Memoryleak with TBgraBitmap an ZXING in Lazarus - delphi

Question

I have a memory problem with TBgraBitmap in combination with the barcode detection ZXING in Lazarus. Does anyone see my problem?
After resize the image for a better detection, the memory grows and grows.
It works, but it crashes because of running as a 32-bit assembly. I work with ca. 10 source tifs in color scanned mode and 300 dpi.
unit frmmain;
{$IFDEF FPC}
//{$mode objfpc}{$H+}
{$mode delphi}{$H+}
{$ENDIF}
interface
uses
{$ifdef FPC}
LResources,
{$endif}
{$ifdef MSWindows}Windows, {$endif}
Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ComCtrls,
StdCtrls, ExtCtrls, Clipbrd, Buttons, fpimage,
Generics.Collections,
ZXing.ReadResult,
ZXing.BarCodeFormat,
ZXing.DecodeHintType,
ZXing.ResultPoint,
ZXing.Scanmanager,
UConvert, dateutils,
{zum Vergrößern }BgraBitmap, BGRABitmapTypes,
{für enum namen}typinfo;
type
{ TMainForm }
TMainForm = class(TForm)
Button1: TButton;
Button2: TButton;
Image1: TImage;
Label1: TLabel;
Label2: TLabel;
ListBoxFiles: TListBox;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure FormCreate(Sender: TObject);
procedure ListBoxFilesClick(Sender: TObject);
private
function GetAppPath(): string;
function GetFiles(LPfad: string): TStringList;
function Resample(Src: string; percent: integer): TBitmap;
public
end;
var
MainForm: TMainForm;
maxZoom: integer;
implementation
{$R *.lfm}
{ TMainForm }
procedure TMainForm.Button1Click(Sender: TObject);
var
scanner: TScanmanager;
readResult: TReadResult;
barcodeInt, zoom: integer;
// pic: TPicture;
bmp: TBitmap;
begin
Button1.Enabled := False;
ListBoxFiles.Enabled := False;
application.ProcessMessages;
zoom := 100;
while zoom <= 180 do
begin
//erkennen
bmp := Resample(Label2.Caption, zoom);
scanner := TScanmanager.Create(TBarcodeFormat.QR_CODE, nil); //TBarcodeFormat.auto
readResult := scanner.Scan(bmp);
//free mem
FreeAndNil(bmp);
//free mem
FreeAndNil(scanner);
application.ProcessMessages;
if readResult <> nil then
begin
barcodeInt := Ord(readResult.BarcodeFormat);
{barcodeTypeStr := TypInfo.GetEnumName(
System.TypeInfo(ZXing.BarCodeFormat.TBarcodeFormat), barcodeInt);
}
Text := 'Zoom: ' + IntToStr(zoom) + ' : ' + readResult.Text +
' Code: ' + IntToStr(barcodeInt);
if zoom > maxZoom then
maxZoom := zoom;
break;
end
else
Text := 'Zoom: ' + IntToStr(zoom) + '-';
zoom := zoom + 10;
application.ProcessMessages;
//free mem
FreeAndNil(readResult);
end;
//show result
Label1.Caption := 'Max. Zoom: ' + IntToStr(maxzoom);
Button1.Enabled := True;
ListBoxFiles.Enabled := True;
end;
function TMainForm.Resample(Src: string; percent: integer): TBitmap;
var
Width, Height: integer;
reSampleBitmap: TBgraBitmap;
pic: TPicture;
begin
//if percent = 100 then
//begin
// Result := TBitmap.Create;
// Result.Assign(Src);
// exit;
//end;
// reSampleBitmap := TBgraBitmap.Create();
// reSampleBitmap.LoadFromFile(Src);
pic := TPicture.Create;
pic.LoadFromFile(src);
reSampleBitmap := TBgraBitmap.Create(pic.Bitmap);
Width := round(reSampleBitmap.Height * percent / 100);
Height := round(reSampleBitmap.Height * percent / 100);
reSampleBitmap.ResampleFilter := rfBestQuality;
reSampleBitmap := reSampleBitmap.Resample(Width, Height);// as TBGRABitmap;
Result := TBitmap.Create;
Result.Assign(reSampleBitmap);
FreeAndNil(reSampleBitmap);
FreeAndNil(pic);
end;
procedure TMainForm.Button2Click(Sender: TObject);
var
i: integer;
begin
maxZoom := 0;
for i := 0 to ListBoxFiles.Count - 1 do
begin
ListBoxFiles.ClearSelection;
ListBoxFiles.Selected[i] := True;
ListBoxFilesClick(self);
end;
end;
procedure TMainForm.ListBoxFilesClick(Sender: TObject);
var
fullFilename: string;
obj: TObject;
bmp: TPicture;
begin
obj := ListBoxFiles.Items.Objects[ListBoxFiles.ItemIndex];
if obj <> nil then
begin
fullfilename := string(obj);
Label2.Caption := fullfilename;
bmp := TPicture.Create;
bmp.LoadFromFile(fullfilename);
Image1.Picture.Assign(bmp);
FreeAndNil(bmp);
obj := nil;
Button1Click(self);
end;
end;
procedure TMainForm.FormCreate(Sender: TObject);
var
sourceFolder, fileName: string;
files: TStringList;
i: integer;
begin
ListBoxFiles.Clear;
Label2.Caption := '';
maxZoom := 100;
sourceFolder := GetAppPath() + 'Tifs\';
//D:\EigeneDateien\Lazarus\ZXing\Tifs
files := Getfiles(sourcefolder);
for i := 0 to files.Count - 1 do
begin
fileName := ExtractFileName(files[i]);
ListBoxFiles.AddItem(fileName, TObject(files[i]));
end;
end;
function TMainForm.GetFiles(LPfad: string): TStringList;
var
LSearchRec: TSearchRec;
begin
Result := TStringList.Create;
if FindFirst(LPfad + '*.*', faAnyFile, LSearchRec) = 0 then
begin
repeat
if LSearchRec.Attr and faDirectory = 0 then
begin
Result.Add(LPfad + LSearchRec.Name);
end;
until FindNext(LSearchRec) <> 0;
FindClose(LSearchRec);
end;
end;
function TMainForm.GetAppPath(): string;
var
appDir: string;
begin
appDir := ExpandFileName(ExtractFileDir(Application.ExeName));
appDir := IncludeTrailingPathDelimiter(appDir);
Result := appDir;
end;
end.