[gegl] workshop: new temporary op boxblur

[Thomas Manni <tmanni src gnome org>]

commit c78721ffacaa107be95ef98b90b77bd8795effc0
Author: Thomas Manni <thomas manni free fr>
Date:   Tue Jun 25 12:39:56 2019 +0200

    workshop: new temporary op boxblur
    
    A box blur filter meta operation which uses boxblur-1d internally.
    Eventually it will replace the current gegl:box-blur operation when
    mipmap level management and opencl support will be added.

 operations/workshop/Makefile.am |  1 +
 operations/workshop/boxblur.c   | 83 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 84 insertions(+)
---
diff --git a/operations/workshop/Makefile.am b/operations/workshop/Makefile.am
index b805083ef..5f3ac9ef0 100644
--- a/operations/workshop/Makefile.am
+++ b/operations/workshop/Makefile.am
@@ -11,6 +11,7 @@ LIBS = $(op_libs)
 ops = \
        bayer-matrix.la \
        bilateral-filter-fast.la \
+       boxblur.la \
        boxblur-1d.la \
        connected-components.la \
        demosaic-bimedian.la \
diff --git a/operations/workshop/boxblur.c b/operations/workshop/boxblur.c
new file mode 100644
index 000000000..18ba7d2c1
--- /dev/null
+++ b/operations/workshop/boxblur.c
@@ -0,0 +1,83 @@
+/* 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 <https://www.gnu.org/licenses/>.
+ *
+ * Copyright 2019 Thomas Manni <thomas manni free fr>
+ *
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifdef GEGL_PROPERTIES
+
+property_int (radius, _("Radius"), 4)
+   description(_("Radius of square pixel region, (width and height will be radius*2+1)"))
+   value_range (0, 1000)
+   ui_range    (0, 100)
+   ui_gamma   (1.5)
+
+#else
+
+#define GEGL_OP_META
+#define GEGL_OP_NAME     boxblur
+#define GEGL_OP_C_SOURCE boxblur.c
+
+#include "gegl-op.h"
+
+static void
+attach (GeglOperation *operation)
+{
+  GeglNode *gegl   = operation->node;
+  GeglNode *output = gegl_node_get_output_proxy (gegl, "output");
+
+  GeglNode *vblur  = gegl_node_new_child (gegl,
+                                          "operation", "gegl:boxblur-1d",
+                                          "orientation", 1,
+                                          NULL);
+
+  GeglNode *hblur  = gegl_node_new_child (gegl,
+                                          "operation", "gegl:boxblur-1d",
+                                          "orientation", 0,
+                                          NULL);
+
+  GeglNode *input  = gegl_node_get_input_proxy (gegl, "input");
+
+  gegl_node_link_many (input, hblur, vblur, output, NULL);
+
+  gegl_operation_meta_redirect (operation, "radius", hblur, "radius");
+  gegl_operation_meta_redirect (operation, "radius", vblur, "radius");
+
+  gegl_operation_meta_watch_nodes (operation, hblur, vblur, NULL);
+}
+
+static void
+gegl_op_class_init (GeglOpClass *klass)
+{
+  GeglOperationClass *operation_class;
+
+  operation_class = GEGL_OPERATION_CLASS (klass);
+
+  operation_class->attach = attach;
+  operation_class->threaded = FALSE;
+
+  gegl_operation_class_set_keys (operation_class,
+    "name",        "gegl:boxblur",
+    "categories",  "blur",
+    "title",       _("BoxBlur"),
+    "description", _("Blur resulting from averaging the colors of a square "
+                     "neighbourhood."),
+    NULL);
+}
+
+#endif