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116 lines
3.3 KiB
Plaintext
116 lines
3.3 KiB
Plaintext
;
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; File: puDispatch.a
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;
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; Contains: Dispatch code for the picture utilities package.
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;
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; Written by: Dave Good. Some ideas stolen from Konstantin Othmer and Bruce Leak. Prototyped by Cris Rys.
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;
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; Copyright: © 1990, 1992 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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; <SM2> 11/5/92 SWC Changed INCLUDEs to a LOAD of StandardEqu.d.
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; <6> 9/21/90 gbm (Actually DDG) Fixed string problem. Also added code for the Non
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; ProcHelper version to clear out the high byte of the selector
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; (the number of parameters).
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; <5> 9/21/90 DDG Made changes from code review. Changed the dispatch to use proc
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; helper. I also left the old code conditionaled out, so that we
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; can always do test builds if we need to.
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; <4> 8/3/90 DDG Changed the selectors back to the by one scheme.
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; <3> 7/31/90 DDG Fixed the check for the maximum selector to reflect the by-two
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; scheme.
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; <2> 7/29/90 DDG Fixed header.
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; <1> 7/29/90 DDG First checked in using new structure.
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;
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MACHINE MC68000
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CASE OBJ
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LOAD 'StandardEqu.d'
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STRING ASIS
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;----------------------------------------------------------------------------------------------------
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PictUtilEntry MAIN EXPORT
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IMPORT __GETPICTINFO
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IMPORT __GETPIXMAPINFO
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IMPORT __NEWPICTINFO
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IMPORT __RECORDPIXMAPINFO
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IMPORT __RECORDPICTINFO
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IMPORT __RETRIEVEPICTINFO
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IMPORT __DISPOSPICTINFO
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IF 0 THEN
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and.w #$00FF,d0 ; clear the upper byte (number of parameters)
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cmp.w #6,d0 ; if unsigned d0 > max selector,
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bhi.s exit ; don't do anything
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lsl.w #2,d0 ; multiply our selector by four to get the true jump table offset
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jmp dispatchTable(d0.w) ; jump in jump table
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dispatchTable
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jmp __GETPICTINFO ; selector 0
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jmp __GETPIXMAPINFO ; selector 1
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jmp __NEWPICTINFO ; selector 2
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jmp __RECORDPICTINFO ; selector 3
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jmp __RECORDPIXMAPINFO ; selector 4
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jmp __RETRIEVEPICTINFO ; selector 5
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jmp __DISPOSPICTINFO ; selector 6
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exit move.l (sp)+,a0 ; get return address
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swap d0 ; get size of parameters in low word
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add.w d0,sp ; get rid of parameters
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moveq #paramErr,d0 ; return parameter error in D0
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move.w d0,(sp) ; return parameter error in function result
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jmp (a0) ; and return to caller
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ELSE
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;
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; Macro to build jump table
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;
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MACRO
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JT &entry
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IMPORT &entry
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dc.w &entry - MyDispatchTable
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ENDM
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;
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; Header for ProcHelper
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;
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dc.w $A9FF ; package entry point (unused now)
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dc.b 'PACK'
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dc.w 15 ; package number
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dc.w 1 ; version
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;
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; DispatchTable for DispatchHelper
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;
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MyDispatchTable
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dc.w 0 ; dispatchFlags (always 0)
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dc.b $00 ; first selector (0 for GetPictInfo)
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dc.b $06 ; last selector (6 for DisposPictInfo)
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JT __GETPICTINFO ; selector 0
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JT __GETPIXMAPINFO ; selector 1
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JT __NEWPICTINFO ; selector 2
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JT __RECORDPICTINFO ; selector 3
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JT __RECORDPIXMAPINFO ; selector 4
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JT __RETRIEVEPICTINFO ; selector 5
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JT __DISPOSPICTINFO ; selector 6
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ENDIF
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ENDPROC
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;----------------------------------------------------------------------------------------------------
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END
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