[vf] Define VF_FaceRec and other format specific structures.

* src/vf/vfdrivr.h: Define VF_Bitmap, VF, and TFM
and other structures to hold `vf' format specific
values and define VF_FaceRec to accomodate them.

src/vf/vfdrivr.h

@@ -37,10 +37,84 @@ FT_BEGIN_HEADER
 
   } VF_BitmapRec, *VF_Bitmap;
 
+  typedef struct VF_Rec_
+  {
+    char        *vf_path;
+    UINT4       cs;
+    UINT4       ds;
+    double      design_size;
+    double      point_size;
+    double      dpi_x, dpi_y;
+    double      mag_x, mag_y;
+    /* TFM */
+    char        *tfm_path;
+    TFM         tfm;
+    /* subfotns */
+    struct s_vf_subfont  *subfonts;
+    int                  subfonts_opened;
+    int                  default_subfont;
+    /* file offset to character packets (offset in vf file) */
+   long                 offs_char_packet;
+  }VF_Rec, *VF;
+
+  typedef struct s_vf_char_packet
+  {
+    UINT4         pl;
+    UINT4         cc;
+    UINT4         tfm;
+    unsigned char *dvi;
+  }s_vf_char_packet  *VF_CHAR_PACKET;
+
+  typedef struct s_vf_char_packet_tbl
+  {
+    int                npackets;
+    VF_CHAR_PACKET     packets;
+  }s_vf_char_packet_tbl  *VF_CHAR_PACKET_TBL;
+
+  typedef struct s_vf_subfont
+  {
+    UINT4         k;
+    UINT4         s;
+    UINT4         d;
+    UINT4         a;
+    UINT4         l;
+    char          *n;
+    int           font_id;  /* font id in VFlib */
+    struct s_vf_subfont *next;
+  }s_vf_subfont  *VF_SUBFONT;
+
+  typedef struct TFM_Rec_
+  {
+    /* Font Info */
+    int             type_aux;     /* METRIC_TYPE_AUX_xxx */
+    UINT4           cs;
+    /* Metrics */
+    UINT4           ds;
+    double          design_size;
+    double          slant;
+    unsigned int    begin_char, end_char;
+    INT4            *width, *height, *depth;
+    /* Font bounding box */
+    double          font_bbx_w, font_bbx_h;
+    double          font_bbx_xoff, font_bbx_yoff;
+
+  } TFM_Rec, *TFM;
+
+  struct s_vf_dvi_stack
+  {
+    long    h, v, w, x, y, z;
+    int     f;
+    int                    font_id;
+    struct s_vf_dvi_stack  *next;
+  };
+  typedef struct s_vf_dvi_stack  *VF_DVI_STACK;
+
+#define   STACK(X)     dvi_stack->next->X
+
   typedef struct  VF_FaceRec_
   {
     FT_FaceRec        root;
-    /* TO-DO */
+    VF                vf;
   } VF_FaceRec, *VF_Face;