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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayPrint.asm @ 52

Last change on this file since 52 was 52, checked in by aitotat, 14 years ago
Changes to Assembly Library: Completely rewritten line splitting (slower but no need to modify string). Some changes to string processing functions. Saved few bytes from CGA detection.
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 : 11.10.2010
5	; Author : Tomi Tilli
6	; Description : Functions for display output.
7
8	; Section containing code
9	SECTION .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	;--------------------------------------------------------------------
47	ALIGN JUMP_ALIGN
48	DisplayPrint_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	;--------------------------------------------------------------------
82	ALIGN JUMP_ALIGN
83	DisplayPrint_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	;--------------------------------------------------------------------
106	ALIGN JUMP_ALIGN
107	DisplayPrint_WordFromAXWithBaseInBX:
108	push cx
109	push bx
110
111	xor cx, cx
112	ALIGN 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
122	ALIGN 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	;--------------------------------------------------------------------
148	ALIGN JUMP_ALIGN
149	DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
150	jcxz .NothingToPrintSinceZeroLength
151	push si
152	push cx
153
154	ALIGN 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	;--------------------------------------------------------------------
180	ALIGN JUMP_ALIGN
181	DisplayPrint_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	;--------------------------------------------------------------------
200	ALIGN JUMP_ALIGN
201	DisplayPrint_NullTerminatedStringFromBXSI:
202	push si
203	push cx
204
205	xor cx, cx
206	ALIGN 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
216	ALIGN 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	;--------------------------------------------------------------------
233	ALIGN JUMP_ALIGN
234	DisplayPrint_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	;--------------------------------------------------------------------
257	ALIGN JUMP_ALIGN
258	DisplayPrint_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
268	ALIGN 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	;--------------------------------------------------------------------
299	ALIGN JUMP_ALIGN
300	DisplayPrint_RepeatCharacterFromALwithCountInCX:
301	jcxz .NothingToRepeat
302	push cx
303
304	ALIGN 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	;--------------------------------------------------------------------
326	ALIGN JUMP_ALIGN
327	DisplayPrint_Newline:
328	mov al, LF
329	call DisplayPrint_CharacterFromAL
330	mov al, CR
331	; Fall to DisplayPrint_CharacterFromAL
332
333	;--------------------------------------------------------------------
334	; DisplayPrint_CharacterFromAL
335	; Parameters:
336	; AL: Character to display
337	; DS: BDA segment (zero)
338	; ES:DI: Ptr to cursor location in video RAM
339	; Returns:
340	; DI: Updated offset to video RAM
341	; Corrupts registers:
342	; AX, DX
343	;--------------------------------------------------------------------
344	ALIGN JUMP_ALIGN
345	DisplayPrint_CharacterFromAL:
346	mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
347	jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]

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