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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 316

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Last change on this file since 316 was 287, checked in by aitotat@…, 12 years ago

Changes to Assembly Library:

Hopefully fixed a problem of wrong sized MDA cursor.
Some minor improvements.

File size: 9.7 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for managing display context.
	3
	4	; Section containing code
	5	SECTION .text
	6
	7	;--------------------------------------------------------------------
	8	; DisplayContext_Initialize
	9	; Parameters:
	10	; DS: BDA segment (zero)
	11	; Returns:
	12	; Nothing
	13	; Corrupts registers:
	14	; AX, DX, DI
	15	;--------------------------------------------------------------------
	16	ALIGN JUMP_ALIGN
	17	DisplayContext_Initialize:
	18	mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
[44]	19	mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
[287]	20	mov ax, [VIDEO_BDA.wCursorShape]
	21	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax
[101]	22	; Fall to .DetectAndSetDisplaySegment
[41]	23
	24	;--------------------------------------------------------------------
	25	; .DetectAndSetDisplaySegment
	26	; Parameters:
	27	; DS: BDA segment (zero)
	28	; Returns:
	29	; Nothing
	30	; Corrupts registers:
[50]	31	; AX, DX
[41]	32	;--------------------------------------------------------------------
	33	.DetectAndSetDisplaySegment:
[50]	34	mov ax, COLOR_TEXT_SEGMENT
[41]	35	cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
[101]	36	eCMOVE ah, MONO_TEXT_SEGMENT >> 8
[50]	37	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax
[101]	38	; Fall to .InitializeFlags
[50]	39
	40	;--------------------------------------------------------------------
	41	; .InitializeFlags
	42	; Parameters:
	43	; DS: BDA segment (zero)
	44	; Returns:
	45	; Nothing
	46	; Corrupts registers:
	47	; AX, DX
	48	;--------------------------------------------------------------------
	49	.InitializeFlags:
	50	mov dl, FLG_CONTEXT_ATTRIBUTES
	51	call CgaSnow_IsCgaPresent
	52	jnc SHORT .DoNotSetCgaFlag
	53	or dl, FLG_CONTEXT_CGA
	54	.DoNotSetCgaFlag:
	55	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl
[101]	56	; Fall to .InitializeCursor
[41]	57
[101]	58	;--------------------------------------------------------------------
	59	; .InitializeCursor
	60	; Parameters:
	61	; DS: BDA segment (zero)
	62	; Returns:
	63	; Nothing
	64	; Corrupts registers:
	65	; AX, DX
	66	;--------------------------------------------------------------------
	67	.InitializeCursor:
[115]	68	call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init
	69	call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context
[101]	70	; Fall to DisplayContext_SynchronizeToHardware
[41]	71
	72	;--------------------------------------------------------------------
[101]	73	; DisplayContext_SynchronizeToHardware
	74	; Parameters:
	75	; DS: BDA segment (zero)
	76	; Returns:
	77	; Nothing
	78	; Corrupts registers:
	79	; AX, DX
	80	;--------------------------------------------------------------------
	81	ALIGN JUMP_ALIGN
	82	DisplayContext_SynchronizeToHardware:
	83	call DisplayPage_SynchronizeToHardware
	84	call DisplayCursor_SynchronizeShapeToHardware
	85	jmp DisplayCursor_SynchronizeCoordinatesToHardware
	86
	87
	88	;--------------------------------------------------------------------
[41]	89	; DisplayContext_Push
	90	; Parameters:
	91	; Nothing
	92	; Returns:
	93	; Nothing
	94	; Corrupts registers:
	95	; AX, DI
	96	;--------------------------------------------------------------------
	97	ALIGN JUMP_ALIGN
	98	DisplayContext_Push:
	99	mov di, ds ; Backup DS
	100	LOAD_BDA_SEGMENT_TO ds, ax
	101	pop ax ; Pop return address
	102
[194]	103	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	104	%assign i 0
	105	%rep DISPLAY_CONTEXT_size / 2
	106	push WORD [VIDEO_BDA.displayContext + i]
	107	%assign i i+2
	108	%endrep
[194]	109	%endif
	110
[41]	111	mov ds, di ; Restore DS
	112	jmp ax
	113
	114	;--------------------------------------------------------------------
	115	; DisplayContext_Pop
	116	; Parameters:
	117	; Nothing
	118	; Returns:
	119	; Nothing
	120	; Corrupts registers:
	121	; AX, DI
	122	;--------------------------------------------------------------------
	123	ALIGN JUMP_ALIGN
	124	DisplayContext_Pop:
	125	mov di, ds ; Backup DS
	126	LOAD_BDA_SEGMENT_TO ds, ax
	127	pop ax ; Pop return address
	128
[194]	129	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	130	%assign i DISPLAY_CONTEXT_size-2
	131	%rep DISPLAY_CONTEXT_size / 2
	132	pop WORD [VIDEO_BDA.displayContext + i]
	133	%assign i i-2
	134	%endrep
[194]	135	%endif
	136
[41]	137	push ax ; Push return address
	138	push dx
	139	call DisplayContext_SynchronizeToHardware
	140	pop dx
	141	mov ds, di ; Restore DS
	142	ret
	143
	144
	145	;--------------------------------------------------------------------
[52]	146	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	147	; Parameters:
[52]	148	; CX: Off screen buffer length in characters
	149	; ES:BX: Ptr to off screen buffer
[48]	150	; Returns:
	151	; Nothing
	152	; Corrupts registers:
[52]	153	; AX, DI
[48]	154	;--------------------------------------------------------------------
[133]	155	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[48]	156	ALIGN JUMP_ALIGN
[52]	157	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	158	push ds
	159
	160	LOAD_BDA_SEGMENT_TO ds, di
	161	xchg ax, bx
	162	mov bx, es
	163	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	164
	165	mov bl, ATTRIBUTES_NOT_USED
	166	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	167	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	168	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	169
	170	mov bx, di
	171	pop ds
	172	ret
[133]	173	%endif
[48]	174
	175
	176	;--------------------------------------------------------------------
[41]	177	; DisplayContext_SetCharacterPointerFromBXAX
	178	; Parameters:
	179	; BX:AX: Ptr to destination for next character to output
	180	; DS: BDA segment (zero)
	181	; Returns:
[48]	182	; ES:DI: Pointer that was in BX:AX
[41]	183	; Corrupts registers:
	184	; AX
	185	;--------------------------------------------------------------------
[133]	186	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]	187	ALIGN JUMP_ALIGN
	188	DisplayContext_SetCharacterPointerFromBXAX:
	189	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	190	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	191	xchg di, ax
	192	mov es, bx
	193	ret
[133]	194	%endif
[41]	195
	196
	197	;--------------------------------------------------------------------
	198	; DisplayContext_GetCharacterPointerToBXAX
	199	; Parameters:
	200	; DS: BDA segment (zero)
	201	; Returns:
	202	; BX:AX: Ptr to destination for next character to output
	203	; Corrupts registers:
	204	; Nothing
	205	;--------------------------------------------------------------------
[133]	206	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]	207	ALIGN JUMP_ALIGN
	208	DisplayContext_GetCharacterPointerToBXAX:
	209	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	210	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	211	ret
[133]	212	%endif
[41]	213
	214
	215	;--------------------------------------------------------------------
[45]	216	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	217	; Parameters:
	218	; AX: Offset to character output function
[45]	219	; BL: Attribute Flag
[41]	220	; DS: BDA segment (zero)
	221	; Returns:
	222	; Nothing
	223	; Corrupts registers:
[50]	224	; BL
[41]	225	;--------------------------------------------------------------------
	226	ALIGN JUMP_ALIGN
[45]	227	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	228	and bl, FLG_CONTEXT_ATTRIBUTES
	229	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	230	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	231	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	232	ret
[194]	233
[41]	234
	235	;--------------------------------------------------------------------
	236	; DisplayContext_SetCharacterAttributeFromAL
	237	; Parameters:
	238	; AL: Character attribute
	239	; DS: BDA segment (zero)
	240	; Returns:
	241	; Nothing
	242	; Corrupts registers:
	243	; Nothing
	244	;--------------------------------------------------------------------
	245	ALIGN JUMP_ALIGN
	246	DisplayContext_SetCharacterAttributeFromAL:
	247	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	248	ret
	249
	250
	251	;--------------------------------------------------------------------
	252	; DisplayContext_SetCharacterOutputParameterFromAX
	253	; Parameters:
	254	; AX: Parameter for Character Output function
	255	; DS: BDA segment (zero)
	256	; Returns:
	257	; Nothing
	258	; Corrupts registers:
	259	; Nothing
	260	;--------------------------------------------------------------------
	261	ALIGN JUMP_ALIGN
	262	DisplayContext_SetCharacterOutputParameterFromAX:
	263	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	264	ret
	265
[194]	266
[41]	267	;--------------------------------------------------------------------
	268	; DisplayContext_GetCharacterOutputParameterToDX
	269	; Parameters:
	270	; DS: BDA segment (zero)
	271	; Returns:
	272	; DX: User parameter for Character Output function
	273	; Corrupts registers:
	274	; Nothing
[133]	275	;--------------------------------------------------------------------
[181]	276	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code)
	277	ALIGN JUMP_ALIGN
	278	DisplayContext_GetCharacterOutputParameterToDX:
	279	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	280	ret
	281	%endif
[44]	282
	283
	284	;--------------------------------------------------------------------
	285	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	286	; Parameters:
	287	; AX: Offset in bytes from some character to another
	288	; DS: BDA segment (zero)
	289	; Returns:
	290	; AX: Offset in characters from some character to another
	291	; Corrupts registers:
	292	; Nothing
[133]	293	;--------------------------------------------------------------------
[201]	294	%ifndef MODULE_STRINGS_COMPRESSED
[44]	295	ALIGN JUMP_ALIGN
	296	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	297	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	298	jz SHORT ReturnOffsetInAX
	299	sar ax, 1 ; BYTE count to WORD count
	300	ret
[194]	301	%endif
[44]	302
[194]	303
[44]	304	;--------------------------------------------------------------------
	305	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	306	; Parameters:
	307	; AX: Offset in characters from some character to another
	308	; DS: BDA segment (zero)
	309	; Returns:
	310	; AX: Offset in bytes from some character to another
	311	; Corrupts registers:
	312	; Nothing
[133]	313	;--------------------------------------------------------------------
[201]	314	%ifndef MODULE_STRINGS_COMPRESSED
[44]	315	ALIGN JUMP_ALIGN
	316	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	317	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	318	jz SHORT ReturnOffsetInAX
	319	sal ax, 1 ; WORD count to BYTE count
	320	ALIGN JUMP_ALIGN, ret
	321	ReturnOffsetInAX:
	322	ret
[194]	323	%endif

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