- guint (*top_ypixel)(const GSheetRow *geo, gint row, const GtkSheet *);
- gint (*pixel_to_row)(const GSheetRow *geo, guint pixel, const GtkSheet *);
+ guint (*top_ypixel)(const GSheetRow *geo, gint row, gpointer);
+ gint (*pixel_to_row)(const GSheetRow *geo, guint pixel, gpointer);