2 * filter_mirror.c -- mirror filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #include <framework/mlt_filter.h>
22 #include <framework/mlt_frame.h>
31 static int filter_get_image( mlt_frame frame
, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
33 // Pop the mirror filter from the stack
34 mlt_filter
this = mlt_frame_pop_service( frame
);
36 // Get the mirror type
37 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
40 char *mirror
= mlt_properties_get( properties
, "mirror" );
42 // Determine if reverse is required
43 int reverse
= mlt_properties_get_int( properties
, "reverse" );
46 int error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 1 );
49 uint8_t *alpha
= mlt_frame_get_alpha_mask( frame
);
51 // If we have an image of the right colour space
52 if ( error
== 0 && *format
== mlt_image_yuv422
)
57 if ( !strcmp( mirror
, "horizontal" ) )
64 int uneven_w
= ( *width
% 2 ) * 2;
65 for ( i
= 0; i
< *height
; i
++ )
67 p
= ( uint8_t * )*image
+ i
* *width
* 2;
69 a
= alpha
+ i
* *width
;
76 *p
++ = *( q
- 3 - uneven_w
);
78 *p
++ = *( q
- 1 - uneven_w
);
89 *( q
- 3 - uneven_w
) = *p
++;
91 *( q
- 1 - uneven_w
) = *p
++;
99 else if ( !strcmp( mirror
, "vertical" ) )
101 uint16_t *end
= ( uint16_t *)*image
+ *width
* *height
;
108 for ( i
= 0; i
< hh
; i
++ )
110 p
= ( uint16_t * )*image
+ i
* *width
;
111 q
= end
- ( i
+ 1 ) * *width
;
113 a
= alpha
+ i
* *width
;
114 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
133 else if ( !strcmp( mirror
, "diagonal" ) )
135 uint8_t *end
= ( uint8_t *)*image
+ *width
* *height
* 2;
142 int uneven_w
= ( *width
% 2 ) * 2;
143 for ( i
= 0; i
< *height
; i
++ )
145 p
= ( uint8_t * )*image
+ i
* *width
* 2;
146 q
= end
- i
* *width
* 2;
147 j
= ( ( *width
* ( *height
- i
) ) / *height
) / 2;
148 a
= alpha
+ i
* *width
;
149 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
155 *p
++ = *( q
- 3 - uneven_w
);
157 *p
++ = *( q
- 1 - uneven_w
);
168 *( q
- 3 - uneven_w
) = *p
++;
170 *( q
- 1 - uneven_w
) = *p
++;
178 else if ( !strcmp( mirror
, "xdiagonal" ) )
180 uint8_t *end
= ( uint8_t *)*image
+ *width
* *height
* 2;
187 int uneven_w
= ( *width
% 2 ) * 2;
188 for ( i
= 0; i
< *height
; i
++ )
190 p
= ( uint8_t * )*image
+ ( i
+ 1 ) * *width
* 2;
191 q
= end
- ( i
+ 1 ) * *width
* 2;
192 j
= ( ( *width
* ( *height
- i
) ) / *height
) / 2;
193 a
= alpha
+ ( i
+ 1 ) * *width
- 1;
194 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
200 *q
++ = *( p
- 3 - uneven_w
);
202 *q
++ = *( p
- 1 - uneven_w
);
213 *( p
- 3 - uneven_w
) = *q
++;
215 *( p
- 1 - uneven_w
) = *q
++;
223 else if ( !strcmp( mirror
, "flip" ) )
232 int uneven_w
= ( *width
% 2 ) * 2;
233 for ( i
= 0; i
< *height
; i
++ )
235 p
= ( uint8_t * )*image
+ i
* *width
* 2;
237 a
= alpha
+ i
* *width
;
242 t
[ 1 ] = p
[ 1 + uneven_w
];
244 t
[ 3 ] = p
[ 3 + uneven_w
];
246 *p
++ = *( q
- 3 - uneven_w
);
248 *p
++ = *( q
- 1 - uneven_w
);
262 else if ( !strcmp( mirror
, "flop" ) )
264 uint16_t *end
= ( uint16_t *)*image
+ *width
* *height
;
273 for ( i
= 0; i
< hh
; i
++ )
275 p
= ( uint16_t * )*image
+ i
* *width
;
276 q
= end
- ( i
+ 1 ) * *width
;
277 a
= alpha
+ i
* *width
;
278 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
297 /** Filter processing.
300 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
302 // Push the service on to the stack
303 mlt_frame_push_service( frame
, this );
305 // Push the filter method on to the stack
306 mlt_frame_push_service( frame
, filter_get_image
);
311 /** Constructor for the filter.
314 mlt_filter
filter_mirror_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
316 // Construct a new filter
317 mlt_filter
this = mlt_filter_new( );
319 // If we have a filter, initialise it
322 // Get the properties
323 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
325 // Set the default mirror type
326 mlt_properties_set_or_default( properties
, "mirror", arg
, "horizontal" );
328 // Assign the process method
329 this->process
= filter_process
;