second
; entry in the color table so the pattern is ready to be expanded.
; This routine assumes the data and color table are the right size.
PARAMSIZE EQU 4
PPH EQU PARAMSIZE+8-4 ; handle to pattern
MYSPEC EQU -8 ; temporary color spec
BCur EQU MYSPEC-2 ; current delta in blue space
GCur EQU BCur-2 ; current delta in green space
RCur EQU GCur-2 ; current delta in red space
BStep EQU RCur-2 ; step amount in blue space
GStep EQU BStep-2 ; step amount in green space
RStep EQU GStep-2 ; step amount in red space
BestMatch EQU RStep-4 ; quality of best dither found
BestDelta EQU BestMatch-6 ; component deltas for best dither
LastDither EQU BestDelta-6 ; components of last dithered pair
BestDither EQU LastDither-6 ; components of best dithered pair
DesiredRGB EQU BestDither-8 ; RGB desired
compRGB EQU DesiredRGB-8 ; complement of current RGB
curRGB EQU compRGB-8 ; current RGB
saveComp EQU curRGB-8 ; save the best complement
saveCur EQU saveComp-8 ; save the best current
VARSIZE EQU saveCur
LINK A6,#VARSIZE ; allocate stack frame
MOVEM.L D3-D7/A2-A4,-(SP) ; save all registers
; get the color table and lock it down
MOVE.L PPH(A6),A0 ; get the pixPat handle
MOVE.L (A0),A0 ; point at the pixPat
MOVE.L patMap(A0),A3 ; A3 is pixMap handle
MOVE.L (A3),A0 ; point at the pixMap
MOVE.L pmTable(A0),A0 ; get the color table handle
_HLock ; lock while using
MOVE.L (A0),A4 ; A4 is color table pointer
MOVE.L CTTable(A4),DesiredRGB(A6) ; copy desired color
MOVE.L CTTable+4(A4),DesiredRGB+4(A6) ; from color table entry 0
MOVE #$3000,D7 ; get default stepsize
BSR BestTwo ; get best two points describing it
LEA saveCur(A6),A0 ; point to saved curRGB, compRGB
LEA CTTable(A4),A1 ; point to entry 0
MOVEQ #3,D0 ; copy 4 longs
@0 MOVE.L (A0)+,(A1)+ ; copy one long
DBRA D0,@0 ; repeat for curRGB, compRGB
MOVE #0,CTTable(A4) ; set entry number to 0
MOVE #1,CTTable+8(A4) ; set entry number to 1
LEA BestDither+red(A6),A0 ; point to error amounts
LEA DesiredRGB+rgb+red(A6),A1 ; point to desired values
MOVEQ #2,D2 ; repeat for 3 components
GetNext MOVE (A0)+,D0 ; get error for component
EXT.L D0 ; sign extend it
MOVEQ #0,D1 ; get component as positive long
MOVE (A1),D1 ; get desired value
SUB.L D0,D1 ; calc new desired
BMI.S Pin0 ; => it wrapped, pin to 0
BTST #16,D1 ; did it overflow a word?
BEQ.S SetIt ; => no, set desired value
MOVEQ #-1,D1 ; positive overflow, pin to $FFFF
BRA.S SetIt ; => set new desired
Pin0 MOVEQ #0,D1 ; pin to 0
SetIt MOVE D1,(A1)+ ; set new desired
DBRA D2,GetNext ; repeat for each component
MOVE #$2000,D7 ; get default stepsize
BSR BestTwo ; get best two points
LEA saveCur(A6),A0 ; point to saved curRGB, compRGB
LEA CTTable+16(A4),A1 ; start at third entry
MOVEQ #3,D0 ; copy 4 longs
@0 MOVE.L (A0)+,(A1)+ ; copy one long
DBRA D0,@0 ; repeat for curRGB, compRGB
MOVE #2,CTTable+16(A4) ; set entry number to 2
MOVE #3,CTTable+24(A4) ; set entry number to 3
; if entries 0 and 2 are the same, or 1 and 3 are the same, then
; swap entries 2 and 3 to get a better dither pattern
LEA CTTable+rgb(A4),A0 ; point to entry 0
LEA CTTable+16+rgb(A4),A1 ; point to entry 2
CMP.L (A0)+,(A1)+ ; are r,g same?
BNE.S CheckNxt ; =>no, check 1 and 3
CMP (A0)+,(A1)+ ; is b same?
BEQ.S SwapEm ; =>yes, swap 2,3
CheckNxt LEA CTTable+8+rgb(A4),A0 ; point to entry 1
LEA CTTable+24+rgb(A4),A1 ; point to entry 3
CMP.L (A0)+,(A1)+ ; are r,g same?
BNE.S NoSwap ; =>no, check 1 and 3
CMP (A0)+,(A1)+ ; is b same?
BNE.S NoSwap ; =>no, check 1 and 3
SwapEm MOVE #3,CTTable+16(A4) ; set entry number to 3
MOVE #2,CTTable+24(A4) ; set entry number to 2
NoSwap LEA FourPat,A0 ; use 50% pattern
MOVE.L PPH(A6),A4 ; get the pixPat handle
MOVE.L (A4),A1 ; point at the pixPat
MOVE.L patData(A1),A1 ; get the data handle
MOVE.L (A1),A1 ; point at the data
MOVE.L (A0)+,(A1)+ ; copy first quarter of pattern
MOVE.L (A0)+,(A1)+ ; copy second quarter of pattern
MOVE.L (A0)+,(A1)+ ; copy third quarter of pattern
MOVE.L (A0)+,(A1)+ ; copy fourth quarter of pattern
DONE MOVE.L (A3),A0 ; point at the pixMap
MOVE.L pmTable(A0),A0 ; get the color table handle
_HUnlock ; all done with it
MOVEM.L (SP)+,D3-D7/A2-A4 ; restore work registers
UNLINK PARAMSIZE,'DITHERPA' ; unlink and return
FourPat DC.L $1B1BB1B1 ; 8*8 pattern
DC.L $1B1BB1B1 ; two bits per pixel
DC.L $1B1BB1B1 ; pixels 0,1,2,3 repeated
DC.L $1B1BB1B1
BestTwo MOVE.L A3,-(SP) ; save A3
; for each component, determine the points to search. The default is
; desired-$3000, desired, desired+$3000. If the point is near the edge,
; the actual stepsize is adjusted.
LEA RStep(A6),A0 ; and point to steps
MOVE D7,(A0)+ ; init stepsizes
MOVE D7,(A0)+
MOVE D7,(A0)+
LEA DesiredRGB+rgb(A6),A0 ; point to the desired color
LEA RStep(A6),A1 ; point to steps
MOVEQ #2,D2 ; do 3 components
NxtCmp MOVE (A1),D1 ; get default step
MOVE (A0),D0 ; get desired component
ADD D1,D0 ; check cmp in that direction
BCC.S NxtEdge ; =>check next edge
SUB D0,(A1) ; else subtract overflow from delta
SUB #1,(A1) ; pin to $FFFF
BRA.S NotEdge ; =>do next component
NxtEdge MOVE (A0),D0 ; get desired component
SUB D1,D0 ; check cmp in opposite direction
BCC.S NotEdge ; =>not at edge
ADD D0,(A1) ; else add neg overflow to delta
NotEdge ADDQ #2,A0 ; bump desired pointer
ADDQ #2,A1 ; bump step pointer
DBRA D2,NxtCmp ; loop for all 3 components
; the ranges we just set define a cube surrounding the desired RGB in
; color space. What we want to do is to iterate through that cube, and
; determine the quality of dither achieved by pairing each point with its
; complementary point. RStep, GStep, BStep are the search intervals.
MOVEQ #-1,D0 ; get all F's
MOVE.L D0,BestMatch(A6) ; init best match to huge value
MOVE BStep(A6),BCur(A6) ; current blue := starting blue
NxtBlue MOVE GStep(A6),GCur(A6) ; current green := starting green
NxtGreen MOVE RStep(A6),RCur(A6) ; current red := starting red
NxtRed LEA DesiredRGB(A6),A0 ; point to desired color
LEA curRGB(A6),A1 ; point to current color
MOVE.L (A0)+,(A1)+ ; copy red
MOVE.L (A0),(A1)+ ; copy green, blue
SUBQ #4,A0 ; point to desired color
MOVE.L (A0)+,(A1)+ ; copy value, red to comp color
MOVE.L (A0),(A1) ; copy green, blue
LEA RCur(A6),A0 ; point to current delta
LEA curRGB+rgb(A6),A1 ; point to current color
LEA compRGB+rgb(A6),A2 ; point to complementary color
MOVEQ #2,D1 ; do three components
@0 MOVE (A0)+,D0 ; get delta
ADD D0,(A1)+ ; add to current color
SUB D0,(A2)+ ; subtract from complementary color
DBRA D1,@0 ; => repeat for all components
PEA curRGB(A6) ; push current color for Index2Color
MOVE.L (SP),-(SP) ; copy for Color2Index
JSR Color2Index ; get the index for that color
JSR Index2Color ; get the true color
PEA compRGB(A6) ; push complementary color
MOVE.L (SP),-(SP) ; and copy for Color2Index
JSR Color2Index ; get the index for that color
JSR Index2Color ; get the true complementary color
; approximate the quality of the dither based on how close the average of the two colors
; are to the desired color and on how close in color space the two colors are.
LEA curRGB+rgb(A6),A0 ; point to current RGB
LEA compRGB+rgb(A6),A1 ; point to complementary color
LEA DesiredRGB+rgb(A6),A2 ; point to desired color
LEA LastDither(A6),A3 ; place to save last dither
MOVEQ #0,D3 ; dither delta so far
MOVEQ #2,D2 ; do 3 components
NxtDither MOVEQ #0,D0 ; clear high word
MOVE (A0)+,D0 ; get current component
MOVEQ #0,D1 ; clear high word
MOVE (A1)+,D1 ; get current complement
@0 ADD.L D0,D1 ; sum the components
LSR.L #1,D1 ; and divide by 2
MOVEQ #0,D0 ; clear high word
MOVE (A2)+,D0 ; get desired component
SUB.L D0,D1 ; get dither error
MOVE D1,(A3)+ ; save dither error
BPL.S @1 ; => got positive
NEG.L D1 ; get positive error
@1 ADD.L D1,D3 ; add error to dither delta
DBRA D2,NxtDither ; calc dither for each component
; if the dither is the best so far, then record the RGB's
CMP.L BestMatch(A6),D3 ; is it a better match?
BHI.S NotBest ; =>no, keep searching
MOVE.L D3,BestMatch(A6) ; else save new best match
MOVE.L LastDither(A6),BestDither(A6) ; save errors of best dither
MOVE LastDither+4(A6),BestDither+4(A6)
LEA curRGB(A6),A0 ; point to current
LEA saveCur(A6),A1 ; point to save area
MOVEQ #3,D0 ; copy 4 longs
@2 MOVE.L (A0)+,(A1)+ ; copy a long
DBRA D0,@2 ; repeat for curRGB, compRGB
NotBest MOVE RCur(A6),D0 ; get current red
BMI.S AtREnd ; =>done if negative
MOVE RStep(A6),D1 ; get red step
BEQ.S AtREnd ; =>done if step 0
SUB D1,D0 ; step to next position
MOVE D0,RCur(A6) ; else update position
BRA NxtRed ; => go do next red
AtREnd MOVE GCur(A6),D0 ; get current green
BMI.S AtGEnd ; =>done if negative
MOVE GStep(A6),D1 ; get green step
BEQ.S AtGEnd ; =>done if step 0
SUB D1,D0 ; step to next position
MOVE D0,GCur(A6) ; else update position
BRA NxtGreen ; => go do next green
AtGEnd MOVE BCur(A6),D0 ; get current blue
BMI.S AtBEnd ; =>done if negative
MOVE BStep(A6),D1 ; get blue step
BEQ.S AtBEnd ; =>done if step 0
SUB D1,D0 ; step to next position
MOVE D0,BCur(A6) ; else update position
BRA NxtBlue ; => go do next blue
AtBEnd MOVE.L (SP)+,A3 ; restore A3
RTS
MAKERGBPAT PROC EXPORT
IMPORT OneBitData,CopyPMap
;---------------------------------------------------------------
;
; PROCEDURE MakeRGBPat (PPH: PixPatHandle; myRGB: RGBColor);
;
; Alters specified pattern to be type ditherPat (patType = 2).
; Data size is set to 8, and color table made large enough for
; two entries. The first entry is set to the specified RGB.
;
; Note that the dithering is not done here, it is done within
; PatConvert when the pattern is actually set.
;
PARAMSIZE EQU 8
PPH EQU PARAMSIZE+8-4 ; pixPatHandle
myRGB EQU PPH-4 ; RGB
VARSIZE EQU 0 ; no vars
LINK A6,#VARSIZE
MOVEM.L A2-A3,-(SP) ; save work register
MOVE.L PPH(A6),A1 ; get the pix pat handle
MOVE.L (A1),A0 ; point at the pix pat
MOVE #ditherPat,patType(A0) ; set type to ditherPat
MOVE.L patData(A0),A0 ; get the data handle
MOVEQ #16,D0 ; pattern is 16 bytes
_SetHandleSize ; so set the size
MOVE.L (A1),A0 ; point at the pix pat
MOVE.L patMap(A0),A3 ; get the pixMap handle
MOVE.L (A3),A0 ; point at the pix map
MOVE.L pmTable(A0),A0 ; get the color table handle
MOVEQ #CTRec+32,D0 ; size = header + 4 entries
_SetHandleSize ; set color table size
LEA OneBitData,A1 ; point to one bit data
MOVE.L (A3),A2 ; point to the pixMap
JSR CopyPMap ; copy data into pixMap
; clobbers A1, A2 (but not A0)
; also clobbers color table
MOVE.L (A3),A2 ; get back pixMap pointer
MOVE.L A0,pmTable(A2) ; restore color table
MOVE #2,pRowBytes(A2) ; 2 bytes per row
CLR.L pBounds+topLeft(A2) ; bounds = (0,0,8,8)
MOVE.L #$00080008,pBounds+botRight(A2)
MOVE #2,pixelsize(A2) ; two bits per pixel
MOVE.L (A0),A0 ; point at the color table
CLR transIndex(A0) ; clear transIndex
MOVE #3,CTSize(A0) ; say there are 4 entries
ADD #CTRec,A0 ; point at entry 0
MOVE.L myRGB(A6),A1 ; point at the desired color
CLR (A0)+ ; clear value field
MOVE.L (A1)+,(A0)+ ; copy red, green
MOVE (A1),(A0) ; copy blue
MOVEM.L (SP)+,A2-A3 ; restore work register
UNLINK PARAMSIZE,'GETRGBPA' ; unlink and return
SETFILLPAT PROC EXPORT
IMPORT OLDPATTONEW,PatConvert
;---------------------------------------------------------------
;
; PROCEDURE SETFILLPAT (PAT:PATTERN);
;
; Called by: FillRect, FillCRect, FillOval, FillCOval, FillRoundRect, FillCRoundRect
; FillArc, FillCArc, FillRgn, FillCRgn, FillPoly, FillCPoly
;
; On Entry: D0 = 0 Called by old fill routine
; D0 = 1 Called by color fill routine
;
; If called by old routine, install old-style pattern into FillPat (if old port)
; or FillPixPat (if new port). If called by new routine, install new-style pattern
; into FillPixPat (if new port) or just return (if old port).
MOVE.L 4(SP),A1 ;GET PATTERN POINTER
MOVE.L GRAFGLOBALS(A5),A0 ;GET GRAFGLOBALS
MOVE.L THEPORT(A0),A0 ;GET THE PORT
TST PORTBITS+ROWBYTES(A0) ;IS IT A COLOR GRAFPORT?
BPL.S SETOLD ;=>NO, SET OLD PATTERN
TST D0 ;OLD PATTERN OR NEW
BNE.S NEWFILLPAT ;=>NEW, SET NEW PATTERN
MOVE.L A1,-(SP) ;ELSE PUSH PATTERN
PEA FILLPIXPAT(A0) ;AND PIXPAT HANDLE
JSR OLDPATTONEW ;AND CONVERT TO COLOR PATTERN
BRA.S DONE
SETOLD TST D0 ;OLD PATTERN OR NEW?
BNE.S DONE ;=>NEW, JUST EXIT
LEA FILLPAT(A0),A0 ;POINT TO DST
MOVE.L (A1)+,(A0)+ ;COPY PAT INTO FILLPAT
MOVE.L (A1)+,(A0)+ ;ALL EIGHT BYTES
DONE MOVE.L (SP)+,(SP) ;STRIP PARAMETER
RTS ;AND RETURN
NEWFILLPAT
; Install the specified pixPatHandle at the specified position.
; We know the specified place is either NIL or contains a pixPatHandle.
; If it contains an old-style pixPatHandle, then dispose it before replacing.
MOVE.L 4(SP),-(SP) ; push the pixPatHandle
JSR PatConvert ; expand to current depth
MOVE.L (SP)+,A1 ; get the return address
LEA FILLPIXPAT(A0),A0 ; get handle pointer
MOVE.L A0,D2 ; save in D2
MOVE.L (A0),D0 ; is there a handle?
BEQ.S InstallNew ; => no, just install
MOVE.L D0,A0 ; get the pixpat handle
TST ([A0],PatType) ; is it an old one?
BNE.S InstallNew ; =>no, install pattern
_DisposHandle ; and dispose it
InstallNew MOVE.L D2,A0 ; get address of pnFillPat
MOVE.L (SP)+,(A0) ; install the handle
JMP (A1) ; and return
END
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