libgimp*: keep 10 reserved spots for future virtual functions in every derivable class.

Hopefully this should be enough to add new features in the future
without breaking ABI, at least until GIMP 4!

libgimp/gimpchannel.h

@@ -41,6 +41,7 @@ struct _GimpChannelClass
   GimpDrawableClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -49,6 +50,7 @@ struct _GimpChannelClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };
 
 

libgimp/gimpdrawable.h

@@ -42,6 +42,7 @@ struct _GimpDrawableClass
   GimpItemClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);

libgimp/gimpfileprocedure.h

@@ -37,6 +37,7 @@ struct _GimpFileProcedureClass
   GimpProcedureClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);

libgimp/gimpitem.h

@@ -40,6 +40,7 @@ struct _GimpItemClass
   GObjectClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -48,6 +49,7 @@ struct _GimpItemClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };
 
 

libgimp/gimplayer.h

@@ -44,6 +44,7 @@ struct _GimpLayerClass
   GimpLayer * (* copy) (GimpLayer *layer);
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);

libgimp/gimploadprocedure.h

@@ -72,6 +72,7 @@ struct _GimpLoadProcedureClass
   GimpFileProcedureClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);

libgimp/gimpplugin.h

@@ -173,6 +173,7 @@ struct _GimpPlugInClass
 
   /* Padding for future expansion */
   /*< private >*/
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -181,6 +182,7 @@ struct _GimpPlugInClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimp/gimpprocedure.h

@@ -105,6 +105,7 @@ struct _GimpProcedureClass
 
   /* Padding for future expansion */
   /*< private >*/
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -113,6 +114,7 @@ struct _GimpProcedureClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };
 
 

libgimp/gimpprocedureconfig.h

@@ -39,6 +39,7 @@ struct _GimpProcedureConfigClass
   GObjectClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -47,6 +48,7 @@ struct _GimpProcedureConfigClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimp/gimpproceduredialog.h

@@ -49,6 +49,7 @@ struct _GimpProcedureDialogClass
                                    GList               *properties);
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -57,6 +58,7 @@ struct _GimpProcedureDialogClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };
 
 

libgimp/gimpprogress.h

@@ -94,14 +94,6 @@ typedef struct _GimpProgressVtable GimpProgressVtable;
  * @set_value:  sets a new percentage on the progress.
  * @pulse:      makes the progress pulse.
  * @get_window_handle: returns the handle of the window where the progress is displayed.
- * @_gimp_reserved1: reserved pointer for future expansion.
- * @_gimp_reserved2: reserved pointer for future expansion.
- * @_gimp_reserved3: reserved pointer for future expansion.
- * @_gimp_reserved4: reserved pointer for future expansion.
- * @_gimp_reserved5: reserved pointer for future expansion.
- * @_gimp_reserved6: reserved pointer for future expansion.
- * @_gimp_reserved7: reserved pointer for future expansion.
- * @_gimp_reserved8: reserved pointer for future expansion.
  **/
 struct _GimpProgressVtable
 {
@@ -113,6 +105,7 @@ struct _GimpProgressVtable
   GimpProgressVtableGetWindowFunc get_window_handle;
 
   /* Padding for future expansion. Must be initialized with NULL! */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -121,6 +114,7 @@ struct _GimpProgressVtable
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimp/gimpresource.h

@@ -37,6 +37,7 @@ struct _GimpResourceClass
   GObjectClass parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -45,6 +46,7 @@ struct _GimpResourceClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };
 
 gint32         gimp_resource_get_id      (GimpResource *resource);

libgimpmodule/gimpmodule.h

@@ -161,6 +161,7 @@ struct _GimpModuleClass
   void (* modified) (GimpModule *module);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -169,6 +170,7 @@ struct _GimpModuleClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpbutton.h

@@ -42,6 +42,7 @@ struct _GimpButtonClass
                              GdkModifierType  modifier_state);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -50,6 +51,7 @@ struct _GimpButtonClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpcolorbutton.h

@@ -51,6 +51,7 @@ struct _GimpColorButtonClass
   GType (* get_action_type) (GimpColorButton *button);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -59,6 +60,7 @@ struct _GimpColorButtonClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpcolordisplay.h

@@ -53,6 +53,7 @@ struct _GimpColorDisplayClass
   void        (* changed)        (GimpColorDisplay *display);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -61,6 +62,7 @@ struct _GimpColorDisplayClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpcolorselector.h

@@ -99,6 +99,7 @@ struct _GimpColorSelectorClass
                                   gboolean                  enabled);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -107,6 +108,7 @@ struct _GimpColorSelectorClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpcontroller.h

@@ -140,6 +140,7 @@ struct _GimpControllerClass
                                      const GimpControllerEvent *event);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -148,6 +149,7 @@ struct _GimpControllerClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpdialog.h

@@ -39,6 +39,7 @@ struct _GimpDialogClass
   GtkDialogClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -47,6 +48,7 @@ struct _GimpDialogClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpenumcombobox.h

@@ -38,6 +38,7 @@ struct _GimpEnumComboBoxClass
   GimpIntComboBoxClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -46,6 +47,7 @@ struct _GimpEnumComboBoxClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpframe.h

@@ -39,6 +39,7 @@ struct _GimpFrameClass
   GtkFrameClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -47,6 +48,7 @@ struct _GimpFrameClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpintcombobox.h

@@ -38,6 +38,7 @@ struct _GimpIntComboBoxClass
   GtkComboBoxClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -46,6 +47,7 @@ struct _GimpIntComboBoxClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpintstore.h

@@ -61,6 +61,7 @@ struct _GimpIntStoreClass
   GtkListStoreClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -69,6 +70,7 @@ struct _GimpIntStoreClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimplabeled.h

@@ -63,6 +63,7 @@ struct _GimpLabeledClass
 
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -71,6 +72,7 @@ struct _GimpLabeledClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 GtkWidget     * gimp_labeled_get_label (GimpLabeled *labeled);

libgimpwidgets/gimplabelspin.h

@@ -41,6 +41,7 @@ struct _GimpLabelSpinClass
   void            (* value_changed)    (GimpLabelSpin *spin);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -49,6 +50,7 @@ struct _GimpLabelSpinClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 GtkWidget  * gimp_label_spin_new             (const gchar   *text,

libgimpwidgets/gimppickbutton.h

@@ -37,6 +37,7 @@ struct _GimpPickButtonClass
                          const GeglColor *color);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -45,6 +46,7 @@ struct _GimpPickButtonClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimppreview.h

@@ -64,6 +64,7 @@ struct _GimpPreviewClass
   void   (* invalidated) (GimpPreview     *preview);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -72,6 +73,7 @@ struct _GimpPreviewClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpscaleentry.h

@@ -43,6 +43,7 @@ struct _GimpScaleEntryClass
   GtkWidget     * (* new_range_widget) (GtkAdjustment  *adjustment);
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -51,6 +52,7 @@ struct _GimpScaleEntryClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 GtkWidget     * gimp_scale_entry_new             (const gchar *text,

libgimpwidgets/gimpscrolledpreview.h

@@ -41,6 +41,7 @@ struct _GimpScrolledPreviewClass
   GimpPreviewClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -49,6 +50,7 @@ struct _GimpScrolledPreviewClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpspinbutton.h

@@ -40,10 +40,16 @@ struct _GimpSpinButtonClass
   GtkSpinButtonClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
   void (* _gimp_reserved4) (void);
+  void (* _gimp_reserved5) (void);
+  void (* _gimp_reserved6) (void);
+  void (* _gimp_reserved7) (void);
+  void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpstringcombobox.h

@@ -46,6 +46,7 @@ struct _GimpStringComboBoxClass
   GtkComboBoxClass  parent_class;
 
   /* Padding for future expansion */
+  void (* _gimp_reserved0) (void);
   void (* _gimp_reserved1) (void);
   void (* _gimp_reserved2) (void);
   void (* _gimp_reserved3) (void);
@@ -54,6 +55,7 @@ struct _GimpStringComboBoxClass
   void (* _gimp_reserved6) (void);
   void (* _gimp_reserved7) (void);
   void (* _gimp_reserved8) (void);
+  void (* _gimp_reserved9) (void);
 };
 
 

libgimpwidgets/gimpunitstore.h

@@ -52,6 +52,7 @@ struct _GimpUnitStoreClass
   GObjectClass  parent_class;
 
   /* Padding for future expansion */
+  void (*_gimp_reserved0) (void);
   void (*_gimp_reserved1) (void);
   void (*_gimp_reserved2) (void);
   void (*_gimp_reserved3) (void);
@@ -60,6 +61,7 @@ struct _GimpUnitStoreClass
   void (*_gimp_reserved6) (void);
   void (*_gimp_reserved7) (void);
   void (*_gimp_reserved8) (void);
+  void (*_gimp_reserved9) (void);
 };