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, 69 insertions, 0 deletions

diff --git a/gst/geometrictransform/gstgeometrictransform.h b/gst/geometrictransform/gstgeometrictransform.h
new file mode 100644
index 000000000..e1d5ffae2
--- /dev/null
+++ b/gst/geometrictransform/gstgeometrictransform.h
@@ -0,0 +1,69 @@
+/* GStreamer
+ * Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * 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_GEOMETRIC_TRANSFORM_H__
+#define __GST_GEOMETRIC_TRANSFORM_H__
+
+#include <gst/video/gstvideofilter.h>
+#include <gst/video/video.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_GEOMETRIC_TRANSFORM \
+  (gst_geometric_transform_get_type())
+#define GST_GEOMETRIC_TRANSFORM(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransform))
+#define GST_GEOMETRIC_TRANSFORM_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransformClass))
+#define GST_IS_GEOMETRIC_TRANSFORM(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GEOMETRIC_TRANSFORM))
+#define GST_IS_GEOMETRIC_TRANSFORM_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GEOMETRIC_TRANSFORM))
+#define GST_GEOMETRIC_TRANSFORM_GET_CLASS(obj) \
+  (G_TYPE_INSTANCE_GET_CLASS((obj),GST_TYPE_GEOMETRIC_TRANSFORM,GstGeometricTransformClass))
+
+typedef struct _GstGeometricTransform GstGeometricTransform;
+typedef struct _GstGeometricTransformClass GstGeometricTransformClass;
+
+typedef gboolean (*GstGeometricTransformMapFunc) (GstGeometricTransform * gt,
+    gint x, gint y, gdouble * _out_x, gdouble *_out_y);
+
+/**
+ * GstGeometricTransform:
+ *
+ * Opaque datastructure.
+ */
+struct _GstGeometricTransform {
+  GstVideoFilter videofilter;
+
+  gint width, height;
+  GstVideoFormat format;
+};
+
+struct _GstGeometricTransformClass {
+  GstVideoFilterClass parent_class;
+
+  GstGeometricTransformMapFunc map_func;
+};
+
+GType gst_geometric_transform_get_type (void);
+
+G_END_DECLS
+
+#endif /* __GST_GEOMETRIC_TRANSFORM_H__ */