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/*
    DeaDBeeF - ultimate music player for GNU/Linux systems with X11
    Copyright (C) 2009-2010 Alexey Yakovenko <waker@users.sourceforge.net>

    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
    of the License, 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.
    
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
#include <gtk/gtk.h>
#include <sys/time.h>
#include <string.h>
#include <stdlib.h>
#include "coverart.h"
#include "../artwork/artwork.h"

extern DB_artwork_plugin_t *coverart_plugin;

#define MAX_ID 256
#define CACHE_SIZE 20

typedef struct {
    struct timeval tm;
    char *fname;
    int width;
    GdkPixbuf *pixbuf;
} cached_pixbuf_t;

static cached_pixbuf_t cache[CACHE_SIZE];

void
cover_avail_callback (const char *artist, const char *album) {
}

static GdkPixbuf *
get_pixbuf (const char *fname, int width) {
    int requested_width = width;
    // find in cache
    int cache_min = 0;
    for (int i = 0; i < CACHE_SIZE; i++) {
        if (!cache[i].pixbuf) {
            cache_min = i;
        }
        if (cache[i].pixbuf) {
            if (!strcmp (fname, cache[i].fname) && cache[i].width == width) {
                gettimeofday (&cache[i].tm, NULL);
                return cache[i].pixbuf;
            }
        }
        if (cache[cache_min].pixbuf && cache[i].pixbuf) {
            if (cache[cache_min].tm.tv_sec < cache[i].tm.tv_sec) {
                cache_min = i;
            }
        }
    }

    printf ("loading image %s\n", fname);
    GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file (fname, NULL);
    if (!pixbuf) {
        return NULL;
    }

    int w, h;
    w = gdk_pixbuf_get_width (pixbuf);
    h = gdk_pixbuf_get_height (pixbuf);
    if (w != width) {
        int height;
        if (w > h) {
            height = width * h / w;
        }
        else if (h > w) {
            height = width;
            width = height * w / h;
        }
        else {
            height = width;
        }
        GdkPixbuf *scaled = gdk_pixbuf_scale_simple (pixbuf, width, height, GDK_INTERP_BILINEAR);
        g_object_unref (pixbuf);
        pixbuf = scaled;
    }
    if (cache[cache_min].pixbuf) {
        g_object_unref (cache[cache_min].pixbuf);
    }
    if (cache[cache_min].fname) {
        free (cache[cache_min].fname);
    }
    cache[cache_min].pixbuf = pixbuf;
    cache[cache_min].fname = strdup (fname);
    gettimeofday (&cache[cache_min].tm, NULL);
    cache[cache_min].width = requested_width;
    return pixbuf;
}

GdkPixbuf *
get_cover_art (DB_playItem_t *it, int width) {
    if (!coverart_plugin) {
        return NULL;
    }
    const char *fname = coverart_plugin->get_album_art (it, cover_avail_callback);
    if (fname) {
//        printf ("loading %s\n", fname);
        return get_pixbuf (fname, width);
    }
    return NULL;
}