Delphi Image's round head

RAD Studio 10.4 test √

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procedure TMainF.Button4Click(Sender: TObject);
var
  Bmp: TBitmap;
  Rhandle: HRGN;
//  R: TRect;
begin
  Image2.Picture.LoadFromFile('head.jpg');                                    // 加载图片
//  Image2.AutoSize := true;                                                  // image大小自动调整
//  R := Image2.ClientRect;
  Bmp := TBitmap.Create;                                                      // 创建 Bmp
  // bmp.LoadFromFile('1.bmp');                                               // 加载bmp图片
  Bmp.Assign(Image2.Picture.Graphic);
//  Rhandle:=CreateRoundRectRgn(100,0,200,100,100,100);
  Rhandle := CreateRoundRectRgn(0, 0, Image2.Width, Image2.height, Image2.Width, Image2.height);        // 创建圆角矩形Rgn
  Image2.Picture.Assign(nil);
//  Image2.AutoSize := false;
//  Image2.Stretch := false;
//  Image2.height := R.Bottom - R.Top;
//  Image2.Width := R.Right - R.Left;
  Image2.Canvas.Brush.Color := clRed;
  Image2.Canvas.FillRect(Image2.ClientRect);
  SelectClipRgn(Image2.Canvas.Handle, Rhandle);                               // 选择剪辑片段
  Image2.Canvas.Draw(0, 0, Bmp);
//  DeleteObject(Rhandle);
//  Image2.Canvas.Brush.Style := bsClear;
  Image2.Picture.Bitmap.TransparentColor := clRed;
//  Image2.Picture.Bitmap.Transparent := true;
  Image2.Transparent := true;
end;

A little bit of notes recorded during study, so that you can read it later.