[gdk-pixbuf] Add tests for scaling of various image types

[Matthias Clasen <matthiasc src gnome org>]

commit c17ba241aba5b91135a50bfdaaea345cf0b9508a
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 18 22:23:28 2013 -0500

    Add tests for scaling of various image types
    
    Notably, this test catches the regression fixed
    in the previous commit.

 tests/Makefile.am    |    1 +
 tests/pixbuf-scale.c |   76 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 77 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3d109c5..1139b79 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -34,6 +34,7 @@ test_programs =                       \
        pixbuf-icc                      \
        pixbuf-stream                   \
        pixbuf-resource                 \
+       pixbuf-scale                    \
        $(NULL)
 
 dist_test_data =                       \
diff --git a/tests/pixbuf-scale.c b/tests/pixbuf-scale.c
new file mode 100644
index 0000000..1445b3e
--- /dev/null
+++ b/tests/pixbuf-scale.c
@@ -0,0 +1,76 @@
+/* -*- Mode: C; c-basic-offset: 2; -*- */
+/* GdkPixbuf library - test loaders
+ *
+ * Copyright (C) 2013 Red Hat, Inc.
+ *
+ * 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 Place, Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Author: Matthias Clasen
+ */
+
+#include "config.h"
+#include "gdk-pixbuf/gdk-pixbuf.h"
+
+static void
+test_scale (gconstpointer data)
+{
+  const gchar *filename = data;
+  const gchar *path;
+  GError *error = NULL;
+  GdkPixbuf *ref;
+  GdkPixbuf *pixbuf;
+  gint width, height;
+
+  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_new_from_file_at_scale (path, 2 * width, 3 * height, FALSE, &error);
+  g_assert_no_error (error);
+
+  g_assert_cmpint (gdk_pixbuf_get_width (pixbuf), ==, 2 * width);
+  g_assert_cmpint (gdk_pixbuf_get_height (pixbuf), ==, 3 * height);
+  
+  g_object_unref (pixbuf);
+
+  pixbuf = gdk_pixbuf_new_from_file_at_scale (path, 4 * width, 2 * height, TRUE, &error);
+  g_assert_no_error (error);
+
+  g_assert_cmpint (gdk_pixbuf_get_width (pixbuf), ==, 2 * width);
+  g_assert_cmpint (gdk_pixbuf_get_height (pixbuf), ==, 2 * height);
+  
+  g_object_unref (pixbuf);
+
+  g_object_unref (ref);
+}
+
+int
+main (int argc, char **argv)
+{
+  g_test_init (&argc, &argv, NULL);
+
+  g_test_add_data_func ("/pixbuf/scale/png", "test-images/valid_png_test", test_scale);
+  g_test_add_data_func ("/pixbuf/scale/bmp", "test-images/valid_bmp_test", test_scale);
+  g_test_add_data_func ("/pixbuf/scale/gif", "test-images/valid_gif_test", test_scale);
+  g_test_add_data_func ("/pixbuf/scale/jpeg", "test-images/valid_jpeg_test", test_scale);
+  g_test_add_data_func ("/pixbuf/scale/ras", "test-images/valid_ras_test", test_scale);
+  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);
+
+  return g_test_run ();
+}