_i_n_M_e_t_r_i_c Specifies the metric to measure, either GGGGLLLLCCCC____BBBBAAAASSSSEEEELLLLIIIINNNNEEEE or
GGGGLLLLCCCC____BBBBOOOOUUUUNNNNDDDDSSSS.
_o_u_t_V_e_c Specifies a vector in which to store value of _i_n_M_e_t_r_i_c for the
specified character.
DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
ggggllllccccGGGGeeeettttCCCChhhhaaaarrrrMMMMeeeettttrrrriiiicccc is identical to ggggllllccccRRRReeeennnnddddeeeerrrrCCCChhhhaaaarrrr but instead of rendering
the character that _i_n_C_o_d_e is mapped to, ggggllllccccGGGGeeeettttCCCChhhhaaaarrrrMMMMeeeettttrrrriiiicccc only measures
the baseline or bounds (depending on _i_n_M_e_t_r_i_c) of the character.
ggggllllccccGGGGeeeettttCCCChhhhaaaarrrrMMMMeeeettttrrrriiiicccc stores the value of the baseline (or bounds) in _o_u_t_V_e_c.
If _i_n_M_e_t_r_i_c is GGGGLLLLCCCC____BBBBOOOOUUUUNNNNDDDDSSSS, a vector of eight values is returned in
_o_u_t_V_e_c. The vector starts in the lower left corner and continues in a
counterclockwise direction.
EEEERRRRRRRROOOORRRRSSSS
GGGGLLLLCCCC____SSSSTTTTAAAATTTTEEEE____EEEERRRRRRRROOOORRRR is generated if the issuing thread has no current GLC