modules/video_filter/invert.c

   1 /*****************************************************************************
   2  * invert.c : Invert video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000-2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34
  35 #include <vlc_filter.h>
  36 #include "filter_picture.h"
  37
  38 /*****************************************************************************
  39  * Local prototypes
  40  *****************************************************************************/
  41 static int  Create      ( vlc_object_t * );
  42 static void Destroy     ( vlc_object_t * );
  43
  44 static picture_t *Filter( filter_t *, picture_t * );
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49 vlc_module_begin ()
  50     set_description( N_("Invert video filter") )
  51     set_shortname( N_("Color inversion" ))
  52     set_category( CAT_VIDEO )
  53     set_subcategory( SUBCAT_VIDEO_VFILTER )
  54     set_capability( "video filter2", 0 )
  55     add_shortcut( "invert" )
  56     set_callbacks( Create, Destroy )
  57 vlc_module_end ()
  58
  59 /*****************************************************************************
  60  * Create: allocates Invert video thread output method
  61  *****************************************************************************
  62  * This function allocates and initializes a Invert vout method.
  63  *****************************************************************************/
  64 static int Create( vlc_object_t *p_this )
  65 {
  66     filter_t *p_filter = (filter_t *)p_this;
  67
  68     p_filter->pf_video_filter = Filter;
  69
  70     return VLC_SUCCESS;
  71 }
  72
  73 /*****************************************************************************
  74  * Destroy: destroy Invert video thread output method
  75  *****************************************************************************
  76  * Terminate an output method created by InvertCreateOutputMethod
  77  *****************************************************************************/
  78 static void Destroy( vlc_object_t *p_this )
  79 {
  80     (void)p_this;
  81 }
  82
  83 /*****************************************************************************
  84  * Render: displays previously rendered output
  85  *****************************************************************************
  86  * This function send the currently rendered image to Invert image, waits
  87  * until it is displayed and switch the two rendering buffers, preparing next
  88  * frame.
  89  *****************************************************************************/
  90 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
  91 {
  92     picture_t *p_outpic;
  93     int i_index;
  94     int i_planes;
  95
  96     if( !p_pic ) return NULL;
  97
  98     p_outpic = filter_NewPicture( p_filter );
  99     if( !p_outpic )
 100     {
 101         msg_Warn( p_filter, "can't get output picture" );
 102         picture_Release( p_pic );
 103         return NULL;
 104     }
 105
 106     if( p_pic->format.i_chroma == VLC_CODEC_YUVA )
 107     {
 108         /* We don't want to invert the alpha plane */
 109         i_planes = p_pic->i_planes - 1;
 110         vlc_memcpy(
 111             p_outpic->p[A_PLANE].p_pixels, p_pic->p[A_PLANE].p_pixels,
 112             p_pic->p[A_PLANE].i_pitch *  p_pic->p[A_PLANE].i_lines );
 113     }
 114     else
 115     {
 116         i_planes = p_pic->i_planes;
 117     }
 118
 119     for( i_index = 0 ; i_index < i_planes ; i_index++ )
 120     {
 121         uint8_t *p_in, *p_in_end, *p_line_end, *p_out;
 122
 123         p_in = p_pic->p[i_index].p_pixels;
 124         p_in_end = p_in + p_pic->p[i_index].i_visible_lines
 125                            * p_pic->p[i_index].i_pitch;
 126
 127         p_out = p_outpic->p[i_index].p_pixels;
 128
 129         for( ; p_in < p_in_end ; )
 130         {
 131             uint64_t *p_in64, *p_out64;
 132
 133             p_line_end = p_in + p_pic->p[i_index].i_visible_pitch - 64;
 134
 135             p_in64 = (uint64_t*)p_in;
 136             p_out64 = (uint64_t*)p_out;
 137
 138             while( p_in64 < (uint64_t *)p_line_end )
 139             {
 140                 /* Do 64 pixels at a time */
 141                 *p_out64++ = ~*p_in64++; *p_out64++ = ~*p_in64++;
 142                 *p_out64++ = ~*p_in64++; *p_out64++ = ~*p_in64++;
 143                 *p_out64++ = ~*p_in64++; *p_out64++ = ~*p_in64++;
 144                 *p_out64++ = ~*p_in64++; *p_out64++ = ~*p_in64++;
 145             }
 146
 147             p_in = (uint8_t*)p_in64;
 148             p_out = (uint8_t*)p_out64;
 149             p_line_end += 64;
 150
 151             for( ; p_in < p_line_end ; )
 152             {
 153                 *p_out++ = ~( *p_in++ );
 154             }
 155
 156             p_in += p_pic->p[i_index].i_pitch
 157                      - p_pic->p[i_index].i_visible_pitch;
 158             p_out += p_outpic->p[i_index].i_pitch
 159                      - p_outpic->p[i_index].i_visible_pitch;
 160         }
 161     }
 162
 163     return CopyInfoAndRelease( p_outpic, p_pic );
 164 }