[gegl/soc-2011-seamless-clone: 37/49] Add a seamless cloning composite operation

[Barak Itkin <barakitkin src gnome org>]

commit de4a6c4593a2df160a48a792b883fe891f5bc583
Author: Barak Itkin <lightningismyname gmail com>
Date:   Sat Aug 11 16:12:58 2012 +0300

    Add a seamless cloning composite operation

 operations/common/seamless-clone/Makefile.am       |    3 +-
 .../common/seamless-clone/seamless-clone-compose.c |   95 ++++++++++++++++++++
 2 files changed, 97 insertions(+), 1 deletions(-)
---
diff --git a/operations/common/seamless-clone/Makefile.am b/operations/common/seamless-clone/Makefile.am
index 144a61e..fb3c060 100644
--- a/operations/common/seamless-clone/Makefile.am
+++ b/operations/common/seamless-clone/Makefile.am
@@ -14,9 +14,10 @@ sc_common_files =		\
 seamless_clone_la_SOURCES = seamless-clone.c $(sc_common_files)
 seamless_clone_render_la_SOURCES = seamless-clone-render.c $(sc_common_files)
 seamless_clone_prepare_la_SOURCES = seamless-clone-prepare.c $(sc_common_files)
+seamless_clone_compose_la_SOURCES = seamless-clone-compose.c
 
 opdir = $(libdir)/gegl- GEGL_API_VERSION@
 
 if HAVE_P2TC
-op_LTLIBRARIES = seamless-clone.la seamless-clone-render.la seamless-clone-prepare.la
+op_LTLIBRARIES = seamless-clone.la seamless-clone-render.la seamless-clone-prepare.la seamless-clone-compose.la
 endif
diff --git a/operations/common/seamless-clone/seamless-clone-compose.c b/operations/common/seamless-clone/seamless-clone-compose.c
new file mode 100644
index 0000000..455a8cf
--- /dev/null
+++ b/operations/common/seamless-clone/seamless-clone-compose.c
@@ -0,0 +1,95 @@
+/* This file is an image processing operation for GEGL
+ *
+ * seamless-clone-compose.c
+ * Copyright (C) 2012 Barak Itkin <lightningismyname gmail com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef GEGL_CHANT_PROPERTIES
+gegl_chant_int (max_refine_steps, _("Refinement Steps"), 0, 100000.0, 2000,
+                _("Maximal amount of refinement points to be used for the interpolation mesh"))
+
+gegl_chant_int (xoff, _("X offset"), -100000, +100000, 0,
+                _("How much horizontal offset should applied to the paste"))
+
+gegl_chant_int (yoff, _("Y offset"), -100000, +100000, 0,
+                _("How much vertical offset should applied to the paste"))
+
+gegl_chant_string (error_msg, _("Error message"), NULL, _("An error message in case of a failure"))
+#else
+
+#define GEGL_CHANT_TYPE_META
+#define GEGL_CHANT_C_FILE       "seamless-clone-compose.c"
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+#include "gegl-chant.h"
+
+static void
+attach (GeglOperation *operation)
+{
+  /**
+   * <input (BG)>                <aux (FG)>
+   *    |"output"             "output"|
+   *    |                             |
+   *    | "input"             "aux"   |
+   *    +-----> <seamless-clone> <----+
+   *    |           "output"|
+   *    |                   |
+   *    | "input"    "aux"  |
+   *    +---> <overlay> <---+
+   *            |"output"
+   *            v
+   *         <output>
+   */
+  GeglNode *gegl = operation->node;
+  GeglNode *input, *aux, *seamless, *overlay, *output;
+
+  input = gegl_node_get_input_proxy (gegl, "input");
+  aux = gegl_node_get_input_proxy (gegl, "aux");
+  seamless = gegl_node_new_child (gegl, "operation", "gegl:seamless-clone", NULL);
+  /* Don't use a regular gegl:over, since we want the alpha to be set
+   * by the background buffer - we need this for area which had opacity
+   * which was more than half but not fulll. */
+  overlay = gegl_node_new_child (gegl, "operation", "svg:src-atop", NULL);
+  output = gegl_node_get_output_proxy (gegl, "output");
+  
+  gegl_node_connect_from (input, "output", seamless, "input");
+  gegl_node_connect_from (aux, "output", seamless, "aux");
+  gegl_node_connect_from (input, "output", overlay, "input");
+  gegl_node_connect_from (seamless, "output", overlay, "aux");
+  gegl_node_connect_from (overlay, "output", output, "input");
+
+  gegl_operation_meta_redirect (operation, "max-refine-steps", seamless, "max-refine-steps");
+  gegl_operation_meta_redirect (operation, "xoff", seamless, "xoff");
+  gegl_operation_meta_redirect (operation, "yoff", seamless, "yoff");
+  gegl_operation_meta_redirect (operation, "error-msg", seamless, "error-msg");
+}
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass  *operation_class = GEGL_OPERATION_CLASS (klass);
+
+  operation_class->attach = attach;
+
+  gegl_operation_class_set_keys (operation_class,
+    "name",        "gegl:seamless-clone-compose",
+    "categories",  "compositors:meta:blend",
+    "description", "Seamless cloning composite operation",
+    NULL);
+}
+
+#endif