| /* |
| * 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., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, 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. |
| */ |
| |
| |
| #ifdef HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #include <gst/gst.h> |
| #include <math.h> |
| |
| #include "geometricmath.h" |
| #include "gstrotate.h" |
| |
| GST_DEBUG_CATEGORY_STATIC (gst_rotate_debug); |
| #define GST_CAT_DEFAULT gst_rotate_debug |
| |
| enum |
| { |
| PROP_0, |
| PROP_ANGLE |
| }; |
| |
| #define DEFAULT_ANGLE 0 |
| |
| #define gst_rotate_parent_class parent_class |
| G_DEFINE_TYPE (GstRotate, gst_rotate, GST_TYPE_GEOMETRIC_TRANSFORM); |
| |
| static void |
| gst_rotate_set_property (GObject * object, guint prop_id, const GValue * value, |
| GParamSpec * pspec) |
| { |
| GstRotate *rotate; |
| GstGeometricTransform *gt; |
| gdouble v; |
| |
| gt = GST_GEOMETRIC_TRANSFORM_CAST (object); |
| rotate = GST_ROTATE_CAST (object); |
| |
| GST_OBJECT_LOCK (rotate); |
| switch (prop_id) { |
| case PROP_ANGLE: |
| v = g_value_get_double (value); |
| if (v != rotate->angle) { |
| rotate->angle = v; |
| gst_geometric_transform_set_need_remap (gt); |
| } |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| GST_OBJECT_UNLOCK (rotate); |
| } |
| |
| static void |
| gst_rotate_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec) |
| { |
| GstRotate *rotate; |
| |
| rotate = GST_ROTATE_CAST (object); |
| |
| switch (prop_id) { |
| case PROP_ANGLE: |
| g_value_set_double (value, rotate->angle); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| /* Clean up */ |
| static void |
| gst_rotate_finalize (GObject * obj) |
| { |
| G_OBJECT_CLASS (parent_class)->finalize (obj); |
| } |
| |
| static gboolean |
| rotate_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, |
| gdouble * in_y) |
| { |
| GstRotate *rotate = GST_ROTATE_CAST (gt); |
| gint w, h; |
| gdouble cix, ciy, cox, coy; /* centers, in/out x/y */ |
| gdouble ai, ao, ar; /* angles, in/out/rotate (radians) */ |
| gdouble r; /* radius */ |
| gdouble xi, yi, xo, yo; /* positions in/out x/y */ |
| |
| /* input and output image height and width */ |
| w = gt->width; |
| h = gt->height; |
| |
| /* our parameters */ |
| ar = rotate->angle; /* angle of rotation */ |
| |
| /* get in and out centers */ |
| cox = 0.5 * w; |
| coy = 0.5 * h; |
| cix = cox; |
| ciy = coy; |
| |
| /* convert output image position to polar form */ |
| xo = x - cox; |
| yo = y - coy; |
| ao = atan2 (yo, xo); |
| r = sqrt (xo * xo + yo * yo); |
| |
| /* perform rotation backward to get input image rotation |
| * this seems wrong, but rotation from in-->out is counterclockwise */ |
| ai = ao + ar; |
| |
| /* back to rectangular for input image position */ |
| xi = r * cos (ai); |
| yi = r * sin (ai); |
| |
| /* restore center offset, return values to caller */ |
| *in_x = xi + cix; |
| *in_y = yi + ciy; |
| |
| GST_DEBUG_OBJECT (rotate, "Inversely mapped %d %d into %lf %lf", |
| x, y, *in_x, *in_y); |
| |
| return TRUE; |
| } |
| |
| static void |
| gst_rotate_class_init (GstRotateClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *gstelement_class; |
| GstGeometricTransformClass *gstgt_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| gstelement_class = (GstElementClass *) klass; |
| gstgt_class = (GstGeometricTransformClass *) klass; |
| |
| parent_class = g_type_class_peek_parent (klass); |
| |
| gst_element_class_set_metadata (gstelement_class, |
| "rotate", |
| "Transform/Effect/Video", |
| "Rotates the picture by an arbitrary angle", |
| "Thiago Santos<thiago.sousa.santos@collabora.co.uk>"); |
| |
| gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_rotate_finalize); |
| gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_rotate_set_property); |
| gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_rotate_get_property); |
| |
| g_object_class_install_property (gobject_class, PROP_ANGLE, |
| g_param_spec_double ("angle", "angle", |
| "Angle at which the arc starts in radians", |
| -G_MAXDOUBLE, G_MAXDOUBLE, DEFAULT_ANGLE, |
| GST_PARAM_CONTROLLABLE | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| gstgt_class->map_func = rotate_map; |
| } |
| |
| static void |
| gst_rotate_init (GstRotate * filter) |
| { |
| filter->angle = DEFAULT_ANGLE; |
| } |
| |
| gboolean |
| gst_rotate_plugin_init (GstPlugin * plugin) |
| { |
| GST_DEBUG_CATEGORY_INIT (gst_rotate_debug, "rotate", 0, "rotate"); |
| |
| return gst_element_register (plugin, "rotate", GST_RANK_NONE, |
| GST_TYPE_ROTATE); |
| } |