unit Unit1;

interface

uses
  SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
  Forms, Dialogs;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
    procedure FormPaint(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  Bitmap: TBitmap;

implementation

{$R *.DFM}

procedure TForm1.FormCreate(Sender: TObject);
begin
  Bitmap := TBitmap.Create;
  Bitmap.LoadFromFile('C:\WINDOWS\cars.BMP');
end;

procedure TForm1.FormPaint(Sender: TObject);
var
  X, Y, W, H: LongInt;
begin
  with Bitmap do
  begin
    W := Width;
    H := Height;
  end;
  Y := 0;
  while Y < Height do
  begin
    X := 0;
    while X < Width do
    begin
      Canvas.Draw(X, Y, Bitmap);
      Inc(X, W);
    end;
    Inc(Y, H);
  end;
end;

end.