2 * filter_vignette.c -- vignette filter
3 * Copyright (c) 2007 Marco Gittler <g.marco@freenet.de>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <framework/mlt_filter.h>
21 #include <framework/mlt_frame.h>
22 #include <framework/mlt_geometry.h>
27 #define MIN(a,b) (a<b?a:b)
28 #define MAX(a,b) (a<b?b:a)
30 #define SIGMOD_STEPS 1000
31 #define POSITION_VALUE(p,s,e) (s+((double)(e-s)*p ))
32 //static double pow2[SIGMOD_STEPS];
33 static float geometry_to_float(char *val, mlt_position pos )
36 struct mlt_geometry_item_s item;
38 mlt_geometry geom=mlt_geometry_init();
39 mlt_geometry_parse(geom,val,-1,-1,-1);
40 mlt_geometry_fetch(geom,&item , pos );
42 mlt_geometry_close(geom);
47 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
50 mlt_filter filter = mlt_frame_pop_service( this );
51 *format = mlt_image_yuv422;
52 int error = mlt_frame_get_image( this, image, format, width, height, 1 );
54 if ( error == 0 && *image )
56 mlt_position in = mlt_filter_get_in( filter );
57 //mlt_position out = mlt_filter_get_out( filter );
58 mlt_position time = mlt_frame_get_position( this );
60 float smooth, radius, cx, cy, opac;
61 mlt_position pos = time - in;
62 mlt_properties filter_props = MLT_FILTER_PROPERTIES( filter ) ;
63 smooth = geometry_to_float ( mlt_properties_get( filter_props , "smooth" ) , pos ) * 100.0 ;
64 radius = geometry_to_float ( mlt_properties_get( filter_props , "radius" ) , pos ) * *width;
65 cx = geometry_to_float ( mlt_properties_get( filter_props , "x" ) , pos ) * *width;
66 cy = geometry_to_float ( mlt_properties_get( filter_props , "y" ) , pos ) * *height;
67 opac = geometry_to_float ( mlt_properties_get( filter_props , "opacity" ) , pos );
68 int video_width = *width;
69 int video_height = *height;
76 for (y=0;y<video_height;y++){
77 int h2_pow2=pow(y-h2,2.0);
78 for (x=0;x<video_width;x++){
79 uint8_t *pix=(*image+y*video_width*2+x*2);
80 int dx=sqrt(h2_pow2+pow(x-w2,2.0));
82 if (radius-smooth>dx){ //center, make not darker
85 else if (radius+smooth<=dx){//max dark after smooth area
88 //double sigx=5.0-10.0*(double)(dx-radius+smooth)/(2.0*smooth);//smooth >10 inner area, <-10 in dark area
89 //delta=pow2[((int)((sigx+10.0)*SIGMOD_STEPS/20.0))];//sigmoidal
90 delta = ((double)(radius+smooth-dx)/(2.0*smooth));//linear
92 delta=MAX(max_opac,delta);
93 *pix=(double)(*pix)*delta;
94 *(pix+1)=((double)(*(pix+1)-127.0)*delta)+127.0;
97 // short a, short b, short c, short d
99 // b: +=blue, -=yellow
107 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
110 mlt_frame_push_service( frame, this );
111 mlt_frame_push_get_image( frame, filter_get_image );
116 mlt_filter filter_vignette_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
118 mlt_filter this = mlt_filter_new( );
123 for (i=-SIGMOD_STEPS/2;i<SIGMOD_STEPS/2;i++){
124 pow2[i+SIGMOD_STEPS/2]=1.0/(1.0+pow(2.0,-((double)i)/((double)SIGMOD_STEPS/20.0)));
128 this->process = filter_process;
129 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "smooth", "0.8" );
130 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "radius", "0.5" );
131 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "x", "0.5" );
132 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "y", "0.5" );
133 mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "opacity", "0.0" );
135 //mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "end", "" );