Add tests for hsv<>rgb conversion

2 files changed, 63 insertions, 0 deletions

diff --git a/testsuite/gtk/colorutils.c b/testsuite/gtk/colorutils.c
new file mode 100644
index 0000000000..b4d42e2bb2
--- /dev/null
+++ b/testsuite/gtk/colorutils.c
@@ -0,0 +1,62 @@
+/* Copyright (C) 2023 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <gtk/gtk.h>
+#include <gtk/gtkcolorutils.h>
+
+struct {
+  float r, g, b;
+  float h, s, v;
+} tests[] = {
+  { 0, 0, 0, 0, 0, 0 },
+  { 1, 1, 1, 0, 0, 1 },
+  { 1, 0, 0, 0, 1, 1 },
+  { 1, 1, 0, 1.0 / 6.0, 1, 1 },
+  { 0, 1, 0, 2.0 / 6.0, 1, 1 },
+  { 0, 1, 1, 3.0 / 6.0, 1, 1 },
+  { 0, 0, 1, 4.0 / 6.0, 1, 1 },
+  { 1, 0, 1, 5.0 / 6.0, 1, 1 },
+};
+
+static void
+test_roundtrips (void)
+{
+  for (unsigned int i = 0; i < G_N_ELEMENTS (tests); i++)
+    {
+      float r, g, b;
+      float h, s, v;
+
+      g_print ("color %u\n", i);
+      gtk_hsv_to_rgb (tests[i].h, tests[i].s, tests[i].v, &r, &g, &b);
+      g_assert_cmpfloat_with_epsilon (r, tests[i].r, FLT_EPSILON);
+      g_assert_cmpfloat_with_epsilon (g, tests[i].g, FLT_EPSILON);
+      g_assert_cmpfloat_with_epsilon (b, tests[i].b, FLT_EPSILON);
+      gtk_rgb_to_hsv (tests[i].r, tests[i].g, tests[i].b, &h, &s, &v);
+      g_assert_cmpfloat_with_epsilon (h, tests[i].h, FLT_EPSILON);
+      g_assert_cmpfloat_with_epsilon (s, tests[i].s, FLT_EPSILON);
+      g_assert_cmpfloat_with_epsilon (v, tests[i].v, FLT_EPSILON);
+    }
+}
+
+int
+main (int   argc,
+      char *argv[])
+{
+  gtk_test_init (&argc, &argv);
+
+  g_test_add_func ("/color/roundtrips", test_roundtrips);
+
+  return g_test_run();
+}
diff --git a/testsuite/gtk/meson.build b/testsuite/gtk/meson.build
index 7f28f213ec..0ee1403828 100644
--- a/testsuite/gtk/meson.build
+++ b/testsuite/gtk/meson.build
@@ -127,6 +127,7 @@ internal_tests = [
   { 'name': 'fnmatch' },
   { 'name': 'a11y' },
   { 'name': 'listitemmanager' },
+  { 'name': 'colorutils' },
 ]
 
 is_debug = get_option('buildtype').startswith('debug')