[gegl] examples: add a test that does processing with GI and py

[Øyvind Kolås <ok src gnome org>]

commit 3cbc23447f6179fa08d7130cca2ca0fb116a8fdb
Author: �yvind Kolås <pippin gimp org>
Date:   Sun Apr 24 12:44:25 2011 +0100

    examples: add a test that does processing with GI and py

 examples/gi-test.py |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)
---
diff --git a/examples/gi-test.py b/examples/gi-test.py
new file mode 100755
index 0000000..9a7d08d
--- /dev/null
+++ b/examples/gi-test.py
@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+import gi
+from gi.repository import Gegl
+
+# extend GEGL binding with some utility function, making it possible to lookup
+# a node among the children of a node giving one with a specified name. A
+# GEGL binding based on gobject introspection could contain some other such,
+# that makes << and other things used in the py/ruby bindings before possible,
+# this binding would itself just import things using GI
+
+# This is a very minimal example, that doesnt even construct the graph and
+# instantiate the nodes, but cheats and uses XML to get at an intial graph.
+# it expect a file /tmp/lena.png to exist
+
+def locate_by_type(self, opname):
+  for i in self.get_children():
+     if i.get_operation() == opname:
+        return i
+Gegl.Node.locate_by_type = locate_by_type
+
+
+if __name__ == '__main__':
+
+    Gegl.init(0,"")  # < that is rather ugly
+
+    node = Gegl.Node.new_from_xml("""
+      <gegl>
+        <gegl:save path='/tmp/output.png'/>
+        <gegl:crop width='512' height='512'/>
+        <gegl:over >
+          <gegl:translate x='30' y='30'/>
+          <gegl:dropshadow radius='1.5' x='3' y='3'/>
+          <gegl:text size='80' color='white'
+><params><param name='string'>GEGL
+ I
+ R</param></params></gegl:text>
+        </gegl:over>
+        <gegl:unsharp-mask std-dev='30'/>
+        <gegl:load path='/tmp/lena.png'/>
+      </gegl>
+""", "/");
+
+    node.locate_by_type('gegl:save').process()