[gtk/matthiasc/color-profile-rebased: 51/51] Add a test for color conversion

[Matthias Clasen <matthiasc src gnome org>]

commit 6cb33000093e9afb520bbde80a376f081080ef01
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 30 20:57:52 2022 -0400

    Add a test for color conversion

 testsuite/gdk/color.c     | 43 +++++++++++++++++++++++++++++++++++++++++++
 testsuite/gdk/meson.build |  1 +
 2 files changed, 44 insertions(+)
---
diff --git a/testsuite/gdk/color.c b/testsuite/gdk/color.c
new file mode 100644
index 0000000000..48b70a3ceb
--- /dev/null
+++ b/testsuite/gdk/color.c
@@ -0,0 +1,43 @@
+#include <gdk/gdk.h>
+#include <gdk/gdkcolorprivate.h>
+#include <gdk/gdkcolorspaceprivate.h>
+
+static void
+test_roundtrip_srgb (void)
+{
+  GdkColorSpace *srgb = gdk_color_space_get_srgb ();
+  GdkColorSpace *srgb_linear = gdk_color_space_get_srgb_linear ();
+  GdkColor orig;
+  GdkColor linear;
+  GdkColor back;
+  GdkRGBA rgba;
+
+  for (int i = 0; i < 1000; i++)
+    {
+      rgba.red = g_test_rand_double_range (0., 1.);
+      rgba.green = g_test_rand_double_range (0., 1.);
+      rgba.blue = g_test_rand_double_range (0., 1.);
+      rgba.alpha = g_test_rand_double_range (0., 1.);
+
+      gdk_color_init_from_rgba (&orig, &rgba);
+
+      gdk_color_convert (&linear, srgb_linear, &orig);
+      gdk_color_convert (&back, srgb, &linear);
+
+      g_assert_true (gdk_color_space_equal (gdk_color_get_color_space (&orig), gdk_color_get_color_space 
(&back)));
+      g_assert_cmpfloat_with_epsilon (gdk_color_get_alpha (&orig), gdk_color_get_alpha (&back), 0.0001);
+      g_assert_cmpfloat_with_epsilon (gdk_color_get_components (&orig)[0], gdk_color_get_components 
(&back)[0], 0.0001);
+      g_assert_cmpfloat_with_epsilon (gdk_color_get_components (&orig)[1], gdk_color_get_components 
(&back)[1], 0.0001);
+      g_assert_cmpfloat_with_epsilon (gdk_color_get_components (&orig)[2], gdk_color_get_components 
(&back)[2], 0.0001);
+    }
+}
+
+int
+main (int argc, char *argv[])
+{
+  (g_test_init) (&argc, &argv, NULL);
+
+  g_test_add_func ("/color/roundtrip-srgb", test_roundtrip_srgb);
+
+  return g_test_run ();
+}
diff --git a/testsuite/gdk/meson.build b/testsuite/gdk/meson.build
index e8bc9c88f9..59e860e43c 100644
--- a/testsuite/gdk/meson.build
+++ b/testsuite/gdk/meson.build
@@ -56,6 +56,7 @@ endforeach
 internal_tests = [
   'image',
   'texture',
+  'color'
 ]
 
 foreach t : internal_tests