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-pinch
52 * @title: pinch
53 * @see_also: geometrictransform
54 *
55 * Pinch applies a 'pinch' geometric transform to the image.
56 *
57 * ## Example launch line
58 * |[
59 * gst-launch-1.0 -v videotestsrc ! pinch ! videoconvert ! autovideosink
60 * ]|
61 *
62 */
63
64 #ifdef HAVE_CONFIG_H
65 # include <config.h>
66 #endif
67
68 #include <gst/gst.h>
69 #include <math.h>
70
71 #include "gstpinch.h"
72
73 GST_DEBUG_CATEGORY_STATIC (gst_pinch_debug);
74 #define GST_CAT_DEFAULT gst_pinch_debug
75
76 enum
77 {
78 PROP_0,
79 PROP_INTENSITY
80 };
81
82 #define DEFAULT_INTENSITY 0.5
83
84 #define gst_pinch_parent_class parent_class
85 G_DEFINE_TYPE (GstPinch, gst_pinch, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
86
87 static void
gst_pinch_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)88 gst_pinch_set_property (GObject * object, guint prop_id, const GValue * value,
89 GParamSpec * pspec)
90 {
91 GstPinch *pinch;
92 GstGeometricTransform *gt;
93 gdouble v;
94
95 gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
96 pinch = GST_PINCH_CAST (object);
97
98 GST_OBJECT_LOCK (gt);
99 switch (prop_id) {
100 case PROP_INTENSITY:
101 v = g_value_get_double (value);
102 if (v != pinch->intensity) {
103 pinch->intensity = v;
104 gst_geometric_transform_set_need_remap (gt);
105 }
106 break;
107 default:
108 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
109 break;
110 }
111 GST_OBJECT_UNLOCK (gt);
112 }
113
114 static void
gst_pinch_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)115 gst_pinch_get_property (GObject * object, guint prop_id,
116 GValue * value, GParamSpec * pspec)
117 {
118 GstPinch *pinch;
119
120 pinch = GST_PINCH_CAST (object);
121
122 switch (prop_id) {
123 case PROP_INTENSITY:
124 g_value_set_double (value, pinch->intensity);
125 break;
126 default:
127 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
128 break;
129 }
130 }
131
132 static gboolean
pinch_map(GstGeometricTransform * gt,gint x,gint y,gdouble * in_x,gdouble * in_y)133 pinch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
134 gdouble * in_y)
135 {
136 GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
137 GstPinch *pinch = GST_PINCH_CAST (gt);
138 gdouble distance;
139 gdouble dx, dy;
140
141 dx = x - cgt->precalc_x_center;
142 dy = y - cgt->precalc_y_center;
143 distance = dx * dx + dy * dy;
144
145 GST_LOG_OBJECT (pinch, "Center %0.5lf (%0.2lf) %0.5lf (%0.2lf)",
146 cgt->precalc_x_center, cgt->x_center, cgt->precalc_y_center,
147 cgt->y_center);
148 GST_LOG_OBJECT (pinch, "Input %d %d, distance=%lf, radius2=%lf, dx=%lf"
149 ", dy=%lf", x, y, distance, cgt->precalc_radius2, dx, dy);
150
151 if (distance > cgt->precalc_radius2 || distance == 0) {
152 *in_x = x;
153 *in_y = y;
154 } else {
155 gdouble d = sqrt (distance / cgt->precalc_radius2);
156 gdouble t = pow (sin (G_PI * 0.5 * d), -pinch->intensity);
157
158 dx *= t;
159 dy *= t;
160
161 GST_LOG_OBJECT (pinch, "D=%lf, t=%lf, dx=%lf" ", dy=%lf", d, t, dx, dy);
162
163 *in_x = cgt->precalc_x_center + dx;
164 *in_y = cgt->precalc_y_center + dy;
165 }
166
167 GST_DEBUG_OBJECT (pinch, "Inversely mapped %d %d into %lf %lf",
168 x, y, *in_x, *in_y);
169
170 return TRUE;
171 }
172
173 static void
gst_pinch_class_init(GstPinchClass * klass)174 gst_pinch_class_init (GstPinchClass * klass)
175 {
176 GObjectClass *gobject_class;
177 GstElementClass *gstelement_class;
178 GstGeometricTransformClass *gstgt_class;
179
180 gobject_class = (GObjectClass *) klass;
181 gstelement_class = (GstElementClass *) klass;
182 gstgt_class = (GstGeometricTransformClass *) klass;
183
184 gst_element_class_set_static_metadata (gstelement_class,
185 "pinch",
186 "Transform/Effect/Video",
187 "Applies 'pinch' geometric transform to the image",
188 "Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
189
190 gobject_class->set_property = gst_pinch_set_property;
191 gobject_class->get_property = gst_pinch_get_property;
192
193 g_object_class_install_property (gobject_class, PROP_INTENSITY,
194 g_param_spec_double ("intensity", "intensity",
195 "intensity of the pinch effect",
196 -1.0, 1.0, DEFAULT_INTENSITY,
197 GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
198
199 gstgt_class->map_func = pinch_map;
200 }
201
202 static void
gst_pinch_init(GstPinch * filter)203 gst_pinch_init (GstPinch * filter)
204 {
205 GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
206
207 gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
208 filter->intensity = DEFAULT_INTENSITY;
209 }
210
211 gboolean
gst_pinch_plugin_init(GstPlugin * plugin)212 gst_pinch_plugin_init (GstPlugin * plugin)
213 {
214 GST_DEBUG_CATEGORY_INIT (gst_pinch_debug, "pinch", 0, "pinch");
215
216 return gst_element_register (plugin, "pinch", GST_RANK_NONE, GST_TYPE_PINCH);
217 }
218