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57 lines
841 B
ArmAsm
57 lines
841 B
ArmAsm
;=============================================================
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; hgr copy from page in A to current DRAW_PAGE but magnify 2x
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;=========================================================
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; would be faster if we unroll it, but much bigger
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; At first from left side of image, eventually arbitrary?
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; destination in A?
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hgr_copy_magnify:
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; for (y=0;y<192;y++) {
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; for(x=0;x<40;x+=2) {
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; A=src[x];
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; dest[x]=lookup1[A];
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; dest[x+1]=lookup2[A];
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; y++;
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; dest[x]=lookup1[A];
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; dest[x+1]=lookup2[A];
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; }
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; }
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ldx #0
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magnify_outer_loop:
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lda hposn_low,X
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sta OUTL
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lda hposn_high,X
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clc
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adc DRAW_PAGE
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sta OUTH
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lda hposn_low,X
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sta INL
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lda hposn_high,X
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clc
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adc #$40
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sta INH
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ldy #0
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magnify_inner_loop:
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lda (INL),Y
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sta (OUTL),Y
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iny
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cpy #40
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bne magnify_inner_loop
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inx
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cpx #192
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bne magnify_outer_loop
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rts
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