[52] | 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for splitting menu lines during character output.
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| 3 |
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[376] | 4 | ;
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[445] | 5 | ; XTIDE Universal BIOS and Associated Tools
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[376] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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[445] | 12 | ;
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[376] | 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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[445] | 16 | ; GNU General Public License for more details.
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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[445] | 20 |
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[52] | 21 | ; Section containing code
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| 22 | SECTION .text
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| 23 |
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| 24 | ;--------------------------------------------------------------------
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| 25 | ; CharOutLineSplitter_PrepareForPrintingTextLines
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| 26 | ; Parameters:
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| 27 | ; SS:BP: Ptr to MENU
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| 28 | ; Returns:
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| 29 | ; Nothing
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| 30 | ; Corrupts registers:
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| 31 | ; AX, DX, DI
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| 32 | ;--------------------------------------------------------------------
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[369] | 33 | ALIGN MENU_JUMP_ALIGN
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[52] | 34 | CharOutLineSplitter_PrepareForPrintingTextLines:
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[104] | 35 | ; Get first text line column offset to DX
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| 36 | call CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX
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| 37 | add al, MENU_TEXT_COLUMN_OFFSET<<1
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| 38 | xchg dx, ax
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[52] | 39 |
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[104] | 40 | ; Get last text line column offset to AX
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[52] | 41 | call MenuLocation_GetMaxTextLineLengthToAX
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[445] | 42 | eSHL_IM ax, 1 ; Characters to BYTEs
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[104] | 43 | add ax, dx
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| 44 |
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| 45 | xchg ax, dx ; AL = First text line column offset
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| 46 | mov ah, dl ; AH = Last text line column offset
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| 47 | CALL_DISPLAY_LIBRARY SetCharacterOutputParameterFromAX
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[52] | 48 | ret
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| 49 |
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| 50 |
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| 51 | ;--------------------------------------------------------------------
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| 52 | ; CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX
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| 53 | ; Parameters:
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| 54 | ; SS:BP: Ptr to MENU
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| 55 | ; Returns:
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| 56 | ; AX: Offset to end of text line (first border area character)
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| 57 | ; Corrupts registers:
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| 58 | ; Nothing
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| 59 | ;--------------------------------------------------------------------
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[369] | 60 | ALIGN MENU_JUMP_ALIGN
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[52] | 61 | CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX:
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| 62 | call MenuLocation_GetTitleBordersTopLeftCoordinatesToAX
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| 63 | xor ah, ah
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[445] | 64 | eSHL_IM ax, 1
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[52] | 65 | ret
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| 66 |
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| 67 |
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| 68 | ;--------------------------------------------------------------------
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| 69 | ; CharOutLineSplitter_IsCursorAtTheEndOfTextLine
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| 70 | ; Parameters:
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| 71 | ; DS: BDA segment (zero)
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| 72 | ; ES:DI: Ptr to cursor location in video memory
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| 73 | ; Returns:
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| 74 | ; CF: Set if end of text line
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| 75 | ; Clear if more characters fit on current text line
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| 76 | ; Corrupts registers:
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| 77 | ; DX
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| 78 | ;--------------------------------------------------------------------
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[369] | 79 | ALIGN MENU_JUMP_ALIGN
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[52] | 80 | CharOutLineSplitter_IsCursorAtTheEndOfTextLine:
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| 81 | push ax
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| 82 |
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| 83 | mov dl, [VIDEO_BDA.wColumns]
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[445] | 84 | eSHL_IM dl, 1 ; DX = bytes per row
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[52] | 85 | mov ax, di
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| 86 | div dl ; AL = row index, AH = column index
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| 87 | cmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam+1], ah
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| 88 |
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| 89 | pop ax
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| 90 | ret
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| 91 |
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| 92 |
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| 93 | ;--------------------------------------------------------------------
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| 94 | ; CharOutLineSplitter_MovePartialWordToNewTextLine
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| 95 | ; Parameters:
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| 96 | ; AL: Character to output
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| 97 | ; AH: Attribute to output
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| 98 | ; DS: BDA segment (zero)
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| 99 | ; ES:DI: Ptr to end of text line in video memory
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| 100 | ; Returns:
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| 101 | ; DI: Updated to next character for new text line
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| 102 | ; Corrupts registers:
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| 103 | ; AX, DX
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| 104 | ;--------------------------------------------------------------------
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[369] | 105 | ALIGN MENU_JUMP_ALIGN
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[52] | 106 | CharOutLineSplitter_MovePartialWordToNewTextLine:
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| 107 | push si
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| 108 | push cx
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| 109 | push ax
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[104] | 110 | ; Fall to .GetOffsetToPartialWordToSIandSizeToCX
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[52] | 111 |
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| 112 | ;--------------------------------------------------------------------
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[104] | 113 | ; .GetOffsetToPartialWordToSIandSizeToCX
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[52] | 114 | ; Parameters:
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| 115 | ; ES:DI: Ptr to space before border character
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| 116 | ; Returns:
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| 117 | ; CX: Number of bytes that needs to be moved
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| 118 | ; ES:SI: Ptr to beginning of partial word that needs to be moved to new line
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| 119 | ; Corrupts registers:
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| 120 | ; Nothing
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| 121 | ;--------------------------------------------------------------------
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[104] | 122 | .GetOffsetToPartialWordToSIandSizeToCX:
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[181] | 123 | mov cx, di
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[52] | 124 | mov si, di
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[369] | 125 | ALIGN MENU_JUMP_ALIGN
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[52] | 126 | .ScanNextCharacter: ; Space will always be found since one comes after border
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| 127 | dec si
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| 128 | dec si
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| 129 | cmp BYTE [es:si], ' '
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[181] | 130 | jne SHORT .ScanNextCharacter
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[52] | 131 | inc si
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| 132 | inc si ; SI now points one past space
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[181] | 133 | sub cx, si
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[104] | 134 | ; Fall to .ChangeLine
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[52] | 135 |
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[104] | 136 | ;--------------------------------------------------------------------
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| 137 | ; .ChangeLine
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| 138 | ; Parameters:
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| 139 | ; Nothing
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| 140 | ; Returns:
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| 141 | ; Nothing
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| 142 | ; Corrupts registers:
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| 143 | ; AX, DX
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| 144 | ;--------------------------------------------------------------------
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| 145 | .ChangeLine:
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| 146 | call MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine
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| 147 | jcxz .ReturnFromMovePartialWordToNewTextLine
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| 148 | ; Fall to .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX
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[52] | 149 |
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| 150 | ;--------------------------------------------------------------------
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[104] | 151 | ; .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX
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[52] | 152 | ; Parameters:
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| 153 | ; CX: Number of BYTEs in partial word
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| 154 | ; DS: BDA segment (zero)
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| 155 | ; ES:SI: Ptr to partial word on previous line
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| 156 | ; ES:DI: Ptr to new empty line
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| 157 | ; Returns:
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| 158 | ; ES:DI: Ptr where to store next character
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| 159 | ; Corrupts registers:
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| 160 | ; AX, CX, DX, SI
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| 161 | ;--------------------------------------------------------------------
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[104] | 162 | .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX:
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[52] | 163 | push si
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| 164 | push cx
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| 165 | WAIT_RETRACE_IF_NECESSARY_THEN rep movsb
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| 166 | pop cx
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| 167 | pop si
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| 168 |
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| 169 | xchg di, si
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| 170 | shr cx, 1 ; Bytes to characters
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| 171 | mov al, ' '
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| 172 | call DisplayPrint_RepeatCharacterFromALwithCountInCX
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| 173 | mov di, si
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[104] | 174 |
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| 175 | .ReturnFromMovePartialWordToNewTextLine:
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| 176 | pop ax
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| 177 | pop cx
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| 178 | pop si
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[52] | 179 | ret
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