[babl] tools: add babl-verify start of an development aid when improving fast paths

[Øyvind Kolås <ok src gnome org>]

commit bf688453e09e879c23f73bdc53bd7ca442bc9236
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Nov 16 20:40:58 2016 +0100

    tools: add babl-verify start of an development aid when improving fast paths
    
    This tool take the names of source/target formats - and prints error/cost for
    all direct conversions matching arguments.

 tools/babl-verify.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/tools/babl-verify.c b/tools/babl-verify.c
new file mode 100644
index 0000000..15654e2
--- /dev/null
+++ b/tools/babl-verify.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "babl/babl.h"
+
+int main (int argc, char **argv)
+{
+  if (argc != 3)
+  {
+    fprintf (stderr, "need two args, from and to babl-formats\n");
+    return -1;
+  }
+  setenv ("BABL_DEBUG_CONVERSIONS", "1", 0);
+  babl_init ();
+  babl_fish (babl_format(argv[1]), babl_format (argv[2]));
+  babl_exit ();
+
+  return 0;
+}