[cogl] tests: Add a test for the RGB <-> HSL functions

[Damien Lespiau <dlespiau src gnome org>]

commit 32d67c2bf40641b2d1d30fa2d994013c3e6ce5bc
Author: Damien Lespiau <damien lespiau intel com>
Date:   Tue May 14 21:26:30 2013 +0100

    tests: Add a test for the RGB <-> HSL functions
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 tests/conform/Makefile.am         |    1 +
 tests/conform/test-color-hsl.c    |   45 +++++++++++++++++++++++++++++++++++++
 tests/conform/test-conform-main.c |    1 +
 3 files changed, 47 insertions(+), 0 deletions(-)
---
diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index 4bb732d..8b73c53 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -29,6 +29,7 @@ test_sources = \
        test-atlas-migration.c \
        test-blend-strings.c \
        test-depth-test.c \
+       test-color-hsl.c \
        test-color-mask.c \
        test-backface-culling.c \
        test-just-vertex-shader.c \
diff --git a/tests/conform/test-color-hsl.c b/tests/conform/test-color-hsl.c
new file mode 100644
index 0000000..8c51cd9
--- /dev/null
+++ b/tests/conform/test-color-hsl.c
@@ -0,0 +1,45 @@
+#include <math.h>
+#include <string.h>
+
+#include <cogl/cogl.h>
+
+#include "test-utils.h"
+
+#define cogl_assert_float(a, b)         \
+  do {                                  \
+    if (fabsf ((a) - (b)) >= 0.0001f)   \
+      g_assert_cmpfloat ((a), ==, (b)); \
+  } while (0)
+
+void
+test_color_hsl (void)
+{
+  CoglColor color;
+  float hue, saturation, luminance;
+
+  cogl_color_init_from_4ub(&color, 108, 198, 78, 255);
+  cogl_color_to_hsl(&color, &hue, &saturation, &luminance);
+
+  cogl_assert_float(hue, 105.f);
+  cogl_assert_float(saturation, 0.512821);
+  cogl_assert_float(luminance, 0.541176);
+
+  memset(&color, 0, sizeof (CoglColor));
+  cogl_color_init_from_hsl(&color, hue, saturation, luminance);
+
+  cogl_assert_float(color.red, 108.0f / 255.0f);
+  cogl_assert_float(color.green, 198.0f / 255.0f);
+  cogl_assert_float(color.blue, 78.0f / 255.0f);
+  cogl_assert_float(color.alpha, 1.0f);
+
+  memset(&color, 0, sizeof (CoglColor));
+  cogl_color_init_from_hsl(&color, hue, 0, luminance);
+
+  cogl_assert_float(color.red, luminance);
+  cogl_assert_float(color.green, luminance);
+  cogl_assert_float(color.blue, luminance);
+  cogl_assert_float(color.alpha, 1.0f);
+
+  if (cogl_test_verbose ())
+    g_print ("OK\n");
+}
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index 569985f..671d0b2 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -133,6 +133,7 @@ main (int argc, char **argv)
             0);
 
   ADD_TEST (test_euler_quaternion, 0, 0);
+  ADD_TEST (test_color_hsl, 0, 0);
 
   ADD_TEST (test_fence, TEST_REQUIREMENT_FENCE, 0);