[babl] tests: add a test for conversions cairo-RGB24 <-> R'G'B' u8

[Massimo Valentini <mvalentini src gnome org>]

commit 070aa66c84087c28dce12f92ed653f97ae93f8cd
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Sat Jul 14 17:07:37 2012 +0200

    tests: add a test for conversions cairo-RGB24 <-> R'G'B' u8

 tests/.gitignore    |    1 +
 tests/Makefile.am   |    1 +
 tests/cairo-RGB24.c |   95 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+), 0 deletions(-)
---
diff --git a/tests/.gitignore b/tests/.gitignore
index 36bb71d..6d6ea04 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -6,6 +6,7 @@
 /babl_class_name*
 /babl_fish_path_dhtml*
 /babl_fish_path_fitness*
+/cairo-RGB24*
 /concurrency-stress-test*
 /conversions*
 /extract*
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 3d74227..a13270d 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -18,6 +18,7 @@ TESTS =				\
 	nop \
 	n_components		\
 	models			\
+	cairo-RGB24		\
 	$(CONCURRENCY_STRESS_TEST)
 
 TESTS_ENVIRONMENT = BABL_PATH=$(top_builddir)/extensions/.libs
diff --git a/tests/cairo-RGB24.c b/tests/cairo-RGB24.c
new file mode 100644
index 0000000..a50eca1
--- /dev/null
+++ b/tests/cairo-RGB24.c
@@ -0,0 +1,95 @@
+/* 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 <stdio.h>
+#include <stdlib.h>
+#include "babl.h"
+
+static int
+cairo24_rgb_cairo24 (void)
+{
+  int OK = 1, i;
+
+  for (i = 0; i < 256; ++i)
+    {
+      /* Valgrind complains if 'tmp' is not initialized
+       * and the brittle RTTI (BABL_IS_BABL) produces a
+       * crash if it contains { 0x00, 0xb1, 0xba, 0x00 }
+       */
+      unsigned char tmp[4] = { 0, /*0xb1, 0xba, 0x00*/ };
+      /* Valgrind complains if 'output' is not initialized
+       * and the brittle RTTI (BABL_IS_BABL) produces a
+       * crash if it contains 0xbab100
+       */
+      unsigned int output = ~ 0xbab100;
+      unsigned int input = (i * 256 + i) * 256 + i;
+
+      babl_process (babl_fish ("cairo-RGB24", "R'G'B' u8"), &input, &tmp[0], 1);
+      babl_process (babl_fish ("R'G'B' u8", "cairo-RGB24"), &tmp[0], &output, 1);
+
+      if ((input & 0x00ffffff) != (output & 0x00ffffff))
+        {
+          fprintf (stderr , "%08x -> %d %d %d -> %08x\n",
+                   input, tmp[0], tmp[1], tmp[2], output);
+          OK = 0;
+        }
+    }
+
+  return OK;
+}
+
+static int
+rgb_cairo24_rgb (void)
+{
+  int OK = 1, i;
+
+  for (i = 0; i < 256; ++i)
+    {
+      /* As above */
+      unsigned int tmp = ~ 0xbab100;
+      unsigned char output[4] = { 0x00, /*0xb1, 0xba, 0x00*/ };
+      unsigned char input[4] = { i, i, i, 17 };
+
+      babl_process (babl_fish ("R'G'B' u8", "cairo-RGB24"), input, &tmp, 1);
+      babl_process (babl_fish ("cairo-RGB24", "R'G'B' u8"), &tmp, output, 1);
+
+      if (input[0] != output[0] || input[1] != output[1] || input[2] != output[2])
+        {
+          fprintf (stderr , "%d %d %d -> %08x -> %d %d %d\n",
+                   input[0], input[1], input[2], tmp, output[0], output[1], output[2]);
+          OK = 0;
+        }
+    }
+
+  return OK;
+}
+
+int
+main (void)
+{
+  int OK;
+
+  babl_init ();
+
+  OK = cairo24_rgb_cairo24 () && rgb_cairo24_rgb ();
+
+  babl_exit ();
+
+  return !OK;
+}