gstreamer/gst/geometrictransform/gstsphere.c

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/*
* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, 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.
*/
/**
* SECTION:element-sphere
* @see_also: geometrictransform
*
* The sphere element applies a 'sphere' geometric transform to the image.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v videotestsrc ! sphere ! videoconvert ! autovideosink
* ]|
* </refsect2>
*/
#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
#define gst_sphere_parent_class parent_class
G_DEFINE_TYPE (GstSphere, gst_sphere, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
static void
gst_sphere_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstSphere *sphere;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
sphere = GST_SPHERE_CAST (object);
GST_OBJECT_LOCK (gt);
switch (prop_id) {
case PROP_REFRACTION:
v = g_value_get_double (value);
if (v != sphere->refraction) {
sphere->refraction = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (gt);
}
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;
}
}
/* 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;
GstElementClass *gstelement_class;
GstGeometricTransformClass *gstgt_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gstgt_class = (GstGeometricTransformClass *) klass;
gst_element_class_set_static_metadata (gstelement_class,
"sphere",
"Transform/Effect/Video",
"Applies 'sphere' geometric transform to the image",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
gobject_class->set_property = gst_sphere_set_property;
gobject_class->get_property = 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,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = sphere_map;
}
static void
gst_sphere_init (GstSphere * filter)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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);
}