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unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    procedure FormCreate(Sender: TObject);    procedure FormPaint(Sender: TObject);    procedure Button1Click(Sender: TObject);    procedure FormDblClick(Sender: TObject);    procedure FormDestroy(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}var  bit: TBitmap;procedure TForm1.FormCreate(Sender: TObject);begin  bit := TBitmap.Create;  bit.LoadFromFile('c:\temp\test.bmp');end;procedure TForm1.FormPaint(Sender: TObject);begin  Canvas.Draw(0, 0, bit);end;procedure TForm1.Button1Click(Sender: TObject);var  rgn1,rgn2: HRGN;  x,y,w,h: Integer;begin  w := bit.Width;  h := bit.Height;  rgn1 := CreateRectRgn(0, 0, w, h);  for x := 0 to w - 1 do    for y := 0 to h - 1 do      if bit.Canvas.Pixels[x,y] = clBlack then      begin        rgn2 := CreateRectRgn(x, y, x+1, y+1);        CombineRgn(rgn1, rgn1, rgn2, RGN_XOR);        DeleteObject(rgn2);      end;  SetWindowRgn(Handle, rgn1, True);  Self.BorderStyle := bsNone;  Self.Width := w;  Self.Height := h;end;procedure TForm1.FormDblClick(Sender: TObject);begin  Close;end;procedure TForm1.FormDestroy(Sender: TObject);begin  bit.Free;end;end.