gstreamer/gst/geometrictransform/gstkaleidoscope.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-kaleidoscope
* @see_also: geometrictransform
*
* The kaleidscope element applies 'kaleidoscope' geometric transform to the
* image.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v videotestsrc ! kaleidoscope ! videoconvert ! autovideosink
* ]|
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "geometricmath.h"
#include "gstkaleidoscope.h"
GST_DEBUG_CATEGORY_STATIC (gst_kaleidoscope_debug);
#define GST_CAT_DEFAULT gst_kaleidoscope_debug
enum
{
PROP_0,
PROP_ANGLE,
PROP_ANGLE2,
PROP_SIDES
};
#define DEFAULT_ANGLE 0
#define DEFAULT_ANGLE2 0
#define DEFAULT_SIDES 3
#define gst_kaleidoscope_parent_class parent_class
G_DEFINE_TYPE (GstKaleidoscope, gst_kaleidoscope,
GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
static void
gst_kaleidoscope_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstKaleidoscope *kaleidoscope;
GstGeometricTransform *gt;
gdouble v;
gint s;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
GST_OBJECT_LOCK (gt);
switch (prop_id) {
case PROP_ANGLE:
v = g_value_get_double (value);
if (v != kaleidoscope->angle) {
kaleidoscope->angle = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_ANGLE2:
v = g_value_get_double (value);
if (v != kaleidoscope->angle2) {
kaleidoscope->angle2 = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_SIDES:
s = g_value_get_int (value);
if (s != kaleidoscope->sides) {
kaleidoscope->sides = s;
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_kaleidoscope_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstKaleidoscope *kaleidoscope;
kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
switch (prop_id) {
case PROP_ANGLE:
g_value_set_double (value, kaleidoscope->angle);
break;
case PROP_ANGLE2:
g_value_set_double (value, kaleidoscope->angle2);
break;
case PROP_SIDES:
g_value_set_int (value, kaleidoscope->sides);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
kaleidoscope_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
GstKaleidoscope *kaleidoscope = GST_KALEIDOSCOPE_CAST (gt);
gdouble dx, dy;
gdouble distance;
gdouble theta;
dx = x - cgt->precalc_x_center;
dy = y - cgt->precalc_y_center;
distance = sqrt (dx * dx + dy * dy);
theta = atan2 (dy, dx) - kaleidoscope->angle - kaleidoscope->angle2;
theta = gst_gm_triangle (theta / G_PI * kaleidoscope->sides * 0.5);
if (cgt->precalc_radius != 0) {
gdouble radiusc = cgt->precalc_radius / cos (theta);
distance = radiusc * gst_gm_triangle (distance / radiusc);
}
theta += kaleidoscope->angle;
*in_x = cgt->precalc_x_center + distance * cos (theta);
*in_y = cgt->precalc_y_center + distance * sin (theta);
GST_DEBUG_OBJECT (kaleidoscope, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}
static void
gst_kaleidoscope_class_init (GstKaleidoscopeClass * 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,
"kaleidoscope",
"Transform/Effect/Video",
"Applies 'kaleidoscope' geometric transform to the image",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
gobject_class->set_property = gst_kaleidoscope_set_property;
gobject_class->get_property = gst_kaleidoscope_get_property;
g_object_class_install_property (gobject_class, PROP_ANGLE,
g_param_spec_double ("angle", "angle",
"primary angle in radians of the kaleidoscope effect",
-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_ANGLE2,
g_param_spec_double ("angle2", "angle2",
"secondary angle in radians of the kaleidoscope effect",
-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SIDES,
g_param_spec_int ("sides", "sides", "Number of sides of the kaleidoscope",
2, G_MAXINT, DEFAULT_SIDES,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = kaleidoscope_map;
}
static void
gst_kaleidoscope_init (GstKaleidoscope * filter)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
filter->angle = DEFAULT_ANGLE;
filter->angle2 = DEFAULT_ANGLE2;
filter->sides = DEFAULT_SIDES;
}
gboolean
gst_kaleidoscope_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_kaleidoscope_debug, "kaleidoscope", 0,
"kaleidoscope");
return gst_element_register (plugin, "kaleidoscope", GST_RANK_NONE,
GST_TYPE_KALEIDOSCOPE);
}