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 | ;
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5 | ; XTIDE Universal BIOS and Associated Tools
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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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12 | ;
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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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16 | ; GNU General Public License for more details.
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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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20 |
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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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33 | ALIGN MENU_JUMP_ALIGN
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34 | CharOutLineSplitter_PrepareForPrintingTextLines:
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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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39 |
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40 | ; Get last text line column offset to AX
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41 | call MenuLocation_GetMaxTextLineLengthToAX
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42 | eSHL_IM ax, 1 ; Characters to BYTEs
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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 | JMP_DISPLAY_LIBRARY SetCharacterOutputParameterFromAX
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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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59 | ALIGN MENU_JUMP_ALIGN
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60 | CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX:
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61 | call MenuLocation_GetTitleBordersTopLeftCoordinatesToAX
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62 | xor ah, ah
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63 | eSHL_IM ax, 1
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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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78 | ALIGN MENU_JUMP_ALIGN
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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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83 | eSHL_IM dl, 1 ; DX = bytes per row
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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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104 | ALIGN MENU_JUMP_ALIGN
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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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109 | ; Fall to .GetOffsetToPartialWordToSIandSizeToCX
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110 |
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111 | ;--------------------------------------------------------------------
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112 | ; .GetOffsetToPartialWordToSIandSizeToCX
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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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121 | .GetOffsetToPartialWordToSIandSizeToCX:
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122 | mov cx, di
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123 | mov si, di
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124 | ALIGN MENU_JUMP_ALIGN
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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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129 | jne SHORT .ScanNextCharacter
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130 | inc si
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131 | inc si ; SI now points one past space
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132 | sub cx, si
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133 | ; Fall to .ChangeLine
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134 |
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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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148 |
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149 | ;--------------------------------------------------------------------
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150 | ; .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX
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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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161 | .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX:
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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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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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178 | ret
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