[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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| 4 | ; Section containing code |
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| 5 | SECTION .text |
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| 6 | |
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| 7 | ;-------------------------------------------------------------------- |
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| 8 | ; CharOutLineSplitter_PrepareForPrintingTextLines |
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| 9 | ; Parameters: |
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| 10 | ; SS:BP: Ptr to MENU |
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| 11 | ; Returns: |
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| 12 | ; Nothing |
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| 13 | ; Corrupts registers: |
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| 14 | ; AX, DX, DI |
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| 15 | ;-------------------------------------------------------------------- |
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[369] | 16 | ALIGN MENU_JUMP_ALIGN |
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[52] | 17 | CharOutLineSplitter_PrepareForPrintingTextLines: |
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[104] | 18 | ; Get first text line column offset to DX |
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| 19 | call CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX |
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| 20 | add al, MENU_TEXT_COLUMN_OFFSET<<1 |
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| 21 | xchg dx, ax |
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[52] | 22 | |
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[104] | 23 | ; Get last text line column offset to AX |
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[52] | 24 | call MenuLocation_GetMaxTextLineLengthToAX |
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[104] | 25 | shl ax, 1 ; Characters to BYTEs |
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| 26 | add ax, dx |
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| 27 | |
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| 28 | xchg ax, dx ; AL = First text line column offset |
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| 29 | mov ah, dl ; AH = Last text line column offset |
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| 30 | CALL_DISPLAY_LIBRARY SetCharacterOutputParameterFromAX |
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[52] | 31 | ret |
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| 32 | |
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| 33 | |
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| 34 | ;-------------------------------------------------------------------- |
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| 35 | ; CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX |
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| 36 | ; Parameters: |
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| 37 | ; SS:BP: Ptr to MENU |
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| 38 | ; Returns: |
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| 39 | ; AX: Offset to end of text line (first border area character) |
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| 40 | ; Corrupts registers: |
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| 41 | ; Nothing |
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| 42 | ;-------------------------------------------------------------------- |
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[369] | 43 | ALIGN MENU_JUMP_ALIGN |
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[52] | 44 | CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX: |
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| 45 | call MenuLocation_GetTitleBordersTopLeftCoordinatesToAX |
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| 46 | xor ah, ah |
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| 47 | shl ax, 1 |
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| 48 | ret |
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| 49 | |
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| 50 | |
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| 51 | ;-------------------------------------------------------------------- |
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| 52 | ; CharOutLineSplitter_IsCursorAtTheEndOfTextLine |
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| 53 | ; Parameters: |
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| 54 | ; DS: BDA segment (zero) |
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| 55 | ; ES:DI: Ptr to cursor location in video memory |
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| 56 | ; Returns: |
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| 57 | ; CF: Set if end of text line |
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| 58 | ; Clear if more characters fit on current text line |
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| 59 | ; Corrupts registers: |
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| 60 | ; DX |
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| 61 | ;-------------------------------------------------------------------- |
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[369] | 62 | ALIGN MENU_JUMP_ALIGN |
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[52] | 63 | CharOutLineSplitter_IsCursorAtTheEndOfTextLine: |
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| 64 | push ax |
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| 65 | |
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| 66 | mov dl, [VIDEO_BDA.wColumns] |
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| 67 | shl dl, 1 ; DX = bytes per row |
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| 68 | mov ax, di |
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| 69 | div dl ; AL = row index, AH = column index |
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| 70 | cmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam+1], ah |
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| 71 | |
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| 72 | pop ax |
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| 73 | ret |
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| 74 | |
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| 75 | |
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| 76 | ;-------------------------------------------------------------------- |
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| 77 | ; CharOutLineSplitter_MovePartialWordToNewTextLine |
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| 78 | ; Parameters: |
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| 79 | ; AL: Character to output |
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| 80 | ; AH: Attribute to output |
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| 81 | ; DS: BDA segment (zero) |
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| 82 | ; ES:DI: Ptr to end of text line in video memory |
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| 83 | ; Returns: |
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| 84 | ; DI: Updated to next character for new text line |
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| 85 | ; Corrupts registers: |
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| 86 | ; AX, DX |
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| 87 | ;-------------------------------------------------------------------- |
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[369] | 88 | ALIGN MENU_JUMP_ALIGN |
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[52] | 89 | CharOutLineSplitter_MovePartialWordToNewTextLine: |
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| 90 | push si |
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| 91 | push cx |
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| 92 | push ax |
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[104] | 93 | ; Fall to .GetOffsetToPartialWordToSIandSizeToCX |
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[52] | 94 | |
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| 95 | ;-------------------------------------------------------------------- |
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[104] | 96 | ; .GetOffsetToPartialWordToSIandSizeToCX |
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[52] | 97 | ; Parameters: |
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| 98 | ; ES:DI: Ptr to space before border character |
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| 99 | ; Returns: |
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| 100 | ; CX: Number of bytes that needs to be moved |
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| 101 | ; ES:SI: Ptr to beginning of partial word that needs to be moved to new line |
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| 102 | ; Corrupts registers: |
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| 103 | ; Nothing |
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| 104 | ;-------------------------------------------------------------------- |
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[104] | 105 | .GetOffsetToPartialWordToSIandSizeToCX: |
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[181] | 106 | mov cx, di |
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[52] | 107 | mov si, di |
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[369] | 108 | ALIGN MENU_JUMP_ALIGN |
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[52] | 109 | .ScanNextCharacter: ; Space will always be found since one comes after border |
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| 110 | dec si |
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| 111 | dec si |
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| 112 | cmp BYTE [es:si], ' ' |
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[181] | 113 | jne SHORT .ScanNextCharacter |
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[52] | 114 | inc si |
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| 115 | inc si ; SI now points one past space |
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[181] | 116 | sub cx, si |
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[104] | 117 | ; Fall to .ChangeLine |
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[52] | 118 | |
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[104] | 119 | ;-------------------------------------------------------------------- |
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| 120 | ; .ChangeLine |
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| 121 | ; Parameters: |
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| 122 | ; Nothing |
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| 123 | ; Returns: |
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| 124 | ; Nothing |
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| 125 | ; Corrupts registers: |
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| 126 | ; AX, DX |
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| 127 | ;-------------------------------------------------------------------- |
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| 128 | .ChangeLine: |
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| 129 | call MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine |
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| 130 | jcxz .ReturnFromMovePartialWordToNewTextLine |
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| 131 | ; Fall to .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX |
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[52] | 132 | |
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| 133 | ;-------------------------------------------------------------------- |
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[104] | 134 | ; .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX |
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[52] | 135 | ; Parameters: |
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| 136 | ; CX: Number of BYTEs in partial word |
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| 137 | ; DS: BDA segment (zero) |
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| 138 | ; ES:SI: Ptr to partial word on previous line |
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| 139 | ; ES:DI: Ptr to new empty line |
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| 140 | ; Returns: |
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| 141 | ; ES:DI: Ptr where to store next character |
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| 142 | ; Corrupts registers: |
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| 143 | ; AX, CX, DX, SI |
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| 144 | ;-------------------------------------------------------------------- |
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[104] | 145 | .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX: |
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[52] | 146 | push si |
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| 147 | push cx |
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| 148 | WAIT_RETRACE_IF_NECESSARY_THEN rep movsb |
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| 149 | pop cx |
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| 150 | pop si |
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| 151 | |
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| 152 | xchg di, si |
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| 153 | shr cx, 1 ; Bytes to characters |
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| 154 | mov al, ' ' |
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| 155 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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| 156 | mov di, si |
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[104] | 157 | |
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| 158 | .ReturnFromMovePartialWordToNewTextLine: |
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| 159 | pop ax |
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| 160 | pop cx |
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| 161 | pop si |
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[52] | 162 | ret |
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