/* * GStreamer * Copyright (C) 2010 Thiago Santos * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Thanks to Jerry Huxtable work on its java * image editor and filters. The algorithms here were extracted from * his code. */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include "gstsphere.h" GST_DEBUG_CATEGORY_STATIC (gst_sphere_debug); #define GST_CAT_DEFAULT gst_sphere_debug enum { PROP_0, PROP_REFRACTION }; #define DEFAULT_REFRACTION 1.5 GST_BOILERPLATE (GstSphere, gst_sphere, GstCircleGeometricTransform, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM); static void gst_sphere_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstSphere *sphere; sphere = GST_SPHERE_CAST (object); switch (prop_id) { case PROP_REFRACTION: sphere->refraction = g_value_get_double (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_sphere_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstSphere *sphere; sphere = GST_SPHERE_CAST (object); switch (prop_id) { case PROP_REFRACTION: g_value_set_double (value, sphere->refraction); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } /* Clean up */ static void gst_sphere_finalize (GObject * obj) { G_OBJECT_CLASS (parent_class)->finalize (obj); } /* GObject vmethod implementations */ static void gst_sphere_base_init (gpointer gclass) { GstElementClass *element_class = GST_ELEMENT_CLASS (gclass); gst_element_class_set_details_simple (element_class, "sphere", "Transform/Effect/Video", "Applies 'sphere' geometric transform to the image", "Thiago Santos"); } /* TODO we could have horizontal and vertical 'radius' */ static gboolean sphere_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt); GstSphere *sphere = GST_SPHERE_CAST (gt); gdouble dx, dy; gdouble dx2, dy2; dx = x - cgt->precalc_x_center; dy = y - cgt->precalc_y_center; dx2 = dx * dx; dy2 = dy * dy; if (dy2 >= (cgt->precalc_radius2 - (cgt->precalc_radius2 * dx2) / cgt->precalc_radius2)) { *in_x = x; *in_y = y; } else { gdouble r_refraction = 1.0 / sphere->refraction; gdouble z; gdouble z2; gdouble angle; gdouble angle1; gdouble angle2; z = sqrt ((1.0 - dx2 / cgt->precalc_radius2 - dy2 / cgt->precalc_radius2) * (cgt->precalc_radius2)); z2 = z * z; /* x */ angle = acos (dx / sqrt (dx2 + z2)); angle1 = G_PI / 2 - angle; angle2 = asin (sin (angle1) * r_refraction); angle2 = G_PI / 2 - angle - angle2; *in_x = x - tan (angle2) * z; /* y */ angle = acos (dy / sqrt (dy2 + z2)); angle1 = G_PI / 2 - angle; angle2 = asin (sin (angle1) * r_refraction); angle2 = G_PI / 2 - angle - angle2; *in_y = y - tan (angle2) * z; } GST_DEBUG_OBJECT (sphere, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_sphere_class_init (GstSphereClass * klass) { GObjectClass *gobject_class; GstGeometricTransformClass *gstgt_class; gobject_class = (GObjectClass *) klass; gstgt_class = (GstGeometricTransformClass *) klass; parent_class = g_type_class_peek_parent (klass); gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_sphere_finalize); gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_sphere_set_property); gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_sphere_get_property); g_object_class_install_property (gobject_class, PROP_REFRACTION, g_param_spec_double ("refraction", "refraction", "refraction index", -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_REFRACTION, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = sphere_map; } static void gst_sphere_init (GstSphere * filter, GstSphereClass * gclass) { GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; filter->refraction = DEFAULT_REFRACTION; } gboolean gst_sphere_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_sphere_debug, "sphere", 0, "sphere"); return gst_element_register (plugin, "sphere", GST_RANK_NONE, GST_TYPE_SPHERE); }