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CD ROM Paradise Collection 4
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CD ROM Paradise Collection 4 1995 Nov.iso
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0018_Three FAST write Routines.pas
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Pascal/Delphi Source File
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1993-06-08
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3KB
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73 lines
{ THREE DIFFERENT WAYS TO WRITE TO SCREEN WITH ROW AND COLUMN }
{ TWO ARE VERY FAST AND ALLOW COLOR }
procedure QWrite( Column, Line , Color : byte; S : STRING );
var
VMode : BYTE ABSOLUTE $0040 : $0049; { Video mode: Mono=7, Color=0-3 }
NumCol : WORD ABSOLUTE $0040 : $004A; { Number of CRT columns (1-based) }
VSeg : WORD;
OfsPos : integer; { offset position of the character in video RAM }
vPos : integer;
sLen : Byte ABSOLUTE S;
Begin
If VMode in [0,2,7] THEN VSeg := $B000 ELSE VSeg := $B800;
OfsPos := (((pred(Line) * NumCol) + pred(Column)) * 2);
FOR vPos := 0 to pred(sLen) do
MemW[VSeg : (OfsPos + (vPos * 2))] :=
(Color shl 8) + byte(S[succ(vPos)])
End;
procedure fastwrite(x, y, f, b: byte; s : STRING);
{ Does a direct video write -- extremely fast.
X, Y = screen location of first byte;
S = string to display;
F = foreground color;
B = background color. }
type videolocation = record { the layout of a two-byte video location }
videodata: char; { character displayed }
videoattribute: byte; { attributes }
end;
var cnter: byte;
videosegment: word; { the location of video memory }
monosystem: boolean; { mono vs. color }
vidptr: ^videolocation; { pointer to video locations }
begin
{ Find the memory location where the string will be displayed at, according to
the monitor type and screen location. Then associate the pointer VIDPTR with
that memory location: VIDPTR is a pointer to type VIDEOLOCATION. Insert a
character and attribute; now go to the next character and video location. }
monosystem := (lastmode in [0,2,7]);
if monosystem then videosegment := $b000 else videosegment := $b800;
vidptr := ptr(videosegment, 2*(80*(y - 1) + (x - 1)));
for cnter := 1 to length(s) do begin
vidptr^.videoattribute := (b shl 4) + f; { high nibble=bg; lo nibble=fg }
vidptr^.videodata := s[cnter]; { put character at location }
inc(vidptr); { go to next video location }
end;
end;
Procedure Print(x,y : Byte; S : String);
BEGIN
ASM
MOV DH, Y { DH = Row (Y) }
MOV DL, X { DL = Column (X) }
DEC DH { Adjust For Zero-based Bios routines }
DEC DL { Turbo Crt.GotoXY is 1-based }
MOV BH,0 { Display page 0 }
MOV AH,2 { Call For SET CURSOR POSITION }
INT 10h
END;
WRITE(S);
END;