The TTPOLYGONHEADER structure specifies the starting position and type of a contour in a TrueType character outline.
typedef struct _TTPOLYGONHEADER { // ttph 
    DWORD   cb; 
    DWORD   dwType; 
    POINTFX pfxStart; 
} TTPOLYGONHEADER, FAR* LPTTPOLYGONHEADER; 
 
Each TTPOLYGONHEADER structure is followed by one or more TTPOLYCURVE structures.