(svn r13910) -Document: string drawing related functions and types (Alberth)

src/gfx_func.h

@@ -151,6 +151,11 @@ extern FontSize _cur_fontsize;
 
 byte GetCharacterWidth(FontSize size, uint32 key);
 
+/**
+ * Get height of a character for a given font size.
+ * @param size Font size to get height of
+ * @return     Height of characters in the given font (pixels)
+ */
 static inline byte GetCharacterHeight(FontSize size)
 {
 	switch (size) {