1 files changed, 45 insertions, 0 deletions
diff --git a/chalk/plugins/viewplugins/scripting/samples/ruby/invert.rb b/chalk/plugins/viewplugins/scripting/samples/ruby/invert.rb
new file mode 100644
index 00000000..d9ad32f7
--- /dev/null
+++ b/chalk/plugins/viewplugins/scripting/samples/ruby/invert.rb
@@ -0,0 +1,45 @@
+# This file is part of Chalk
+#
+# Copyright (c) 2005-2006 Cyrille Berger <[email protected]>
+#
+#  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 2 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, write to the Free Software
+#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+
+require "krosschalkcore"
+
+doc = Krosschalkcore::get("ChalkDocument")
+script = Krosschalkcore::get("ChalkScript")
+image = doc.getImage()
+layer = image.getActivePaintLayer()
+
+if(layer.colorSpaceId() != "RGBA" )
+    raise("This script works only for 8bit RGBA layers")
+end
+
+width = layer.getWidth()
+height = layer.getHeight()
+script.setProgressTotalSteps(width * height)
+layer.beginPainting("invert")
+it = layer.createRectIterator( 0, 0, width, height )
+while (it.isDone() == 0)
+    p = it.getRGBA()
+    p[0] = 255 - p[0]
+    p[1] = 255 - p[1]
+    p[2] = 255 - p[2]
+    it.setRGBA(p)
+    script.incProgress()
+    it.next()
+end
+
+layer.endPainting()