[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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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 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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[505] | 47 | JMP_DISPLAY_LIBRARY SetCharacterOutputParameterFromAX |
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[52] | 48 | |
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| 49 | |
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| 50 | ;-------------------------------------------------------------------- |
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| 51 | ; CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX |
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| 52 | ; Parameters: |
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| 53 | ; SS:BP: Ptr to MENU |
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| 54 | ; Returns: |
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| 55 | ; AX: Offset to end of text line (first border area character) |
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| 56 | ; Corrupts registers: |
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| 57 | ; Nothing |
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| 58 | ;-------------------------------------------------------------------- |
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[369] | 59 | ALIGN MENU_JUMP_ALIGN |
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[52] | 60 | CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX: |
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| 61 | call MenuLocation_GetTitleBordersTopLeftCoordinatesToAX |
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| 62 | xor ah, ah |
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[445] | 63 | eSHL_IM ax, 1 |
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[52] | 64 | ret |
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| 65 | |
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| 66 | |
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| 67 | ;-------------------------------------------------------------------- |
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| 68 | ; CharOutLineSplitter_IsCursorAtTheEndOfTextLine |
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| 69 | ; Parameters: |
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| 70 | ; DS: BDA segment (zero) |
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| 71 | ; ES:DI: Ptr to cursor location in video memory |
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| 72 | ; Returns: |
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| 73 | ; CF: Set if end of text line |
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| 74 | ; Clear if more characters fit on current text line |
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| 75 | ; Corrupts registers: |
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| 76 | ; DX |
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| 77 | ;-------------------------------------------------------------------- |
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[369] | 78 | ALIGN MENU_JUMP_ALIGN |
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[52] | 79 | CharOutLineSplitter_IsCursorAtTheEndOfTextLine: |
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| 80 | push ax |
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| 81 | |
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| 82 | mov dl, [VIDEO_BDA.wColumns] |
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[445] | 83 | eSHL_IM dl, 1 ; DX = bytes per row |
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[52] | 84 | mov ax, di |
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| 85 | div dl ; AL = row index, AH = column index |
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| 86 | cmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam+1], ah |
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| 87 | |
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| 88 | pop ax |
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| 89 | ret |
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| 90 | |
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| 91 | |
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| 92 | ;-------------------------------------------------------------------- |
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| 93 | ; CharOutLineSplitter_MovePartialWordToNewTextLine |
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| 94 | ; Parameters: |
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| 95 | ; AL: Character to output |
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| 96 | ; AH: Attribute to output |
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| 97 | ; DS: BDA segment (zero) |
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| 98 | ; ES:DI: Ptr to end of text line in video memory |
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| 99 | ; Returns: |
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| 100 | ; DI: Updated to next character for new text line |
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| 101 | ; Corrupts registers: |
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| 102 | ; AX, DX |
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| 103 | ;-------------------------------------------------------------------- |
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[369] | 104 | ALIGN MENU_JUMP_ALIGN |
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[52] | 105 | CharOutLineSplitter_MovePartialWordToNewTextLine: |
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| 106 | push si |
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| 107 | push cx |
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| 108 | push ax |
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[104] | 109 | ; Fall to .GetOffsetToPartialWordToSIandSizeToCX |
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[52] | 110 | |
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| 111 | ;-------------------------------------------------------------------- |
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[104] | 112 | ; .GetOffsetToPartialWordToSIandSizeToCX |
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[52] | 113 | ; Parameters: |
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| 114 | ; ES:DI: Ptr to space before border character |
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| 115 | ; Returns: |
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| 116 | ; CX: Number of bytes that needs to be moved |
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| 117 | ; ES:SI: Ptr to beginning of partial word that needs to be moved to new line |
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| 118 | ; Corrupts registers: |
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| 119 | ; Nothing |
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| 120 | ;-------------------------------------------------------------------- |
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[104] | 121 | .GetOffsetToPartialWordToSIandSizeToCX: |
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[181] | 122 | mov cx, di |
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[52] | 123 | mov si, di |
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[369] | 124 | ALIGN MENU_JUMP_ALIGN |
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[52] | 125 | .ScanNextCharacter: ; Space will always be found since one comes after border |
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| 126 | dec si |
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| 127 | dec si |
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| 128 | cmp BYTE [es:si], ' ' |
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[181] | 129 | jne SHORT .ScanNextCharacter |
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[52] | 130 | inc si |
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| 131 | inc si ; SI now points one past space |
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[181] | 132 | sub cx, si |
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[104] | 133 | ; Fall to .ChangeLine |
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[52] | 134 | |
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[104] | 135 | ;-------------------------------------------------------------------- |
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| 136 | ; .ChangeLine |
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| 137 | ; Parameters: |
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| 138 | ; Nothing |
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| 139 | ; Returns: |
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| 140 | ; Nothing |
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| 141 | ; Corrupts registers: |
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| 142 | ; AX, DX |
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| 143 | ;-------------------------------------------------------------------- |
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| 144 | .ChangeLine: |
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| 145 | call MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine |
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| 146 | jcxz .ReturnFromMovePartialWordToNewTextLine |
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| 147 | ; Fall to .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX |
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[52] | 148 | |
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| 149 | ;-------------------------------------------------------------------- |
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[104] | 150 | ; .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX |
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[52] | 151 | ; Parameters: |
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| 152 | ; CX: Number of BYTEs in partial word |
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| 153 | ; DS: BDA segment (zero) |
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| 154 | ; ES:SI: Ptr to partial word on previous line |
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| 155 | ; ES:DI: Ptr to new empty line |
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| 156 | ; Returns: |
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| 157 | ; ES:DI: Ptr where to store next character |
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| 158 | ; Corrupts registers: |
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| 159 | ; AX, CX, DX, SI |
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| 160 | ;-------------------------------------------------------------------- |
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[104] | 161 | .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX: |
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[52] | 162 | push si |
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| 163 | push cx |
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| 164 | WAIT_RETRACE_IF_NECESSARY_THEN rep movsb |
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| 165 | pop cx |
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| 166 | pop si |
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| 167 | |
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| 168 | xchg di, si |
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| 169 | shr cx, 1 ; Bytes to characters |
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| 170 | mov al, ' ' |
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| 171 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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| 172 | mov di, si |
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[104] | 173 | |
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| 174 | .ReturnFromMovePartialWordToNewTextLine: |
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| 175 | pop ax |
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| 176 | pop cx |
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| 177 | pop si |
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[52] | 178 | ret |
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