mirror of
https://github.com/A2osX/A2osX.git
synced 2024-08-14 13:29:02 +00:00
266 lines
5.2 KiB
Plaintext
266 lines
5.2 KiB
Plaintext
PR#3
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PREFIX /A2OSX.BUILD
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NEW
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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* CLIPPING Functions:
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* In:
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* Graphic Context in GC.Cache
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* YA = Control Block
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* Out:
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* CC : CB.Cache clipped & visible
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* CS : CB.Cache invisible
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*--------------------------------------
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CLIP.YA jsr CB.Get
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ldx CB.Cache+S.CB.CMD
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jmp (J.CLIP,x)
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*--------------------------------------
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CLIP.Point
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CLIP.HLine
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CLIP.VLine
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CLIP.Rect
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clc
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rts
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*--------------------------------------
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CLIP.BitBlt.9 pla
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CLIP.BitBlt.99 sec
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rts
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CLIP.BitBlt clc
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rts
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lda CB.Cache+S.CB.DestX
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ldx CB.Cache+S.CB.DestX+1
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pha
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>SCMPAX GC.Cache+S.GC.X2
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bpl CLIP.BitBlt.9 DestX after X2....exit
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pla
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>SCMPAX GC.Cache+S.GC.X1
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bpl .1 DestX Inside X1-X2, go check if X1+W fit in
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* S.CB.DestX before S.GC.X1: D=S.GC.X1-S.CB.DestX, S.CB.SrcW-=D, S.CB.DestX=0, S.CB.X1+=D
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lda GC.Cache+S.GC.X1 Compute D....
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sec
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sbc CB.Cache+S.CB.DestX
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sta D
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lda GC.Cache+S.GC.X1+1
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sbc CB.Cache+S.CB.DestX+1
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sta D+1 ....always positive
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lda CB.Cache+S.CB.SrcW S.CB.SrcW-=D
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sec
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sbc D
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sta CB.Cache+S.CB.SrcW
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iny
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lda CB.Cache+S.CB.SrcW+1
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sbc D
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sta CB.Cache+S.CB.SrcW+1
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bcc CLIP.BitBlt.99 Negative!!!! nothing to do,exit...
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stz CB.Cache+S.CB.DestX Dext.X=0
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stz CB.Cache+S.CB.DestX+1
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lda CB.Cache+S.CB.X1 S.CB.X1+=D
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clc
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adc D
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sta CB.Cache+S.CB.X1
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lda CB.Cache+S.CB.X1+1
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adc D+1
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sta CB.Cache+S.CB.X1+1 S.CB.DestX=0, new between S.GC.X1 & S.GC.X2....
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* S.CB.DestX between S.GC.X1 & S.GC.X2: D=S.GC.X2-S.CB.DestX
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.1 lda GC.Cache+S.GC.X2
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sec
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sbc CB.Cache+S.CB.DestX
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sta D
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lda GC.Cache+S.GC.X2+1
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sbc CB.Cache+S.CB.DestX+1
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sta D+1 Always positive...
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lda D
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cmp CB.Cache+S.CB.SrcW
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lda D+1
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sbc CB.Cache+S.CB.SrcW+1
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bcs CLIP.BitBlt.Y D >= SrcW....nothing to clip
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lda D SrcW < D, make SrcW=D
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sta CB.Cache+S.CB.SrcW
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lda D+1
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sta CB.Cache+S.CB.SrcW+1
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CLIP.BitBlt.Y lda CB.Cache+S.CB.DestY
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ldx CB.Cache+S.CB.DestY+1
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pha
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>SCMPAX GC.Cache+S.GC.Y2 DestY after Y2....exit
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bpl .9
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pla
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>SCMPAX GC.Cache+S.GC.Y1
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bpl .1 DestY Inside Y1-Y2, go check if Y1+H fit in
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* S.CB.DestY above S.GC.Y1: D=S.GC.Y1-S.CB.DestY, S.CB.SrcH-=D, S.CB.DestY=0, S.CB.Y1+=D
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* S.CB.DestY between S.GC.Y1 & S.GC.Y2: D=S.GC.Y2-S.CB.DestY
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.1
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clc
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rts
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.9 pla
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.99 sec
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rts
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*--------------------------------------
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CLIP.Line.LEFT .EQ 1
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CLIP.Line.RIGHT .EQ 2
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CLIP.Line.BOTTOM .EQ 4
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CLIP.Line.TOP .EQ 8
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*--------------------------------------
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CLIP.Line jsr CLIP.Line.EncodeP1
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jsr CLIP.Line.EncodeP2
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.1 lda CLIP.Line.P1
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ora CLIP.Line.P2
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beq .88
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lda CLIP.Line.P1
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and CLIP.Line.P2
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bne .99
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lda CLIP.Line.P1
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beq .5
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bit #CLIP.Line.TOP
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beq .2
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* Y1 is above S.CB.Y1....
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* DY=Y2-Y1;
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jsr CLIP.Line.EncodeP1
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bra .1
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.2 bit #CLIP.Line.BOTTOM
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beq .3
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* Y1 is below S.CB.Y2....
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jsr CLIP.Line.EncodeP1
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bra .1
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.3 bit #CLIP.Line.RIGHT
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beq .4
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* X1 is after S.CB.X2....
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jsr CLIP.Line.EncodeP1
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bra .1
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* X1 is before S.CB.X1....
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.4
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jsr CLIP.Line.EncodeP1
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bra .1
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* P2
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.5 lda CLIP.Line.P2
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bit #CLIP.Line.TOP
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beq .6
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* Y2 is above S.CB.Y1....
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jsr CLIP.Line.EncodeP2
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bra .1
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.6 bit #CLIP.Line.BOTTOM
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beq .7
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* Y2 is below S.CB.Y2....
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jsr CLIP.Line.EncodeP2
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bra .1
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.7 bit #CLIP.Line.RIGHT
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beq .8
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* X2 is after S.CB.X2....
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jsr CLIP.Line.EncodeP2
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bra .1
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* X2 is before S.CB.X1....
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.8
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jsr CLIP.Line.EncodeP2
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bra .1
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.88 clc
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rts
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.99 sec
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rts
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*--------------------------------------
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CLIP.Line.EncodeP1
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ldy #0
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lda CB.Cache+S.CB.X1
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ldx CB.Cache+S.CB.X1+1
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jsr CLIP.Line.EncodeX.AX
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tay
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lda CB.Cache+S.CB.Y1
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ldx CB.Cache+S.CB.Y1+1
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jsr CLIP.Line.EncodeY.AX
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sta CLIP.Line.P1
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rts
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*--------------------------------------
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CLIP.Line.EncodeP2
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ldy #0
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lda CB.Cache+S.CB.X2
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ldx CB.Cache+S.CB.X2+1
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jsr CLIP.Line.EncodeX.AX
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tay
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lda CB.Cache+S.CB.Y2
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ldx CB.Cache+S.CB.Y2+1
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jsr CLIP.Line.EncodeY.AX
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sta CLIP.Line.P2
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rts
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*--------------------------------------
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CLIP.Line.EncodeX.AX
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pha
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>SCMPAX GC.Cache+S.GC.X1
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bmi .1
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tya
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ora #CLIP.Line.LEFT
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plx
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rts
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.1 pla
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>SCMPAX GC.Cache+S.GC.X1
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bpl .8
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tya
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ora #CLIP.Line.RIGHT
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.8 rts
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*--------------------------------------
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CLIP.Line.EncodeY.AX
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pha
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>SCMPAX GC.Cache+S.GC.Y1
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bmi .1
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tya
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ora #CLIP.Line.TOP
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plx
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rts
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.1 pla
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>SCMPAX GC.Cache+S.GC.Y1
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bpl .8
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tya
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ora #CLIP.Line.BOTTOM
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.8 rts
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/LIB/LIBGUI.S.CLIP
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LOAD /A2OSX.SRC/LIB/LIBGUI.S
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ASM
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