source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/MenuCharOut.asm@ 594

; Project name  :   Assembly Library
; Description   :   Character out function for printing within menu window.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
; GNU General Public License for more details.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;


; Section containing code
SECTION .text

;--------------------------------------------------------------------
; MenuCharOut_MenuTeletypeOutputWithAutomaticLineChange
; MenuCharOut_MenuTeletypeOutput
;   Parameters:
;       AL:     Character to output
;       AH:     Attribute to output
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to video memory where to output
;       [DISPLAY_CONTEXT.wCharOutParam]:
;               Low byte  = First column offset (after CR)
;               High byte = Last column offset (when using automatic line change)
;   Returns:
;       DI:     Incremented for next character
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN MENU_JUMP_ALIGN
MenuCharOut_MenuTeletypeOutputWithAutomaticLineChange:
    call    CharOutLineSplitter_IsCursorAtTheEndOfTextLine
    jnc     SHORT MenuCharOut_MenuTeletypeOutput
    cmp     al, ' '
    jb      SHORT ReturnSinceNoNeedToStartLineWithControlCharacter
    call    CharOutLineSplitter_MovePartialWordToNewTextLine
    ; Fall to MenuCharOut_MenuTextTeletypeOutputWithAttribute

ALIGN MENU_JUMP_ALIGN
MenuCharOut_MenuTeletypeOutput:
    cmp     al, CR
    je      SHORT PrintCRandAdjustOffsetForStartOfLine
    jmp     DisplayCharOut_TeletypeOutputWithAttribute


;--------------------------------------------------------------------
; MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine
; PrintCRandAdjustOffsetForStartOfLine
;   Parameters:
;       DS:     BDA segment (zero)
;       ES:DI:  Ptr to cursor location
;       [DISPLAY_CONTEXT.wCharOutParam]:
;               Low byte  = First column offset (after CR)
;               High byte = Last column offset (when using automatic line change)
;   Returns:
;       ES:DI:  Ptr to beginning of new line
;   Corrupts registers:
;       AX, DX
;--------------------------------------------------------------------
ALIGN MENU_JUMP_ALIGN
MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine:
    mov     al, LF
    call    DisplayCharOut_BiosTeletypeOutput
    ; Fall to PrintCRandAdjustOffsetForStartOfLine

ALIGN MENU_JUMP_ALIGN
PrintCRandAdjustOffsetForStartOfLine:
    mov     al, CR
    call    DisplayCharOut_BiosTeletypeOutput
    eMOVZX  ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
    add     di, ax
ReturnSinceNoNeedToStartLineWithControlCharacter:
    ret