previewtask.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2006-12-26
 * Description : Multithreaded loader for previews
 *
 * Copyright (C) 2006-2011 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 * Copyright (C) 2006-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * This program is free software; you can redistribute it
 * and/or modify it under the terms of the GNU General
 * Public License as published by the Free Software Foundation;
 * either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * ============================================================ */
 
#ifndef DIGIKAM_PREVIEW_TASK_H
#define DIGIKAM_PREVIEW_TASK_H
 
// Qt includes
 
#include <QImage>
 
// Local includes
 
#include "loadsavetask.h"
#include "metaengine_previews.h"
 
namespace Digikam
{
 
class PreviewLoadingTask : public SharedLoadingTask
{
public:
 
    explicit PreviewLoadingTask(LoadSaveThread* const thread,
                                const LoadingDescription& description);
    ~PreviewLoadingTask() override;
 
    void execute()        override;
 
private:
 
    bool loadExiv2Preview(MetaEnginePreviews& previews, int sizeLimit = -1);
    bool loadLibRawPreview(int sizeLimit = -1);
    bool loadHalfSizeRaw();
    bool needToScale();
    bool loadImagePreview(int sizeLimit = -1);
    void convertQImageToDImg();
 
private:
 
    QImage m_qimage;
    bool   m_fromRawEmbeddedPreview;
 
private:
 
    // Disable
    PreviewLoadingTask(const PreviewLoadingTask&)            = delete;
    PreviewLoadingTask& operator=(const PreviewLoadingTask&) = delete;
};
 
} // namespace Digikam
 
#endif // DIGIKAM_PREVIEW_TASK_H