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0013_SPEEDVID.PAS.pas
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Pascal/Delphi Source File
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1993-05-28
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4KB
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135 lines
Unit SpeedVid;
{ High speed Text-video routines For working With binary Files, direct }
{ screen access etc. (c)1993 Chris Lautenbach }
{ }
{ You are hereby permitted to use this routines, so long as you give me }
{ credit. If you modify them, do not distribute the modified version. }
{ }
{ Notes: This Unit will work fine in 50 line mode, or on monochrome }
{ monitors. Remember; when working in 50 line mode, always }
{ make sure you call Window(1,1,80,50) so that WindMax is }
{ updated With the correct screen co-ordinates. In addition, }
{ the ScrollScreen() routine is much faster than it's standard }
{ BIOS Int 10h counterpart. }
{ }
{ Turbo Professional users have no need For FastWrite(), }
{ VideoMode, or ScreenHeight - since these are approximations }
{ are provided For use by people who do not have the TpCrt }
{ Unit. }
{ }
{ If you need to contact me, I can be found in the NANet, City2City, }
{ and Intelec Pascal echoes - or at my support BBS, Toronto Twilight }
{ Communications (416) 733-9012. Internet: cs911212@iris.ariel.yorku.ca }
Interface
Uses
Dos, Crt;
Const
MonoMode : Boolean = False;
Type
ScreenLine = Array[1..160] of Char;
ScreenBuffer = Array[1..50] of ScreenLine;
DirectionType = (Up, Down);
Var
VideoScreen : ScreenBuffer Absolute $B800:$0000;
MonoScreen : ScreenBuffer Absolute $B000:$0000;
Function VideoMode : Byte; { Get video mode }
Function ScreenHeight : Byte; { Return height of screen in lines }
Procedure ScrollScreen(Direction : DirectionType); { Scroll screen up/down }
Procedure FastWrite(st:String; x,y,color:Byte); { Write Text to vid mem }
Procedure RestoreScreen(Var p:Pointer); { Restore saved screen }
Procedure SaveScreen(Var p:Pointer); { Save screen to a Pointer }
Implementation
Function VideoMode : Byte;
Var
Mode : Byte;
begin
Asm
MOV AH, 0Fh { Set Function to 0Fh - Get current video mode }
INT 10h { Call interrupt 10h - Video Services }
MOV Mode, AL { Move INT 10h result to Mode Variable }
end;
VideoMode := Mode;
end;
Function ScreenHeight:Byte;
begin
ScreenHeight := (Hi(WindMax) + 1);
end;
Procedure ScrollScreen(Direction : DirectionType);
begin
Case Direction of
Up :
If MonoMode then
Move(MonoScreen[2],MonoScreen[1],Sizeof(ScreenLine)*(ScreenHeight-1))
ELSE
Move(VideoScreen[2],VideoScreen[1],Sizeof(ScreenLine)*(ScreenHeight-1));
Down :
If MonoMode then
Move(VideoScreen[1],VideoScreen[2],Sizeof(ScreenLine)*(ScreenHeight-1))
ELSE
Move(VideoScreen[1],VideoScreen[2],Sizeof(ScreenLine)*(ScreenHeight-1));
end; { Case }
end;
Procedure FastWrite(st:String; x,y,color:Byte);
{ Write a String directly to the screen, x=column, y=row }
Var
idx, cdx : Byte;
begin
idx := x * 2;
cdx := 1;
Repeat
{$R-}
If MonoMode then
begin
MonoScreen[y][idx+2] := Chr(Color);
MonoScreen[y][idx+1] := St[cdx];
end
ELSE
begin
VideoScreen[y][idx+2] := Chr(Color);
VideoScreen[y][idx+1] := St[cdx];
end;
{$R+}
Inc(idx,2);
Inc(cdx,1);
Until cdx>=length(st);
end;
Procedure RestoreScreen(Var p:Pointer);
begin
If Assigned(P) then { make sure this Pointer IS allocated }
begin
If MonoMode then
Move(P^, MonoScreen, 4000)
ELSE
Move(P^, VideoScreen, ScreenHeight*SizeOf(ScreenLine));
FreeMem(P,ScreenHeight*Sizeof(ScreenLine));
end;
end;
Procedure SaveScreen(Var p:Pointer);
begin
If not Assigned(P) then { make sure Pointer isn't already allocated }
begin
GetMem(P,ScreenHeight*Sizeof(ScreenLine));
If MonoMode then
Move(MonoScreen, P^, 4000)
ELSE
Move(VideoScreen, P^, ScreenHeight*Sizeof(ScreenLine));
end;
end;
begin
end.