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296 lines
5.9 KiB
ArmAsm
296 lines
5.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2009-11-02
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;
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; void __fastcall__ tgi_vectorchar (const unsigned char* Ops);
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; /* Draw one character of the vector font at the current graphics cursor
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; * position using the current font magnification.
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; */
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;
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.import imul16x16r32, umul16x16r32, negax, negeax
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.include "tgi-kernel.inc"
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.include "tgi-vectorfont.inc"
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.include "zeropage.inc"
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.macpack longbranch
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;----------------------------------------------------------------------------
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; Data
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Ops = regbank
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Flag = regbank+2
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.bss
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X1: .res 2
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Y1: .res 2
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X2: .res 2
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Y2: .res 2
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;----------------------------------------------------------------------------
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; Get the next operation from the Ops pointer, remove the flag bit and sign
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; extend the 8 bit value to 16 bits.
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.code
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.proc GetOp
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; Load delta value
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ldy #0
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lda (Ops),y
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inc Ops
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bne :+
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inc Ops+1
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; Move bit 7 into Flag, then sign extend the value in A and extend the sign
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; into X.
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: asl a ; Flag into carry
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ror Flag
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ldx #0
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cmp #$80 ; Sign bit into carry
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ror a ; Sign extend the value
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bpl :+
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dex ; Value is negative
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; Done
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: rts
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.endproc
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;----------------------------------------------------------------------------
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; Get and process one coordinate value. The scale factor is passed in a/x
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.code
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GetProcessedYCoord:
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lda _tgi_textscaleh+0
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ldx _tgi_textscaleh+1
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GetProcessedCoord:
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; Save scale factor as left operand for multiplication
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sta ptr1
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stx ptr1+1
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; Load next operation value.
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jsr GetOp
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; Multiplicate with the scale factor.
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jmp tgi_imulround ; Multiplicate, round and scale
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;----------------------------------------------------------------------------
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; Add the base coordinate with offset in Y to the value in A/X
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.code
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.proc AddBaseCoord
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clc
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adc _tgi_curx+0,y
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pha
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txa
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adc _tgi_curx+1,y
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tax
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pla
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rts
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.endproc
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;----------------------------------------------------------------------------
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; Subtract the value in a/x from the base coordinate with offset in Y
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; This is
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;
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; ax = _tgi_cur[xy] - ax
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;
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; which can be transformed to
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;
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; ax = _tgi_cur[xy] + (~ax + 1);
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.code
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.proc SubBaseCoord
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eor #$FF
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sec ; + 1
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adc _tgi_curx+0,y
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pha
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txa
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eor #$FF
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adc _tgi_curx+1,y
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tax
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pla
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rts
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.endproc
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;----------------------------------------------------------------------------
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;
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.code
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.proc _tgi_vectorchar
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; Multiplicate the char value by two and save into Y
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asl a
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tay
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; Since we will call tgi_lineto, which uses the zero page, and we do also
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; need the zero page, make room in the register bank.
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lda Ops
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pha
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lda Ops+1
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pha
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lda Flag
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pha
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; Calculate a pointer to the vector ops for the given char (now in Y). We
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; definitely expect a font here, that has to be checked by the caller.
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lda _tgi_vectorfont
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clc
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adc #<(TGI_VECTORFONT::CHARS - 2*TGI_VF_FIRSTCHAR)
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sta Ops
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lda _tgi_vectorfont+1
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adc #>(TGI_VECTORFONT::CHARS - 2*TGI_VF_FIRSTCHAR)
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sta Ops+1
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iny
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lda (Ops),y
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tax
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dey
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lda (Ops),y
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sta Ops
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stx Ops+1
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; Main loop executing vector operations
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Loop: lda _tgi_textscalew+0
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ldx _tgi_textscalew+1
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jsr GetProcessedCoord ; Get X vector
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; Depending on the text direction, the X vector is either applied to X as
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;
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; X2 = _tgi_curx + XMag * XDelta
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;
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; or applied to Y as
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;
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; Y2 = _tgi_cury - XMag * XDelta
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;
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; which can be transformed to
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;
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; Y2 = _tgi_cury + (~(XMag * XDelta) + 1);
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;
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;
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; For the Y component we have
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;
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; Y2 = _tgi_cury - YMag * YDelta
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;
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; which can be transformed to
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;
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; Y2 = _tgi_cury + (~(YMag * YDelta) + 1);
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;
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; or applied to X as
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;
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; X2 = _tgi_curx - YMag * YDelta
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;
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; which can be transformed to
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;
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; X2 = _tgi_curx + (~(YMag * YDelta) + 1);
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;
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ldy _tgi_textdir ; Horizontal or vertical text?
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bne @Vertical ; Jump if vertical
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; Process horizontal text
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ldy #0
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jsr AddBaseCoord
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sta X2
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stx X2+1
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; Get Y vector
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jsr GetProcessedYCoord
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; Apply to Y
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ldy #2
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jsr SubBaseCoord
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sta Y2
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stx Y2+1
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jmp @DrawMove
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; Process vertical text
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@Vertical:
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ldy #2
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jsr SubBaseCoord
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sta Y2
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stx Y2+1
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; Get Y vector
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jsr GetProcessedYCoord
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; Apply to X
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ldy #0
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jsr SubBaseCoord
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sta X2
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stx X2+1
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; Draw, then move - or just move
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@DrawMove:
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bit Flag
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bpl @Move ; Jump if move only
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.if 0
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ldy #7 ; Copy start coords into zp
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: lda X1,y
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sta ptr1,y
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dey
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bpl :-
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jsr tgi_line ; Call the driver
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.else
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ldy #7 ; Copy start coords
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: lda X1,y
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sta tgi_clip_x1,y
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dey
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bpl :-
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jsr tgi_clippedline ; Call line clipper
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.endif
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; Move the start position
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@Move: ldy #3
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: lda X2,y
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sta X1,y
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dey
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bpl :-
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; Loop if not done
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bit Flag
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bvc Loop
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; Done. Restore zp and return.
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pla
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sta Flag
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pla
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sta Ops+1
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pla
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sta Ops
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rts
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.endproc
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