Code Cleanup: make cpack into a function.

source/blender/editors/include/BIF_gl.h

@@ -53,7 +53,7 @@
  * color, while not being endian-sensitive. On little-endians, this
  * is the same as doing a 'naive' indexing, on big-endian, it is not!
  * */
-#define cpack(x)    glColor3ub( ((x) & 0xFF), (((x) >> 8) & 0xFF), (((x) >> 16) & 0xFF) )
+void cpack(unsigned int x);
 
 #define glMultMatrixf(x)  glMultMatrixf( (float *)(x))
 #define glLoadMatrixf(x)  glLoadMatrixf( (float *)(x))

source/blender/editors/screen/glutil.c

@@ -1157,3 +1157,10 @@ void glaDrawImBuf_glsl_ctx(const bContext *C, ImBuf *ibuf, float x, float y, int
 
 	glaDrawImBuf_glsl(ibuf, x, y, zoomfilter, view_settings, display_settings);
 }
+
+void cpack(unsigned int x)
+{
+	glColor3ub( ( (x)        & 0xFF),
+	            (((x) >>  8) & 0xFF),
+	            (((x) >> 16) & 0xFF) );
+}