[gimp/goat-invasion: 64/526] app: implement gimp_layer_add_alpha() with gegl_buffer_copy()

[Michael Natterer <mitch src gnome org>]

commit a93ee7eafbb3b2326212d65b07b5e2939fd509df
Author: Michael Natterer <mitch gimp org>
Date:   Fri Mar 16 00:22:12 2012 +0100

    app: implement gimp_layer_add_alpha() with gegl_buffer_copy()

 app/core/gimplayer.c |   22 ++++++----------------
 1 files changed, 6 insertions(+), 16 deletions(-)
---
diff --git a/app/core/gimplayer.c b/app/core/gimplayer.c
index 934ea29..3b464b2 100644
--- a/app/core/gimplayer.c
+++ b/app/core/gimplayer.c
@@ -1878,8 +1878,8 @@ gimp_layer_add_alpha (GimpLayer *layer)
 {
   GimpItem      *item;
   GimpDrawable  *drawable;
-  PixelRegion    srcPR, destPR;
   TileManager   *new_tiles;
+  GeglBuffer    *dest_buffer;
   GimpImageType  new_type;
 
   g_return_if_fail (GIMP_IS_LAYER (layer));
@@ -1892,27 +1892,17 @@ gimp_layer_add_alpha (GimpLayer *layer)
 
   new_type = gimp_drawable_type_with_alpha (drawable);
 
-  /*  Allocate the new tiles  */
   new_tiles = tile_manager_new (gimp_item_get_width  (item),
                                 gimp_item_get_height (item),
                                 GIMP_IMAGE_TYPE_BYTES (new_type));
 
-  /*  Configure the pixel regions  */
-  pixel_region_init (&srcPR, gimp_drawable_get_tiles (drawable),
-                     0, 0,
-                     gimp_item_get_width  (item),
-                     gimp_item_get_height (item),
-                     FALSE);
-  pixel_region_init (&destPR, new_tiles,
-                     0, 0,
-                     gimp_item_get_width  (item),
-                     gimp_item_get_height (item),
-                     TRUE);
+  dest_buffer = gimp_tile_manager_create_buffer (new_tiles, TRUE);
 
-  /*  Add an alpha channel  */
-  add_alpha_region (&srcPR, &destPR);
+  gegl_buffer_copy (gimp_drawable_get_read_buffer (drawable), NULL,
+                    dest_buffer, NULL);
+
+  g_object_unref (dest_buffer);
 
-  /*  Set the new tiles  */
   gimp_drawable_set_tiles (GIMP_DRAWABLE (layer),
                            gimp_item_is_attached (GIMP_ITEM (layer)),
                            C_("undo-type", "Add Alpha Channel"),