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{ Copyright (C) 2001 Juha Vehviläinen
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.}
unit pluginunit;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
DirectX, DXDraws;
type
TEffectProc = procedure(const Bits: Pointer;
const lPitch, Width, Height, BitCount: Integer;
const args: PChar;
const ret: PChar); cdecl;
TCopyProc = procedure(
const Bits1: Pointer;
const lPitch1, Width1, Height1, BitCount1: Integer;
const Bits2: Pointer;
const lPitch2, Width2, Height2, BitCount2: Integer;
const args: PChar;
const ret: PChar
); cdecl;
TPointerList = TList;
TLibraryList = TList;
TPlugins = class(TComponent)
private
Names: TStringList;
EffectProcs: TPointerList;
CopyProcs: TPointerList;
Libs: TLibraryList;
procedure LoadHandleFile(const SearchRec: TSearchRec;
const FullPath: String);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Load;
procedure Reload;
procedure Clear;
function IsPlugin(const s: String): Boolean;
function CallEffect(const d: TDirectDrawSurface;
const procname: String; const args: String): Boolean;
function CallCopy(const d1: TDirectDrawSurface;
const d2: TDirectDrawSurface;
const procname: String; const args: String): Boolean;
end;
implementation
uses
mainunit,
Filez;
type
THandlePtr = ^THandle;
const
EffectProcName = 'perform_effect';
CopyProcName = 'perform_copy';
{ TPlugins }
constructor TPlugins.Create(AOwner: TComponent);
begin
inherited;
Names := TStringList.Create;
EffectProcs := TPointerList.Create;
CopyProcs := TPointerList.Create;
Libs := TLibraryList.Create;
end;
destructor TPlugins.Destroy;
begin
Clear;
Names.Free;
EffectProcs.Free;
CopyProcs.Free;
Libs.Free;
inherited;
end;
procedure TPlugins.Clear;
var
hp: THandlePtr;
begin
while Names.Count>0 do Names.Delete(0);
while EffectProcs.Count>0 do EffectProcs.Delete(0);
while CopyProcs.Count>0 do CopyProcs.Delete(0);
while Libs.Count>0 do begin
hp := Libs[0];
FreeLibrary(hp^);
Libs.Delete(0);
end;
end;
procedure TPlugins.LoadHandleFile(const SearchRec: TSearchRec;
const FullPath: String);
var
h: THandle;
p: PChar;
b: array[0..255] of Char;
EffectProc: TEffectProc;
CopyProc: TCopyProc;
s: String;
i: Integer;
begin
p:=@b;
if UpperCase(ExtractFileExt(FullPath))='.DLL' then begin
h := LoadLibrary(StrPCopy(p, FullPath));
if h<>0 then begin
@EffectProc := GetProcAddress(h, EffectProcName);
@CopyProc := GetProcAddress(h, CopyProcName);
s := ExtractFileName(FullPath);
i := Pos('.DLL', UpperCase(s));
if i>0 then Delete(s, i, 255);
Names.Add(s);
EffectProcs.Add(@EffectProc);
CopyProcs.Add(@CopyProc);
Libs.Add(@h);
end;
end;
end;
procedure TPlugins.Load;
var
sd: TScanDir;
s: String;
i: Integer;
begin
sd := TScanDir.Create(Self);
sd.OnHandleFile := LoadHandleFile;
sd.Scan(ExtractFilePath(Application.ExeName)+'\Plugins');
sd.Free;
if Names.Count>0 then begin
s := '';
for i:=0 to Names.Count-1 do begin
if s<>'' then s:=s+' ';
s:=s+Names[i];
end;
main.Post('Plugins: '+s);
end;
end;
procedure TPlugins.Reload;
begin
Clear;
Load;
end;
function TPlugins.IsPlugin(const s: String): Boolean;
begin
Result := Names.IndexOf(s)<>-1;
end;
var
argsBuf: array[0..255] of Char;
function TPlugins.CallEffect(const d: TDirectDrawSurface;
const procname: String; const args: String): Boolean;
var
i: Integer;
Proc: TEffectProc;
sd: TDDSurfaceDesc;
P: PChar;
begin
Result := False;
if (Names.Count=0) or (d.Width=0) or (d.Height=0) then Exit;
i := Names.IndexOf(procname);
if (i=-1) or (i>=EffectProcs.Count) then Exit;
@Proc := EffectProcs[i];
if @Proc=nil then Exit;
P:=@argsBuf;
P[0]:=#0;
d.Lock(sd);
Proc(sd.lpSurface, sd.lPitch, d.Width, d.Height, d.BitCount,
PChar(args), P);
d.UnLock;
if P[0]<>#0 then
main.SendReturnValues(StrPas(P));
Result := True;
end;
function TPlugins.CallCopy(const d1, d2: TDirectDrawSurface;
const procname: String; const args: String): Boolean;
var
i: Integer;
Proc: TCopyProc;
sd1: TDDSurfaceDesc;
sd2: TDDSurfaceDesc;
P: PChar;
begin
Result := False;
if (Names.Count=0) or
(d1.Width=0) or (d1.Height=0) or
(d2.Width=0) or (d2.Height=0) then Exit;
i := Names.IndexOf(procname);
if (i=-1) or (i>=CopyProcs.Count) then Exit;
@Proc := CopyProcs[i];
if @Proc=nil then Exit;
P:=@argsBuf;
P[0]:=#0;
d1.Lock(sd1);
d2.Lock(sd2);
Proc(sd1.lpSurface, sd1.lPitch, d1.Width, d1.Height, d1.BitCount,
sd2.lpSurface, sd2.lPitch, d2.Width, d2.Height, d2.BitCount,
PChar(args), P);
d1.UnLock;
d2.UnLock;
if P[0]<>#0 then
main.SendReturnValues(StrPas(P));
Result := True;
end;
end.
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