176 lines
4.1 KiB
Plaintext
176 lines
4.1 KiB
Plaintext
;
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; File: ZoomRect.a
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;
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; Contains: A convenient window-zooming routine
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;
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; Written by: Phil Goldman
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;
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; Copyright: © 1986-1991 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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; <0> x/xx/87 PYG New Today.
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;
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;--------------------------------------------------------------------
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;=====================================FUtil68K=====================================
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;
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; PROCEDURE ZoomRect(VAR smallRect,bigRect: Rect; zoomUp: BOOLEAN);
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;
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; Frees the passed dialog record (or 0 if none).
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;
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;=====================================FUtil68K=====================================
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LOAD 'ProcessMgrIncludes.D'
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zoomSteps EQU 12
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tickDelay EQU 1 ; 1*1/60 sec between rects
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; takes two rects in a2/a3 and blends into rect in a4
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; fract in d7, factor in d5.
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ZoomRect PROC EXPORT
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ZoomRectRegs REG d2-d7/a2-a4
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link a6,#-32 ; 4 rectangles
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movem.l ZoomRectRegs,-(sp) ; save registers
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lea -32(a6),a0
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moveq #7,d0
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nilRects
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clr.l (a0)+ ; zero out all the rects
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dbra d0,nilRects
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subq.l #4,sp
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move.l sp,-(sp)
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_GetPort
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move.l wmgrPort,-(sp)
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_SetPort
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move.l GrayRgn,a0 ; get rgn hdl of gray rgn
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move.l (a0),a0 ; hdl -> ptr
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pea rgnBBox(a0) ; push the rect
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_ClipRect
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move.l (a5),a0
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pea gray(a0)
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_PenPat
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move.w #notpatXor,-(sp)
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_PenMode
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; see if going up or down (point a0 to starting rect)
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tst.b 8(a6) ; up or down
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beq.s zoomDown
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zoomUp
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subq.l #4,sp
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move.l #$00050007,-(sp) ; 7/5
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_FixRatio
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move.l (sp),d5 ; factor in d5 (leave on stack)
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move.l #$271000B0,-(sp) ; 5/7 ^zoomSteps = 0.017638
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_FixRatio
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move.l (sp)+,d7 ; fract in d7
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BRA.S zoomStart
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zoomDown
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subq.l #4,sp
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move.l #$00070005,-(sp) ; 5/7
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_FixRatio
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move.l (sp)+,d5 ; factor in d5
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moveq #1,d7 ; fract is 1
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swap d7 ; fract in d7
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zoomStart
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moveq #zoomSteps,d4 ; counter
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subq.l #4,sp ; make room for result
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_TickCount
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move.l (sp)+,d6 ; sync with ticks
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zoomloop
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lea -8(a6),a4 ; start w/rect 4
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move.l 10(a6),a3 ; point to big rect
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move.l 14(a6),a2 ; point to small rect
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bsr.s Blender ; 4 halves of the rect
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bsr.s Blender
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bsr.s Blender
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bsr.s Blender
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pea -8(a6) ; frame newest
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_FrameRect
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ticksSync
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cmp.l Ticks,d6 ; less than time we want?
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bhs.s ticksSync ; unsigned! wait
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; move.l d0,d6 ; save current time
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addq.l #tickDelay,d6 ; wait until this time is by
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tst.l -32(a6) ; oldest topLeft nil?
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bne.s @frameIt ; br if not
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tst.l -28(a6) ; botRight nil?
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beq.s @skipFrame ; br if so, skip empty rect
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@frameIt
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pea -32(a6) ; remove oldest
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_FrameRect
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@skipFrame
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lea -24(a6),a0 ; rect1=rect2, etc.
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lea -32(a6),a1
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moveq #24,d0
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_BlockMove
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subq.l #4,sp
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move.l d7,-(sp) ; bump interp.
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move.l d5,-(sp)
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_FixMul
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move.l (sp)+,d7
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subq.w #1,d4 ; more to do?
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bne.s zoomLoop
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pea -32(a6) ; remove oldest
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_FrameRect
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pea -24(a6) ; remove oldest
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_FrameRect
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pea -16(a6) ; remove oldest
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_FrameRect
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_PenNormal
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_SetPort
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noZoom
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movem.l (sp)+,ZoomRectRegs ; and restore regs
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unlk a6 ; get rid of frame ptr
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move.l (sp)+,a0 ; get ret addr
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add.l #10,sp ; strip params
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jmp (a0) ; and return
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Blender
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subq.l #6,sp ; room for temp
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move.l d7,-(sp)
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clr.w -(sp) ; zero fractional part
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move.w (a3)+,-(sp) ; get big rect part
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_FixMul
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subq.l #4,sp ; room for temp
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clr.l -(sp) ; make a $00010000 on the stack
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addq.w #1,(sp)
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sub.l d7,(sp) ; subtract fract
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clr.w -(sp) ; zero fractional part
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move.w (a2)+,-(sp) ; get small rect part
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_FixMul
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move.l (sp)+,d0
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add.l d0,(sp) ; add the two
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_FixRound
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move.w (sp)+,(a4)+ ; stuff rect
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rts
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ENDPROC ; ZoomRect
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END
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