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227 lines
6.7 KiB
C
227 lines
6.7 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Alternatively, the contents of this file may be used under the
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* GNU Lesser General Public License Version 2.1 (the "LGPL"), in
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* which case the following provisions apply instead of the ones
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* mentioned above:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java
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* image editor and filters. The algorithms here were extracted from
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* his code.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <gst/gst.h>
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#include <math.h>
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#include "gstsphere.h"
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GST_DEBUG_CATEGORY_STATIC (gst_sphere_debug);
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#define GST_CAT_DEFAULT gst_sphere_debug
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enum
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{
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PROP_0,
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PROP_REFRACTION
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};
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#define DEFAULT_REFRACTION 1.5
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#define gst_sphere_parent_class parent_class
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G_DEFINE_TYPE (GstSphere, gst_sphere, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
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static void
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gst_sphere_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstSphere *sphere;
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GstGeometricTransform *gt;
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gdouble v;
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gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
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sphere = GST_SPHERE_CAST (object);
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GST_OBJECT_LOCK (gt);
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switch (prop_id) {
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case PROP_REFRACTION:
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v = g_value_get_double (value);
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if (v != sphere->refraction) {
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sphere->refraction = v;
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gst_geometric_transform_set_need_remap (gt);
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}
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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GST_OBJECT_UNLOCK (gt);
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}
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static void
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gst_sphere_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstSphere *sphere;
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sphere = GST_SPHERE_CAST (object);
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switch (prop_id) {
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case PROP_REFRACTION:
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g_value_set_double (value, sphere->refraction);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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/* Clean up */
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static void
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gst_sphere_finalize (GObject * obj)
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{
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G_OBJECT_CLASS (parent_class)->finalize (obj);
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}
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/* TODO we could have horizontal and vertical 'radius' */
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static gboolean
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sphere_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x,
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gdouble * in_y)
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{
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GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt);
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GstSphere *sphere = GST_SPHERE_CAST (gt);
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gdouble dx, dy;
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gdouble dx2, dy2;
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dx = x - cgt->precalc_x_center;
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dy = y - cgt->precalc_y_center;
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dx2 = dx * dx;
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dy2 = dy * dy;
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if (dy2 >=
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(cgt->precalc_radius2 -
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(cgt->precalc_radius2 * dx2) / cgt->precalc_radius2)) {
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*in_x = x;
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*in_y = y;
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} else {
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gdouble r_refraction = 1.0 / sphere->refraction;
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gdouble z;
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gdouble z2;
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gdouble angle;
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gdouble angle1;
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gdouble angle2;
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z = sqrt ((1.0 - dx2 / cgt->precalc_radius2 -
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dy2 / cgt->precalc_radius2) * (cgt->precalc_radius2));
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z2 = z * z;
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/* x */
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angle = acos (dx / sqrt (dx2 + z2));
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angle1 = G_PI / 2 - angle;
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angle2 = asin (sin (angle1) * r_refraction);
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angle2 = G_PI / 2 - angle - angle2;
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*in_x = x - tan (angle2) * z;
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/* y */
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angle = acos (dy / sqrt (dy2 + z2));
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angle1 = G_PI / 2 - angle;
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angle2 = asin (sin (angle1) * r_refraction);
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angle2 = G_PI / 2 - angle - angle2;
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*in_y = y - tan (angle2) * z;
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}
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GST_DEBUG_OBJECT (sphere, "Inversely mapped %d %d into %lf %lf",
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x, y, *in_x, *in_y);
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return TRUE;
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}
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static void
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gst_sphere_class_init (GstSphereClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstGeometricTransformClass *gstgt_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstgt_class = (GstGeometricTransformClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gst_element_class_set_details_simple (gstelement_class,
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"sphere",
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"Transform/Effect/Video",
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"Applies 'sphere' geometric transform to the image",
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"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_sphere_finalize);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_sphere_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_sphere_get_property);
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g_object_class_install_property (gobject_class, PROP_REFRACTION,
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g_param_spec_double ("refraction", "refraction",
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"refraction index",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_REFRACTION,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = sphere_map;
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}
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static void
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gst_sphere_init (GstSphere * filter)
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{
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GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter);
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gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP;
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filter->refraction = DEFAULT_REFRACTION;
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}
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gboolean
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gst_sphere_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (gst_sphere_debug, "sphere", 0, "sphere");
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return gst_element_register (plugin, "sphere", GST_RANK_NONE,
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GST_TYPE_SPHERE);
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}
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