/* * GStreamer * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk> * * 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. */ /* * Thanks to Jerry Huxtable <http://www.jhlabs.com> work on its java * image editor and filters. The algorithms here were extracted from * his code. */ /** * SECTION:element-pinch * @title: pinch * @see_also: geometrictransform * * Pinch applies a 'pinch' geometric transform to the image. * * ## Example launch line * |[ * gst-launch-1.0 -v videotestsrc ! pinch ! videoconvert ! autovideosink * ]| * */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <gst/gst.h> #include <math.h> #include "gstpinch.h" GST_DEBUG_CATEGORY_STATIC (gst_pinch_debug); #define GST_CAT_DEFAULT gst_pinch_debug enum { PROP_0, PROP_INTENSITY }; #define DEFAULT_INTENSITY 0.5 #define gst_pinch_parent_class parent_class G_DEFINE_TYPE (GstPinch, gst_pinch, GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM); static void gst_pinch_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstPinch *pinch; GstGeometricTransform *gt; gdouble v; gt = GST_GEOMETRIC_TRANSFORM_CAST (object); pinch = GST_PINCH_CAST (object); GST_OBJECT_LOCK (gt); switch (prop_id) { case PROP_INTENSITY: v = g_value_get_double (value); if (v != pinch->intensity) { pinch->intensity = 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_pinch_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstPinch *pinch; pinch = GST_PINCH_CAST (object); switch (prop_id) { case PROP_INTENSITY: g_value_set_double (value, pinch->intensity); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean pinch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, gdouble * in_y) { GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt); GstPinch *pinch = GST_PINCH_CAST (gt); gdouble distance; gdouble dx, dy; dx = x - cgt->precalc_x_center; dy = y - cgt->precalc_y_center; distance = dx * dx + dy * dy; GST_LOG_OBJECT (pinch, "Center %0.5lf (%0.2lf) %0.5lf (%0.2lf)", cgt->precalc_x_center, cgt->x_center, cgt->precalc_y_center, cgt->y_center); GST_LOG_OBJECT (pinch, "Input %d %d, distance=%lf, radius2=%lf, dx=%lf" ", dy=%lf", x, y, distance, cgt->precalc_radius2, dx, dy); if (distance > cgt->precalc_radius2 || distance == 0) { *in_x = x; *in_y = y; } else { gdouble d = sqrt (distance / cgt->precalc_radius2); gdouble t = pow (sin (G_PI * 0.5 * d), -pinch->intensity); dx *= t; dy *= t; GST_LOG_OBJECT (pinch, "D=%lf, t=%lf, dx=%lf" ", dy=%lf", d, t, dx, dy); *in_x = cgt->precalc_x_center + dx; *in_y = cgt->precalc_y_center + dy; } GST_DEBUG_OBJECT (pinch, "Inversely mapped %d %d into %lf %lf", x, y, *in_x, *in_y); return TRUE; } static void gst_pinch_class_init (GstPinchClass * 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, "pinch", "Transform/Effect/Video", "Applies 'pinch' geometric transform to the image", "Thiago Santos<thiago.sousa.santos@collabora.co.uk>"); gobject_class->set_property = gst_pinch_set_property; gobject_class->get_property = gst_pinch_get_property; g_object_class_install_property (gobject_class, PROP_INTENSITY, g_param_spec_double ("intensity", "intensity", "intensity of the pinch effect", -1.0, 1.0, DEFAULT_INTENSITY, GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstgt_class->map_func = pinch_map; } static void gst_pinch_init (GstPinch * filter) { GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; filter->intensity = DEFAULT_INTENSITY; } gboolean gst_pinch_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_pinch_debug, "pinch", 0, "pinch"); return gst_element_register (plugin, "pinch", GST_RANK_NONE, GST_TYPE_PINCH); }