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103 lines
2.5 KiB
ArmAsm
103 lines
2.5 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2009-10-30
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;
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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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.import _strlen, _toascii
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.import umul16x16r32
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;-----------------------------------------------------------------------------
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; Aliases for zero page locations
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Width := ptr1
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WTab := ptr2
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Text := ptr3
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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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;
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; Result is strlen (s) * tgi_textmagw * tgi_fontsizex
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;
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.code
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.proc _tgi_textwidth
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ldy _tgi_font
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bne @L1 ; Jump if vector font
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; Return the width of the string for the bitmap font
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jsr _strlen
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sta ptr1
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stx ptr1+1
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lda _tgi_charwidth
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ldx #0
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jmp umul16x16r32
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; Return the width of the string for the vector font. To save some code, we
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; will add up all the character widths and then multiply by the scale factor.
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; Since the output routine will scale each single character, the result may
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; be slightly different.
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@L1: sta Text
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stx Text+1 ; Save pointer to string
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lda _tgi_vectorfont+1
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tax
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ora _tgi_vectorfont
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beq @L9 ; Return zero if no font
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lda _tgi_vectorfont
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clc
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adc #<(TGI_VECTORFONT::WIDTHS - TGI_VF_FIRSTCHAR)
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sta WTab
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txa
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adc #>(TGI_VECTORFONT::WIDTHS - TGI_VF_FIRSTCHAR)
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sta WTab+1
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ldy #0
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sty Width
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sty Width+1 ; Zero the total width
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; Sum up the widths of the single characters
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@L2: ldy #0
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lda (Text),y ; Get next char
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beq @L4 ; Bail out if end of text reached
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jsr _toascii ; Convert to ascii
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tay
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lda (WTab),y ; Get width of this char
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clc
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adc Width
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sta Width
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bcc @L3
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inc Width+1
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@L3: inc Text
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bne @L2
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inc Text+1
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bne @L2
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; We have the total width now, scale and return it
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@L4: lda _tgi_textscalew
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ldx _tgi_textscalew+1
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jmp tgi_imulround
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; Exit point if no font installed
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@L9: rts
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.endproc
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