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74 lines
1.7 KiB
ArmAsm
74 lines
1.7 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 22.06.2002
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;
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.include "tgi-kernel.inc"
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.import _strlen, pushax, tosumulax
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.export _tgi_textwidth
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.export _tgi_textheight
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;-----------------------------------------------------------------------------
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; unsigned __fastcall__ tgi_textwidth (const char* s);
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; /* Calculate the width of the text in pixels according to the current text
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; * style.
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; */
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_tgi_textwidth:
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ldy _tgi_textdir ; Get text direction
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bne height
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; Result is
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;
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; strlen (s) * tgi_textmagx * tgi_fontsizex
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;
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; Since we don't expect textmagx to have large values, we do the multiplication
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; by looping.
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width: jsr _strlen
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jsr pushax
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lda #0
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tax
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ldy _tgi_textmagx
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@L1: clc
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adc _tgi_fontsizex
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bcc @L2
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inx
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@L2: dey
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bne @L1
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jmp tosumulax ; Result * strlen (s)
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;-----------------------------------------------------------------------------
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; unsigned __fastcall__ tgi_textheight (const char* s);
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; /* Calculate the height of the text in pixels according to the current text
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; * style.
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; */
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_tgi_textheight:
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ldy _tgi_textdir ; Get text direction
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bne width ; Jump if vertical
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; Result is
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;
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; tgi_textmagy * tgi_fontsizey
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;
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; Since we don't expect textmagx to have large values, we do the multiplication
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; by looping.
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height: lda #0
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tax
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ldy _tgi_textmagy
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@L1: clc
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adc _tgi_fontsizey
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bcc @L2
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inx
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@L2: dey
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bne @L1
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rts
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