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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure setcursor(const bm1,bm2:TBitmap;x,y:integer);
  var h:      THandle;
      Iinfo:  TIconInfo;
begin
  try
    Iinfo.fIcon:=true;
    Iinfo.xHotspot:=x;
    Iinfo.yHotspot:=y;
    Iinfo.hbmMask:=bm2.Handle;
    Iinfo.hbmColor:=bm1.Handle;
    Screen.Cursors[1]:=CreateIconIndirect(Iinfo);
    Form1.Cursor:=1;
    Screen.Cursor:=1;
  finally 
    bm2.free;
    bm1.free;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var bmp,mask:TBitmap;
begin
bmp:=TBitmap.Create;
mask:=TBitmap.Create;
bmp.SetSize(50,50);
mask.SetSize(50,50);

bmp.Canvas.MoveTo(0,0);
bmp.Canvas.LineTo(49,49);

mask.Monochrome:=true;
mask.Canvas.Pen.Color:=clblack;
mask.Canvas.Brush.Color:=clblack;
//mask.Canvas.Pen.Color:=clwhite;
//mask.Canvas.Brush.Color:=clwhite;
mask.Canvas.Rectangle(0,0,50,50);

mask.Canvas.Pen.Color:=clwhite;
//mask.Canvas.Pen.Color:=clblack;
mask.Canvas.MoveTo(0,0);
mask.Canvas.LineTo(49,49);

setcursor(bmp,mask,0,0);

end;

end.