[gegl] added tile operation

[Ville Sokk <villesokk src gnome org>]

commit 4de19e8b38edcb1e987e04961780ebdad27b3e07
Author: Ville Sokk <ville sokk gmail com>
Date:   Tue Oct 30 21:17:24 2012 +0200

    added tile operation

 operations/common/tile.c |  112 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 112 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/tile.c b/operations/common/tile.c
new file mode 100644
index 0000000..4d42733
--- /dev/null
+++ b/operations/common/tile.c
@@ -0,0 +1,112 @@
+/* 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 2012 Ville Sokk <ville sokk gmail com>
+ */
+
+#include "config.h"
+#include <glib/gi18n-lib.h>
+
+#ifndef GEGL_CHANT_PROPERTIES
+
+#define GEGL_CHANT_TYPE_FILTER
+#define GEGL_CHANT_C_FILE "tile.c"
+
+#include "gegl-chant.h"
+
+static void
+prepare (GeglOperation *operation)
+{
+  gegl_operation_set_format (operation, "input", babl_format ("RGBA float"));
+  gegl_operation_set_format (operation, "output", babl_format ("RGBA float"));
+}
+
+static GeglRectangle
+get_bounding_box (GeglOperation *operation)
+{
+  return gegl_rectangle_infinite_plane ();
+}
+
+static GeglRectangle
+get_required_for_output (GeglOperation       *operation,
+                         const gchar         *input_pad,
+                         const GeglRectangle *roi)
+{
+  GeglRectangle *rect = gegl_operation_source_get_bounding_box (operation, input_pad);
+
+  if (rect)
+    {
+      return *rect;
+    }
+  else
+    {
+      GeglRectangle empty = {0,};
+      return empty;
+    }
+}
+
+static GeglRectangle
+get_invalidated_by_change (GeglOperation       *operation,
+                           const gchar         *input_pad,
+                           const GeglRectangle *input_roi)
+{
+  return gegl_rectangle_infinite_plane ();
+}
+
+static gboolean
+process (GeglOperation       *operation,
+         GeglBuffer          *input,
+         GeglBuffer          *output,
+         const GeglRectangle *result,
+         gint                 level)
+{
+  if (input)
+    {
+      gfloat *buf = g_new (gfloat, result->width * result->height * 4);
+
+      gegl_buffer_get (input, result, 1.0, babl_format ("RGBA float"), buf, GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_LOOP);
+
+      gegl_buffer_set (output, result, 0.0, babl_format ("RGBA float"), buf, GEGL_AUTO_ROWSTRIDE);
+
+      g_free (buf);
+
+      return TRUE;
+    }
+  return FALSE;
+}
+
+static void
+gegl_chant_class_init (GeglChantClass *klass)
+{
+  GeglOperationClass       *operation_class;
+  GeglOperationFilterClass *filter_class;
+
+  operation_class  = GEGL_OPERATION_CLASS (klass);
+  filter_class     = GEGL_OPERATION_FILTER_CLASS (klass);
+
+  filter_class->process                      = process;
+  operation_class->prepare                   = prepare;
+  operation_class->get_bounding_box          = get_bounding_box;
+  operation_class->get_required_for_output   = get_required_for_output;
+  operation_class->get_invalidated_by_change = get_invalidated_by_change;
+
+  gegl_operation_class_set_keys (operation_class,
+                                 "name", "gegl:tile",
+                                 "categories", "misc",
+                                 "description",
+                                 _("Infinitely repeats the input image."),
+                                 NULL);
+}
+#endif