[gegl] operations: added high-pass filter

[Ville Sokk <villesokk src gnome org>]

commit 2b04fbb2618e1e8005e3e99cae27b3aeefb2a0f8
Author: Ville Sokk <ville sokk gmail com>
Date:   Fri Jun 14 21:27:14 2013 +0300

    operations: added high-pass filter

 operations/common/high-pass.c |   78 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/high-pass.c b/operations/common/high-pass.c
new file mode 100644
index 0000000..068e788
--- /dev/null
+++ b/operations/common/high-pass.c
@@ -0,0 +1,78 @@
+/* This file is an image processing operation for GEGL
+ *
+ * GEGL is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * GEGL 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2013 Ville Sokk <ville sokk gmail com>
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifdef GEGL_CHANT_PROPERTIES
+
+gegl_chant_double_ui (std_dev, _("Std. Dev."), 0.0, 10000.0, 4.0, 0.0, 1000.0,
+                      1.5, _("Standard deviation (spatial scale factor)"))
+gegl_chant_double_ui (contrast, _("Contrast"), 0.0, 5.0, 1.0,
+                      0.0, 5.0, 1.0, _("Contrast of high-pass"))
+
+#else
+
+#define GEGL_CHANT_TYPE_META
+#define GEGL_CHANT_C_FILE "high-pass.c"
+
+#include "gegl-chant.h"
+
+static void
+attach (GeglOperation *operation)
+{
+  GeglNode *gegl, *input, *output, *invert, *blur, *opacity, *over, *contrast;
+
+  gegl = operation->node;
+  input = gegl_node_get_input_proxy (gegl, "input");
+  output = gegl_node_get_output_proxy (gegl, "output");
+  invert = gegl_node_new_child (gegl, "operation", "gegl:invert", NULL);
+  blur = gegl_node_new_child (gegl, "operation", "gegl:gaussian-blur", NULL);
+  opacity = gegl_node_new_child (gegl, "operation", "gegl:opacity",
+                                 "value", 0.5, NULL);
+  over = gegl_node_new_child (gegl, "operation", "gegl:over", NULL);
+  contrast = gegl_node_new_child (gegl, "operation",
+                                  "gegl:brightness-contrast", NULL);
+
+  gegl_node_link_many (input, invert, blur, opacity, NULL);
+  gegl_node_connect_to (opacity, "output", over, "aux");
+  gegl_node_link_many (input, over, contrast, output, NULL);
+
+  gegl_operation_meta_redirect (operation, "std-dev", blur, "std-dev-x");
+  gegl_operation_meta_redirect (operation, "std-dev", blur, "std-dev-y");
+  gegl_operation_meta_redirect (operation, "contrast", contrast, "contrast");
+}
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass *operation_class;
+
+  operation_class = GEGL_OPERATION_CLASS (klass);
+
+  operation_class->attach = attach;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name",        "gegl:high-pass",
+                                 "categories",  "meta:enhance",
+                                 "description",
+                                 _("Enhances fine details."),
+                                 NULL);
+}
+
+#endif