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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 257

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

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