--- /dev/null
+/*
+ * 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 "gstsphere.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_sphere_debug);
+#define GST_CAT_DEFAULT gst_sphere_debug
+
+enum
+{
+ PROP_0,
+ PROP_REFRACTION
+};
+
+#define DEFAULT_REFRACTION 1.5
+
+GST_BOILERPLATE (GstSphere, gst_sphere, GstCircleGeometricTransform,
+ GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
+
+static void
+gst_sphere_set_property (GObject * object, guint prop_id, const GValue * value,
+ GParamSpec * pspec)
+{
+ GstSphere *sphere;
+
+ sphere = GST_SPHERE_CAST (object);
+
+ switch (prop_id) {
+ case PROP_REFRACTION:
+ sphere->refraction = g_value_get_double (value);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gst_sphere_get_property (GObject * object, guint prop_id,
+ GValue * value, GParamSpec * pspec)
+{
+ GstSphere *sphere;
+
+ sphere = GST_SPHERE_CAST (object);
+
+ switch (prop_id) {
+ case PROP_REFRACTION:
+ g_value_set_double (value, sphere->refraction);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+/* Clean up */
+static void
+gst_sphere_finalize (GObject * obj)
+{
+ G_OBJECT_CLASS (parent_class)->finalize (obj);
+}
+
+/* GObject vmethod implementations */
+
+static void
+gst_sphere_base_init (gpointer gclass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (gclass);
+
+ gst_element_class_set_details_simple (element_class,
+ "sphere",
+ "Transform/Effect/Video",
+ "Applies 'sphere' geometric transform to the image",
+ "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
+}
+
+/* TODO we could have horizontal and vertical 'radius' */
+static gboolean
+sphere_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
+ gdouble * in_y)
+{
+ GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
+ GstSphere *sphere = GST_SPHERE_CAST (gt);
+ gdouble dx, dy;
+ gdouble dx2, dy2;
+
+ dx = x - cgt->precalc_x_center;
+ dy = y - cgt->precalc_y_center;
+ dx2 = dx * dx;
+ dy2 = dy * dy;
+
+ if (dy2 >=
+ (cgt->precalc_radius2 -
+ (cgt->precalc_radius2 * dx2) / cgt->precalc_radius2)) {
+ *in_x = x;
+ *in_y = y;
+ } else {
+ gdouble r_refraction = 1.0 / sphere->refraction;
+ gdouble z;
+ gdouble z2;
+ gdouble angle;
+ gdouble angle1;
+ gdouble angle2;
+
+ z = sqrt ((1.0 - dx2 / cgt->precalc_radius2 -
+ dy2 / cgt->precalc_radius2) * (cgt->precalc_radius2));
+ z2 = z * z;
+
+ /* x */
+ angle = acos (dx / sqrt (dx2 + z2));
+ angle1 = G_PI / 2 - angle;
+ angle2 = asin (sin (angle1) * r_refraction);
+ angle2 = G_PI / 2 - angle - angle2;
+ *in_x = x - tan (angle2) * z;
+
+ /* y */
+ angle = acos (dy / sqrt (dy2 + z2));
+ angle1 = G_PI / 2 - angle;
+ angle2 = asin (sin (angle1) * r_refraction);
+ angle2 = G_PI / 2 - angle - angle2;
+ *in_y = y - tan (angle2) * z;
+ }
+
+ GST_DEBUG_OBJECT (sphere, "Inversely mapped %d %d into %lf %lf",
+ x, y, *in_x, *in_y);
+
+ return TRUE;
+}
+
+static void
+gst_sphere_class_init (GstSphereClass * 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_sphere_finalize);
+ gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_sphere_set_property);
+ gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_sphere_get_property);
+
+ g_object_class_install_property (gobject_class, PROP_REFRACTION,
+ g_param_spec_double ("refraction", "refraction",
+ "refraction index",
+ -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_REFRACTION,
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
+ gstgt_class->map_func = sphere_map;
+}
+
+static void
+gst_sphere_init (GstSphere * filter, GstSphereClass * gclass)
+{
+ filter->refraction = DEFAULT_REFRACTION;
+}
+
+gboolean
+gst_sphere_plugin_init (GstPlugin * plugin)
+{
+ GST_DEBUG_CATEGORY_INIT (gst_sphere_debug, "sphere", 0, "sphere");
+
+ return gst_element_register (plugin, "sphere", GST_RANK_NONE,
+ GST_TYPE_SPHERE);
+}
--- /dev/null
+/*
+ * 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_SPHERE_H__
+#define __GST_SPHERE_H__
+
+#include <gst/gst.h>
+#include "gstcirclegeometrictransform.h"
+
+G_BEGIN_DECLS
+
+/* #defines don't like whitespacey bits */
+#define GST_TYPE_SPHERE \
+ (gst_sphere_get_type())
+#define GST_SPHERE(obj) \
+ (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SPHERE,GstSphere))
+#define GST_SPHERE_CAST(obj) \
+ ((GstSphere *)(obj))
+#define GST_SPHERE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SPHERE,GstSphereClass))
+#define GST_IS_SPHERE(obj) \
+ (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SPHERE))
+#define GST_IS_SPHERE_CLASS(klass) \
+ (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SPHERE))
+
+typedef struct _GstSphere GstSphere;
+typedef struct _GstSphereClass GstSphereClass;
+
+struct _GstSphere
+{
+ GstCircleGeometricTransform element;
+
+ gdouble refraction;
+};
+
+struct _GstSphereClass
+{
+ GstCircleGeometricTransformClass parent_class;
+};
+
+GType gst_sphere_get_type (void);
+
+gboolean gst_sphere_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+
+#endif /* __GST_SPHERE_H__ */
projects / platform / upstream / gstreamer.git / commitdiff