geometrictransform: New plugin for geometric transforms

Adds a new plugin that has elements that perform geometric
transformations to images. By geometric transformations I mean
that the operations are functions that given the output pixel
position, get the pixel position in the input image. This pixel
is then copied from input to output.

The gstgeometrictransform baseclass makes it easy to write
such elements. It boils down to write the mapping function
and exposing properties

Already added the first of the elements, 'pinch'. It's a common
effect in image editors, like gimp (distort -> pinch)

1 files changed, 88 insertions, 0 deletions

diff --git a/gst/geometrictransform/gstpinch.h b/gst/geometrictransform/gstpinch.h
new file mode 100644
index 000000000..207c90701
--- /dev/null
+++ b/gst/geometrictransform/gstpinch.h
@@ -0,0 +1,88 @@
+/*
+ * GStreamer
+ * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Alternatively, the contents of this file may be used under the
+ * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
+ * which case the following provisions apply instead of the ones
+ * mentioned above:
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_PINCH_H__
+#define __GST_PINCH_H__
+
+#include <gst/gst.h>
+#include "gstgeometrictransform.h"
+
+G_BEGIN_DECLS
+
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_PINCH \
+  (gst_pinch_get_type())
+#define GST_PINCH(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_PINCH,GstPinch))
+#define GST_PINCH_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_PINCH,GstPinchClass))
+#define GST_IS_PINCH(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_PINCH))
+#define GST_IS_PINCH_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_PINCH))
+
+typedef struct _GstPinch      GstPinch;
+typedef struct _GstPinchClass GstPinchClass;
+
+struct _GstPinch
+{
+  GstGeometricTransform element;
+
+  gdouble x_center;
+  gdouble y_center;
+  gdouble radius;
+  gdouble intensity;
+};
+
+struct _GstPinchClass 
+{
+  GstGeometricTransformClass parent_class;
+};
+
+GType gst_pinch_get_type (void);
+
+gboolean gst_pinch_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_PINCH_H__ */