3 * Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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
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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.
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
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.
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.
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.
45 * SECTION:element-bulge
47 * @see_also: geometrictransform
49 * Bugle is a geometric image transform element. It adds a protuberance in the
52 * ## Example launch line
54 * gst-launch-1.0 -v videotestsrc ! bulge ! videoconvert ! autovideosink
67 #include "geometricmath.h"
69 GST_DEBUG_CATEGORY_STATIC (gst_bulge_debug);
70 #define GST_CAT_DEFAULT gst_bulge_debug
78 #define DEFAULT_ZOOM 3.0
80 #define gst_bulge_parent_class parent_class
81 G_DEFINE_TYPE (GstBulge, gst_bulge, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
84 gst_bulge_set_property (GObject * object, guint prop_id, const GValue * value,
88 GstGeometricTransform *gt;
91 gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
92 bulge = GST_BULGE_CAST (object);
97 v = g_value_get_double (value);
98 if (v != bulge->zoom) {
100 gst_geometric_transform_set_need_remap (gt);
104 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
107 GST_OBJECT_UNLOCK (gt);
111 gst_bulge_get_property (GObject * object, guint prop_id,
112 GValue * value, GParamSpec * pspec)
116 bulge = GST_BULGE_CAST (object);
120 g_value_set_double (value, bulge->zoom);
123 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
129 bulge_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
132 GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
133 GstBulge *bulge = GST_BULGE_CAST (gt);
135 gdouble norm_x, norm_y;
139 gdouble width = gt->width;
140 gdouble height = gt->height;
142 /* normalize in ((-1.0, -1.0), (1.0, 1.0) and traslate the center */
143 norm_x = 2.0 * (x / width - cgt->x_center);
144 norm_y = 2.0 * (y / height - cgt->y_center);
146 /* calculate radius, normalize to 1 for future convenience */
147 r = sqrt (0.5 * (norm_x * norm_x + norm_y * norm_y));
149 /* zoom in the center region and smoothly get back to no zoom while
152 /* the scale factor goes from bulge->zoom when r == 0 to 1.0
153 * when r == cgt->radius using Hermite interpolation */
154 /* scale is inverted because we're doing an inverse transform so
155 * zoom is achieved dividing */
158 1.0 / (bulge->zoom + ((1.0 - bulge->zoom) * gst_gm_smoothstep (0,
165 *in_x = (0.5 * norm_x + cgt->x_center) * width;
166 *in_y = (0.5 * norm_y + cgt->y_center) * height;
168 GST_DEBUG_OBJECT (bulge, "Inversely mapped %d %d into %lf %lf",
175 gst_bulge_class_init (GstBulgeClass * klass)
177 GObjectClass *gobject_class;
178 GstElementClass *gstelement_class;
179 GstGeometricTransformClass *gstgt_class;
181 gobject_class = (GObjectClass *) klass;
182 gstelement_class = (GstElementClass *) klass;
183 gstgt_class = (GstGeometricTransformClass *) klass;
185 gst_element_class_set_static_metadata (gstelement_class,
187 "Transform/Effect/Video",
188 "Adds a protuberance in the center point",
189 "Filippo Argiolas <filippo.argiolas@gmail.com>");
191 gobject_class->set_property = gst_bulge_set_property;
192 gobject_class->get_property = gst_bulge_get_property;
194 g_object_class_install_property (gobject_class, PROP_ZOOM,
195 g_param_spec_double ("zoom", "zoom",
196 "Zoom of the bulge effect",
197 1.0, 100.0, DEFAULT_ZOOM,
198 GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
200 gstgt_class->map_func = bulge_map;
204 gst_bulge_init (GstBulge * filter)
206 GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
208 filter->zoom = DEFAULT_ZOOM;
209 gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
213 gst_bulge_plugin_init (GstPlugin * plugin)
215 GST_DEBUG_CATEGORY_INIT (gst_bulge_debug, "bulge", 0, "bulge");
217 return gst_element_register (plugin, "bulge", GST_RANK_NONE, GST_TYPE_BULGE);