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0063_3 Fast Write Routines.pas
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Pascal/Delphi Source File
|
1994-02-18
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5KB
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141 lines
{
From: ALEX CHALFIN
Subj: fast write
}
Procedure FastWrite(WX, WY : Integer; Var s); Assembler;
Asm
PUSH DS
MOV AX,$B800
MOV ES,AX
XOR DI,DI
LDS SI,s
{ CALL WhereY }
MOV AX,WY
DEC AX
MOV DX,160
IMUL DX
PUSH AX
XOR CX,CX
{CALL WhereY }
MOV AX,WY
MOV BX,AX
POP AX
DEC BX
SHL BX,1
ADD AX,BX
MOV DI,AX
XOR AX,AX
LODSB
MOV CX,AX
MOV AH,TextAttr
@Top:
LODSB
STOSW
LOOP @Top
POP DS
End;
{
From: BOB SWART
Subj: fast write
}
procedure FastWrite(Col,Row,Attr: Byte; Str: String); Assembler;
ASM
push DS { Save DS }
mov CH,Row { CH = Row }
mov BL,Col { BL = Column }
{ Set up ES:DI for LDS }
xor AX,AX { AX = 0 }
mov CL,AL { CL = 0 }
mov BH,AL { BH = 0 }
dec CH { convert to DOS 0..24 coords }
shr CX,1 { CX = Row * 128 }
mov DI,CX { Store in DI }
shr DI,1 { DI = Row * 64 }
shr DI,1 { DI = Row * 32 }
add DI,CX { DI = (Row * 160) }
dec BX { convert to DOS 0..79 coords }
shl BX,1 { Account for attribute bytes }
add DI,BX { DI = (Row * 160) + (Col * 2) }
add DI,0 { Add base address }
mov ES,BaseOfScreen { ES:DI points to first Row,Col Attr }
mov CL,CheckSnow { Need to wait? }
lds SI,Str { DS:SI points to Str[0] }
cld { Set direction to forward }
lodsb { AX = Length(St); DS:SI -> Str[1] }
xchg AX,CX { CX = Length; AL = CheckSnow }
jcxz @Exit { exit if string empty }
mov AH,Attr { AH = display attribute }
rcr AL,1 { If CheckSnow is False... }
jnc @NoWait { use "NoWait" routine }
mov DX,CGAInfo { Point DX to CGA status port }
@GetNext:
lodsb { Load next character into AL }
mov BX,AX { Store video word in BX }
cli { hold interrupts }
@WaitNoH:
in AL,DX { get retrace situation }
test AL,8 { retracing? }
jnz @Go { If so, go }
rcr AL,1 { Else, wait for end of }
jc @WaitNoH { horizontal retrace }
@WaitH:
in AL,DX { get retrace situation }
rcr AL,1 { Wait for horizontal }
jnc @WaitH { retrace }
@Go:
mov AX,BX { Move word back to AX... }
stosw { and then to screen }
sti { OK to interrupt now }
loop @GetNext { Get next character }
jmp @Exit { wind up }
@NoWait:
lodsb { Load next character into AL }
stosw { Move video word into place }
loop @NoWait { Get next character }
@Exit:
pop DS { clean up and go home }
end {FastWrite};
{
From: JENS LARSSON
Subj: fast write
}
Procedure WriteXY(x, y : Word; MsgText : String; ColorAttr : Byte);
Assembler;
Asm
dec x
dec y
mov ax,y
mov cl,5
shl ax,cl
mov di,ax
mov cl,2
shl ax,cl
add di,ax
shl x,1
add di,x
mov ax,0b800h { 0b000h for mono }
mov es,ax
xor ch,ch
push ds
lds si,MsgText
lodsb
mov cl,al
mov ah,ColorAttr
jcxz @@End
@@L1:
lodsb
stosw
loop @@L1
@@End:
pop ds
End;