Exposed the font character size and SDLTest_DrawCharacter() to make it easier to do custom debug text layout

include/SDL_test_font.h

@@ -38,6 +38,20 @@ extern "C" {
 
 /* Function prototypes */
 
+#define FONT_CHARACTER_SIZE  8
+
+/**
+ *  \brief Draw a string in the currently set font.
+ *
+ *  \param renderer The renderer to draw on.
+ *  \param x The X coordinate of the upper left corner of the character.
+ *  \param y The Y coordinate of the upper left corner of the character.
+ *  \param c The character to draw.
+ *
+ *  \returns Returns 0 on success, -1 on failure.
+ */
+int SDLTest_DrawCharacter( SDL_Renderer *renderer, int x, int y, char c );
+
 /**
  *  \brief Draw a string in the currently set font.
  *