BLI_math: add min/max utils for chars.

source/blender/blenlib/BLI_math_base.h

@@ -151,6 +151,9 @@ MINLINE int max_iiii(int a, int b, int c, int d);
 MINLINE size_t min_zz(size_t a, size_t b);
 MINLINE size_t max_zz(size_t a, size_t b);
 
+MINLINE char min_cc(char a, char b);
+MINLINE char max_cc(char a, char b);
+
 MINLINE int clamp_i(int value, int min, int max);
 MINLINE float clamp_f(float value, float min, float max);
 MINLINE size_t clamp_z(size_t value, size_t min, size_t max);

source/blender/blenlib/intern/math_base_inline.c

@@ -524,6 +524,15 @@ MINLINE size_t max_zz(size_t a, size_t b)
   return (b < a) ? a : b;
 }
 
+MINLINE char min_cc(char a, char b)
+{
+  return (a < b) ? a : b;
+}
+MINLINE char max_cc(char a, char b)
+{
+  return (b < a) ? a : b;
+}
+
 MINLINE int clamp_i(int value, int min, int max)
 {
   return min_ii(max_ii(value, min), max);