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238 lines
7.2 KiB
C
238 lines
7.2 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 "geometricmath.h"
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#include "gstcircle.h"
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GST_DEBUG_CATEGORY_STATIC (gst_circle_debug);
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#define GST_CAT_DEFAULT gst_circle_debug
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enum
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{
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PROP_0,
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PROP_ANGLE,
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PROP_HEIGHT,
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PROP_SPREAD_ANGLE
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};
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#define DEFAULT_ANGLE 0
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#define DEFAULT_HEIGHT 20
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#define DEFAULT_SPREAD_ANGLE G_PI
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#define gst_circle_parent_class parent_class
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G_DEFINE_TYPE (GstCircle, gst_circle, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM);
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static void
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gst_circle_set_property (GObject * object, guint prop_id, const GValue * value,
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GParamSpec * pspec)
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{
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GstCircle *circle;
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GstGeometricTransform *gt;
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gdouble v;
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gint h;
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gt = GST_GEOMETRIC_TRANSFORM_CAST (object);
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circle = GST_CIRCLE_CAST (object);
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GST_OBJECT_LOCK (circle);
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switch (prop_id) {
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case PROP_ANGLE:
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v = g_value_get_double (value);
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if (v != circle->angle) {
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circle->angle = 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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case PROP_SPREAD_ANGLE:
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v = g_value_get_double (value);
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if (v != circle->spread_angle) {
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circle->spread_angle = 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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case PROP_HEIGHT:
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h = g_value_get_int (value);
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if (h != circle->height) {
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circle->height = h;
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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 (circle);
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}
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static void
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gst_circle_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstCircle *circle;
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circle = GST_CIRCLE_CAST (object);
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switch (prop_id) {
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case PROP_ANGLE:
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g_value_set_double (value, circle->angle);
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break;
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case PROP_SPREAD_ANGLE:
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g_value_set_double (value, circle->spread_angle);
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break;
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case PROP_HEIGHT:
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g_value_set_int (value, circle->height);
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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_circle_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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static gboolean
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circle_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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GstCircle *circle = GST_CIRCLE_CAST (gt);
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gdouble distance;
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gdouble dx, dy;
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gdouble theta;
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dx = x - cgt->precalc_x_center;
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dy = y - cgt->precalc_y_center;
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distance = sqrt (dx * dx + dy * dy);
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theta = atan2 (-dy, -dx) + circle->angle;
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theta = mod_float (theta, 2 * G_PI);
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*in_x = gt->width * theta / (circle->spread_angle + 0.0001);
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*in_y =
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gt->height * (1 - (distance - cgt->precalc_radius) / (circle->height +
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0.0001));
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GST_DEBUG_OBJECT (circle, "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_circle_class_init (GstCircleClass * 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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"circle",
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"Transform/Effect/Video",
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"Warps the picture into an arc shaped form",
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"Thiago Santos<thiago.sousa.santos@collabora.co.uk>");
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_circle_finalize);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_circle_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_circle_get_property);
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g_object_class_install_property (gobject_class, PROP_ANGLE,
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g_param_spec_double ("angle", "angle",
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"Angle at which the arc starts in radians",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_SPREAD_ANGLE,
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g_param_spec_double ("spread-angle", "spread angle",
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"Length of the arc in radians",
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-G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_SPREAD_ANGLE,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_HEIGHT,
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g_param_spec_int ("height", "height",
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"Height of the arc",
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0, G_MAXINT, DEFAULT_HEIGHT,
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GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gstgt_class->map_func = circle_map;
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}
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static void
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gst_circle_init (GstCircle * filter)
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{
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filter->angle = DEFAULT_ANGLE;
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filter->spread_angle = DEFAULT_SPREAD_ANGLE;
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filter->height = DEFAULT_HEIGHT;
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}
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gboolean
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gst_circle_plugin_init (GstPlugin * plugin)
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{
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GST_DEBUG_CATEGORY_INIT (gst_circle_debug, "circle", 0, "circle");
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return gst_element_register (plugin, "circle", GST_RANK_NONE,
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GST_TYPE_CIRCLE);
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}
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