181 lines
4.2 KiB
NASM
181 lines
4.2 KiB
NASM
; ***************************************************************************
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; copyright : (C) 2025 by Martin Preuss
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; email : martin@libchipcard.de
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;
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; ***************************************************************************
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; * This file is part of the project "AqHome". *
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; * Please see toplevel file COPYING of that project for license details. *
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; ***************************************************************************
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#ifndef AQH_AVR_FONT_MAIN_ASM
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#define AQH_AVR_FONT_MAIN_ASM
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; ***************************************************************************
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; code
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.cseg
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; ---------------------------------------------------------------------------
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; @routine FONT_RenderChar
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; @param R16 character to write
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; @param R1:R0 background color
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; @param R3:R2 foreground color
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; @param Z pointer to font
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; @param X pointer to RAM to store data to
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; @return r18 char width in pixel
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; @return r19 char height in pixel
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; @clobbers any, !Z
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FONT_RenderChar:
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ldi r23, FONT_FN_RENDER
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rjmp fontCallHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine FONT_GetCharWidth
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; @param Z pointer to font
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; @param R16 character for which to determine size
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; @return R16 character width for given character set
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; @clobbers any, !Z
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FONT_GetCharWidth:
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ldi r23, FONT_FN_GETCHARWIDTH
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rjmp fontCallHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine FONT_GetCharHeight
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; @param Z pointer to font
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; @return R16 character height for given character set
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; @clobbers any, !Z
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FONT_GetCharHeight:
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ldi r23, FONT_FN_GETCHARHEIGHT
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rjmp fontCallHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine FONT_GetStringWidthFlash
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; @param Z pointer to font
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; @param X pointer to null-terminated string in flash
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; @return R17:R16 character width for given character set (in pixel)
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; @clobbers any, !Z
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FONT_GetStringWidthFlash:
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ldi r23, FONT_FN_GETSTRINGWIDTH
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rjmp fontCallHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine FONT_GetStringHeightFlash
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; @param Z pointer to font
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; @param X pointer to null-terminated string in flash
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; @return R16 character width for given character set
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; @clobbers any, !Z
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FONT_GetStringHeightFlash:
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ldi r23, FONT_FN_GETSTRINGHEIGHT
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rjmp fontCallHandler
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; @end
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; ---------------------------------------------------------------------------
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; @routine fontCallHandler
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;
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; @param r23 function number
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; @param Z pointer to font
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fontCallHandler:
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lpm r17, Z+
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push r17
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lpm r17, Z
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push r17
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sbiw zh:zl, 1
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ret
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; @end
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; ---------------------------------------------------------------------------
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; @routine FONT_GenericHandler
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;
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; Generic handler for font functions.
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; @param R23 function to call (see @ref FONT_FN_RENDER et al)
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FONT_GenericHandler:
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cpi r23, FONT_FN_GETCHARWIDTH
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breq fontGenericFnGetCharWidth
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cpi r23, FONT_FN_GETCHARHEIGHT
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breq fontGenericFnGetCharHeight
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cpi r23, FONT_FN_GETSTRINGWIDTH
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breq fontGenericFnGetStringWidth
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cpi r23, FONT_FN_GETSTRINGHEIGHT
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breq fontGenericFnGetStringHeight
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ret
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fontGenericFnGetCharWidth:
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adiw zh:zl, FONT_OFFS_WIDTH
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lpm r16, Z
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sbiw zh:zl, FONT_OFFS_WIDTH
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ret
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fontGenericFnGetCharHeight:
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adiw zh:zl, FONT_OFFS_HEIGHT
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lpm r16, Z
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sbiw zh:zl, FONT_OFFS_HEIGHT
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ret
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fontGenericFnGetStringWidth:
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clr r16 ; sum (LOW)
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clr r17 ; sum (HIGH)
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adiw zh:zl, FONT_OFFS_WIDTH
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lpm r19, Z
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sbiw zh:zl, FONT_OFFS_WIDTH
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push zl
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push zh
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mov zl, xl
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mov zh, xh
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fontGenericFnGetStringWidth_loop:
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lpm r18, Z+ ; current byte in string
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tst r18
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breq fontGenericFnGetStringWidth_loopEnd
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add r16, r19 ; add char width to sum
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adc r17, r19
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sub r17, r19
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rjmp fontGenericFnGetStringWidth_loop
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fontGenericFnGetStringWidth_loopEnd:
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pop zh
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pop zl
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ret
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fontGenericFnGetStringHeight:
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rjmp fontGenericFnGetCharHeight ; for now monospace fonts only
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; @end
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#endif ; AQH_AVR_FONT_MAIN_ASM
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