[babl] add simple test for float->u8 conversion

[Simon Budig <simon src gnome org>]

commit 5bcbc7a3949443ca7a76f9a16c26db3bb9d1b922
Author: Simon Budig <simon budig de>
Date:   Tue May 1 13:35:58 2012 +0200

    add simple test for float->u8 conversion

 tests/Makefile.am  |    1 +
 tests/floatclamp.c |   70 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 0 deletions(-)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 469a819..b48aee5 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -10,6 +10,7 @@ TESTS =				\
 	sanity			\
 	babl_class_name		\
 	extract \
+	floatclamp \
 	types			\
 	palette \
 	extract \
diff --git a/tests/floatclamp.c b/tests/floatclamp.c
new file mode 100644
index 0000000..953b701
--- /dev/null
+++ b/tests/floatclamp.c
@@ -0,0 +1,70 @@
+/* babl - dynamically extendable universal pixel conversion library.
+ * Copyright (C) 2005, Ãyvind KolÃs.
+ *
+ * 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 3 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 "config.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include "babl.h"
+
+
+#define CHECK_CONV(test_name, componenttype, src_fmt, dst_fmt, src_pix, expected_pix) \
+  {       \
+  const Babl *fish;       \
+  int i;       \
+  fish = babl_fish (src_fmt, dst_fmt);       \
+  if (!fish)       \
+    {       \
+      printf ("  %s failed to make fish\n", test_name);       \
+      OK = 0;       \
+    }       \
+  for (i = 0; i < sizeof(src_pix)/sizeof(src_pix[0]); i ++)       \
+    {       \
+      int c;\
+      componenttype result[10];       \
+      babl_process (fish, src_pix[i], result, 1);       \
+      for (c = 0; c < sizeof(expected_pix[i])/sizeof(expected_pix[i][0]); c++) \
+      if (result[c] != expected_pix[i][c])       \
+        {       \
+          printf (" %s failed #%i[%i]  got %i expected %i\n", test_name, i, c, result[c], expected_pix[i][c]);       \
+          OK = 0;          \
+        }       \
+    }       \
+  }
+
+#include <assert.h>
+
+int
+main (int    argc,
+      char **argv)
+{
+  int OK = 1;
+  babl_init ();
+  {
+    float in[][4]   = {{ 0.21582, -0.55, -0.14, 1.0 }};
+    unsigned char out[][4]  = {{ 55, 0, 0, 255 }};
+
+    CHECK_CONV("float -> u8", unsigned char,
+        babl_format("R'G'B'A float"),
+        babl_format("R'G'B'A u8"),
+        in, out);
+  }
+
+  babl_exit ();
+  return !OK;
+}