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ULine.a
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ULine.a
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;Photoshop version 1.0.1, file: ULine.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 'ALineTool'
DoMarkLine PROC EXPORT
; Calling sequence (Pascal conventions):
;
; PROCEDURE DoMarkLine (srcPtr: Ptr;
; dstPtr: Ptr;
; level: INTEGER;
; count: INTEGER);
;
; Parameter Offsets
@srcPtr EQU 16
@dstPtr EQU 12
@level EQU 10
@count EQU 8
; Size of parameters
@params EQU 12
; Save registers
LINK A6,#0
MOVEM.L D3-D5,-(SP)
; Unload addresses
MOVE.L @srcPtr(A6),A0
MOVE.L @dstPtr(A6),A1
; Initialize loop
MOVE.W @count(A6),D0
SUB.W #1,D0
MOVE.W @level(A6),D1
CLR.W D2
MOVE.W #255,D3
; Process next byte
@1 MOVE.B (A0)+,D2
BNE.S @2
ADDA.W #1,A1
DBF D0,@1
BRA.S @4
; Test for mask equal to 255
@2 CMP.W D3,D2
BNE.S @3
MOVE.B D1,(A1)+
DBF D0,@1
BRA.S @4
; Else blend the two values
@3 MOVE.W D1,D4
MULU.W D2,D4
CLR.W D5
MOVE.B (A1),D5
NOT.B D2
MULU.W D2,D5
ADD.W D4,D5
ADD.W #127,D5
MULU.W #257,D5
SWAP D5
MOVE.B D5,(A1)+
DBF D0,@1
; Clean up and exit
@4 MOVEM.L (SP)+,D3-D5
UNLK A6
MOVE.L (SP)+,A0
ADD.W #@params,SP
JMP (A0)
; **********************************************************************
SEG 'ALineTool'
DoMultiplyMasks PROC EXPORT
; Calling sequence (Pascal conventions):
;
; PROCEDURE DoMultiplyMasks (srcPtr: Ptr;
; dstPtr: Ptr;
; count: INTEGER);
;
; Parameter Offsets
@srcPtr EQU 14
@dstPtr EQU 10
@count EQU 8
; Size of parameters
@params EQU 10
; Save registers
LINK A6,#0
MOVEM.L D3-D4,-(SP)
; Unload addresses
MOVE.L @srcPtr(A6),A0
MOVE.L @dstPtr(A6),A1
; Initialize loop
MOVE.W @count(A6),D0
SUB.W #1,D0
CLR.W D1
CLR.W D2
MOVE.W #255,D3
; Case 1: source is zero
@1 MOVE.B (A0)+,D1
BNE.S @2
CLR.B (A1)+
DBF D0,@1
BRA.S @6
; Case 2: source is 255
@2 CMP.B D3,D1
BNE.S @3
ADDA.W #1,A1
DBF D0,@1
BRA.S @6
; Case 3: destination is zero
@3 MOVE.B (A1)+,D2
BNE.S @4
DBF D0,@1
BRA.S @6
; Case 4: destination is 255
@4 CMP.B D3,D2
BNE.S @5
MOVE.B D1,-1(A1)
DBF D0,@1
BRA.S @6
; Case 5: general case
@5 MOVE.W D1,D4
MULU.W D2,D4
ADD.W #127,D4
MULU.W #257,D4
SWAP D4
MOVE.B D4,-1(A1)
DBF D0,@1
; Clean up and exit
@6 MOVEM.L (SP)+,D3-D4
UNLK A6
MOVE.L (SP)+,A0
ADD.W #@params,SP
JMP (A0)
; **********************************************************************
END