The ABCFLOAT structure contains the A, B, and C widths of a font character.
typedef struct _ABCFLOAT { // abcf
FLOAT abcfA;
FLOAT abcfB;
FLOAT abcfC;
} ABCFLOAT;
The A, B, and C widths are measured along the base line of the font.
The character increment (total width) of a character is the sum of the “A,” “B,” and “C” spaces. Either the “A” or the “C” space can be negative to indicate underhangs or overhangs.
See: