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Fl_Image_Cache.h

/*
 * $Id: Fl_Image_Cache.h,v 1.4 2003/03/15 16:09:55 laza2000 Exp $
 *
 * Extended Fast Light Toolkit (EFLTK)
 * Copyright (C) 2002-2003 by EDE-Team
 * WWW: http://www.sourceforge.net/projects/ede
 *
 * Fast Light Toolkit (FLTK)
 * Copyright (C) 1998-2003 by Bill Spitzak and others.
 * WWW: http://www.fltk.org
 *
 * This library is distributed under the GNU LIBRARY GENERAL PUBLIC LICENSE
 * version 2. See COPYING for details.
 *
 * Author : Mikko Lahteenmaki
 * Email  : mikko@fltk.net
 *
 * Please report all bugs and problems to "efltk-bugs@fltk.net"
 *
 */

#ifndef _FL_IMAGE_CACHE_H_
#define _FL_IMAGE_CACHE_H_

#include "Fl_Image.h"
#include "Fl_Ptr_List.h"

class Fl_Image_Cache
{
    typedef struct {
        Fl_Image *image;
        char *identify;
    } CachedImage;

    Fl_Ptr_List images;
    uint size_;
    bool autodelete_;

public:
    // Size of cache as a param, 0 is unlimited
    Fl_Image_Cache(int size=0) { size_ = size; autodelete_ = false; }
    ~Fl_Image_Cache() { clear(); }

    // Clears cache, deletes images if auto delete is set true
    void clear() {
        for(uint n=0; n<images.size(); n++) {
            CachedImage *i = (CachedImage *)images[n];
            if(i->identify) delete []i->identify;
            if(i->image && autodelete_) delete i->image;
            delete i;
        }
        images.clear();
    }
    Fl_Image *get(const char *identify) {
        for(uint n=0; n<images.size(); n++) {
            CachedImage *i = (CachedImage *)images[n];
            if(!strcmp(identify, i->identify)) return i->image;
        }
        return 0;
    }

    // Removes image from cache, returns removed image
    Fl_Image *remove(const char *identify) {
        for(uint n=0; n<images.size(); n++) {
            CachedImage *i = (CachedImage *)images[n];
            if(!strcmp(identify, i->identify)) {
                images.remove(i);
                if(i->identify) delete []i->identify;
                Fl_Image *tmp = i->image;
                delete i;
                return tmp;
            }
        }
        return 0;
    }

    // Returns replaced image, if any
    Fl_Image *add(Fl_Image *i, const char *identify) {
        if(!i) return 0;

        CachedImage *c;
        // Remove previously cached with same identify
        for(uint n=0; n<images.size(); n++) {
            c = (CachedImage *)images[n];
            if(!strcmp(identify, c->identify)) {
                if(c->identify) delete []c->identify;
                c->identify = strdup(identify);
                Fl_Image *tmp = c->image;
                c->image = i;
                return tmp;
            }
        }

        c = new CachedImage;
        c->image = i;
        c->identify = strdup(identify);

        images.append(c);
        check_size();

        return 0;
    }

    // Check cache size and removes images first, if needed
    void check_size() {
        if(size_>0 && images.count() > size_) {
            CachedImage *i = (CachedImage *)images[0];
            images.remove(i);
            if(i->identify) delete []i->identify;
            if(i->image && autodelete_) delete i->image;
            delete i;
        }
    }

    bool autodelete() { return autodelete_; }
    void autodelete(bool val) { autodelete_ = val; }
    int size() { return size_; }
    void size(int s) { size_ = s; check_size(); }
    int cached() { return images.count(); }
};

#endif

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