/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  RawTherapee 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _PREVIEWHANDLER_
#define _PREVIEWHANDLER_

#include <list>

#include <gtkmm.h>

#include "guiutils.h"
#include "threadutils.h"

#include "../rtengine/rtengine.h"

class PreviewListener {
public:
    virtual ~PreviewListener() = default;
    virtual void previewImageChanged() = 0;
};

class PreviewHandler;

struct PreviewHandlerIdleHelper {
    PreviewHandler *phandler;
    bool destroyed;
    int pending;
};

class PreviewHandler: public rtengine::PreviewImageListener {
private:
    friend int setImageUI(void *data);
    friend int delImageUI(void *data);
    friend int imageReadyUI(void *data);

    IdleRegister idle_register;

protected:
    rtengine::IImage8 *image;
    rtengine::procparams::CropParams cropParams;
    double previewScale;
    PreviewHandlerIdleHelper *pih;
    std::list<PreviewListener *> listeners;
    MyMutex previewImgMutex;
    Glib::RefPtr<Gdk::Pixbuf> previewImg;

public:
    PreviewHandler();
    ~PreviewHandler() override;

    void addPreviewImageListener(PreviewListener *l) { listeners.push_back(l); }

    // previewimagelistener
    void setImage(rtengine::IImage8 *img, double scale,
                  const rtengine::procparams::CropParams &cp) override;
    void delImage(rtengine::IImage8 *img) override;
    void imageReady(const rtengine::procparams::CropParams &cp) override;

    // this function is called when a new preview image arrives from rtengine
    void previewImageChanged();

    // with this function it is possible to ask for a rough approximation of a
    // (possibly zoomed) crop of the image
    Glib::RefPtr<Gdk::Pixbuf> getRoughImage(int x, int y, int w, int h,
                                            double zoom);
    Glib::RefPtr<Gdk::Pixbuf> getRoughImage(int desiredW, int desiredH,
                                            double &zoom);
    rtengine::procparams::CropParams getCropParams() { return cropParams; }
};

#endif
