source: xtideuniversalbios/trunk/Assembly_Library/Src/Menu/CharOutLineSplitter.asm@ 374

Last change on this file since 374 was 369, checked in by gregli@…, 13 years ago

Removed align directives for initalization code and added define for align in boot-time calls to the assembly library (defaulting to 1), resulting in a significant savings for the AT and 386 builds. Fixed a bug with switch command line handling in the serial server. Put in CR characters in licesnse.txt, so that it properly displays on Windows. In the configurator, added default values for user supplied CHS and LBA values, defaulting to values within range when those features are enabled. Updated the copyright message in the configurator as the literal word Copyright is important.
File size: 4.8 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for splitting menu lines during character output.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; CharOutLineSplitter_PrepareForPrintingTextLines
9; Parameters:
10; SS:BP: Ptr to MENU
11; Returns:
12; Nothing
13; Corrupts registers:
14; AX, DX, DI
15;--------------------------------------------------------------------
16ALIGN MENU_JUMP_ALIGN
17CharOutLineSplitter_PrepareForPrintingTextLines:
18 ; Get first text line column offset to DX
19 call CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX
20 add al, MENU_TEXT_COLUMN_OFFSET<<1
21 xchg dx, ax
22
23 ; Get last text line column offset to AX
24 call MenuLocation_GetMaxTextLineLengthToAX
25 shl ax, 1 ; Characters to BYTEs
26 add ax, dx
27
28 xchg ax, dx ; AL = First text line column offset
29 mov ah, dl ; AH = Last text line column offset
30 CALL_DISPLAY_LIBRARY SetCharacterOutputParameterFromAX
31 ret
32
33
34;--------------------------------------------------------------------
35; CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX
36; Parameters:
37; SS:BP: Ptr to MENU
38; Returns:
39; AX: Offset to end of text line (first border area character)
40; Corrupts registers:
41; Nothing
42;--------------------------------------------------------------------
43ALIGN MENU_JUMP_ALIGN
44CharOutLineSplitter_GetFirstBorderLineColumnOffsetToAX:
45 call MenuLocation_GetTitleBordersTopLeftCoordinatesToAX
46 xor ah, ah
47 shl ax, 1
48 ret
49
50
51;--------------------------------------------------------------------
52; CharOutLineSplitter_IsCursorAtTheEndOfTextLine
53; Parameters:
54; DS: BDA segment (zero)
55; ES:DI: Ptr to cursor location in video memory
56; Returns:
57; CF: Set if end of text line
58; Clear if more characters fit on current text line
59; Corrupts registers:
60; DX
61;--------------------------------------------------------------------
62ALIGN MENU_JUMP_ALIGN
63CharOutLineSplitter_IsCursorAtTheEndOfTextLine:
64 push ax
65
66 mov dl, [VIDEO_BDA.wColumns]
67 shl dl, 1 ; DX = bytes per row
68 mov ax, di
69 div dl ; AL = row index, AH = column index
70 cmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam+1], ah
71
72 pop ax
73 ret
74
75
76;--------------------------------------------------------------------
77; CharOutLineSplitter_MovePartialWordToNewTextLine
78; Parameters:
79; AL: Character to output
80; AH: Attribute to output
81; DS: BDA segment (zero)
82; ES:DI: Ptr to end of text line in video memory
83; Returns:
84; DI: Updated to next character for new text line
85; Corrupts registers:
86; AX, DX
87;--------------------------------------------------------------------
88ALIGN MENU_JUMP_ALIGN
89CharOutLineSplitter_MovePartialWordToNewTextLine:
90 push si
91 push cx
92 push ax
93 ; Fall to .GetOffsetToPartialWordToSIandSizeToCX
94
95;--------------------------------------------------------------------
96; .GetOffsetToPartialWordToSIandSizeToCX
97; Parameters:
98; ES:DI: Ptr to space before border character
99; Returns:
100; CX: Number of bytes that needs to be moved
101; ES:SI: Ptr to beginning of partial word that needs to be moved to new line
102; Corrupts registers:
103; Nothing
104;--------------------------------------------------------------------
105.GetOffsetToPartialWordToSIandSizeToCX:
106 mov cx, di
107 mov si, di
108ALIGN MENU_JUMP_ALIGN
109.ScanNextCharacter: ; Space will always be found since one comes after border
110 dec si
111 dec si
112 cmp BYTE [es:si], ' '
113 jne SHORT .ScanNextCharacter
114 inc si
115 inc si ; SI now points one past space
116 sub cx, si
117 ; Fall to .ChangeLine
118
119;--------------------------------------------------------------------
120; .ChangeLine
121; Parameters:
122; Nothing
123; Returns:
124; Nothing
125; Corrupts registers:
126; AX, DX
127;--------------------------------------------------------------------
128.ChangeLine:
129 call MenuCharOut_PrintLFCRandAdjustOffsetForStartOfLine
130 jcxz .ReturnFromMovePartialWordToNewTextLine
131 ; Fall to .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX
132
133;--------------------------------------------------------------------
134; .MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX
135; Parameters:
136; CX: Number of BYTEs in partial word
137; DS: BDA segment (zero)
138; ES:SI: Ptr to partial word on previous line
139; ES:DI: Ptr to new empty line
140; Returns:
141; ES:DI: Ptr where to store next character
142; Corrupts registers:
143; AX, CX, DX, SI
144;--------------------------------------------------------------------
145.MovePartialWordFromPreviousLineInESSItoNewLineInESDIwithSizeInCX:
146 push si
147 push cx
148 WAIT_RETRACE_IF_NECESSARY_THEN rep movsb
149 pop cx
150 pop si
151
152 xchg di, si
153 shr cx, 1 ; Bytes to characters
154 mov al, ' '
155 call DisplayPrint_RepeatCharacterFromALwithCountInCX
156 mov di, si
157
158.ReturnFromMovePartialWordToNewTextLine:
159 pop ax
160 pop cx
161 pop si
162 ret
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