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249 lines
7.8 KiB
C
249 lines
7.8 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
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* image editor and filters. The algorithms here were extracted from
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* his code.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/gst.h>
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#include <math.h>
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#include "geometricmath.h"
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#include "gstkaleidoscope.h"
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GST_DEBUG_CATEGORY_STATIC (gst_kaleidoscope_debug);
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#define GST_CAT_DEFAULT gst_kaleidoscope_debug
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enum
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{
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PROP_0,
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PROP_ANGLE,
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PROP_ANGLE2,
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PROP_SIDES
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};
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#define DEFAULT_ANGLE 0
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#define DEFAULT_ANGLE2 0
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#define DEFAULT_SIDES 3
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#define gst_kaleidoscope_parent_class parent_class
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G_DEFINE_TYPE (GstKaleidoscope, gst_kaleidoscope,
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GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
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static void
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gst_kaleidoscope_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstKaleidoscope *kaleidoscope;
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GstGeometricTransform *gt;
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gdouble v;
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gint s;
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gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
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kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
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GST_OBJECT_LOCK (gt);
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switch (prop_id) {
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case PROP_ANGLE:
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v = g_value_get_double (value);
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if (v != kaleidoscope->angle) {
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kaleidoscope->angle = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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case PROP_ANGLE2:
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v = g_value_get_double (value);
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if (v != kaleidoscope->angle2) {
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kaleidoscope->angle2 = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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case PROP_SIDES:
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s = g_value_get_int (value);
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if (s != kaleidoscope->sides) {
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kaleidoscope->sides = s;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (gt);
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}
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static void
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gst_kaleidoscope_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstKaleidoscope *kaleidoscope;
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kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
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switch (prop_id) {
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case PROP_ANGLE:
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g_value_set_double (value, kaleidoscope->angle);
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break;
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case PROP_ANGLE2:
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g_value_set_double (value, kaleidoscope->angle2);
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break;
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case PROP_SIDES:
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g_value_set_int (value, kaleidoscope->sides);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* Clean up */
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static void
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gst_kaleidoscope_finalize (GObject * obj)
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{
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G_OBJECT_CLASS (parent_class)->finalize (obj);
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}
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static gboolean
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kaleidoscope_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
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gdouble * in_y)
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{
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GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
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GstKaleidoscope *kaleidoscope = GST_KALEIDOSCOPE_CAST (gt);
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gdouble dx, dy;
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gdouble distance;
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gdouble theta;
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dx = x - cgt->precalc_x_center;
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dy = y - cgt->precalc_y_center;
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distance = sqrt (dx * dx + dy * dy);
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theta = atan2 (dy, dx) - kaleidoscope->angle - kaleidoscope->angle2;
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theta = geometric_math_triangle (theta / G_PI * kaleidoscope->sides * 0.5);
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if (cgt->precalc_radius != 0) {
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gdouble radiusc = cgt->precalc_radius / cos (theta);
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distance = radiusc * geometric_math_triangle (distance / radiusc);
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}
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theta += kaleidoscope->angle;
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*in_x = cgt->precalc_x_center + distance * cos (theta);
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*in_y = cgt->precalc_y_center + distance * sin (theta);
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GST_DEBUG_OBJECT (kaleidoscope, "Inversely mapped %d %d into %lf %lf",
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x, y, *in_x, *in_y);
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return TRUE;
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}
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static void
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gst_kaleidoscope_class_init (GstKaleidoscopeClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstGeometricTransformClass *gstgt_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstgt_class = (GstGeometricTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gst_element_class_set_details_simple (gstelement_class,
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"kaleidoscope",
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"Transform/Effect/Video",
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"Applies 'kaleidoscope' geometric transform to the image",
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"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_kaleidoscope_finalize);
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gobject_class->set_property =
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GST_DEBUG_FUNCPTR (gst_kaleidoscope_set_property);
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gobject_class->get_property =
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GST_DEBUG_FUNCPTR (gst_kaleidoscope_get_property);
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g_object_class_install_property (gobject_class, PROP_ANGLE,
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g_param_spec_double ("angle", "angle",
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"primary angle in radians of the kaleidoscope effect",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_ANGLE2,
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g_param_spec_double ("angle2", "angle2",
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"secondary angle in radians of the kaleidoscope effect",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_SIDES,
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g_param_spec_int ("sides", "sides", "Number of sides of the kaleidoscope",
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2, G_MAXINT, DEFAULT_SIDES,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = kaleidoscope_map;
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}
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static void
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gst_kaleidoscope_init (GstKaleidoscope * filter)
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{
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GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
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gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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filter->angle = DEFAULT_ANGLE;
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filter->angle2 = DEFAULT_ANGLE2;
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filter->sides = DEFAULT_SIDES;
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}
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gboolean
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gst_kaleidoscope_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (gst_kaleidoscope_debug, "kaleidoscope", 0,
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"kaleidoscope");
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return gst_element_register (plugin, "kaleidoscope", GST_RANK_NONE,
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GST_TYPE_KALEIDOSCOPE);
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}
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