>From de5d91aa15cc98795a68c8e553eb4baadaa0e501 Mon Sep 17 00:00:00 2001
From: Carlos Garnacho <carlosg@gnome.org>
Date: Fri, 17 May 2013 15:56:28 +0200
Subject: [PATCH] pixbuf: load "@2x" variants as pixbuf gobject data

if a variant of the filename is found that has a "@2x" appended
to the file name (before the extension), such file is loaded
and added as GObject data to the pixbuf
---
 gdk-pixbuf/gdk-pixbuf-io.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/gdk-pixbuf/gdk-pixbuf-io.c b/gdk-pixbuf/gdk-pixbuf-io.c
index dac21b8..ed98cd3 100644
--- a/gdk-pixbuf/gdk-pixbuf-io.c
+++ b/gdk-pixbuf/gdk-pixbuf-io.c
@@ -1025,6 +1025,40 @@ _gdk_pixbuf_generic_image_load (GdkPixbufModule *module,
         return pixbuf;
 }

+static gboolean
+_gdk_pixbuf_file_is_scaled (const gchar *filename)
+{
+	gchar *basename, *ext;
+
+	basename = g_path_get_basename (filename);
+	ext = strrchr (basename, '.');
+
+	if (!ext)
+		ext = &basename[strlen(basename)];
+
+	if (ext > basename + 3 && strncmp (ext - 3, "@2x", 3) == 0)
+		return TRUE;
+
+	return FALSE;
+}
+
+static gchar *
+_gdk_pixbuf_compose_scaled_filename (const gchar *filename)
+{
+	gchar *ext, *first, *composed;
+
+	ext = strrchr (filename, '.');
+
+	if (!ext)
+		return NULL;
+
+	first = g_strndup (filename, ext - filename);
+	composed = g_strdup_printf ("%s@2x%s", first, ext);
+	g_free (first);
+
+	return composed;
+}
+
 /**
  * gdk_pixbuf_new_from_file:
  * @filename: Name of file to load, in the GLib file name encoding
@@ -1049,11 +1083,13 @@ gdk_pixbuf_new_from_file (const char *filename,
         guchar buffer[SNIFF_BUFFER_SIZE];
         GdkPixbufModule *image_module;
         gchar *display_name;
+	gboolean filename_is_scaled;

         g_return_val_if_fail (filename != NULL, NULL);
         g_return_val_if_fail (error == NULL || *error == NULL, NULL);

         display_name = g_filename_display_name (filename);
+	filename_is_scaled = _gdk_pixbuf_file_is_scaled (filename);

         f = g_fopen (filename, "rb");
         if (!f) {
@@ -1097,6 +1133,25 @@ gdk_pixbuf_new_from_file (const char *filename,
         pixbuf = _gdk_pixbuf_generic_image_load (image_module, f, error);
         fclose (f);

+	if (pixbuf && !filename_is_scaled) {
+		GdkPixbuf *scaled_pixbuf = NULL;
+		gchar *scaled_filename;
+
+		scaled_filename = _gdk_pixbuf_compose_scaled_filename (filename);
+
+		if (scaled_filename) {
+			scaled_pixbuf = gdk_pixbuf_new_from_file (scaled_filename, NULL);
+			g_free (scaled_filename);
+		}
+
+		if (scaled_pixbuf) {
+			g_object_set_data_full (G_OBJECT (pixbuf),
+                                                "gdk-pixbuf-2x-variant",
+                                                scaled_pixbuf,
+                                                (GDestroyNotify) g_object_unref);
+		}
+	}
+
         if (pixbuf == NULL && error != NULL && *error == NULL) {

                 /* I don't trust these crufty longjmp()'ing image libs
--
1.8.3.rc1