/*
 *  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 "../rtengine/rtengine.h"
#include "threadutils.h"
#include <gtkmm.h>
#include <list>

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

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

class PreviewHandler : public rtengine::PreviewImageListener {

    friend int setImageUI   (void* data);
    friend int delImageUI   (void* data);
    friend int imageReadyUI (void* data);

    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 ();    
        virtual ~PreviewHandler ();

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

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

        // 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
