path: root/e-util/e-icon-factory.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/*
 *  Authors: Jeffrey Stedfast <fejj@novell.com>
 *
 *  Copyright 2004 Novell, Inc. (www.novell.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 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., 59 Temple Street #330, Boston, MA 02111-1307, USA.
 *
 */


#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>

#include <pthread.h>

#include <libgnomeui/gnome-icon-theme.h>
#include <e-util/e-icon-factory.h>

#include "art/broken-image-16.xpm"
#include "art/broken-image-24.xpm"

static int sizes[E_ICON_NUM_SIZES] = {
    16, /* menu */
    20, /* button */
    18, /* small toolbar */
    24, /* large toolbar */
    32, /* dnd */
    48, /* dialog */
};


typedef struct {
    char *name;
    GdkPixbuf *pixbuf;
} Icon;

static GdkPixbuf *broken16_pixbuf = NULL;
static GdkPixbuf *broken24_pixbuf = NULL;

static GHashTable *name_to_icon = NULL;
static GnomeIconTheme *icon_theme = NULL;
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;


/* Note: takes ownership of the pixbufs (eg. does not ref them) */
static Icon *
icon_new (const char *name, GdkPixbuf *pixbuf)
{
    Icon *icon;
    
    icon = g_malloc0 (sizeof (Icon));
    icon->name = g_strdup (name);
    icon->pixbuf = pixbuf;
    
    return icon;
}

static void
icon_free (Icon *icon)
{
    g_free (icon->name);
    if (icon->pixbuf)
        g_object_unref (icon->pixbuf);
    g_free (icon);
}

static Icon *
load_icon (const char *icon_key, const char *icon_name, int size, int scale)
{
    GdkPixbuf *pixbuf, *unscaled = NULL;
    char *filename = NULL;
    
    if (icon_name[0] == '/')
        filename = g_strdup (icon_name);
    else
        filename = gnome_icon_theme_lookup_icon (icon_theme, icon_name, size, NULL, NULL);

    if (!filename || !(unscaled = gdk_pixbuf_new_from_file (filename, NULL))) {
        if (scale) {
            struct dirent *dent;
            int width, height;
            size_t baselen;
            GString *path;
            DIR *dir;
            char *x;
            
            path = g_string_new (EVOLUTION_ICONSDIR);
            if (path->str[path->len - 1] != '/')
                g_string_append_c (path, '/');
            
            baselen = path->len;
            
            if (!(dir = opendir (path->str))) {
                g_string_free (path, TRUE);
                goto done;
            }
            
            /* scan icon directories looking for an icon with a size >= the size we need. */
            while ((dent = readdir (dir))) {
                if (!(dent->d_name[0] >= '1' && dent->d_name[0] <= '9'))
                    continue;
                
                if (((width = strtol (dent->d_name, &x, 10)) < size) || *x != 'x')
                    continue;
                
                if (((height = strtol (x + 1, &x, 10)) != width) || *x != '\0')
                    continue;
                
                /* if the icon exists in this directory, we can [use/scale] it */
                g_string_truncate (path, baselen);
                g_string_append_printf (path, "%s/%s.png", dent->d_name, icon_name);
                if ((unscaled = gdk_pixbuf_new_from_file (path->str, NULL)))
                    break;
            }
            
            g_string_free (path, TRUE);
            closedir (dir);
        } else {
            g_free (filename);
            filename = g_strdup_printf (EVOLUTION_ICONSDIR "/%dx%d/%s.png", size, size, icon_name);
            unscaled = gdk_pixbuf_new_from_file (filename, NULL);
        }
    }
    
 done:
    
    g_free (filename);
    if (unscaled != NULL) {
        pixbuf = gdk_pixbuf_scale_simple (unscaled, size, size, GDK_INTERP_BILINEAR);
        g_object_unref (unscaled);
    } else {
        pixbuf = NULL;
    }
    
    return icon_new (icon_key, pixbuf);
}


/* temporary workaround for code that has not yet been ported to the new icon_size API */
static int
pixel_size_to_icon_size (int pixel_size)
{
    int i, icon_size = -1;
    
    for (i = 0; i < E_ICON_NUM_SIZES; i++) {
        if (pixel_size == sizes[i]) {
            icon_size = i;
            break;
        }
    }
    
    return icon_size;
}

static gboolean
icon_foreach_remove (gpointer key, gpointer value, gpointer user_data)
{
    icon_free (value);

    return TRUE;
}

static void
icon_theme_changed_cb (GnomeIconTheme *object, gpointer user_data)
{
    g_hash_table_foreach_remove (name_to_icon, (GHRFunc) icon_foreach_remove, NULL);
}

/**
 * e_icon_factory_init:
 *
 * Initialises the icon factory.
 **/
void
e_icon_factory_init (void)
{
    if (name_to_icon != NULL)
        return;
    
    icon_theme = gnome_icon_theme_new ();
    name_to_icon = g_hash_table_new (g_str_hash, g_str_equal);
    g_signal_connect (G_OBJECT (icon_theme), "changed", icon_theme_changed_cb, NULL);
    
    broken16_pixbuf = gdk_pixbuf_new_from_xpm_data ((const char **) broken_image_16_xpm);
    broken24_pixbuf = gdk_pixbuf_new_from_xpm_data ((const char **) broken_image_24_xpm);
}

static void
icon_foreach_free (gpointer key, gpointer value, gpointer user_data)
{
    icon_free (value);
}

/**
 * e_icon_factory_shutdown:
 *
 * Shuts down the icon factory (cleans up all cached icons, etc).
 **/
void
e_icon_factory_shutdown (void)
{
    if (name_to_icon == NULL)
        return;
    
    g_hash_table_foreach (name_to_icon, (GHFunc) icon_foreach_free, NULL);
    g_hash_table_destroy (name_to_icon);
    g_object_unref (broken16_pixbuf);
    g_object_unref (broken24_pixbuf);
    g_object_unref (icon_theme);
    name_to_icon = NULL;
}


/**
 * e_icon_factory_get_icon_filename:
 * @icon_name: name of the icon
 * @size: MENU/SMALL_TOOLBAR/etc
 *
 * Looks up the icon to use based on name and size.
 *
 * Returns the requested icon pixbuf.
 **/
char *
e_icon_factory_get_icon_filename (const char *icon_name, int icon_size)
{
    char *filename;
    
    g_return_val_if_fail (icon_name != NULL, NULL);
    g_return_val_if_fail (strcmp (icon_name, ""), NULL);
    
    if (icon_size >= E_ICON_NUM_SIZES) {
        g_warning ("calling e_icon_factory_get_icon_filename with unknown icon_size value (%d)", icon_size);
        if ((icon_size = pixel_size_to_icon_size (icon_size)) == -1)
            return NULL;
    }
    
    pthread_mutex_lock (&lock);
    filename = gnome_icon_theme_lookup_icon (icon_theme, icon_name, sizes[icon_size], NULL, NULL);
    pthread_mutex_unlock (&lock);
    
    return filename;
}


/**
 * e_icon_factory_get_icon:
 * @icon_name: name of the icon
 * @icon_size: size of the icon (one of the E_ICON_SIZE_* enum values)
 *
 * Returns the specified icon of the requested size (may perform
 * scaling to achieve this). If @icon_name is a full path, that file
 * is used directly. Otherwise it is looked up in the user's current
 * icon theme. If the icon cannot be found in the icon theme, it falls
 * back to loading the requested icon from Evolution's icon set
 * installed from the art/ srcdir. If even that fails to find the
 * requested icon, then a "broken-image" icon is returned.
 **/
GdkPixbuf *
e_icon_factory_get_icon (const char *icon_name, int icon_size)
{
    GdkPixbuf *pixbuf;
    char *icon_key;
    Icon *icon;
    int size;
    
    if (icon_size >= E_ICON_NUM_SIZES) {
        g_warning ("calling e_icon_factory_get_icon with unknown icon_size value (%d)", icon_size);
        if ((icon_size = pixel_size_to_icon_size (icon_size)) == -1)
            return NULL;
    }
    
    size = sizes[icon_size];
    
    if (icon_name == NULL || !strcmp (icon_name, "")) {
        if (size >= 24)
            return gdk_pixbuf_scale_simple (broken24_pixbuf, size, size, GDK_INTERP_NEAREST);
        else
            return gdk_pixbuf_scale_simple (broken16_pixbuf, size, size, GDK_INTERP_NEAREST);
    }
    
    icon_key = g_alloca (strlen (icon_name) + 7);
    sprintf (icon_key, "%dx%d/%s", size, size, icon_name);
    
    pthread_mutex_lock (&lock);
    
    if (!(icon = g_hash_table_lookup (name_to_icon, icon_key))) {
        if (!(icon = load_icon (icon_key, icon_name, size, TRUE))) {
            g_warning ("Icon not found -- %s", icon_name);
            
            /* Create an empty icon so that we don't keep spitting
               out the same warning over and over, every time this
               icon is requested.  */
            
            icon = icon_new (icon_key, NULL);
            g_hash_table_insert (name_to_icon, icon->name, icon);
        } else {
            g_hash_table_insert (name_to_icon, icon->name, icon);
        }
    }
    
    if ((pixbuf = icon->pixbuf)) {
        g_object_ref (pixbuf);
    } else {
        if (size >= 24)
            pixbuf = gdk_pixbuf_scale_simple (broken24_pixbuf, size, size, GDK_INTERP_NEAREST);
        else
            pixbuf = gdk_pixbuf_scale_simple (broken16_pixbuf, size, size, GDK_INTERP_NEAREST);
    }
    
    pthread_mutex_unlock (&lock);
    
    return pixbuf;
}


/**
 * e_icon_factory_get_icon_list:
 * @icon_name: name of the icon
 *
 * Returns a list of GdkPixbufs of the requested name suitable for
 * gtk_window_set_icon_list().
 **/
GList *
e_icon_factory_get_icon_list (const char *icon_name)
{
    static int icon_list_sizes[] = { 128, 64, 48, 32, 16 };
    GList *list = NULL;
    char *icon_key;
    Icon *icon;
    int size, i;
    
    if (!icon_name || !strcmp (icon_name, ""))
        return NULL;
    
    pthread_mutex_lock (&lock);
    
    icon_key = g_alloca (strlen (icon_name) + 9);
    
    for (i = 0; i < G_N_ELEMENTS (icon_list_sizes); i++) {
        size = icon_list_sizes[i];
        sprintf (icon_key, "%dx%d/%s", size, size, icon_name);
        
        if (!(icon = g_hash_table_lookup (name_to_icon, icon_key))) {
            if ((icon = load_icon (icon_key, icon_name, size, FALSE)))
                g_hash_table_insert (name_to_icon, icon->name, icon);
        }
        
        if (icon && icon->pixbuf) {
            list = g_list_prepend (list, icon->pixbuf);
            g_object_ref (icon->pixbuf);
        }
    }
    
    pthread_mutex_unlock (&lock);
    
    return list;
}