gstreamer/gst/geometrictransform/gstpinch.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-pinch
* @title: pinch
* @see_also: geometrictransform
*
* Pinch applies a 'pinch' geometric transform to the image.
*
* ## Example launch line
* |[
* gst-launch-1.0 -v videotestsrc ! pinch ! videoconvert ! autovideosink
* ]|
*
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <gst/gst.h>
#include <math.h>
#include "gstpinch.h"
GST_DEBUG_CATEGORY_STATIC (gst_pinch_debug);
#define GST_CAT_DEFAULT gst_pinch_debug
enum
{
PROP_0,
PROP_INTENSITY
};
#define DEFAULT_INTENSITY 0.5
#define gst_pinch_parent_class parent_class
G_DEFINE_TYPE (GstPinch, gst_pinch, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
static void
gst_pinch_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstPinch *pinch;
GstGeometricTransform *gt;
gdouble v;
gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
pinch = GST_PINCH_CAST (object);
GST_OBJECT_LOCK (gt);
switch (prop_id) {
case PROP_INTENSITY:
v = g_value_get_double (value);
if (v != pinch->intensity) {
pinch->intensity = 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_pinch_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstPinch *pinch;
pinch = GST_PINCH_CAST (object);
switch (prop_id) {
case PROP_INTENSITY:
g_value_set_double (value, pinch->intensity);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
pinch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
gdouble * in_y)
{
GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
GstPinch *pinch = GST_PINCH_CAST (gt);
gdouble distance;
gdouble dx, dy;
dx = x - cgt->precalc_x_center;
dy = y - cgt->precalc_y_center;
distance = dx * dx + dy * dy;
GST_LOG_OBJECT (pinch, "Center %0.5lf (%0.2lf) %0.5lf (%0.2lf)",
cgt->precalc_x_center, cgt->x_center, cgt->precalc_y_center,
cgt->y_center);
GST_LOG_OBJECT (pinch, "Input %d %d, distance=%lf, radius2=%lf, dx=%lf"
", dy=%lf", x, y, distance, cgt->precalc_radius2, dx, dy);
if (distance > cgt->precalc_radius2 || distance == 0) {
*in_x = x;
*in_y = y;
} else {
gdouble d = sqrt (distance / cgt->precalc_radius2);
gdouble t = pow (sin (G_PI * 0.5 * d), -pinch->intensity);
dx *= t;
dy *= t;
GST_LOG_OBJECT (pinch, "D=%lf, t=%lf, dx=%lf" ", dy=%lf", d, t, dx, dy);
*in_x = cgt->precalc_x_center + dx;
*in_y = cgt->precalc_y_center + dy;
}
GST_DEBUG_OBJECT (pinch, "Inversely mapped %d %d into %lf %lf",
x, y, *in_x, *in_y);
return TRUE;
}
static void
gst_pinch_class_init (GstPinchClass * 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,
"pinch",
"Transform/Effect/Video",
"Applies 'pinch' geometric transform to the image",
"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
gobject_class->set_property = gst_pinch_set_property;
gobject_class->get_property = gst_pinch_get_property;
g_object_class_install_property (gobject_class, PROP_INTENSITY,
g_param_spec_double ("intensity", "intensity",
"intensity of the pinch effect",
-1.0, 1.0, DEFAULT_INTENSITY,
GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstgt_class->map_func = pinch_map;
}
static void
gst_pinch_init (GstPinch * filter)
{
GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
filter->intensity = DEFAULT_INTENSITY;
}
gboolean
gst_pinch_plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (gst_pinch_debug, "pinch", 0, "pinch");
return gst_element_register (plugin, "pinch", GST_RANK_NONE, GST_TYPE_PINCH);
}