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42 lines
1.0 KiB
ArmAsm
42 lines
1.0 KiB
ArmAsm
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; Ullrich von Bassewitz, 22.06.2002
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;
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; void __fastcall__ tgi_textstyle (unsigned char magx, unsigned char magy,
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; unsigned char dir);
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; /* Set the style for text output. */
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.include "tgi-kernel.inc"
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.import popax, incsp2
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.export _tgi_textstyle
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_tgi_textstyle:
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pha
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jsr popax ; Get magx/magy in one call
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tay
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pla
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; A = textdir, X = textmagx, Y = textmagy
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cmp #TGI_TEXT_HORIZONTAL
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beq DirOk
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cmp #TGI_TEXT_VERTICAL
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beq DirOk
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Fail: jmp tgi_inv_arg ; Invalid argument
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DirOk: cpy #$00
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beq Fail ; Cannot have magnification of zero
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cpx #$00
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beq Fail ; Cannot have magnification of zero
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; Parameter check ok, store them
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stx _tgi_textmagx
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sty _tgi_textmagy
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sta _tgi_textdir
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; Call the driver, parameters are passed in registers
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jmp tgi_textstyle
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