diffuse: Adds diffuse element to geometrictransform

Adds the 'diffuse' element to geometrictransform. It moves
the pixels of the image in random directions

gst/geometrictransform/Makefile.am

@@ -5,6 +5,7 @@ libgstgeometrictransform_la_SOURCES = plugin.c \
                                       gstcirclegeometrictransform.c \
                                       geometricmath.c \
                                       gstcircle.c \
+                                      gstdiffuse.c \
                                       gstkaleidoscope.c \
                                       gstpinch.c \
                                       gstsphere.c \
@@ -21,6 +22,7 @@ noinst_HEADERS = gstgeometrictransform.h \
                  gstcirclegeometrictransform.h \
                  geometricmath.h \
                  gstcircle.h \
+                 gstdiffuse.h \
                  gstkaleidoscope.h \
                  gstpinch.h \
                  gstsphere.h \

gst/geometrictransform/gstdiffuse.c

@@ -0,0 +1,220 @@
+/*
+ * 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.
+ */
+
+/*
+ * Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
+ * image editor and filters. The algorithms here were extracted from
+ * his code.
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <gst/gst.h>
+#include <math.h>
+
+#include "gstdiffuse.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_diffuse_debug);
+#define GST_CAT_DEFAULT gst_diffuse_debug
+
+enum
+{
+  PROP_0,
+  PROP_SCALE
+};
+
+#define DEFAULT_SCALE 4
+
+GST_BOILERPLATE (GstDiffuse, gst_diffuse, GstGeometricTransform,
+    GST_TYPE_GEOMETRIC_TRANSFORM);
+
+static void
+gst_diffuse_set_property (GObject * object, guint prop_id, const GValue * value,
+    GParamSpec * pspec)
+{
+  GstDiffuse *diffuse;
+
+  diffuse = GST_DIFFUSE_CAST (object);
+
+  switch (prop_id) {
+    case PROP_SCALE:
+      diffuse->scale = g_value_get_double (value);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_diffuse_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstDiffuse *diffuse;
+
+  diffuse = GST_DIFFUSE_CAST (object);
+
+  switch (prop_id) {
+    case PROP_SCALE:
+      g_value_set_double (value, diffuse->scale);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+/* Clean up */
+static void
+gst_diffuse_finalize (GObject * obj)
+{
+  GstDiffuse *diffuse = GST_DIFFUSE_CAST (obj);
+
+  g_free (diffuse->sin_table);
+  g_free (diffuse->cos_table);
+
+  G_OBJECT_CLASS (parent_class)->finalize (obj);
+}
+
+/* GObject vmethod implementations */
+
+static void
+gst_diffuse_base_init (gpointer gclass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+  gst_element_class_set_details_simple (element_class,
+      "diffuse",
+      "Transform/Effect/Video",
+      "Diffuses the image by moving its pixels in random directions",
+      "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
+}
+
+static gboolean
+diffuse_prepare (GstGeometricTransform * trans)
+{
+  GstDiffuse *diffuse = GST_DIFFUSE_CAST (trans);
+  gint i;
+
+  if (diffuse->sin_table)
+    return TRUE;
+
+  diffuse->sin_table = g_malloc0 (sizeof (gdouble) * 256);
+  diffuse->cos_table = g_malloc0 (sizeof (gdouble) * 256);
+
+  for (i = 0; i < 256; i++) {
+    gdouble angle = (G_PI * 2 * i) / 256.0;
+
+    diffuse->sin_table[i] = diffuse->scale * sin (angle);
+    diffuse->cos_table[i] = diffuse->scale * cos (angle);
+  }
+  return TRUE;
+}
+
+static gboolean
+diffuse_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
+    gdouble * in_y)
+{
+  GstDiffuse *diffuse = GST_DIFFUSE_CAST (gt);
+  gint angle;
+  gdouble distance;
+
+  angle = g_random_int_range (0, 256);
+  distance = g_random_double ();
+
+  *in_x = x + distance * diffuse->sin_table[angle];
+  *in_y = y + distance * diffuse->cos_table[angle];
+
+  GST_DEBUG_OBJECT (diffuse, "Inversely mapped %d %d into %lf %lf",
+      x, y, *in_x, *in_y);
+
+  return TRUE;
+}
+
+static void
+gst_diffuse_class_init (GstDiffuseClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstGeometricTransformClass *gstgt_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gstgt_class = (GstGeometricTransformClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_diffuse_finalize);
+  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_diffuse_set_property);
+  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_diffuse_get_property);
+
+  g_object_class_install_property (gobject_class, PROP_SCALE,
+      g_param_spec_double ("scale", "scale",
+          "Scale of the texture",
+          1, G_MAXDOUBLE, DEFAULT_SCALE,
+          G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+  gstgt_class->prepare_func = diffuse_prepare;
+  gstgt_class->map_func = diffuse_map;
+}
+
+static void
+gst_diffuse_init (GstDiffuse * filter, GstDiffuseClass * gclass)
+{
+  GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
+
+  gt->precalc_map = FALSE;
+
+  gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
+  filter->scale = DEFAULT_SCALE;
+}
+
+gboolean
+gst_diffuse_plugin_init (GstPlugin * plugin)
+{
+  GST_DEBUG_CATEGORY_INIT (gst_diffuse_debug, "diffuse", 0, "diffuse");
+
+  return gst_element_register (plugin, "diffuse", GST_RANK_NONE,
+      GST_TYPE_DIFFUSE);
+}

gst/geometrictransform/gstdiffuse.h

@@ -0,0 +1,90 @@
+/*
+ * 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_DIFFUSE_H__
+#define __GST_DIFFUSE_H__
+
+#include <gst/gst.h>
+#include "gstgeometrictransform.h"
+
+G_BEGIN_DECLS
+
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_DIFFUSE \
+  (gst_diffuse_get_type())
+#define GST_DIFFUSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_DIFFUSE,GstDiffuse))
+#define GST_DIFFUSE_CAST(obj) \
+  ((GstDiffuse *)(obj))
+#define GST_DIFFUSE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_DIFFUSE,GstDiffuseClass))
+#define GST_IS_DIFFUSE(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DIFFUSE))
+#define GST_IS_DIFFUSE_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DIFFUSE))
+
+typedef struct _GstDiffuse      GstDiffuse;
+typedef struct _GstDiffuseClass GstDiffuseClass;
+
+struct _GstDiffuse
+{
+  GstGeometricTransform element;
+
+  gdouble scale;
+
+  gdouble *sin_table;
+  gdouble *cos_table;
+};
+
+struct _GstDiffuseClass
+{
+  GstGeometricTransformClass parent_class;
+};
+
+GType gst_diffuse_get_type (void);
+
+gboolean gst_diffuse_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_DIFFUSE_H__ */

gst/geometrictransform/plugin.c

@@ -22,6 +22,7 @@
 #endif
 
 #include "gstcircle.h"
+#include "gstdiffuse.h"
 #include "gstkaleidoscope.h"
 #include "gstpinch.h"
 #include "gstsphere.h"
@@ -34,6 +35,9 @@ plugin_init (GstPlugin * plugin)
   if (!gst_circle_plugin_init (plugin))
     return FALSE;
 
+  if (!gst_diffuse_plugin_init (plugin))
+    return FALSE;
+
   if (!gst_kaleidoscope_plugin_init (plugin))
     return FALSE;