/* * 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-twirl * @title: twirl * @see_also: geometrictransform * * The twirl element twists the image from the center out. * * ## Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! twirl ! videoconvert ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <gst/gst.h> #include <math.h> #include "gsttwirl.h" GST_DEBUG_CATEGORY_STATIC (gst_twirl_debug); #define GST_CAT_DEFAULT gst_twirl_debug enum { PROP_0, PROP_ANGLE }; #define DEFAULT_ANGLE (G_PI) #define gst_twirl_parent_class parent_class G_DEFINE_TYPE (GstTwirl, gst_twirl, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM); static void gst_twirl_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstTwirl *twirl; GstGeometricTransform *gt; gdouble v; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); twirl = GST_TWIRL_CAST (object); GST_OBJECT_LOCK (gt); switch (prop_id) { case PROP_ANGLE: v = g_value_get_double (value); if (v != twirl->angle) { twirl->angle = 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_twirl_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstTwirl *twirl; twirl = GST_TWIRL_CAST (object); switch (prop_id) { case PROP_ANGLE: g_value_set_double (value, twirl->angle); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean twirl_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt); GstTwirl *twirl = GST_TWIRL_CAST (gt); gdouble distance; gdouble dx, dy; dx = x - cgt->precalc_x_center; dy = y - cgt->precalc_y_center; distance = dx * dx + dy * dy; if (distance > cgt->precalc_radius2) { *in_x = x; *in_y = y; } else { gdouble d = sqrt (distance); gdouble a = atan2 (dy, dx) + twirl->angle * (cgt->precalc_radius - d) / cgt->precalc_radius; *in_x = cgt->precalc_x_center + d * cos (a); *in_y = cgt->precalc_y_center + d * sin (a); } GST_DEBUG_OBJECT (twirl, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_twirl_class_init (GstTwirlClass * 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, "twirl", "Transform/Effect/Video", "Twists the image from the center out", "Thiago Santos<thiago.sousa.santos@collabora.co.uk>"); gobject_class->set_property = gst_twirl_set_property; gobject_class->get_property = gst_twirl_get_property; g_object_class_install_property (gobject_class, PROP_ANGLE, g_param_spec_double ("angle", "angle", "This is the angle in radians by which pixels at the " "nearest edge of the image will move", -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = twirl_map; } static void gst_twirl_init (GstTwirl * filter) { GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; filter->angle = DEFAULT_ANGLE; } gboolean gst_twirl_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_twirl_debug, "twirl", 0, "twirl"); return gst_element_register (plugin, "twirl", GST_RANK_NONE, GST_TYPE_TWIRL); }