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56 lines
1.3 KiB
ArmAsm
56 lines
1.3 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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;-----------------------------------------------------------------------------
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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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;
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.proc _tgi_textheight
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ldy _tgi_font
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bne @L2 ; Jump if vector font
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; Return the height for the bitmap font
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lda _tgi_charheight
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ldx #0
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@L1: rts
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; Return the height for the vector font
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@L2: lda _tgi_vectorfont
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tax
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ora _tgi_vectorfont+1
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beq @L1 ; Return zero if no font
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stx ptr1
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lda _tgi_vectorfont+1
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sta ptr1+1
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ldy #TGI_VECTORFONT::TOP
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lda (ptr1),y
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ldy #TGI_VECTORFONT::BOTTOM
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clc
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adc (ptr1),y ; Total font height is top + bottom
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sta ptr1
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lda #0
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sta ptr1+1 ; Save base height in ptr1
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lda _tgi_textscaleh
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ldx _tgi_textscaleh+1 ; Get scale factor ...
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jmp tgi_imulround ; ... and return scaled result
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.endproc
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