[gimp/soc-2011-seamless-clone2] app: make floating selection compositing honor the image's active components

[Clayton Walker <claytonw src gnome org>]

commit 3d5390991bdde42e28fefb9795d44866a470701e
Author: Michael Natterer <mitch gimp org>
Date:   Fri Apr 12 15:53:19 2013 +0200

    app: make floating selection compositing honor the image's active components
    
    This was a regression from 2.8

 app/core/gimpdrawable-private.h |    1 +
 app/core/gimpdrawable.c         |   37 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpdrawable-private.h b/app/core/gimpdrawable-private.h
index db1c5ab..d9ce456 100644
--- a/app/core/gimpdrawable-private.h
+++ b/app/core/gimpdrawable-private.h
@@ -32,6 +32,7 @@ struct _GimpDrawablePrivate
   GeglNode      *fs_crop_node;
   GeglNode      *fs_offset_node;
   GeglNode      *fs_mode_node;
+  GeglNode      *fs_affect_node;
 
   GeglNode      *mode_node;
 };
diff --git a/app/core/gimpdrawable.c b/app/core/gimpdrawable.c
index 1aa3b10..78db80d 100644
--- a/app/core/gimpdrawable.c
+++ b/app/core/gimpdrawable.c
@@ -36,6 +36,7 @@
 #include "gimpchannel.h"
 #include "gimpcontext.h"
 #include "gimpdrawable-combine.h"
+#include "gimpdrawable-filter.h"
 #include "gimpdrawable-preview.h"
 #include "gimpdrawable-private.h"
 #include "gimpdrawable-shadow.h"
@@ -178,6 +179,9 @@ static void       gimp_drawable_sync_fs_filter     (GimpDrawable      *drawable,
 static void       gimp_drawable_fs_notify          (GimpLayer         *fs,
                                                     const GParamSpec  *pspec,
                                                     GimpDrawable      *drawable);
+static void       gimp_drawable_fs_image_changed   (GimpImage         *image,
+                                                    GimpChannelType    channel,
+                                                    GimpDrawable      *drawable);
 static void       gimp_drawable_fs_update          (GimpLayer         *fs,
                                                     gint               x,
                                                     gint               y,
@@ -940,7 +944,18 @@ gimp_drawable_create_fs_filter (GimpDrawable *drawable,
                         drawable->private->fs_mode_node,   "input");
   gegl_node_connect_to (drawable->private->fs_offset_node, "output",
                         drawable->private->fs_mode_node,   "aux");
+
+  drawable->private->fs_affect_node =
+    gegl_node_new_child (node,
+                         "operation", "gimp:mask-components",
+                         "mask",      GIMP_COMPONENT_ALL,
+                         NULL);
+
+  gegl_node_connect_to (input,                             "output",
+                        drawable->private->fs_affect_node, "input");
   gegl_node_connect_to (drawable->private->fs_mode_node,   "output",
+                        drawable->private->fs_affect_node, "aux");
+  gegl_node_connect_to (drawable->private->fs_affect_node, "output",
                         output,                            "input");
 
   return filter;
@@ -950,7 +965,8 @@ static void
 gimp_drawable_sync_fs_filter (GimpDrawable *drawable,
                               gboolean      detach_fs)
 {
-  GimpLayer *fs = gimp_drawable_get_floating_sel (drawable);
+  GimpImage *image = gimp_item_get_image (GIMP_ITEM (drawable));
+  GimpLayer *fs    = gimp_drawable_get_floating_sel (drawable);
 
   if (! drawable->private->source_node)
     return;
@@ -984,6 +1000,9 @@ gimp_drawable_sync_fs_filter (GimpDrawable *drawable,
           g_signal_connect (fs, "notify",
                             G_CALLBACK (gimp_drawable_fs_notify),
                             drawable);
+          g_signal_connect (image, "component-active-changed",
+                            G_CALLBACK (gimp_drawable_fs_image_changed),
+                            drawable);
         }
 
       gimp_item_get_offset (GIMP_ITEM (drawable), &off_x, &off_y);
@@ -1005,6 +1024,10 @@ gimp_drawable_sync_fs_filter (GimpDrawable *drawable,
                                gimp_layer_get_mode (fs),
                                gimp_layer_get_opacity (fs),
                                FALSE);
+
+      gegl_node_set (drawable->private->fs_affect_node,
+                     "mask", gimp_drawable_get_active_mask (drawable),
+                     NULL);
     }
   else
     {
@@ -1015,6 +1038,9 @@ gimp_drawable_sync_fs_filter (GimpDrawable *drawable,
           g_signal_handlers_disconnect_by_func (fs,
                                                 gimp_drawable_fs_notify,
                                                 drawable);
+          g_signal_handlers_disconnect_by_func (image,
+                                                gimp_drawable_fs_image_changed,
+                                                drawable);
 
           gimp_drawable_remove_filter (drawable, drawable->private->fs_filter);
 
@@ -1038,6 +1064,7 @@ gimp_drawable_sync_fs_filter (GimpDrawable *drawable,
           drawable->private->fs_crop_node   = NULL;
           drawable->private->fs_offset_node = NULL;
           drawable->private->fs_mode_node   = NULL;
+          drawable->private->fs_affect_node = NULL;
         }
     }
 }
@@ -1058,6 +1085,14 @@ gimp_drawable_fs_notify (GimpLayer        *fs,
 }
 
 static void
+gimp_drawable_fs_image_changed (GimpImage       *image,
+                                GimpChannelType  channel,
+                                GimpDrawable    *drawable)
+{
+  gimp_drawable_sync_fs_filter (drawable, FALSE);
+}
+
+static void
 gimp_drawable_fs_update (GimpLayer    *fs,
                          gint          x,
                          gint          y,