Initialize Random::Range()

- For security, the random number generator would be initialized
to use rand().

Change-Id: I6930001c41001ec217bf706d84dc15b71a17d1fe
Signed-off-by: Seoyeon Kim <seoyeon2.kim@samsung.com>

diff --git a/dali/public-api/math/random.h b/dali/public-api/math/random.h
index 8067112..2e8391e 100644 (file)
--- a/dali/public-api/math/random.h
+++ b/dali/public-api/math/random.h
@@ -48,6 +48,16 @@ inline float Range(float f0, float f1)
 {
   float min = std::min(f0, f1);
   float max = std::max(f0, f1);
+
+  // Ensure we initialize only once. As it's inlined, this static variable will exist in the code-block using it, thus,
+  // will be created and then initialized again when another code-block uses this.
+  static bool initialized( false );
+  if( !initialized )
+  {
+    srand( time( NULL ) );
+    initialized = true;
+  }
+
   return min + (rand() & 0xfff) * (max-min) * (1.0f/4095.0f);
 }