/* * GStreamer * Copyright (C) 2010 Filippo Argiolas * * 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. */ /** * SECTION:element-bulge * @title: bulge * @see_also: geometrictransform * * Bugle is a geometric image transform element. It adds a protuberance in the * center point. * * ## Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! bulge ! videoconvert ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include #endif #include #include #include "gstbulge.h" #include "geometricmath.h" GST_DEBUG_CATEGORY_STATIC (gst_bulge_debug); #define GST_CAT_DEFAULT gst_bulge_debug enum { PROP_0, PROP_ZOOM }; #define DEFAULT_ZOOM 3.0 #define gst_bulge_parent_class parent_class G_DEFINE_TYPE (GstBulge, gst_bulge, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM); GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (bulge, "bulge", GST_RANK_NONE, GST_TYPE_BULGE, GST_DEBUG_CATEGORY_INIT (gst_bulge_debug, "bulge", 0, "bulge")); static void gst_bulge_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstBulge *bulge; GstGeometricTransform *gt; gdouble v; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); bulge = GST_BULGE_CAST (object); GST_OBJECT_LOCK (gt); switch (prop_id) { case PROP_ZOOM: v = g_value_get_double (value); if (v != bulge->zoom) { bulge->zoom = 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_bulge_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstBulge *bulge; bulge = GST_BULGE_CAST (object); switch (prop_id) { case PROP_ZOOM: g_value_set_double (value, bulge->zoom); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean bulge_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt); GstBulge *bulge = GST_BULGE_CAST (gt); gdouble norm_x, norm_y; gdouble r; gdouble scale; gdouble width = gt->width; gdouble height = gt->height; /* normalize in ((-1.0, -1.0), (1.0, 1.0) and translate the center */ norm_x = 2.0 * (x / width - cgt->x_center); norm_y = 2.0 * (y / height - cgt->y_center); /* calculate radius, normalize to 1 for future convenience */ r = sqrt (0.5 * (norm_x * norm_x + norm_y * norm_y)); /* zoom in the center region and smoothly get back to no zoom while * r increases */ /* the scale factor goes from bulge->zoom when r == 0 to 1.0 * when r == cgt->radius using Hermite interpolation */ /* scale is inverted because we're doing an inverse transform so * zoom is achieved dividing */ scale = 1.0 / (bulge->zoom + ((1.0 - bulge->zoom) * gst_gm_smoothstep (0, cgt->radius, r))); norm_x *= scale; norm_y *= scale; /* unnormalize */ *in_x = (0.5 * norm_x + cgt->x_center) * width; *in_y = (0.5 * norm_y + cgt->y_center) * height; GST_DEBUG_OBJECT (bulge, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_bulge_class_init (GstBulgeClass * 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, "bulge", "Transform/Effect/Video", "Adds a protuberance in the center point", "Filippo Argiolas "); gobject_class->set_property = gst_bulge_set_property; gobject_class->get_property = gst_bulge_get_property; g_object_class_install_property (gobject_class, PROP_ZOOM, g_param_spec_double ("zoom", "zoom", "Zoom of the bulge effect", 1.0, 100.0, DEFAULT_ZOOM, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = bulge_map; } static void gst_bulge_init (GstBulge * filter) { GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); filter->zoom = DEFAULT_ZOOM; gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; }