[gimp] Add functions to count the items in an image

[Michael Natterer <mitch src gnome org>]

commit 6be068ceab39bb8f8ea1a6a5d0adbda267a4499b
Author: Michael Natterer <mitch gimp org>
Date:   Sun Aug 2 12:12:01 2009 +0200

    Add functions to count the items in an image
    
    * app/core/gimpitemstack.[ch]: add gimp_item_stack_get_n_items()
      which counts a stack's items recursively.
    
    * app/core/gimpimage.[ch]: add get_n_layers(), get_n_channels()
      and get_n_vectors().

 app/core/gimpimage.c     |   24 ++++++++++++++++++++++++
 app/core/gimpimage.h     |    4 ++++
 app/core/gimpitemstack.c |   24 ++++++++++++++++++++++++
 app/core/gimpitemstack.h |    1 +
 4 files changed, 53 insertions(+), 0 deletions(-)
---
diff --git a/app/core/gimpimage.c b/app/core/gimpimage.c
index 30fe046..c71fca2 100644
--- a/app/core/gimpimage.c
+++ b/app/core/gimpimage.c
@@ -2649,6 +2649,30 @@ gimp_image_get_vectors (const GimpImage *image)
   return image->vectors;
 }
 
+gint
+gimp_image_get_n_layers (const GimpImage *image)
+{
+  g_return_val_if_fail (GIMP_IS_IMAGE (image), 0);
+
+  return gimp_item_stack_get_n_items (GIMP_ITEM_STACK (image->layers));
+}
+
+gint
+gimp_image_get_n_channels (const GimpImage *image)
+{
+  g_return_val_if_fail (GIMP_IS_IMAGE (image), 0);
+
+  return gimp_item_stack_get_n_items (GIMP_ITEM_STACK (image->channels));
+}
+
+gint
+gimp_image_get_n_vectors (const GimpImage *image)
+{
+  g_return_val_if_fail (GIMP_IS_IMAGE (image), 0);
+
+  return gimp_item_stack_get_n_items (GIMP_ITEM_STACK (image->vectors));
+}
+
 GList *
 gimp_image_get_layer_iter (const GimpImage *image)
 {
diff --git a/app/core/gimpimage.h b/app/core/gimpimage.h
index 5b00135..eae1124 100644
--- a/app/core/gimpimage.h
+++ b/app/core/gimpimage.h
@@ -421,6 +421,10 @@ GimpContainer * gimp_image_get_layers            (const GimpImage    *image);
 GimpContainer * gimp_image_get_channels          (const GimpImage    *image);
 GimpContainer * gimp_image_get_vectors           (const GimpImage    *image);
 
+gint            gimp_image_get_n_layers          (const GimpImage    *image);
+gint            gimp_image_get_n_channels        (const GimpImage    *image);
+gint            gimp_image_get_n_vectors         (const GimpImage    *image);
+
 GList         * gimp_image_get_layer_iter        (const GimpImage    *image);
 GList         * gimp_image_get_channel_iter      (const GimpImage    *image);
 GList         * gimp_image_get_vectors_iter      (const GimpImage    *image);
diff --git a/app/core/gimpitemstack.c b/app/core/gimpitemstack.c
index 112b89a..5d6c8de 100644
--- a/app/core/gimpitemstack.c
+++ b/app/core/gimpitemstack.c
@@ -116,6 +116,30 @@ gimp_item_stack_new (GType item_type)
                        NULL);
 }
 
+gint
+gimp_item_stack_get_n_items (GimpItemStack *stack)
+{
+  GList *list;
+  gint   n_items = 0;
+
+  g_return_val_if_fail (GIMP_IS_ITEM_STACK (stack), 0);
+
+  for (list = GIMP_LIST (stack)->list; list; list = g_list_next (list))
+    {
+      GimpItem      *item = list->data;
+      GimpContainer *children;
+
+      n_items++;
+
+      children = gimp_viewable_get_children (GIMP_VIEWABLE (item));
+
+      if (children)
+        n_items += gimp_item_stack_get_n_items (GIMP_ITEM_STACK (children));
+    }
+
+  return n_items;
+}
+
 GList *
 gimp_item_stack_get_item_list (GimpItemStack *stack)
 {
diff --git a/app/core/gimpitemstack.h b/app/core/gimpitemstack.h
index 29cc91e..da3cb19 100644
--- a/app/core/gimpitemstack.h
+++ b/app/core/gimpitemstack.h
@@ -47,6 +47,7 @@ struct _GimpItemStackClass
 GType           gimp_item_stack_get_type            (void) G_GNUC_CONST;
 GimpContainer * gimp_item_stack_new                 (GType          item_type);
 
+gint            gimp_item_stack_get_n_items         (GimpItemStack *stack);
 GList         * gimp_item_stack_get_item_list       (GimpItemStack *stack);
 GimpItem      * gimp_item_stack_get_item_by_tattoo  (GimpItemStack *stack,
                                                      GimpTattoo     tattoo);