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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtDlgs, ExtCtrls, Menus;

type
  TForm1 = class(TForm)
    Image1: TImage;
    OpenPictureDialog1: TOpenPictureDialog;
    SavePictureDialog1: TSavePictureDialog;
    MainMenu1: TMainMenu;
    mmFile: TMenuItem;
    mmFileOpen: TMenuItem;
    N1: TMenuItem;
    mmFileSave: TMenuItem;
    mmFileSaveAs: TMenuItem;
    mmAnsicht: TMenuItem;
    mmZoomIn: TMenuItem;
    mmZoomOut: TMenuItem;
    procedure mmFileOpenClick(Sender: TObject);
    procedure mmFileSaveClick(Sender: TObject);
    procedure mmFileSaveAsClick(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.mmFileOpenClick(Sender: TObject);
begin
  if OpenPictureDialog1.Execute(Handle) then
  begin
    Image1.Picture.LoadFromFile(OpenPictureDialog1.FileName);
    SavePictureDialog1.FileName := OpenPictureDialog1.FileName;
    mmFileSave.Enabled   := True;
    mmFileSaveAs.Enabled := True;
  end;
end;

procedure TForm1.mmFileSaveAsClick(Sender: TObject);
begin
  if SavePictureDialog1.Execute(Handle) then
  begin
    Image1.Picture.SaveToFile(SavePictureDialog1.FileName);
  end;
end;

procedure TForm1.mmFileSaveClick(Sender: TObject);
begin
  Image1.Picture.SaveToFile(SavePictureDialog1.FileName);
end;

end.                    

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uses
  jpeg;                    

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if Assigned(PicA) then PicA.DrawTo(imgdisplayA.Picture.Bitmap);                    

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type
  TTGAImage = class(TGraphic)
    procedure Draw(ACanvas: TCanvas; const Rect: TRect); override;
    procedure LoadFromStream(Stream: TStream); override;
    procedure SaveToStream(Stream: TStream); override;
    {usw.}
  end;

implementation

  {...}

initialization
  TPicture.RegisterFileFormat('TGA', 'TGA graphics', TTGAImage);  // Do not localize

finalization
  TPicture.UnregisterGraphicClass(TTGAImage);

end.                    

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procedure TTGAImageClass.DrawTo(Bmp:TBitmap);
var
p : TRGBAPointer;
begin
Bmp.Width := FHeader.ImgWidth;
Bmp.Height := FHeader.ImgHeight;
Bmp.PixelFormat := pf32bit;
p := Bmp.ScanLine[FHeader.ImgHeight-1];
CopyMemory(p,FData,FHeader.ImgWidth*FHeader.ImgHeight*Channels);
end;                    

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Bmp.Width := FHeader.ImgWidth;
Bmp.Height := FHeader.ImgHeight;