diff options
author | Filippo Argiolas <filippo.argiolas@gmail.com> | 2010-08-02 09:17:03 +0200 |
---|---|---|
committer | Sebastian Dröge <sebastian.droege@collabora.co.uk> | 2010-08-02 20:09:26 +0200 |
commit | 2edd185a9a3f03280d4184ddd5a81c20f52845f7 (patch) | |
tree | b624030016eb61d8014c50cd1d75f188e128d553 /gst/geometrictransform | |
parent | 8f47c060d759021425305235ae512be78759b8fd (diff) | |
download | gstreamer-plugins-bad-2edd185a9a3f03280d4184ddd5a81c20f52845f7.tar.gz |
geometrictransform: new filter "stretch"
Ports gleffects "stretch" filter to geometrictransform.
Shrinks the image around the center and gradually return to normal zoom
creating funny caricatures.
https://bugzilla.gnome.org/show_bug.cgi?id=625722
Diffstat (limited to 'gst/geometrictransform')
-rw-r--r-- | gst/geometrictransform/Makefile.am | 6 | ||||
-rw-r--r-- | gst/geometrictransform/geometricmath.c | 10 | ||||
-rw-r--r-- | gst/geometrictransform/geometricmath.h | 2 | ||||
-rw-r--r-- | gst/geometrictransform/gststretch.c | 158 | ||||
-rw-r--r-- | gst/geometrictransform/gststretch.h | 82 | ||||
-rw-r--r-- | gst/geometrictransform/plugin.c | 4 |
6 files changed, 260 insertions, 2 deletions
diff --git a/gst/geometrictransform/Makefile.am b/gst/geometrictransform/Makefile.am index b2c9ff7df..c6a8ac714 100644 --- a/gst/geometrictransform/Makefile.am +++ b/gst/geometrictransform/Makefile.am @@ -11,7 +11,8 @@ libgstgeometrictransform_la_SOURCES = plugin.c \ gstpinch.c \ gstsphere.c \ gsttwirl.c \ - gstwaterripple.c + gstwaterripple.c \ + gststretch.c libgstgeometrictransform_la_CFLAGS = $(GST_CFLAGS) $(GST_BASE_CFLAGS) \ $(GST_PLUGINS_BASE_CFLAGS) \ @@ -35,4 +36,5 @@ noinst_HEADERS = gstgeometrictransform.h \ gstpinch.h \ gstsphere.h \ gsttwirl.h \ - gstwaterripple.h + gstwaterripple.h \ + gststretch.h diff --git a/gst/geometrictransform/geometricmath.c b/gst/geometrictransform/geometricmath.c index dbdfe97bf..3185e101d 100644 --- a/gst/geometrictransform/geometricmath.c +++ b/gst/geometrictransform/geometricmath.c @@ -189,3 +189,13 @@ geometric_math_triangle (gdouble x) return 2.0 * (r < 0.5 ? r : 1 - r); } + +/** + * Hermite interpolation + */ +gdouble +smoothstep (gdouble edge0, gdouble edge1, gdouble x) +{ + gdouble t = CLAMP ((x - edge0) / (edge1 - edge0), 0.0, 1.0); + return t * t * (3.0 - 2.0 * t); +} diff --git a/gst/geometrictransform/geometricmath.h b/gst/geometrictransform/geometricmath.h index dfd58009b..36b164f1f 100644 --- a/gst/geometrictransform/geometricmath.h +++ b/gst/geometrictransform/geometricmath.h @@ -63,6 +63,8 @@ gdouble noise_2 (Noise * noise, gdouble x, gdouble y); gdouble mod_float (gdouble a, gdouble b); gdouble geometric_math_triangle (gdouble x); +gdouble smoothstep (gdouble edge0, gdouble edge1, gdouble x); + G_END_DECLS #endif /* __GEOMETRIC_MATH_H__ */ diff --git a/gst/geometrictransform/gststretch.c b/gst/geometrictransform/gststretch.c new file mode 100644 index 000000000..0e826c8a4 --- /dev/null +++ b/gst/geometrictransform/gststretch.c @@ -0,0 +1,158 @@ +/* + * GStreamer + * Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com> + * + * 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. + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <gst/gst.h> +#include <math.h> + +#include "gststretch.h" +#include "geometricmath.h" + +GST_DEBUG_CATEGORY_STATIC (gst_stretch_debug); +#define GST_CAT_DEFAULT gst_stretch_debug + +GST_BOILERPLATE (GstStretch, gst_stretch, GstCircleGeometricTransform, + GST_TYPE_CIRCLE_GEOMETRIC_TRANSFORM); + +/* Clean up */ +static void +gst_stretch_finalize (GObject * obj) +{ + G_OBJECT_CLASS (parent_class)->finalize (obj); +} + +/* GObject vmethod implementations */ + +static void +gst_stretch_base_init (gpointer gclass) +{ + GstElementClass *element_class = GST_ELEMENT_CLASS (gclass); + + gst_element_class_set_details_simple (element_class, + "stretch", + "Transform/Effect/Video", + "Stretch the image in a circle around the center point", + "Filippo Argiolas <filippo.argiolas@gmail.com>"); +} + +static gboolean +stretch_map (GstGeometricTransform * gt, gint x, gint y, gdouble * in_x, + gdouble * in_y) +{ + GstCircleGeometricTransform *cgt = GST_CIRCLE_GEOMETRIC_TRANSFORM_CAST (gt); + GstStretch *stretch = GST_STRETCH_CAST (gt); + + gdouble norm_x, norm_y; + gdouble r; + + gdouble width = gt->width; + gdouble height = gt->height; + + /* normalize in ((-1.0, -1.0), (1.0, 1.0) and traslate the center */ + norm_x = 2.0 * (x / width - cgt->x_center); + norm_y = 2.0 * (y / height - cgt->y_center); + + r = sqrt (norm_x * norm_x + norm_y * norm_y); + + /* TODO: make it customizable, 0.7 is the radius of the stretch + * ellipse, with current way of setting radius (absolute value) it + * would be sqrt(hw*hw + hh*hh)/radius*radius but currently I prefer + * leaving it hardcoded because I don't think absolute radius makes + * any sense: the user either knows the video size and can easily + * calculate the fractional radius and set that or doesn't know the + * size a priori and wants to obtain the same effect no matter of + * the video dimensions */ + + /* actually "stretch" name is a bit misleading, what the transform + * really does is shrink the center and gradually return to normal + * size while r increases. The shrink thing drags pixels giving + * stretching the image around the center */ + /* 2.0 is the shrink amount. Make it customizable? */ + norm_x *= 2.0 - smoothstep (0.0, 0.7, r); + norm_y *= 2.0 - smoothstep (0.0, 0.7, r); + + /* unnormalize */ + *in_x = (0.5 * norm_x + cgt->x_center) * width; + *in_y = (0.5 * norm_y + cgt->y_center) * height; + + GST_DEBUG_OBJECT (stretch, "Inversely mapped %d %d into %lf %lf", + x, y, *in_x, *in_y); + + return TRUE; +} + +static void +gst_stretch_class_init (GstStretchClass * klass) +{ + GObjectClass *gobject_class; + GstGeometricTransformClass *gstgt_class; + + gobject_class = (GObjectClass *) klass; + gstgt_class = (GstGeometricTransformClass *) klass; + + parent_class = g_type_class_peek_parent (klass); + + gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_stretch_finalize); + + gstgt_class->map_func = stretch_map; +} + +static void +gst_stretch_init (GstStretch * filter, GstStretchClass * gclass) +{ + GstGeometricTransform *gt = GST_GEOMETRIC_TRANSFORM (filter); + + gt->off_edge_pixels = GST_GT_OFF_EDGES_PIXELS_CLAMP; +} + +gboolean +gst_stretch_plugin_init (GstPlugin * plugin) +{ + GST_DEBUG_CATEGORY_INIT (gst_stretch_debug, "stretch", 0, "stretch"); + + return gst_element_register (plugin, "stretch", GST_RANK_NONE, + GST_TYPE_STRETCH); +} diff --git a/gst/geometrictransform/gststretch.h b/gst/geometrictransform/gststretch.h new file mode 100644 index 000000000..c23227472 --- /dev/null +++ b/gst/geometrictransform/gststretch.h @@ -0,0 +1,82 @@ +/* + * GStreamer + * Copyright (C) 2010 Filippo Argiolas <filippo.argiolas@gmail.com> + * + * 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. + */ + +#ifndef __GST_STRETCH_H__ +#define __GST_STRETCH_H__ + +#include <gst/gst.h> +#include "gstcirclegeometrictransform.h" + +G_BEGIN_DECLS +/* #defines don't like whitespacey bits */ +#define GST_TYPE_STRETCH \ + (gst_stretch_get_type()) +#define GST_STRETCH(obj) \ + (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_STRETCH,GstStretch)) +#define GST_STRETCH_CAST(obj) \ + ((GstStretch *)(obj)) +#define GST_STRETCH_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_STRETCH,GstStretchClass)) +#define GST_IS_STRETCH(obj) \ + (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_STRETCH)) +#define GST_IS_STRETCH_CLASS(klass) \ + (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_STRETCH)) +typedef struct _GstStretch GstStretch; +typedef struct _GstStretchClass GstStretchClass; + +struct _GstStretch +{ + GstCircleGeometricTransform element; +}; + +struct _GstStretchClass +{ + GstCircleGeometricTransformClass parent_class; +}; + +GType gst_stretch_get_type (void); + +gboolean gst_stretch_plugin_init (GstPlugin * plugin); + +G_END_DECLS +#endif /* __GST_STRETCH_H__ */ diff --git a/gst/geometrictransform/plugin.c b/gst/geometrictransform/plugin.c index 2f655dc58..e7af53e2e 100644 --- a/gst/geometrictransform/plugin.c +++ b/gst/geometrictransform/plugin.c @@ -29,6 +29,7 @@ #include "gstsphere.h" #include "gsttwirl.h" #include "gstwaterripple.h" +#include "gststretch.h" static gboolean plugin_init (GstPlugin * plugin) @@ -57,6 +58,9 @@ plugin_init (GstPlugin * plugin) if (!gst_water_ripple_plugin_init (plugin)) return FALSE; + if (!gst_stretch_plugin_init (plugin)) + return FALSE; + return TRUE; } |