gstreamer/gst/geometrictransform/gstcirclegeometrictransform.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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "gstcirclegeometrictransform.h"
GST_DEBUG_CATEGORY_STATIC (gst_circle_geometric_transform_debug);
#define GST_CAT_DEFAULT gst_circle_geometric_transform_debug
GstGeometricTransformClass *parent_class;
enum
{
PROP_0,
PROP_X_CENTER,
PROP_Y_CENTER,
PROP_RADIUS
};
#define DEFAULT_X_CENTER 0.5
#define DEFAULT_Y_CENTER 0.5
#define DEFAULT_RADIUS 0.35
static void
gst_circle_geometric_transform_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstCircleGeometricTransform *cgt;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (object);
GST_OBJECT_LOCK (cgt);
switch (prop_id) {
case PROP_X_CENTER:
v = g_value_get_double (value);
if (v != cgt->x_center) {
cgt->x_center = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_Y_CENTER:
v = g_value_get_double (value);
if (v != cgt->y_center) {
cgt->y_center = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_RADIUS:
v = g_value_get_double (value);
if (v != cgt->radius) {
cgt->radius = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (cgt);
}
static void
gst_circle_geometric_transform_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCircleGeometricTransform *cgt;
cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (object);
switch (prop_id) {
case PROP_X_CENTER:
g_value_set_double (value, cgt->x_center);
break;
case PROP_Y_CENTER:
g_value_set_double (value, cgt->y_center);
break;
case PROP_RADIUS:
g_value_set_double (value, cgt->radius);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/* GObject vmethod implementations */
static gboolean
circle_geometric_transform_precalc (GstGeometricTransform * gt)
{
GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
cgt->precalc_x_center = cgt->x_center * gt->width;
cgt->precalc_y_center = cgt->y_center * gt->height;
cgt->precalc_radius =
cgt->radius * 0.5 * sqrt (gt->width * gt->width +
gt->height * gt->height);
cgt->precalc_radius2 = cgt->precalc_radius * cgt->precalc_radius;
return TRUE;
}
static void
gst_circle_geometric_transform_class_init (GstCircleGeometricTransformClass *
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->set_property = gst_circle_geometric_transform_set_property;
gobject_class->get_property = gst_circle_geometric_transform_get_property;
/* FIXME I don't like the idea of x-center and y-center being in % and
* radius and intensity in absolute values, I think no one likes it, but
* I can't see a way to have nice default values without % */
g_object_class_install_property (gobject_class, PROP_X_CENTER,
g_param_spec_double ("x-center", "x center",
"X axis center of the circle_geometric_transform effect",
0.0, 1.0, DEFAULT_X_CENTER,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_Y_CENTER,
g_param_spec_double ("y-center", "y center",
"Y axis center of the circle_geometric_transform effect",
0.0, 1.0, DEFAULT_Y_CENTER,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_RADIUS,
g_param_spec_double ("radius", "radius",
"radius of the circle_geometric_transform effect", 0.0, 1.0,
DEFAULT_RADIUS,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->prepare_func = circle_geometric_transform_precalc;
}
static void
gst_circle_geometric_transform_init (GstCircleGeometricTransform * filter,
GstCircleGeometricTransformClass * gclass)
{
filter->x_center = DEFAULT_X_CENTER;
filter->y_center = DEFAULT_Y_CENTER;
filter->radius = DEFAULT_RADIUS;
}
GType
gst_circle_geometric_transform_get_type (void)
{
static GType circle_geometric_transform_type = 0;
if (!circle_geometric_transform_type) {
static const GTypeInfo circle_geometric_transform_info = {
sizeof (GstCircleGeometricTransformClass),
NULL,
NULL,
(GClassInitFunc) gst_circle_geometric_transform_class_init,
NULL,
NULL,
sizeof (GstCircleGeometricTransform),
0,
(GInstanceInitFunc) gst_circle_geometric_transform_init,
};
circle_geometric_transform_type =
g_type_register_static (GST_TYPE_GEOMETRIC_TRANSFORM,
"GstCircleGeometricTransform", &circle_geometric_transform_info,
G_TYPE_FLAG_ABSTRACT);
GST_DEBUG_CATEGORY_INIT (gst_circle_geometric_transform_debug,
"circlegeometrictransform", 0,
"Base class for geometric transform elements that operate "
"on a circular area");
}
return circle_geometric_transform_type;
}