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140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/*
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* GStreamer
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* Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com>
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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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-tunnel
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* @title: tunnel
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* @see_also: geometrictransform
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*
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* Tunnel is a geometric image transform element. It applies a light tunnel
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* effect.
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*
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* ## Example launch line
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* |[
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* gst-launch-1.0 -v videotestsrc ! tunnel ! videoconvert ! autovideosink
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* ]|
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*
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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 "gsttunnel.h"
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#include "geometricmath.h"
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GST_DEBUG_CATEGORY_STATIC (gst_tunnel_debug);
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#define GST_CAT_DEFAULT gst_tunnel_debug
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#define gst_tunnel_parent_class parent_class
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G_DEFINE_TYPE (GstTunnel, gst_tunnel, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (tunnel, "tunnel", GST_RANK_NONE,
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GST_TYPE_TUNNEL, GST_DEBUG_CATEGORY_INIT (gst_tunnel_debug, "tunnel", 0,
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"tunnel"));
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static gboolean
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tunnel_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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#ifndef GST_DISABLE_GST_DEBUG
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GstTunnel *tunnel = GST_TUNNEL_CAST (gt);
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#endif
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gdouble norm_x, norm_y;
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gdouble width = gt->width;
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gdouble height = gt->height;
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gdouble r;
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/* normalize in ((-1.0, -1.0), (1.0, 1.0) and translate the center */
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/* plus a little trick to obtain a perfect circle, normalize in a
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* square with sides equal to MAX(width, height) */
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norm_x = 2.0 * (x - cgt->x_center * width) / MAX (width, height);
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norm_y = 2.0 * (y - cgt->y_center * height) / MAX (width, height);
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/* calculate radius, normalize to 1 for future convenience */
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r = sqrt (0.5 * (norm_x * norm_x + norm_y * norm_y));
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/* do nothing if r < radius */
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/* zoom otherwise */
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norm_x *= CLAMP (r, 0.0, cgt->radius) / r;
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norm_y *= CLAMP (r, 0.0, cgt->radius) / r;
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/* unnormalize */
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*in_x = 0.5 * (norm_x) * MAX (width, height) + cgt->x_center * width;
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*in_y = 0.5 * (norm_y) * MAX (width, height) + cgt->y_center * height;
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GST_DEBUG_OBJECT (tunnel, "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_tunnel_class_init (GstTunnelClass * klass)
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{
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GstElementClass *gstelement_class;
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GstGeometricTransformClass *gstgt_class;
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gstelement_class = (GstElementClass *) klass;
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gstgt_class = (GstGeometricTransformClass *) klass;
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gst_element_class_set_static_metadata (gstelement_class,
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"tunnel",
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"Transform/Effect/Video",
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"Light tunnel effect", "Filippo Argiolas <filippo.argiolas@gmail.com>");
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gstgt_class->map_func = tunnel_map;
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}
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static void
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gst_tunnel_init (GstTunnel * 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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}
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