[gimp/soc-2011-seamless-clone2] app: add gimp_applicator_dup_apply_buffer()

[Clayton Walker <claytonw src gnome org>]

commit 3d42c34aaf3a97ffdbddce7ec411eae003642890
Author: Michael Natterer <mitch gimp org>
Date:   Mon Apr 22 10:54:05 2013 +0200

    app: add gimp_applicator_dup_apply_buffer()
    
    which copies a rectangle of the layer mode node's "aux" input into
    a newly allocated buffer.

 app/gegl/gimpapplicator.c |   40 +++++++++++++++++++++++++++++
 app/gegl/gimpapplicator.h |   61 +++++++++++++++++++++++---------------------
 2 files changed, 72 insertions(+), 29 deletions(-)
---
diff --git a/app/gegl/gimpapplicator.c b/app/gegl/gimpapplicator.c
index fee2482..90787a9 100644
--- a/app/gegl/gimpapplicator.c
+++ b/app/gegl/gimpapplicator.c
@@ -408,3 +408,43 @@ gimp_applicator_blit (GimpApplicator      *applicator,
   gegl_node_blit (applicator->dest_node, 1.0, rect,
                   NULL, NULL, 0, GEGL_BLIT_DEFAULT);
 }
+
+GeglBuffer *
+gimp_applicator_dup_apply_buffer (GimpApplicator      *applicator,
+                                  const GeglRectangle *rect)
+{
+  GeglBuffer *buffer;
+  GeglNode   *offset;
+  GeglNode   *dest;
+
+  buffer = gegl_buffer_new (GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+                            babl_format ("RGBA float"));
+
+  offset = gegl_node_new_child (applicator->node,
+                                "operation", "gegl:translate",
+                                "x",
+                                (gdouble) - applicator->apply_offset_x - rect->x,
+                                "y",
+                                (gdouble) - applicator->apply_offset_y - rect->y,
+                                NULL);
+
+  dest = gegl_node_new_child (applicator->node,
+                              "operation", "gegl:write-buffer",
+                              "buffer",    buffer,
+                              NULL);
+
+  gegl_node_link_many (applicator->apply_offset_node,
+                       offset,
+                       dest,
+                       NULL);
+
+  gegl_node_blit (dest, 1.0, GEGL_RECTANGLE (0, 0, rect->width, rect->height),
+                  NULL, NULL, 0, GEGL_BLIT_DEFAULT);
+
+  gegl_node_disconnect (offset, "input");
+
+  gegl_node_remove_child (applicator->node, offset);
+  gegl_node_remove_child (applicator->node, dest);
+
+  return buffer;
+}
diff --git a/app/gegl/gimpapplicator.h b/app/gegl/gimpapplicator.h
index cf624d9..c979c14 100644
--- a/app/gegl/gimpapplicator.h
+++ b/app/gegl/gimpapplicator.h
@@ -75,35 +75,38 @@ struct _GimpApplicatorClass
 };
 
 
-GType   gimp_applicator_get_type         (void) G_GNUC_CONST;
-
-GimpApplicator * gimp_applicator_new     (GeglNode             *parent);
-
-void    gimp_applicator_set_src_buffer   (GimpApplicator       *applicator,
-                                          GeglBuffer           *dest_buffer);
-void    gimp_applicator_set_dest_buffer  (GimpApplicator       *applicator,
-                                          GeglBuffer           *dest_buffer);
-
-void    gimp_applicator_set_mask_buffer  (GimpApplicator       *applicator,
-                                          GeglBuffer           *mask_buffer);
-void    gimp_applicator_set_mask_offset  (GimpApplicator       *applicator,
-                                          gint                  mask_offset_x,
-                                          gint                  mask_offset_y);
-
-void    gimp_applicator_set_apply_buffer (GimpApplicator       *applicator,
-                                          GeglBuffer           *apply_buffer);
-void    gimp_applicator_set_apply_offset (GimpApplicator       *applicator,
-                                          gint                  apply_offset_x,
-                                          gint                  apply_offset_y);
-
-void    gimp_applicator_set_mode         (GimpApplicator       *applicator,
-                                          gdouble               opacity,
-                                          GimpLayerModeEffects  paint_mode);
-void    gimp_applicator_set_affect       (GimpApplicator       *applicator,
-                                          GimpComponentMask     affect);
-
-void    gimp_applicator_blit             (GimpApplicator       *applicator,
-                                          const GeglRectangle  *rect);
+GType        gimp_applicator_get_type         (void) G_GNUC_CONST;
+
+GimpApplicator * gimp_applicator_new          (GeglNode             *parent);
+
+void         gimp_applicator_set_src_buffer   (GimpApplicator       *applicator,
+                                               GeglBuffer           *dest_buffer);
+void         gimp_applicator_set_dest_buffer  (GimpApplicator       *applicator,
+                                               GeglBuffer           *dest_buffer);
+
+void         gimp_applicator_set_mask_buffer  (GimpApplicator       *applicator,
+                                               GeglBuffer           *mask_buffer);
+void         gimp_applicator_set_mask_offset  (GimpApplicator       *applicator,
+                                               gint                  mask_offset_x,
+                                               gint                  mask_offset_y);
+
+void         gimp_applicator_set_apply_buffer (GimpApplicator       *applicator,
+                                               GeglBuffer           *apply_buffer);
+void         gimp_applicator_set_apply_offset (GimpApplicator       *applicator,
+                                               gint                  apply_offset_x,
+                                               gint                  apply_offset_y);
+
+void         gimp_applicator_set_mode         (GimpApplicator       *applicator,
+                                               gdouble               opacity,
+                                               GimpLayerModeEffects  paint_mode);
+void         gimp_applicator_set_affect       (GimpApplicator       *applicator,
+                                               GimpComponentMask     affect);
+
+void         gimp_applicator_blit             (GimpApplicator       *applicator,
+                                               const GeglRectangle  *rect);
+
+GeglBuffer * gimp_applicator_dup_apply_buffer (GimpApplicator       *applicator,
+                                               const GeglRectangle  *rect);
 
 
 #endif  /*  __GIMP_APPLICATOR_H__  */