gstreamer/gst/geometrictransform/gstcircle.c
2021-04-11 16:16:55 +00:00

236 lines
7.2 KiB
C

/*
* 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-circle
* @title: circle
* @see_also: geometrictransform
*
* Circle is a geometric image transform element. It warps the picture into an
* arc shaped form.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc ! circle ! videoconvert ! autovideosink
* ]|
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "geometricmath.h"
#include "gstcircle.h"
GST_DEBUG_CATEGORY_STATIC (gst_circle_debug);
#define GST_CAT_DEFAULT gst_circle_debug
enum
{
PROP_0,
PROP_ANGLE,
PROP_HEIGHT,
PROP_SPREAD_ANGLE
};
#define DEFAULT_ANGLE 0
#define DEFAULT_HEIGHT 20
#define DEFAULT_SPREAD_ANGLE G_PI
#define gst_circle_parent_class parent_class
G_DEFINE_TYPE (GstCircle, gst_circle, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (circle, "circle", GST_RANK_NONE,
GST_TYPE_CIRCLE, GST_DEBUG_CATEGORY_INIT (gst_circle_debug, "circle", 0,
"circle"));
static void
gst_circle_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstCircle *circle;
GstGeometricTransform *gt;
gdouble v;
gint h;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
circle = GST_CIRCLE_CAST (object);
GST_OBJECT_LOCK (circle);
switch (prop_id) {
case PROP_ANGLE:
v = g_value_get_double (value);
if (v != circle->angle) {
circle->angle = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_SPREAD_ANGLE:
v = g_value_get_double (value);
if (v != circle->spread_angle) {
circle->spread_angle = v;
gst_geometric_transform_set_need_remap (gt);
}
break;
case PROP_HEIGHT:
h = g_value_get_int (value);
if (h != circle->height) {
circle->height = h;
gst_geometric_transform_set_need_remap (gt);
}
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (circle);
}
static void
gst_circle_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstCircle *circle;
circle = GST_CIRCLE_CAST (object);
switch (prop_id) {
case PROP_ANGLE:
g_value_set_double (value, circle->angle);
break;
case PROP_SPREAD_ANGLE:
g_value_set_double (value, circle->spread_angle);
break;
case PROP_HEIGHT:
g_value_set_int (value, circle->height);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
circle_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
GstCircle *circle = GST_CIRCLE_CAST (gt);
gdouble distance;
gdouble dx, dy;
gdouble theta;
dx = x - cgt->precalc_x_center;
dy = y - cgt->precalc_y_center;
distance = sqrt (dx * dx + dy * dy);
theta = atan2 (-dy, -dx) + circle->angle;
theta = gst_gm_mod_float (theta, 2 * G_PI);
*in_x = gt->width * theta / (circle->spread_angle + 0.0001);
*in_y =
gt->height * (1 - (distance - cgt->precalc_radius) / (circle->height +
0.0001));
GST_DEBUG_OBJECT (circle, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}
static void
gst_circle_class_init (GstCircleClass * 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,
"circle",
"Transform/Effect/Video",
"Warps the picture into an arc shaped form",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
gobject_class->set_property = gst_circle_set_property;
gobject_class->get_property = gst_circle_get_property;
g_object_class_install_property (gobject_class, PROP_ANGLE,
g_param_spec_double ("angle", "angle",
"Angle at which the arc starts in radians",
-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SPREAD_ANGLE,
g_param_spec_double ("spread-angle", "spread angle",
"Length of the arc in radians",
-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_SPREAD_ANGLE,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_HEIGHT,
g_param_spec_int ("height", "height",
"Height of the arc",
0, G_MAXINT, DEFAULT_HEIGHT,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = circle_map;
}
static void
gst_circle_init (GstCircle * filter)
{
filter->angle = DEFAULT_ANGLE;
filter->spread_angle = DEFAULT_SPREAD_ANGLE;
filter->height = DEFAULT_HEIGHT;
}