dimgjpegloader.h

Go to the documentation of this file.

/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2005-06-14
 * Description : A JPEG IO file for DImg framework
 *
 * Copyright (C) 2005      by Renchi Raju <renchi dot raju at gmail dot com>, Gilles Caulier
 * Copyright (C) 2005-2022 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_DIMG_JPEG_LOADER_H
#define DIGIKAM_DIMG_JPEG_LOADER_H
 
// C++ includes
 
#include <cstdio>
#include <cstdlib>
 
// C ANSI includes
 
extern "C"
{
#include <setjmp.h>
 
// to avoid warnings under win32
#undef HAVE_STDLIB_H
#undef HAVE_STDDEF_H
 
#include <jpeglib.h>
}
 
// Local includes
 
#include "dimg.h"
#include "dimgloader.h"
 
using namespace Digikam;
 
namespace DigikamJPEGDImgPlugin
{
 
class DImgJPEGLoader : public DImgLoader
{
 
public:
 
    explicit DImgJPEGLoader(DImg* const image);
    ~DImgJPEGLoader()                                                      override;
 
    bool load(const QString& filePath, DImgLoaderObserver* const observer) override;
    bool save(const QString& filePath, DImgLoaderObserver* const observer) override;
 
    bool hasAlpha()                                                  const override;
    bool sixteenBit()                                                const override;
    bool isReadOnly()                                                const override;
 
private:
 
    // To manage Errors/Warnings handling provide by libjpeg
 
    struct dimg_jpeg_error_mgr : public jpeg_error_mgr
    {
        jmp_buf setjmp_buffer;
    };
 
    static void dimg_jpeg_error_exit(j_common_ptr cinfo);
    static void dimg_jpeg_emit_message(j_common_ptr cinfo, int msg_level);
    static void dimg_jpeg_output_message(j_common_ptr cinfo);
};
 
} // namespace DigikamJPEGDImgPlugin
 
#endif // DIGIKAM_DIMG_JPEG_LOADER_H