hid_draw.h

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enum mask_mode
{
  HID_MASK_OFF    = 0, 
  HID_MASK_BEFORE = 1, 
  HID_MASK_CLEAR  = 2, 
  HID_MASK_AFTER  = 3, 
};


struct hid_draw_st
{
  hidGC (*make_gc) (void); 
  void (*destroy_gc) (hidGC gc);
  void (*use_mask) (enum mask_mode mode);

  void (*set_color) (hidGC gc, const char *name);
  void (*set_line_cap) (hidGC gc, EndCapStyle style);
  void (*set_line_width) (hidGC gc, Coord width);
  void (*set_draw_xor) (hidGC gc, int xor_);

  void (*set_draw_faded) (hidGC gc, int faded);
  /* The usual drawing functions.  "draw" means to use segments of the
     given width, whereas "fill" means to fill to a zero-width
     outline.  */
  void (*draw_line)    (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2);
  void (*draw_arc)     (hidGC gc, Coord cx, Coord cy, Coord xradius, Coord yradius, Angle start_angle, Angle delta_angle);
  void (*draw_rect)    (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2);
  void (*fill_circle)  (hidGC gc, Coord cx, Coord cy, Coord radius);
  void (*fill_polygon) (hidGC gc, int n_coords, Coord *x, Coord *y);
  void (*fill_rect)    (hidGC gc, Coord x1, Coord y1, Coord x2, Coord y2);

  /* draw the grid in the specified region */
  void (*draw_grid)    (BoxType * box);
  
  /* The following APIs render using PCB data-structures, not immediate parameters */

  void (*draw_pcb_line) (hidGC gc, LineType *line);
  void (*draw_pcb_arc) (hidGC gc, ArcType *arc);
  void (*draw_pcb_text) (hidGC gc, TextType *, Coord);
  void (*draw_pcb_polygon) (hidGC gc, PolygonType *poly, const BoxType *clip_box);

  void (*fill_pcb_polygon) (hidGC gc, PolygonType *poly, const BoxType *clip_box);
  void (*thindraw_pcb_polygon) (hidGC gc, PolygonType *poly, const BoxType *clip_box);
  void (*fill_pcb_pad) (hidGC gc, PadType *pad, bool clip, bool mask);
  void (*thindraw_pcb_pad) (hidGC gc, PadType *pad, bool clip, bool mask);
  void (*fill_pcb_pv) (hidGC fg_gc, hidGC bg_gc, PinType *pv, bool drawHole, bool mask);
  void (*thindraw_pcb_pv) (hidGC fg_gc, hidGC bg_gc, PinType *pv, bool drawHole, bool mask);

};