procedure TForm1.LoadMultiFrameFiles;
var
  B: TIEBitmap;
begin
  B := TIEBitmap.Create;
  try
    B.Read('C:\DELPHI\_test\MIOLoadFirstFrame\TestIcon1.ico');
    mimgTest.AppendImage(B);
    B.Read('C:\DELPHI\_test\MIOLoadFirstFrame\TestGIF1.gif');
    mimgTest.AppendImage(B);
    B.Read('C:\DELPHI\_test\MIOLoadFirstFrame\TestTIFMulti.tif');
    mimgTest.AppendImage(B);
  finally
    B.Free;
  end;
end;

P := TIOParams.Create;
if P.Read('TestIcon1.ico') then
begin
  LargestFrame := 0;
  LargestFrameIndex := 0;
  for i := 0 to P.ImageCount - 1 do
  begin
    WxH := P.ICO_Sizes[i].Width * P.ICO_Sizes[i].Height;
    if WxH > LargestFrame then
    begin
      LargestFrame := WxH;
      LargestFrameIndex := i;
    end;
  end;
  CodeSite.Send('LargestFrameIndex', LargestFrameIndex);
end;
P.Free;

procedure TForm1.LoadSingleFrameFromMultiFrameFiles;

  procedure LoadLargestFrameFromIco(const aIcoFile: string);
  var
    B: TIEBitmap;
    P: TIOParams;
    LargestFrame, LargestFrameIndex, WxH, FrameCount: Integer;
    i: Integer;
    ThisImage: Integer;
  begin
    B := TIEBitmap.Create;
    P := TIOParams.Create;
    try
      if P.Read(aIcoFile) then
      begin
        LargestFrameIndex := 0;
        FrameCount := P.ImageCount;
        if FrameCount > 1 then
        begin
          LargestFrame := 0;
          for i := 0 to FrameCount - 1 do
          begin
            WxH := P.ICO_Sizes[i].Width * P.ICO_Sizes[i].Height;
            if WxH > LargestFrame then
            begin
              LargestFrame := WxH;
              LargestFrameIndex := i;
            end;
          end;
        end;

        P.ImageIndex := LargestFrameIndex;
        B.Read(aIcoFile, P);
        ThisImage := mimgTest.AppendImage();
        mimgTest.SetImage(ThisImage, B);
        mimgTest.ImageTopText[ThisImage] := ExtractFileName(aIcoFile) + ' (Frame #' + IntToStr(LargestFrameIndex + 1) + '/' + IntToStr(P.ImageCount) + ')';
        mimgTest.ImageInfoText[ThisImage] := IntToStr(B.Width) + ' x ' + IntToStr(B.Height);
        FImagePaths.Add(aIcoFile);
      end;
    finally
      P.Free;
      B.Free;
    end;
  end;

  procedure LoadImage(const aImageFile: string);
  var
    P: TIOParams;
    ThisImage, FrameCount: Integer;
    ThisTopText: string;
  begin
    P := TIOParams.Create;
    try
      if P.Read(aImageFile) then
      begin
        FrameCount := P.ImageCount;
        if FrameCount = 1 then
          ThisTopText := ExtractFileName(aImageFile)
        else if FrameCount > 1 then
          ThisTopText := ExtractFileName(aImageFile) + ' (' + IntToStr(FrameCount) + ' frames)';

        ThisImage := mimgTest.AppendImage(aImageFile);
        mimgTest.ImageTopText[ThisImage] := ThisTopText;
        mimgTest.ImageInfoText[ThisImage] := IntToStr(mimgTest.ImageWidth[ThisImage]) + ' x ' + IntToStr(mimgTest.ImageHeight[ThisImage]);
        FImagePaths.Add(aImageFile);
      end;
    finally
      P.Free;
    end;
  end;

begin
  // ICO containing multiple frames:
  LoadLargestFrameFromIco('C:\DELPHI\_test\MIOLoadFirstFrame\TestIcon1.ico');

  // GIF:
  LoadImage('C:\DELPHI\_test\MIOLoadFirstFrame\TestGIF1.gif');

  // TIF:
  LoadImage('C:\DELPHI\_test\MIOLoadFirstFrame\TestTIFMulti.tif');

  // PNG:
  LoadImage('C:\DELPHI\_test\MIOLoadFirstFrame\flowers.png');

  // ICO containing only 1 frame:
  LoadLargestFrameFromIco('C:\DELPHI\_test\MIOLoadFirstFrame\Testicon2.ico');

  mimgTest.SelectedImage := 0;
  ShowFilePathInStatusBar(0);
end;