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This chunk defines a path (polygon) and supplies a string to render
along the edge of the path.

    struct TPTHstruct {
        ULONG   ID;
        ULONG   Size;
        UBYTE   Justification;      /* see defines, below */
        UBYTE   WhichFont;          /* Which font to use */
        IEEE    CharW, CharH;       /* W/H of an individual char    */
        USHORT  NumChars;           /* Number of chars in the string */
        USHORT  NumPoints;          /* Number of points in the path */
        char    TextChars[NumChars];/* PAD TO EVEN #! */
        IEEE    Path[2*NumPoints];  /* The path on which the text lies */

WhichFont contains the ID of the font used to render the text.
Justification controls how the text is justified on the line.
Justification can be one of the following values:

    #define J_LEFT          0x00    /* Left justified */
    #define J_RIGHT         0x01    /* Right justified */
    #define J_CENTER        0x02    /* Center text */
    #define J_SPREAD        0x03    /* Spread text across path */

CharW and CharH are the average width and height of the font
characters and are akin to X and Y font sizes, respectively.  A
negative FontH implies that the font is upsidedown.  Note that CharW
must not be negative.  NumChars is the number of characters in the
TextChars[] string, the string containing the text to be rendered.
NumPoints is the number of points in the Path[] array.  Path[] is the
path along which the text is rendered.  The path itself is not
rendered.  The points of Path[] are in the same format as the points
of a DR2D polygon.

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