380 lines
10 KiB
Plaintext
380 lines
10 KiB
Plaintext
;
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; File: Mouse.a
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;
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; Contains: routines related to the mouse
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;
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; Written by: Steve Horowitz & Francis Stanbach
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;
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; Copyright: © 1990 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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; <7> 1/13/91 dba (KIP) add fix for old key repeat bugs in the Macintosh Plus ROM;
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; specifically, be sure that KeyThresh and KeyRepThresh do not
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; have 0s in them
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; <6> 7/10/90 dba Oops! Frank forgot to export MTable and he didn’t test it (my
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; fault, I was with him at the time).
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; <5> 7/10/90 fjs more cleanup related to Darin
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; <4> 5/19/90 fjs more cleanup related to Darin
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; <3> 5/16/90 dba work on it more (tag-team programming)
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; <2> 5/16/90 fjs add more comments for Captain Van Eye Patch
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; <1> 5/16/90 fjs Annette sure was cute
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; 5/15/90 fjs That's right I'm writing this code
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;
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; To Do:
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;
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load 'StandardEqu.d'
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include 'LinkedPatchMacros.a'
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MGlobals record 0 ; mouse mapping globals data structure
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Count ds.w 1 ; word: number of valid error deltas
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MaxCnt ds.w 1 ; word: limit on number of error deltas
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Err7 ds.w 1 ; word: time-7 error magnitude
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Err6 ds.w 1 ; word: time-6 error magnitude
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Err5 ds.w 1 ; word: time-5 error magnitude
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Err4 ds.w 1 ; word: time-4 error magnitude
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Err3 ds.w 1 ; word: time-3 error magnitude
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Err2 ds.w 1 ; word: time-2 error magnitude
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Err1 ds.w 1 ; word: time-1 error magnitude
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Error ds.w 1 ; word: accumulated error
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GSize equ * ; size of regular globals
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Table ds.b 8 ; mickey bytes table
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TotalSize equ * ; size
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endr
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;————————————————————————————————————————————————————————————————————————————————————————————————————
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; initialize the mouse mapping table
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PlusMouseInit InstallProc (Plus)
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import MickeyBytesHelper
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import MTable
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; since the Plus boot code sometimes leaves KeyThresh and KeyRepThresh 0, check for that case.
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tst.w KeyRepThresh
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bne.s KeyRepThreshOK
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move.w #$48*2,KeyRepThresh ; stuff same value used by modern boot code
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KeyRepThreshOK
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tst.w KeyThresh
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bne.s KeyThreshOK
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move.w #$1FFF<<2,KeyThresh ; stuff same value used by modern boot code
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KeyThreshOK
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lea MTable,a2 ; load pointer to table in a2
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jmp MickeyBytesHelper
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endproc
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ADBMouseInit InstallProc (SE,II,Portable,IIci)
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import MickeyBytesHelper
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move.l MickeyBytes,a2 ; get ptr to globals
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add #MGlobals.Table,a2 ; point past globals to table
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jmp MickeyBytesHelper
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endproc
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MickeyBytesHelper proc
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; get the value in PRAM
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moveq #$78,d0 ; mask off the appropriate bits
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and.b SPVolCtl,d0 ; of value from PRAM
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lsr.b #3,d0 ; gets resource # to load
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; attempt to get the resource from system file
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subq #4,sp ; room for ResHandle
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move.l #'mcky',-(sp) ; Mickey Mouse Tracking bytes
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move.w d0,-(sp) ; gives us our ID
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_GetResource
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move.l (sp)+,d0 ; get handle into d0
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beq.s noBytes ; we didn't get one, use default
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move.l d0,a0 ; get handle in a0
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move.l (a0),a0 ; source = mickey bytes
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bra.s gotMickey ; install the bytes (should this be 'rts' ?)
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noBytes
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lea default, a0 ; use the default bytes
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; make it default to 2 if there is no resource
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and.b #87,SPVolCtl ; mask off old setting
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ori.b #(2<<3),SPVolCtl ; and OR it in PRAM
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gotMickey
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move.l (a0)+,(a2)+ ; move the bytes in
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move.l (a0),(a2)
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rts
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default dc.b 4, 10, 15, 255, 255, 255, 255, 255
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ENDPROC
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;————————————————————————————————————————————————————————————————————————————————————————————————————
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; Mouse Mapping code for Mac Plus
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ROMs Plus
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MakePatch MapCode,jCrsrTask
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MouseMapping PROC
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EXPORT MapCode
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EXPORT MTable
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; This signature is so that the Mouse control panel can recognize this lovely CrsrTask.
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; It is probably completely unnecessary; at the very least we could do something shorter.
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STRING ASIS
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Signature dc.b 'Horowitz' ; isn’t that special
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Globals
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; define these as constants instead of storage so that you can give them
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; initial values without explicitly initializing them. Is this cheezy or
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; genius ? <15may90 fjs>
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mCount dc.w 1 ; word: number of valid error deltas
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mMaxCnt dc.w 1 ; word: limit on number of error deltas
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mErr7 dc.w 0 ; word: time-7 error magnitude
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mErr6 dc.w 0 ; word: time-6 error magnitude
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mErr5 dc.w 0 ; word: time-5 error magnitude
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mErr4 dc.w 0 ; word: time-4 error magnitude
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mErr3 dc.w 0 ; word: time-3 error magnitude
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mErr2 dc.w 0 ; word: time-2 error magnitude
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mErr1 dc.w 0 ; word: time-1 error magnitude
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mError dc.w 0 ; word: accumulated error
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mTable dc.b 0,0,0,0,0,0,0,0 ; mickey bytes table (some day put default values here?)
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with MGlobals
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MapCode
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tst.b CrsrNew ; Mouse changed?
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beq Done ; No … return
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tst.b CrsrBusy ; Cursor locked?
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bne Done ; Yes … return
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tst.b CrsrCouple ; Cursor coupled to mouse?
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beq NoComp ; No … skip computation <DSV>
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move.w MTemp+H,D0 ; Find ∆Mx
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sub.w RawMouse+H,D0
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move.w MTemp+V,d1 ; Find ∆My
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sub.w RawMouse+V,d1
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move.w d0,d2 ; x := |∆Mx|
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bge.s AbsX
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neg.w d2
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AbsX
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move.w d1,d3 ; y := |∆My|
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bge.s AbsY
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neg.w d3
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AbsY
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cmp.w d2,d3 ; d3 := magnitude(x,y)
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bls.s magdone
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exg d2,d3
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MagDone
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ASR.w #1,d3
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add.w d2,d3
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; *** BEGIN NEW ***
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lea Globals,a0 ; Get my globals
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bne.s DoComp ; <03/07/87 EMT>
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move.w #1,Count(a0) ; No hits <03/07/87 EMT>
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clr.w Error(a0) ; No errors <03/07/87 EMT>
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BRA DoPin ; Redraw the cursor <03/07/87 EMT>
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DoComp ; <03/07/87 EMT>
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moveM.l d4-d5,-(A7) ; Save off registers
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move.w Count(a0),d4 ; d4 is the number of samples
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cmp.w MaxCnt(a0),d4 ; Is Count less than MaxCnt
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bge.s CountOK
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add.w #1,Count(a0) ; Yes … we will have one more error
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CountOK
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move.w d3,d5 ; Magnitude at current time
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move.w d4,d2 ; Get Count
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sub.w #1,d2 ; Index into JTab
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ASL.w #1,d2 ; REQUIRES bra.s’s IN JUMP TAbleS
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JMP JTab(PC,d2.w) ; Jump to the right code per Count
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JTab bra.s E1 ; Count = 1
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bra.s E2 ; Count = 2
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bra.s E3 ; Count = 3
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bra.s E4 ; Count = 4
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bra.s E5 ; Count = 5
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bra.s E6 ; Count = 6
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bra.s E7 ; Count = 7
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; *** bra.s E8 ; Count = 8 ***
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E8 add.w Err7(a0),d5 ; Accumulate time-7 magnitude
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E7 add.w Err6(a0),d5 ; Accumulate time-6 magnitude
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move.w Err6(a0),Err7(a0) ; Shift out time-6 magnitude
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E6 add.w Err5(a0),d5 ; Accumulate time-5 magnitude
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move.w Err5(a0),Err6(a0) ; Shift out time-5 magnitude
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E5 add.w Err4(a0),d5 ; Accumulate time-4 magnitude
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move.w Err4(a0),Err5(a0) ; Shift out time-4 magnitude
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E4 add.w Err3(a0),d5 ; Accumulate time-3 magnitude
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move.w Err3(a0),Err4(a0) ; Shift out time-3 magnitude
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E3 add.w Err2(a0),d5 ; Accumulate time-2 magnitude
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move.w Err2(a0),Err3(a0) ; Shift out time-2 magnitude
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E2 add.w Err1(a0),d5 ; Accumulate time-1 magnitude
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move.w Err1(a0),Err2(a0) ; Shift out time-1 magnitude
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E1 move.w d3,Err1(a0) ; Shift out current magnitude
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move.w d4,d2 ; Round up the divide
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ASR.w #1,d2 ; by half the denominator
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add.w d2,d5
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EXT.l d5 ; Set up for the divide
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DIVU d4,d5 ; Find the average magnitude
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move.w d3,d4 ; Get the original magnitude
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sub.w d5,d3 ; Find distance to average magnitude
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add.w Error(a0),d3 ; add on the accumulated error
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cmp.w #-1,d3 ; Define -1 div 2 = 0
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bne.s DivOK
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clr.w d3
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DivOK ASR.w #1,d3 ; Get half of it
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move.w d3,Error(a0) ; Update it
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add.w d5,d3 ; Desired mag is average+Error
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cmp.w #255,d5 ; mag := MAX(mag,255)
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BLS.s MaxDone
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move.b #255,d5
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MaxDone
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lea MTable,a0 ; address Table
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clr.w d2 ; i := 0
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Search
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add.b #1,d2 ; repeat
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cmp.b (a0)+,d5 ; i := i+1
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BHI.s Search ; until mag ≤ Table[i]
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muls d2,d3 ; d4 := i*(Mag(∆M)+Error)
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muls d3,d0 ; ∆Cx := (∆Mx*i*(Mag(∆M)+Error))/Mag(∆M)
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divs d4,d0 ; <<<<<< d3 >>>>>>>
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muls d3,d1 ; ∆Cy := (∆My*i*(Mag(∆M)+Error))/Mag(∆M)
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divs d4,d1 ; <<<<<< d3 >>>>>>>
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moveM.l (A7)+,d4-d5 ; Restore registers
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; *** END NEW ***
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add.w d0,RawMouse+H ; Update raw mouse location
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add.w d1,RawMouse+V
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DoPin ; <03/07/87 EMT>
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lea CrsrPin,a0 ; Bounding rect for cursor
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move.l RawMouse,d0 ; Pin mouse inside rect
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BSR.s PinGuts
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move.l d0,RawMouse ; Update cursor locations
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move.l d0,MTemp
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AND.l MouseMask,d0 ; Do jerky masking to drop low bits
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move.l MouseOffset,d1 ; Get the offset
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beq.s SkipPin ; Skip 2nd pin if not
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add.l d1,d0 ; Do jerky offset
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BSR.s PinGuts ; Pin mouse inside rect again
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SkipPin
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move.l d0,Mouse ; Actual mouse location
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Repaint
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TST.b CrsrObscure ; Unpaint the cursor
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bne.s Unpainted
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_HideCursor ; Hide the cursor
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Unpainted
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clr.b CrsrNew ; Cursor is fresh
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clr.b CrsrObscure ; Cursor is not obscured
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_ShowCursor ; Repaint the cursor
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; *** BEGIN NEW ***
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rts ; Goodbye
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Done
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lea Globals,a0 ; Get my globals
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move.w #1,Count(a0) ; No hits
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clr.w Error(a0) ; No errors
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rts ; Goodbye
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NoComp
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lea Globals,a0 ; Get my globals
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move.w #1,Count(a0) ; No hits
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clr.w Error(a0) ; No errors
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bra.s Repaint ; Update the cursor
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; *** END NEW ***
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; PinGuts limits the point in d0 to the bounding rectangle pointed to by a0.
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; use the ROM instead, since it even works better, but only when you are really sure!
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; (Darin)
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PinGuts
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cmp.w Left(a0),d0 ; Check left side
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bge.s LeftOK
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move.w Left(a0),d0
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LeftOK
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cmp.w Right(a0),d0 ; Check right side
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ble.s RightOK
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move.w Right(a0),d0
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sub.w #1,d0
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RightOK
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swap d0 ; Deal with vertical coord
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cmp.w Top(a0),d0 ; Check top
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bge.s TopOK
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move.w Top(a0),d0
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TopOK
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cmp.w Bottom(a0),d0 ; Check bottom
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ble.s BotOK
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move.w Bottom(a0),d0
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sub.w #1,d0
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BotOK
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swap d0
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rts
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endwith
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endproc
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end
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