/
UIFFFormat.a
executable file
·156 lines (101 loc) · 2.51 KB
/
UIFFFormat.a
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;Photoshop version 1.0.1, file: UIFFFormat.a
; Computer History Museum, www.computerhistory.org
; This material is (C)Copyright 1990 Adobe Systems Inc.
; It may not be distributed to third parties.
; It is licensed for non-commercial use according to
; www.computerhistory.org/softwarelicense/photoshop/
INCLUDE 'Traps.a'
; **********************************************************************
SEG 'AIFFFormat'
ExtractPlane PROC EXPORT
; Calling sequence (Pascal conventions):
;
; PROCEDURE ExtractPlane (iData: Ptr;
; pData: Ptr;
; cols: INTEGER;
; plane: INTEGER);
;
; Parameter Offsets
@iData EQU 16
@pData EQU 12
@cols EQU 10
@plane EQU 8
; Size of parameters
@params EQU 12
; Save registers
LINK A6,#0
; Extract the plane
MOVE.L @iData(A6),A0
MOVE.L @pData(A6),A1
; D0 is input bit number
MOVE.W @plane(A6),D0
; D1 is output bit number
MOVE.W #7,D1
; D2 is column counter
MOVE.W @cols(A6),D2
SUB.W #1,D2
; Get the bits
@1 BTST D0,(A0)+
BEQ.S @2
BSET D1,(A1)
; Update output pointer
@2 SUB.W #1,D1
BGE.S @3
ADD.W #8,D1
ADD.W #1,A1
; Close loop
@3 DBF D2,@1
; Clean up and exit
UNLK A6
MOVE.L (SP)+,A0
ADD.W #@params,SP
JMP (A0)
; **********************************************************************
SEG 'AIFFFormat'
StuffPlane PROC EXPORT
; Calling sequence (Pascal conventions):
;
; PROCEDURE StuffPlane (pData: Ptr;
; iData: Ptr;
; cols: INTEGER;
; plane: INTEGER);
;
; Parameter Offsets
@pData EQU 16
@iData EQU 12
@cols EQU 10
@plane EQU 8
; Size of parameters
@params EQU 12
; Save registers
LINK A6,#0
; Extract the plane
MOVE.L @pData(A6),A0
MOVE.L @iData(A6),A1
; D0 is input bit number
MOVE.W #7,D0
; D1 is output bit number
MOVE.W @plane(A6),D1
; D2 is column counter
MOVE.W @cols(A6),D2
SUB.W #1,D2
; Get the bits
@1 BTST D0,(A0)
BEQ.S @2
BSET D1,(A1)
; Update input pointer
@2 SUB.W #1,D0
BGE.S @3
ADD.W #8,D0
ADD.W #1,A0
; Update output pointer
@3 ADD.W #1,A1
; Close loop
DBF D2,@1
; Clean up and exit
UNLK A6
MOVE.L (SP)+,A0
ADD.W #@params,SP
JMP (A0)
; **********************************************************************
END