git.sesse.net Git - mlt/blob - src/modules/core/filter_mirror.c

   1 /*
   2  * filter_mirror.c -- mirror filter
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "filter_mirror.h"
  22
  23 #include <framework/mlt_frame.h>
  24
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 /** Do it :-).
  30 */
  31
  32 static int filter_get_image( mlt_frame frame, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
  33 {
  34         // Pop the mirror filter from the stack
  35         mlt_filter this = mlt_frame_pop_service( frame );
  36
  37         // Get the mirror type
  38         mlt_properties properties = MLT_FILTER_PROPERTIES( this );
  39
  40         // Get the properties
  41         char *mirror = mlt_properties_get( properties, "mirror" );
  42
  43         // Determine if reverse is required
  44         int reverse = mlt_properties_get_int( properties, "reverse" );
  45
  46         // Get the image
  47         int error = mlt_frame_get_image( frame, image, format, width, height, 1 );
  48
  49         // Get the alpha
  50         uint8_t *alpha = mlt_frame_get_alpha_mask( frame );
  51
  52         // If we have an image of the right colour space
  53         if ( error == 0 && *format == mlt_image_yuv422 )
  54         {
  55                 // We'll KISS here
  56                 int hh = *height / 2;
  57
  58                 if ( !strcmp( mirror, "horizontal" ) )
  59                 {
  60                         uint8_t *p = NULL;
  61                         uint8_t *q = NULL;
  62                         uint8_t *a = NULL;
  63                         uint8_t *b = NULL;
  64                         int i;
  65                         for ( i = 0; i < *height; i ++ )
  66                         {
  67                                 p = ( uint8_t * )*image + i * *width * 2;
  68                                 q = p + *width * 2;
  69                                 a = alpha + i * *width;
  70                                 b = a + *width - 1;
  71                                 if ( !reverse )
  72                                 {
  73                                         while ( p < q )
  74                                         {
  75                                                 *p ++ = *( q - 2 );
  76                                                 *p ++ = *( q - 3 );
  77                                                 *p ++ = *( q - 4 );
  78                                                 *p ++ = *( q - 1 );
  79                                                 q -= 4;
  80                                                 *a ++ = *b --;
  81                                                 *a ++ = *b --;
  82                                         }
  83                                 }
  84                                 else
  85                                 {
  86                                         while ( p < q )
  87                                         {
  88                                                 *( q - 2 ) = *p ++;
  89                                                 *( q - 3 ) = *p ++;
  90                                                 *( q - 4 ) = *p ++;
  91                                                 *( q - 1 ) = *p ++;
  92                                                 q -= 4;
  93                                                 *b -- = *a ++;
  94                                                 *b -- = *a ++;
  95                                         }
  96                                 }
  97                         }
  98                 }
  99                 else if ( !strcmp( mirror, "vertical" ) )
 100                 {
 101                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 102                         uint16_t *p = NULL;
 103                         uint16_t *q = NULL;
 104                         uint8_t *a = NULL;
 105                         uint8_t *b = NULL;
 106                         int i;
 107                         int j;
 108                         for ( i = 0; i < hh; i ++ )
 109                         {
 110                                 p = ( uint16_t * )*image + i * *width;
 111                                 q = end - ( i + 1 ) * *width;
 112                                 j = *width;
 113                                 a = alpha + i * *width;
 114                                 b = alpha + ( *height - i - 1 ) * *width;
 115                                 if ( !reverse )
 116                                 {
 117                                         while ( j -- )
 118                                         {
 119                                                 *p ++ = *q ++;
 120                                                 *a ++ = *b ++;
 121                                         }
 122                                 }
 123                                 else
 124                                 {
 125                                         while ( j -- )
 126                                         {
 127                                                 *q ++ = *p ++;
 128                                                 *b ++ = *a ++;
 129                                         }
 130                                 }
 131                         }
 132                 }
 133                 else if ( !strcmp( mirror, "diagonal" ) )
 134                 {
 135                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 136                         uint8_t *p = NULL;
 137                         uint8_t *q = NULL;
 138                         uint8_t *a = NULL;
 139                         uint8_t *b = NULL;
 140                         int i;
 141                         int j;
 142                         for ( i = 0; i < *height; i ++ )
 143                         {
 144                                 p = ( uint8_t * )*image + i * *width * 2;
 145                                 q = end - i * *width * 2;
 146                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 147                                 a = alpha + i * *width;
 148                                 b = alpha + ( *height - i - 1 ) * *width;
 149                                 if ( !reverse )
 150                                 {
 151                                         while ( j -- )
 152                                         {
 153                                                 *p ++ = *( q - 2 );
 154                                                 *p ++ = *( q - 3 );
 155                                                 *p ++ = *( q - 4 );
 156                                                 *p ++ = *( q - 1 );
 157                                                 q -= 4;
 158                                                 *a ++ = *b --;
 159                                                 *a ++ = *b --;
 160                                         }
 161                                 }
 162                                 else
 163                                 {
 164                                         while ( j -- )
 165                                         {
 166                                                 *( q - 2 ) = *p ++;
 167                                                 *( q - 3 ) = *p ++;
 168                                                 *( q - 4 ) = *p ++;
 169                                                 *( q - 1 ) = *p ++;
 170                                                 q -= 4;
 171                                                 *b -- = *a ++;
 172                                                 *b -- = *a ++;
 173                                         }
 174                                 }
 175                         }
 176                 }
 177                 else if ( !strcmp( mirror, "xdiagonal" ) )
 178                 {
 179                         uint8_t *end = ( uint8_t *)*image + *width * *height * 2;
 180                         uint8_t *p = NULL;
 181                         uint8_t *q = NULL;
 182                         int i;
 183                         int j;
 184                         uint8_t *a = NULL;
 185                         uint8_t *b = NULL;
 186                         for ( i = 0; i < *height; i ++ )
 187                         {
 188                                 p = ( uint8_t * )*image + ( i + 1 ) * *width * 2;
 189                                 q = end - ( i + 1 ) * *width * 2;
 190                                 j = ( ( *width * ( *height - i ) ) / *height ) / 2;
 191                                 a = alpha + ( i + 1 ) * *width - 1;
 192                                 b = alpha + ( *height - i - 1 ) * *width;
 193                                 if ( !reverse )
 194                                 {
 195                                         while ( j -- )
 196                                         {
 197                                                 *q ++ = *( p - 2 );
 198                                                 *q ++ = *( p - 3 );
 199                                                 *q ++ = *( p - 4 );
 200                                                 *q ++ = *( p - 1 );
 201                                                 p -= 4;
 202                                                 *b ++ = *a --;
 203                                                 *b ++ = *a --;
 204                                         }
 205                                 }
 206                                 else
 207                                 {
 208                                         while ( j -- )
 209                                         {
 210                                                 *( p - 2 ) = *q ++;
 211                                                 *( p - 3 ) = *q ++;
 212                                                 *( p - 4 ) = *q ++;
 213                                                 *( p - 1 ) = *q ++;
 214                                                 p -= 4;
 215                                                 *a -- = *b ++;
 216                                                 *a -- = *b ++;
 217                                         }
 218                                 }
 219                         }
 220                 }
 221                 else if ( !strcmp( mirror, "flip" ) )
 222                 {
 223                         uint8_t t[ 4 ];
 224                         uint8_t *p = NULL;
 225                         uint8_t *q = NULL;
 226                         int i;
 227                         uint8_t *a = NULL;
 228                         uint8_t *b = NULL;
 229                         uint8_t c;
 230                         for ( i = 0; i < *height; i ++ )
 231                         {
 232                                 p = ( uint8_t * )*image + i * *width * 2;
 233                                 q = p + *width * 2;
 234                                 a = alpha + i * *width;
 235                                 b = a + *width - 1;
 236                                 while ( p < q )
 237                                 {
 238                                         t[ 0 ] = p[ 0 ];
 239                                         t[ 1 ] = p[ 1 ];
 240                                         t[ 2 ] = p[ 2 ];
 241                                         t[ 3 ] = p[ 3 ];
 242                                         *p ++ = *( q - 2 );
 243                                         *p ++ = *( q - 3 );
 244                                         *p ++ = *( q - 4 );
 245                                         *p ++ = *( q - 1 );
 246                                         *( -- q ) = t[ 3 ];
 247                                         *( -- q ) = t[ 0 ];
 248                                         *( -- q ) = t[ 1 ];
 249                                         *( -- q ) = t[ 2 ];
 250                                         c = *a;
 251                                         *a ++ = *b;
 252                                         *b -- = c;
 253                                         c = *a;
 254                                         *a ++ = *b;
 255                                         *b -- = c;
 256                                 }
 257                         }
 258                 }
 259                 else if ( !strcmp( mirror, "flop" ) )
 260                 {
 261                         uint16_t *end = ( uint16_t *)*image + *width * *height;
 262                         uint16_t *p = NULL;
 263                         uint16_t *q = NULL;
 264                         uint16_t t;
 265                         uint8_t *a = NULL;
 266                         uint8_t *b = NULL;
 267                         uint8_t c;
 268                         int i;
 269                         int j;
 270                         for ( i = 0; i < hh; i ++ )
 271                         {
 272                                 p = ( uint16_t * )*image + i * *width;
 273                                 q = end - ( i + 1 ) * *width;
 274                                 a = alpha + i * *width;
 275                                 b = alpha + ( *height - i - 1 ) * *width;
 276                                 j = *width;
 277                                 while ( j -- )
 278                                 {
 279                                         t = *p;
 280                                         *p ++ = *q;
 281                                         *q ++ = t;
 282                                         c = *a;
 283                                         *a ++ = *b;
 284                                         *b ++ = c;
 285                                 }
 286                         }
 287                 }
 288         }
 289
 290         // Return the error
 291         return error;
 292 }
 293
 294 /** Filter processing.
 295 */
 296
 297 static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
 298 {
 299         // Push the service on to the stack
 300         mlt_frame_push_service( frame, this );
 301
 302         // Push the filter method on to the stack
 303         mlt_frame_push_service( frame, filter_get_image );
 304
 305         return frame;
 306 }
 307
 308 /** Constructor for the filter.
 309 */
 310
 311 mlt_filter filter_mirror_init( void *arg )
 312 {
 313         // Construct a new filter
 314         mlt_filter this = mlt_filter_new( );
 315
 316         // If we have a filter, initialise it
 317         if ( this != NULL )
 318         {
 319                 // Get the properties
 320                 mlt_properties properties = MLT_FILTER_PROPERTIES( this );
 321
 322                 // Set the default mirror type
 323                 mlt_properties_set_or_default( properties, "mirror", arg, "horizontal" );
 324
 325                 // Assign the process method
 326                 this->process = filter_process;
 327         }
 328
 329         // Return the filter
 330         return this;
 331 }
 332