[clutter] test-cogl-blend-strings: Allow single-bit rendering error

[Emmanuele Bassi <ebassi src gnome org>]

commit 7beb222d3f27740cb3c1a8a75859aee74712a9cd
Author: Adam Jackson <ajax redhat com>
Date:   Mon May 2 12:13:57 2011 -0400

    test-cogl-blend-strings: Allow single-bit rendering error
    
    Signed-off-by: Adam Jackson <ajax redhat com>
    
    http://bugzilla.clutter-project.org/show_bug.cgi?id=2640

 tests/conform/test-cogl-blend-strings.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/tests/conform/test-cogl-blend-strings.c b/tests/conform/test-cogl-blend-strings.c
index 0c6428a..6bec85b 100644
--- a/tests/conform/test-cogl-blend-strings.c
+++ b/tests/conform/test-cogl-blend-strings.c
@@ -2,6 +2,7 @@
 #include <clutter/clutter.h>
 #include <cogl/cogl.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "test-conform-common.h"
 
@@ -39,10 +40,9 @@ check_pixel (GLubyte *pixel, guint32 color)
   if (g_test_verbose ())
     g_print ("  expected = %x, %x, %x, %x\n",
              r, g, b, a);
-  /* FIXME - allow for hardware in-precision */
-  g_assert_cmpint (pixel[RED], ==, r);
-  g_assert_cmpint (pixel[GREEN], ==, g);
-  g_assert_cmpint (pixel[BLUE], ==, b);
+  g_assert_cmpint (abs(pixel[RED] - r), <=, 1);
+  g_assert_cmpint (abs(pixel[GREEN] - g), <=, 1);
+  g_assert_cmpint (abs(pixel[BLUE] - b), <=, 1);
 
   /* FIXME
    * We ignore the alpha, since we don't know if our render target is