git.sesse.net Git - mlt/blob - src/modules/oldfilm/filter_vignette.c

   1 /*
   2  * filter_vignette.c -- vignette filter
   3  * Copyright (c) 2007 Marco Gittler <g.marco@freenet.de>
   4  *
   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.
   9  *
  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.
  14  *
  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
  18  */
  19
  20 #include <framework/mlt_filter.h>
  21 #include <framework/mlt_frame.h>
  22 #include <framework/mlt_geometry.h>
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27 #define MIN(a,b) (a<b?a:b)
  28 #define MAX(a,b) (a<b?b:a)
  29
  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 )
  34 {
  35     float ret=0.0;
  36     struct mlt_geometry_item_s item;
  37
  38         mlt_geometry geom=mlt_geometry_init();
  39     mlt_geometry_parse(geom,val,-1,-1,-1);
  40     mlt_geometry_fetch(geom,&item , pos );
  41     ret=item.x;
  42     mlt_geometry_close(geom);
  43
  44     return ret;
  45 }
  46
  47 static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  48 {
  49
  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 );
  53
  54         if ( error == 0 && *image )
  55         {
  56                 float smooth, radius, cx, cy, opac;
  57                 mlt_properties filter_props = MLT_FILTER_PROPERTIES( filter ) ;
  58                 mlt_position pos = mlt_filter_get_position( filter, this );
  59
  60                 smooth = geometry_to_float ( mlt_properties_get( filter_props , "smooth" ) , pos ) * 100.0 ;
  61                 radius = geometry_to_float ( mlt_properties_get( filter_props , "radius" ) , pos ) * *width;
  62                 cx = geometry_to_float ( mlt_properties_get( filter_props , "x" ) , pos ) * *width;
  63                 cy = geometry_to_float ( mlt_properties_get( filter_props , "y" ) , pos ) * *height;
  64                 opac = geometry_to_float ( mlt_properties_get( filter_props , "opacity" ) , pos );
  65                 int mode = mlt_properties_get_int( filter_props , "mode" );
  66
  67                 int video_width = *width;
  68                 int video_height = *height;
  69
  70                 int x,y;
  71                 int w2=cx,h2=cy;
  72                 double delta=1.0;
  73                 double max_opac=opac;
  74                 for (y=0;y<video_height;y++){
  75                         int h2_pow2=pow(y-h2,2.0);
  76                         for (x=0;x<video_width;x++){
  77                                 uint8_t *pix=(*image+y*video_width*2+x*2);
  78                                 int dx=sqrt(h2_pow2+pow(x-w2,2.0));
  79
  80                                 if (radius-smooth>dx){  //center, make not darker
  81                                         continue;
  82                                 }
  83                                 else if (radius+smooth<=dx){//max dark after smooth area
  84                                         delta=0.0;
  85                                 }else{
  86                                         // linear pos from of opacity (from 0 to 1)
  87                                         delta=(double)(radius+smooth-dx)/(2.0*smooth);
  88                                         if (mode==1){
  89                                                 //make cos for smoother non linear fade
  90                                                 delta = (double)pow(cos(((1.0-delta)*3.14159/2.0)),3.0);
  91                                         }
  92                                 }
  93                                 delta=MAX(max_opac,delta);
  94                                 *pix=(double)(*pix)*delta;
  95                                 *(pix+1)=((double)(*(pix+1)-127.0)*delta)+127.0;
  96                         }
  97                 }
  98         }
  99
 100         return error;
 101 }
 102
 103 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 104 {
 105         mlt_frame_push_service( frame, this );
 106         mlt_frame_push_get_image( frame, filter_get_image );
 107         return frame;
 108 }
 109
 110
 111 mlt_filter filter_vignette_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 112 {
 113         mlt_filter this = mlt_filter_new( );
 114         //int i=0;
 115         if ( this != NULL )
 116         {
 117                 /*
 118                 for (i=-SIGMOD_STEPS/2;i<SIGMOD_STEPS/2;i++){
 119                         pow2[i+SIGMOD_STEPS/2]=1.0/(1.0+pow(2.0,-((double)i)/((double)SIGMOD_STEPS/20.0)));
 120                 }
 121                 */
 122
 123                 this->process = filter_process;
 124                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "smooth", 0.8 );
 125                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "radius", 0.5 );
 126                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "x", 0.5 );
 127                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "y", 0.5 );
 128                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "opacity", 0.0 );
 129                 mlt_properties_set_double( MLT_FILTER_PROPERTIES( this ), "mode", 0 );
 130
 131                 //mlt_properties_set( MLT_FILTER_PROPERTIES( this ), "end", "" );
 132
 133         }
 134         return this;
 135 }
 136
 137