1 /*
2 * GStreamer
3 * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Alternatively, the contents of this file may be used under the
24 * GNU Lesser General Public License Version 2.1 (the "LGPL"), in
25 * which case the following provisions apply instead of the ones
26 * mentioned above:
27 *
28 * This library is free software; you can redistribute it and/or
29 * modify it under the terms of the GNU Library General Public
30 * License as published by the Free Software Foundation; either
31 * version 2 of the License, or (at your option) any later version.
32 *
33 * This library is distributed in the hope that it will be useful,
34 * but WITHOUT ANY WARRANTY; without even the implied warranty of
35 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
36 * Library General Public License for more details.
37 *
38 * You should have received a copy of the GNU Library General Public
39 * License along with this library; if not, write to the
40 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
41 * Boston, MA 02110-1301, USA.
42 */
43
44 /*
45 * Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
46 * image editor and filters. The algorithms here were extracted from
47 * his code.
48 */
49
50 /**
51 * SECTION:element-kaleidoscope
52 * @title: kaleidoscope
53 * @see_also: geometrictransform
54 *
55 * The kaleidscope element applies 'kaleidoscope' geometric transform to the
56 * image.
57 *
58 * ## Example launch line
59 * |[
60 * gst-launch-1.0 -v videotestsrc ! kaleidoscope ! videoconvert ! autovideosink
61 * ]|
62 *
63 */
64
65 #ifdef HAVE_CONFIG_H
66 # include <config.h>
67 #endif
68
69 #include <gst/gst.h>
70 #include <math.h>
71
72 #include "geometricmath.h"
73 #include "gstkaleidoscope.h"
74
75 GST_DEBUG_CATEGORY_STATIC (gst_kaleidoscope_debug);
76 #define GST_CAT_DEFAULT gst_kaleidoscope_debug
77
78 enum
79 {
80 PROP_0,
81 PROP_ANGLE,
82 PROP_ANGLE2,
83 PROP_SIDES
84 };
85
86 #define DEFAULT_ANGLE 0
87 #define DEFAULT_ANGLE2 0
88 #define DEFAULT_SIDES 3
89
90 #define gst_kaleidoscope_parent_class parent_class
91 G_DEFINE_TYPE (GstKaleidoscope, gst_kaleidoscope,
92 GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
93
94 static void
gst_kaleidoscope_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)95 gst_kaleidoscope_set_property (GObject * object, guint prop_id,
96 const GValue * value, GParamSpec * pspec)
97 {
98 GstKaleidoscope *kaleidoscope;
99 GstGeometricTransform *gt;
100 gdouble v;
101 gint s;
102
103 gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
104 kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
105
106 GST_OBJECT_LOCK (gt);
107 switch (prop_id) {
108 case PROP_ANGLE:
109 v = g_value_get_double (value);
110 if (v != kaleidoscope->angle) {
111 kaleidoscope->angle = v;
112 gst_geometric_transform_set_need_remap (gt);
113 }
114 break;
115 case PROP_ANGLE2:
116 v = g_value_get_double (value);
117 if (v != kaleidoscope->angle2) {
118 kaleidoscope->angle2 = v;
119 gst_geometric_transform_set_need_remap (gt);
120 }
121 break;
122 case PROP_SIDES:
123 s = g_value_get_int (value);
124 if (s != kaleidoscope->sides) {
125 kaleidoscope->sides = s;
126 gst_geometric_transform_set_need_remap (gt);
127 }
128 break;
129 default:
130 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
131 break;
132 }
133 GST_OBJECT_UNLOCK (gt);
134 }
135
136 static void
gst_kaleidoscope_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)137 gst_kaleidoscope_get_property (GObject * object, guint prop_id,
138 GValue * value, GParamSpec * pspec)
139 {
140 GstKaleidoscope *kaleidoscope;
141
142 kaleidoscope = GST_KALEIDOSCOPE_CAST (object);
143
144 switch (prop_id) {
145 case PROP_ANGLE:
146 g_value_set_double (value, kaleidoscope->angle);
147 break;
148 case PROP_ANGLE2:
149 g_value_set_double (value, kaleidoscope->angle2);
150 break;
151 case PROP_SIDES:
152 g_value_set_int (value, kaleidoscope->sides);
153 break;
154 default:
155 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
156 break;
157 }
158 }
159
160 static gboolean
kaleidoscope_map(GstGeometricTransform * gt,gint x,gint y,gdouble * in_x,gdouble * in_y)161 kaleidoscope_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
162 gdouble * in_y)
163 {
164 GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
165 GstKaleidoscope *kaleidoscope = GST_KALEIDOSCOPE_CAST (gt);
166 gdouble dx, dy;
167 gdouble distance;
168 gdouble theta;
169
170 dx = x - cgt->precalc_x_center;
171 dy = y - cgt->precalc_y_center;
172 distance = sqrt (dx * dx + dy * dy);
173 theta = atan2 (dy, dx) - kaleidoscope->angle - kaleidoscope->angle2;
174
175 theta = gst_gm_triangle (theta / G_PI * kaleidoscope->sides * 0.5);
176
177 if (cgt->precalc_radius != 0) {
178 gdouble radiusc = cgt->precalc_radius / cos (theta);
179
180 distance = radiusc * gst_gm_triangle (distance / radiusc);
181 }
182 theta += kaleidoscope->angle;
183
184 *in_x = cgt->precalc_x_center + distance * cos (theta);
185 *in_y = cgt->precalc_y_center + distance * sin (theta);
186
187 GST_DEBUG_OBJECT (kaleidoscope, "Inversely mapped %d %d into %lf %lf",
188 x, y, *in_x, *in_y);
189
190 return TRUE;
191 }
192
193 static void
gst_kaleidoscope_class_init(GstKaleidoscopeClass * klass)194 gst_kaleidoscope_class_init (GstKaleidoscopeClass * klass)
195 {
196 GObjectClass *gobject_class;
197 GstElementClass *gstelement_class;
198 GstGeometricTransformClass *gstgt_class;
199
200 gobject_class = (GObjectClass *) klass;
201 gstelement_class = (GstElementClass *) klass;
202 gstgt_class = (GstGeometricTransformClass *) klass;
203
204 gst_element_class_set_static_metadata (gstelement_class,
205 "kaleidoscope",
206 "Transform/Effect/Video",
207 "Applies 'kaleidoscope' geometric transform to the image",
208 "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
209
210 gobject_class->set_property = gst_kaleidoscope_set_property;
211 gobject_class->get_property = gst_kaleidoscope_get_property;
212
213 g_object_class_install_property (gobject_class, PROP_ANGLE,
214 g_param_spec_double ("angle", "angle",
215 "primary angle in radians of the kaleidoscope effect",
216 -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
217 GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
218 g_object_class_install_property (gobject_class, PROP_ANGLE2,
219 g_param_spec_double ("angle2", "angle2",
220 "secondary angle in radians of the kaleidoscope effect",
221 -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
222 GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
223 g_object_class_install_property (gobject_class, PROP_SIDES,
224 g_param_spec_int ("sides", "sides", "Number of sides of the kaleidoscope",
225 2, G_MAXINT, DEFAULT_SIDES,
226 GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
227
228 gstgt_class->map_func = kaleidoscope_map;
229 }
230
231 static void
gst_kaleidoscope_init(GstKaleidoscope * filter)232 gst_kaleidoscope_init (GstKaleidoscope * filter)
233 {
234 GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
235
236 gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
237 filter->angle = DEFAULT_ANGLE;
238 filter->angle2 = DEFAULT_ANGLE2;
239 filter->sides = DEFAULT_SIDES;
240 }
241
242 gboolean
gst_kaleidoscope_plugin_init(GstPlugin * plugin)243 gst_kaleidoscope_plugin_init (GstPlugin * plugin)
244 {
245 GST_DEBUG_CATEGORY_INIT (gst_kaleidoscope_debug, "kaleidoscope", 0,
246 "kaleidoscope");
247
248 return gst_element_register (plugin, "kaleidoscope", GST_RANK_NONE,
249 GST_TYPE_KALEIDOSCOPE);
250 }
251