问在画布上绘制PNG格式的TPicture，而不使用GDI+

EN

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls,
  ComCtrls, ExtCtrls,

  GDIPObj, GDIPAPI;
...

procedure DrawPictureToBitmap(Bitmap: TBitmap; X, Y: Integer; Picture: TPicture);

  function PictureToGPBitmap(Picture: TPicture): TGPBitmap;
  var
    MemStream: TMemoryStream;
  begin
    MemStream := TMemoryStream.Create;
    try
      Picture.Graphic.SaveToStream(MemStream);

      MemStream.Position := 0;

      Result := TGPBitmap.Create(TStreamAdapter.Create(MemStream));
    finally
      FreeAndNil(MemStream);
    end;
  end;

var
  GDICanvas: TGPGraphics;
  GPImage: TGPImage;
begin
  GDICanvas := TGPGraphics.Create(Bitmap.Canvas.Handle);
  try
    GPImage := PictureToGPBitmap(Picture);
    try
      GDICanvas.DrawImage(GPImage, X, Y);

      // Did the draw succeed?
      if GDICanvas.GetLastStatus <> Ok then
      begin
        // No, try a BitBlt!
        BitBlt(Bitmap.Canvas.Handle, X, Y, Bitmap.Height, Bitmap.Width, Picture.Bitmap.Canvas.Handle, 0, 0, SRCCOPY);
      end;
    finally
      FreeAndNil(GPImage);
    end;
  finally
    FreeAndNil(GDICanvas);
  end;
end;

procedure DrawPictureToBitmap(Bitmap: TBitmap; X, Y: Integer; Picture: TPicture);
var
  PNG: TPngImage;
  MemStream: TMemoryStream;
begin
  PNG := TPngImage.Create;
  try
    MemStream := TMemoryStream.Create;
    try
      Picture.Graphic.SaveToStream(MemStream);

      MemStream.Position := 0;

      PNG.LoadFromStream(MemStream);
    finally
      FreeAndNil(MemStream);
    end;

    PNG.Draw(Bitmap.Canvas, Rect(X, Y, X + Picture.Width, Y + Picture.Height));
  finally
    FreeAndNil(PNG);
  end;
end;