Math Lib: add iroundf function for: (int)floorf(a + 0.5f)

source/blender/blenlib/BLI_math_base.h

@@ -231,6 +231,7 @@ MINLINE int is_power_of_2_i(int n);
 MINLINE int power_of_2_max_i(int n);
 MINLINE int power_of_2_min_i(int n);
 
+MINLINE int iroundf(float a);
 MINLINE int divide_round_i(int a, int b);
 MINLINE int mod_i(int i, int n);
 

source/blender/blenlib/intern/math_base_inline.c

@@ -151,6 +151,11 @@ MINLINE int power_of_2_min_i(int n)
 	return n;
 }
 
+MINLINE int iroundf(float a)
+{
+	return (int)floorf(a + 0.5f);
+}
+
 /* integer division that rounds 0.5 up, particularly useful for color blending
  * with integers, to avoid gradual darkening when rounding down */
 MINLINE int divide_round_i(int a, int b)