[gimp] Add get_parent() API for items, layers, channels and vectors

[Michael Natterer <mitch src gnome org>]

commit e0224cdbfbacec49c72c4ae22c6e661790c6b68b
Author: Michael Natterer <mitch gimp org>
Date:   Sun Feb 7 12:03:07 2010 +0100

    Add get_parent() API for items, layers, channels and vectors
    
    this is pretty pointless from an abstraction point of view, but using
    these functions will make the code a lot more readable by getting rid
    of tons of ugly casts to and from GimpViewable whenever getting an
    item's parent.

 app/core/gimpchannel.c    |    8 ++++++++
 app/core/gimpchannel.h    |    2 ++
 app/core/gimpitem.c       |    8 ++++++++
 app/core/gimpitem.h       |    2 ++
 app/core/gimplayer.c      |    8 ++++++++
 app/core/gimplayer.h      |    2 ++
 app/vectors/gimpvectors.c |    8 ++++++++
 app/vectors/gimpvectors.h |    3 ++-
 8 files changed, 40 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpchannel.c b/app/core/gimpchannel.c
index 7d68e73..7354976 100644
--- a/app/core/gimpchannel.c
+++ b/app/core/gimpchannel.c
@@ -1684,6 +1684,14 @@ gimp_channel_new_from_component (GimpImage       *image,
   return channel;
 }
 
+GimpChannel *
+gimp_channel_get_parent (GimpChannel *channel)
+{
+  g_return_val_if_fail (GIMP_IS_CHANNEL (channel), NULL);
+
+  return GIMP_CHANNEL (gimp_viewable_get_parent (GIMP_VIEWABLE (channel)));
+}
+
 void
 gimp_channel_set_color (GimpChannel   *channel,
                         const GimpRGB *color,
diff --git a/app/core/gimpchannel.h b/app/core/gimpchannel.h
index 8618d66..5b1dd77 100644
--- a/app/core/gimpchannel.h
+++ b/app/core/gimpchannel.h
@@ -138,6 +138,8 @@ GimpChannel * gimp_channel_new_from_component (GimpImage         *image,
                                                const gchar       *name,
                                                const GimpRGB     *color);
 
+GimpChannel * gimp_channel_get_parent         (GimpChannel       *channel);
+
 gdouble       gimp_channel_get_opacity        (const GimpChannel *channel);
 void          gimp_channel_set_opacity        (GimpChannel       *channel,
                                                gdouble            opacity,
diff --git a/app/core/gimpitem.c b/app/core/gimpitem.c
index 3839831..34b0219 100644
--- a/app/core/gimpitem.c
+++ b/app/core/gimpitem.c
@@ -689,6 +689,14 @@ gimp_item_is_attached (const GimpItem *item)
   return GIMP_ITEM_GET_CLASS (item)->is_attached (item);
 }
 
+GimpItem *
+gimp_item_get_parent (GimpItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_ITEM (item), NULL);
+
+  return GIMP_ITEM (gimp_viewable_get_parent (GIMP_VIEWABLE (item)));
+}
+
 GimpItemTree *
 gimp_item_get_tree (GimpItem *item)
 {
diff --git a/app/core/gimpitem.h b/app/core/gimpitem.h
index 9810d1c..c59cb31 100644
--- a/app/core/gimpitem.h
+++ b/app/core/gimpitem.h
@@ -143,6 +143,8 @@ gboolean        gimp_item_is_removed         (const GimpItem     *item);
 
 gboolean        gimp_item_is_attached        (const GimpItem     *item);
 
+GimpItem      * gimp_item_get_parent         (GimpItem           *item);
+
 GimpItemTree  * gimp_item_get_tree           (GimpItem           *item);
 GimpContainer * gimp_item_get_container      (GimpItem           *item);
 GList         * gimp_item_get_container_iter (GimpItem           *item);
diff --git a/app/core/gimplayer.c b/app/core/gimplayer.c
index 62d3bfd..fe5892d 100644
--- a/app/core/gimplayer.c
+++ b/app/core/gimplayer.c
@@ -1339,6 +1339,14 @@ gimp_layer_new_from_region (PixelRegion          *region,
   return new_layer;
 }
 
+GimpLayer *
+gimp_layer_get_parent (GimpLayer *layer)
+{
+  g_return_val_if_fail (GIMP_IS_LAYER (layer), NULL);
+
+  return GIMP_LAYER (gimp_viewable_get_parent (GIMP_VIEWABLE (layer)));
+}
+
 GimpLayerMask *
 gimp_layer_get_mask (const GimpLayer *layer)
 {
diff --git a/app/core/gimplayer.h b/app/core/gimplayer.h
index c45d245..1ac2197 100644
--- a/app/core/gimplayer.h
+++ b/app/core/gimplayer.h
@@ -96,6 +96,8 @@ GimpLayer     * gimp_layer_new_from_region     (PixelRegion          *region,
                                                 gdouble               opacity,
                                                 GimpLayerModeEffects  mode);
 
+GimpLayer     * gimp_layer_get_parent          (GimpLayer            *layer);
+
 GimpLayerMask * gimp_layer_get_mask            (const GimpLayer      *layer);
 GimpLayerMask * gimp_layer_create_mask         (const GimpLayer      *layer,
                                                 GimpAddMaskType       mask_type,
diff --git a/app/vectors/gimpvectors.c b/app/vectors/gimpvectors.c
index e0d3aea..e570217 100644
--- a/app/vectors/gimpvectors.c
+++ b/app/vectors/gimpvectors.c
@@ -587,6 +587,14 @@ gimp_vectors_new (GimpImage   *image,
   return vectors;
 }
 
+GimpVectors *
+gimp_vectors_get_parent (GimpVectors *vectors)
+{
+  g_return_val_if_fail (GIMP_IS_VECTORS (vectors), NULL);
+
+  return GIMP_VECTORS (gimp_viewable_get_parent (GIMP_VIEWABLE (vectors)));
+}
+
 void
 gimp_vectors_freeze (GimpVectors *vectors)
 {
diff --git a/app/vectors/gimpvectors.h b/app/vectors/gimpvectors.h
index 235e925..9a91f15 100644
--- a/app/vectors/gimpvectors.h
+++ b/app/vectors/gimpvectors.h
@@ -88,6 +88,8 @@ GType           gimp_vectors_get_type           (void) G_GNUC_CONST;
 GimpVectors   * gimp_vectors_new                (GimpImage         *image,
                                                  const gchar       *name);
 
+GimpVectors   * gimp_vectors_get_parent         (GimpVectors       *vectors);
+
 void            gimp_vectors_freeze             (GimpVectors       *vectors);
 void            gimp_vectors_thaw               (GimpVectors       *vectors);
 
@@ -97,7 +99,6 @@ void            gimp_vectors_add_strokes        (const GimpVectors *src_vectors,
                                                  GimpVectors       *dest_vectors);
 
 
-
 /* accessing / modifying the anchors */
 
 GimpAnchor    * gimp_vectors_anchor_get         (const GimpVectors *vectors,