source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayPrint.asm@ 51

Last change on this file since 51 was 48, checked in by Tomi Tilli, 14 years ago

Changes to Assembly Library:
Added functions to clear Menu Title and Information areas.
Implemented automatic line change when writing Menu Title and Information areas.
CGA snow related functions have been moved to CgaSnow.asm.
Keyboard input functions no longer produce beep for backspace.
File size: 9.4 KB
Line 
1; File name : Display.asm
2; Project name : Assembly Library
3; Created date : 26.6.2010
4; Last update : 27.9.2010
5; Author : Tomi Tilli
6; Description : Functions for display output.
7
8; Section containing code
9SECTION .text
10
11;--------------------------------------------------------------------
12; Supports following formatting types:
13; %a Specifies attribute for next character
14; %A Specifies attribute for remaining string (or until next %A)
15; %d Prints signed 16-bit decimal integer
16; %u Prints unsigned 16-bit decimal integer
17; %x Prints 16-bit hexadecimal integer
18; %s Prints string (from CS segment)
19; %S Prints string (far pointer)
20; %c Prints character
21; %t Prints character number of times (character needs to be pushed first, then repeat times)
22; %% Prints '%' character (no parameter pushed)
23;
24; Any placeholder can be set to minimum length by specifying
25; minimum number of characters. For example %8d would append spaces
26; after integer so that at least 8 characters would be printed.
27;
28; When placing '-' after number, then spaces will be used for prepending.
29; For example %8-d would prepend integer with spaces so that at least
30; 8 characters would be printed.
31;
32; DisplayPrint_FormattedNullTerminatedStringFromCSSI
33; Parameters:
34; BP: SP before pushing parameters
35; DS: BDA segment (zero)
36; CS:SI: Pointer to string to format
37; ES:DI: Ptr to cursor location in video RAM
38; Stack: Parameters for formatting placeholders.
39; Parameter for first placeholder must be pushed first.
40; Low word must pushed first for placeholders requiring
41; 32-bit parameters (two words).
42; Returns:
43; DI: Updated offset to video RAM
44; Corrupts registers:
45; AX, DX
46;--------------------------------------------------------------------
47ALIGN JUMP_ALIGN
48DisplayPrint_FormattedNullTerminatedStringFromCSSI:
49 push bp
50 push si
51 push cx
52 push bx
53 push WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
54
55 dec bp ; Point BP to...
56 dec bp ; ...first stack parameter
57 call DisplayFormat_ParseCharacters
58
59 ; Pop original character attribute
60 pop ax
61 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
62
63 pop bx
64 pop cx
65 pop si
66 pop bp
67 ret
68
69
70;--------------------------------------------------------------------
71; DisplayPrint_SignedWordFromAXWithBaseInBX
72; Parameters:
73; AX: Word to display
74; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
75; DS: BDA segment (zero)
76; ES:DI: Ptr to cursor location in video RAM
77; Returns:
78; DI: Updated offset to video RAM
79; Corrupts registers:
80; AX, DX
81;--------------------------------------------------------------------
82ALIGN JUMP_ALIGN
83DisplayPrint_SignedWordFromAXWithBaseInBX:
84 test ax, ax
85 jns SHORT DisplayPrint_WordFromAXWithBaseInBX
86
87 push ax
88 mov al, '-'
89 call DisplayPrint_CharacterFromAL
90 pop ax
91 neg ax
92 ; Fall to DisplayPrint_WordFromAXWithBaseInBX
93
94;--------------------------------------------------------------------
95; DisplayPrint_WordFromAXWithBaseInBX
96; Parameters:
97; AX: Word to display
98; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
99; DS: BDA segment (zero)
100; ES:DI: Ptr to cursor location in video RAM
101; Returns:
102; DI: Updated offset to video RAM
103; Corrupts registers:
104; AX, DX
105;--------------------------------------------------------------------
106ALIGN JUMP_ALIGN
107DisplayPrint_WordFromAXWithBaseInBX:
108 push cx
109 push bx
110
111 xor cx, cx
112ALIGN JUMP_ALIGN
113.DivideLoop:
114 xor dx, dx ; DX:AX now holds the integer
115 div bx ; Divide DX:AX by base
116 push dx ; Push remainder
117 inc cx ; Increment character count
118 test ax, ax ; All divided?
119 jnz SHORT .DivideLoop ; If not, loop
120
121 mov bx, .rgcDigitToCharacter
122ALIGN JUMP_ALIGN
123.PrintNextDigit:
124 pop ax ; Pop digit
125 eSEG cs
126 xlatb
127 call DisplayPrint_CharacterFromAL
128 loop .PrintNextDigit
129
130 pop bx
131 pop cx
132 ret
133.rgcDigitToCharacter: db "0123456789ABCDEF"
134
135
136;--------------------------------------------------------------------
137; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX
138; Parameters:
139; CX: Buffer length (characters)
140; BX:SI: Ptr to NULL terminated string
141; DS: BDA segment (zero)
142; ES:DI: Ptr to cursor location in video RAM
143; Returns:
144; DI: Updated offset to video RAM
145; Corrupts registers:
146; AX, DX
147;--------------------------------------------------------------------
148ALIGN JUMP_ALIGN
149DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
150 jcxz .NothingToPrintSinceZeroLength
151 push si
152 push cx
153
154ALIGN JUMP_ALIGN
155.PrintNextCharacter:
156 mov ds, bx
157 lodsb
158 LOAD_BDA_SEGMENT_TO ds, dx
159 call DisplayPrint_CharacterFromAL
160 loop .PrintNextCharacter
161
162 LOAD_BDA_SEGMENT_TO ds, dx
163 pop cx
164 pop si
165.NothingToPrintSinceZeroLength:
166 ret
167
168
169;--------------------------------------------------------------------
170; DisplayPrint_NullTerminatedStringFromCSSI
171; Parameters:
172; CS:SI: Ptr to NULL terminated string
173; DS: BDA segment (zero)
174; ES:DI: Ptr to cursor location in video RAM
175; Returns:
176; DI: Updated offset to video RAM
177; Corrupts registers:
178; AX, DX
179;--------------------------------------------------------------------
180ALIGN JUMP_ALIGN
181DisplayPrint_NullTerminatedStringFromCSSI:
182 push bx
183 mov bx, cs
184 call DisplayPrint_NullTerminatedStringFromBXSI
185 pop bx
186 ret
187
188
189;--------------------------------------------------------------------
190; DisplayPrint_NullTerminatedStringFromBXSI
191; Parameters:
192; DS: BDA segment (zero)
193; BX:SI: Ptr to NULL terminated string
194; ES:DI: Ptr to cursor location in video RAM
195; Returns:
196; DI: Updated offset to video RAM
197; Corrupts registers:
198; AX, DX
199;--------------------------------------------------------------------
200ALIGN JUMP_ALIGN
201DisplayPrint_NullTerminatedStringFromBXSI:
202 push si
203 push cx
204
205 xor cx, cx
206ALIGN JUMP_ALIGN
207.PrintNextCharacter:
208 mov ds, bx ; String segment to DS
209 lodsb
210 mov ds, cx ; BDA segment to DS
211 test al, al ; NULL?
212 jz SHORT .EndOfString
213 call DisplayPrint_CharacterFromAL
214 jmp SHORT .PrintNextCharacter
215
216ALIGN JUMP_ALIGN
217.EndOfString:
218 pop cx
219 pop si
220 ret
221
222
223;--------------------------------------------------------------------
224; DisplayPrint_ClearScreen
225; Parameters:
226; DS: BDA segment (zero)
227; ES:DI: Ptr to cursor location in video RAM
228; Returns:
229; Nothing
230; Corrupts registers:
231; AX, DX
232;--------------------------------------------------------------------
233ALIGN JUMP_ALIGN
234DisplayPrint_ClearScreen:
235 push di
236 xor ax, ax
237 call DisplayCursor_SetCoordinatesFromAX
238 call DisplayPage_GetColumnsToALandRowsToAH
239 call DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
240 pop di
241 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
242 ret
243
244
245;--------------------------------------------------------------------
246; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
247; Parameters:
248; AH: Area height
249; AL: Area width
250; DS: BDA segment (zero)
251; ES:DI: Ptr to cursor location in video RAM
252; Returns:
253; DI: Updated offset to video RAM
254; Corrupts registers:
255; AX, DX
256;--------------------------------------------------------------------
257ALIGN JUMP_ALIGN
258DisplayPrint_ClearAreaWithHeightInAHandWidthInAL:
259 push si
260 push cx
261 push bx
262
263 xchg bx, ax ; Area size to BX
264 call DisplayCursor_GetSoftwareCoordinatesToAX
265 xchg si, ax ; Software (Y,X) coordinates now in SI
266 xor cx, cx
267
268ALIGN JUMP_ALIGN
269.ClearRowLoop:
270 mov cl, bl ; Area width now in CX
271 mov al, SCREEN_BACKGROUND_CHARACTER
272 call DisplayPrint_RepeatCharacterFromALwithCountInCX
273
274 xchg ax, si ; Coordinates to AX
275 inc ah ; Increment row
276 mov si, ax
277 call DisplayCursor_SetCoordinatesFromAX
278 dec bh ; Decrement rows left
279 jnz SHORT .ClearRowLoop
280
281 pop bx
282 pop cx
283 pop si
284 ret
285
286
287;--------------------------------------------------------------------
288; DisplayPrint_RepeatCharacterFromALwithCountInCX
289; Parameters:
290; AL: Character to display
291; CX: Repeat count
292; DS: BDA segment (zero)
293; ES:DI: Ptr to cursor location in video RAM
294; Returns:
295; DI: Updated offset to video RAM
296; Corrupts registers:
297; AX, DX
298;--------------------------------------------------------------------
299ALIGN JUMP_ALIGN
300DisplayPrint_RepeatCharacterFromALwithCountInCX:
301 jcxz .NothingToRepeat
302 push cx
303
304ALIGN JUMP_ALIGN
305.RepeatCharacter:
306 push ax
307 call DisplayPrint_CharacterFromAL
308 pop ax
309 loop .RepeatCharacter
310
311 pop cx
312.NothingToRepeat:
313 ret
314
315
316;--------------------------------------------------------------------
317; DisplayPrint_Newline
318; Parameters:
319; DS: BDA segment (zero)
320; ES:DI: Ptr to cursor location in video RAM
321; Returns:
322; DI: Updated offset to video RAM
323; Corrupts registers:
324; AX, DX
325;--------------------------------------------------------------------
326ALIGN JUMP_ALIGN
327DisplayPrint_Newline:
328 mov al, CR
329 call DisplayPrint_CharacterFromAL
330 mov al, LF
331 ; Fall to DisplayPrint_CharacterFromAL
332
333
334;--------------------------------------------------------------------
335; DisplayPrint_CharacterFromAL
336; Parameters:
337; AL: Character to display
338; DS: BDA segment (zero)
339; ES:DI: Ptr to cursor location in video RAM
340; Returns:
341; DI: Updated offset to video RAM
342; Corrupts registers:
343; AX, DX
344;--------------------------------------------------------------------
345ALIGN JUMP_ALIGN
346DisplayPrint_CharacterFromAL:
347 mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
348 jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]
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