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.