[gdk-pixbuf] Add a test for scaling down a huge image

[Matthias Clasen <matthiasc src gnome org>]

commit e4eaa11b0ac28960ab0696085d49104166c9a5b2
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Aug 24 14:26:24 2015 -0400

    Add a test for scaling down a huge image
    
    This currently segfaults in the png loader.

 tests/large.png      |  Bin 0 -> 2507420 bytes
 tests/pixbuf-scale.c |   30 ++++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)
---
diff --git a/tests/large.png b/tests/large.png
new file mode 100644
index 0000000..310bd62
Binary files /dev/null and b/tests/large.png differ
diff --git a/tests/pixbuf-scale.c b/tests/pixbuf-scale.c
index eeddfe6..c6f55b5 100644
--- a/tests/pixbuf-scale.c
+++ b/tests/pixbuf-scale.c
@@ -65,6 +65,35 @@ test_scale (gconstpointer data)
   g_object_unref (ref);
 }
 
+static void
+test_scale_down (gconstpointer data)
+{
+  const gchar *filename = data;
+  const gchar *path;
+  GError *error = NULL;
+  GdkPixbuf *ref;
+  GdkPixbuf *pixbuf;
+  gint width, height;
+
+  if (!format_supported (filename))
+    {
+      g_test_skip ("format not supported");
+      return;
+    }
+
+  path = g_test_get_filename (G_TEST_DIST, filename, NULL);
+  ref = gdk_pixbuf_new_from_file (path, &error);
+  g_assert_no_error (error);
+
+  width = gdk_pixbuf_get_width (ref);
+  height = gdk_pixbuf_get_height (ref);
+
+  pixbuf = gdk_pixbuf_scale_simple (ref, width / 10, height / 10, GDK_INTERP_BILINEAR);
+  g_assert (pixbuf != NULL);
+
+  g_object_unref (ref);
+}
+
 int
 main (int argc, char **argv)
 {
@@ -78,6 +107,7 @@ main (int argc, char **argv)
   g_test_add_data_func ("/pixbuf/scale/tga", "test-images/valid_tga_test", test_scale);
   g_test_add_data_func ("/pixbuf/scale/xpm", "test-images/valid_xpm_test", test_scale);
   g_test_add_data_func ("/pixbuf/scale/xbm", "test-images/valid.xbm", test_scale);
+  g_test_add_data_func ("/pixbuf/scale/large", "large.png", test_scale_down);
 
   return g_test_run ();
 }