[gnome-photos] Absorb eog-pixbuf-util.[ch] from Eye of GNOME into photos-utils.[ch]

[Debarshi Ray <debarshir src gnome org>]

commit 1c0cfdd4843e1bc2996d18302330f238e3929808
Author: Debarshi Ray <debarshir gnome org>
Date:   Sat Sep 8 19:21:10 2012 +0200

    Absorb eog-pixbuf-util.[ch] from Eye of GNOME into photos-utils.[ch]
    
    eog-pixbuf-util.[ch] neither had copyright nor license notices.

 src/photos-utils.c |  141 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/photos-utils.h |    8 +++
 2 files changed, 149 insertions(+), 0 deletions(-)
---
diff --git a/src/photos-utils.c b/src/photos-utils.c
index 9c5701f..863a4c0 100644
--- a/src/photos-utils.c
+++ b/src/photos-utils.c
@@ -319,6 +319,147 @@ photos_utils_get_icon_size (void)
 }
 
 
+gchar *
+photos_utils_get_pixbuf_common_suffix (GdkPixbufFormat *format)
+{
+  gchar **extensions;
+  gchar *result = NULL;
+  gint i;
+
+  if (format == NULL)
+    return NULL;
+
+  extensions = gdk_pixbuf_format_get_extensions (format);
+  if (extensions[0] == NULL)
+    return NULL;
+
+  /* try to find 3-char suffix first, use the last occurence */
+  for (i = 0; extensions [i] != NULL; i++)
+    {
+      if (strlen (extensions[i]) <= 3)
+        {
+          g_free (result);
+          result = g_ascii_strdown (extensions[i], -1);
+        }
+    }
+
+  /* otherwise take the first one */
+  if (result == NULL)
+    result = g_ascii_strdown (extensions[0], -1);
+
+  g_strfreev (extensions);
+
+  return result;
+}
+
+
+static gchar *
+photos_utils_get_pixbuf_suffix_from_basename (const gchar *basename)
+{
+  gchar *suffix;
+  gchar *suffix_start;
+  guint len;
+
+  /* FIXME: does this work for all locales? */
+  suffix_start = g_utf8_strrchr (basename, -1, '.');
+
+  if (suffix_start == NULL)
+    return NULL;
+
+  len = strlen (suffix_start) - 1;
+  suffix = g_strndup (suffix_start+1, len);
+
+  return suffix;
+}
+
+
+GdkPixbufFormat *
+photos_utils_get_pixbuf_format (GFile *file)
+{
+  GdkPixbufFormat *format;
+  gchar *basename;
+  gchar *path;
+  gchar *suffix;
+
+  g_return_val_if_fail (file != NULL, NULL);
+
+  path = g_file_get_path (file);
+  basename = g_path_get_basename (path);
+  suffix = photos_utils_get_pixbuf_suffix_from_basename (basename);
+
+  format = photos_utils_get_pixbuf_format_by_suffix (suffix);
+
+  g_free (path);
+  g_free (basename);
+  g_free (suffix);
+
+  return format;
+}
+
+
+GdkPixbufFormat*
+photos_utils_get_pixbuf_format_by_suffix (const gchar *suffix)
+{
+  GSList *list;
+  GSList *it;
+  GdkPixbufFormat *result = NULL;
+
+  g_return_val_if_fail (suffix != NULL, NULL);
+
+  list = gdk_pixbuf_get_formats ();
+
+  for (it = list; (it != NULL) && (result == NULL); it = it->next)
+    {
+      GdkPixbufFormat *format;
+      gchar **extensions;
+      gint i;
+
+      format = (GdkPixbufFormat*) it->data;
+
+      extensions = gdk_pixbuf_format_get_extensions (format);
+      for (i = 0; extensions[i] != NULL; i++)
+        {
+          /* g_print ("check extension: %s against %s\n", extensions[i], suffix); */
+          if (g_ascii_strcasecmp (suffix, extensions[i]) == 0)
+            {
+              result = format;
+              break;
+          }
+        }
+
+      g_strfreev (extensions);
+    }
+
+  g_slist_free (list);
+
+  return result;
+}
+
+
+GSList *
+photos_utils_get_pixbuf_savable_formats (void)
+{
+  GSList *list;
+  GSList *write_list = NULL;
+  GSList *it;
+
+  list = gdk_pixbuf_get_formats ();
+
+  for (it = list; it != NULL; it = it->next)
+    {
+      GdkPixbufFormat *format;
+
+      format = (GdkPixbufFormat*) it->data;
+      if (gdk_pixbuf_format_is_writable (format))
+        write_list = g_slist_prepend (write_list, format);
+    }
+
+  g_slist_free (list);
+  write_list = g_slist_reverse (write_list);
+
+  return write_list;
+}
+
 GtkBorder *
 photos_utils_get_thumbnail_frame_border (void)
 {
diff --git a/src/photos-utils.h b/src/photos-utils.h
index 2a10d93..8e86deb 100644
--- a/src/photos-utils.h
+++ b/src/photos-utils.h
@@ -48,6 +48,14 @@ gchar           *photos_utils_filename_strip_extension    (const gchar *filename
 
 gint             photos_utils_get_icon_size               (void);
 
+char*            photos_utils_get_pixbuf_common_suffix    (GdkPixbufFormat *format);
+
+GdkPixbufFormat* photos_utils_get_pixbuf_format           (GFile *file);
+
+GdkPixbufFormat* photos_utils_get_pixbuf_format_by_suffix (const char *suffix);
+
+GSList*          photos_utils_get_pixbuf_savable_formats  (void);
+
 GtkBorder       *photos_utils_get_thumbnail_frame_border  (void);
 
 GList           *photos_utils_get_urns_from_paths         (GList *paths, GtkTreeModel *model);