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 "filter_mirror.h"
23 #include <framework/mlt_frame.h>
32 static int filter_get_image( mlt_frame frame
, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
34 // Pop the mirror filter from the stack
35 mlt_filter
this = mlt_frame_pop_service( frame
);
37 // Get the mirror type
38 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
41 char *mirror
= mlt_properties_get( properties
, "mirror" );
43 // Determine if reverse is required
44 int reverse
= mlt_properties_get_int( properties
, "reverse" );
47 int error
= mlt_frame_get_image( frame
, image
, format
, width
, height
, 1 );
50 uint8_t *alpha
= mlt_frame_get_alpha_mask( frame
);
52 // If we have an image of the right colour space
53 if ( error
== 0 && *format
== mlt_image_yuv422
)
58 if ( !strcmp( mirror
, "horizontal" ) )
65 int uneven_w
= ( *width
% 2 ) * 2;
66 for ( i
= 0; i
< *height
; i
++ )
68 p
= ( uint8_t * )*image
+ i
* *width
* 2;
70 a
= alpha
+ i
* *width
;
77 *p
++ = *( q
- 3 - uneven_w
);
79 *p
++ = *( q
- 1 - uneven_w
);
90 *( q
- 3 - uneven_w
) = *p
++;
92 *( q
- 1 - uneven_w
) = *p
++;
100 else if ( !strcmp( mirror
, "vertical" ) )
102 uint16_t *end
= ( uint16_t *)*image
+ *width
* *height
;
109 for ( i
= 0; i
< hh
; i
++ )
111 p
= ( uint16_t * )*image
+ i
* *width
;
112 q
= end
- ( i
+ 1 ) * *width
;
114 a
= alpha
+ i
* *width
;
115 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
134 else if ( !strcmp( mirror
, "diagonal" ) )
136 uint8_t *end
= ( uint8_t *)*image
+ *width
* *height
* 2;
143 int uneven_w
= ( *width
% 2 ) * 2;
144 for ( i
= 0; i
< *height
; i
++ )
146 p
= ( uint8_t * )*image
+ i
* *width
* 2;
147 q
= end
- i
* *width
* 2;
148 j
= ( ( *width
* ( *height
- i
) ) / *height
) / 2;
149 a
= alpha
+ i
* *width
;
150 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
156 *p
++ = *( q
- 3 - uneven_w
);
158 *p
++ = *( q
- 1 - uneven_w
);
169 *( q
- 3 - uneven_w
) = *p
++;
171 *( q
- 1 - uneven_w
) = *p
++;
179 else if ( !strcmp( mirror
, "xdiagonal" ) )
181 uint8_t *end
= ( uint8_t *)*image
+ *width
* *height
* 2;
188 int uneven_w
= ( *width
% 2 ) * 2;
189 for ( i
= 0; i
< *height
; i
++ )
191 p
= ( uint8_t * )*image
+ ( i
+ 1 ) * *width
* 2;
192 q
= end
- ( i
+ 1 ) * *width
* 2;
193 j
= ( ( *width
* ( *height
- i
) ) / *height
) / 2;
194 a
= alpha
+ ( i
+ 1 ) * *width
- 1;
195 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
201 *q
++ = *( p
- 3 - uneven_w
);
203 *q
++ = *( p
- 1 - uneven_w
);
214 *( p
- 3 - uneven_w
) = *q
++;
216 *( p
- 1 - uneven_w
) = *q
++;
224 else if ( !strcmp( mirror
, "flip" ) )
233 int uneven_w
= ( *width
% 2 ) * 2;
234 for ( i
= 0; i
< *height
; i
++ )
236 p
= ( uint8_t * )*image
+ i
* *width
* 2;
238 a
= alpha
+ i
* *width
;
243 t
[ 1 ] = p
[ 1 + uneven_w
];
245 t
[ 3 ] = p
[ 3 + uneven_w
];
247 *p
++ = *( q
- 3 - uneven_w
);
249 *p
++ = *( q
- 1 - uneven_w
);
263 else if ( !strcmp( mirror
, "flop" ) )
265 uint16_t *end
= ( uint16_t *)*image
+ *width
* *height
;
274 for ( i
= 0; i
< hh
; i
++ )
276 p
= ( uint16_t * )*image
+ i
* *width
;
277 q
= end
- ( i
+ 1 ) * *width
;
278 a
= alpha
+ i
* *width
;
279 b
= alpha
+ ( *height
- i
- 1 ) * *width
;
298 /** Filter processing.
301 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
303 // Push the service on to the stack
304 mlt_frame_push_service( frame
, this );
306 // Push the filter method on to the stack
307 mlt_frame_push_service( frame
, filter_get_image
);
312 /** Constructor for the filter.
315 mlt_filter
filter_mirror_init( void *arg
)
317 // Construct a new filter
318 mlt_filter
this = mlt_filter_new( );
320 // If we have a filter, initialise it
323 // Get the properties
324 mlt_properties properties
= MLT_FILTER_PROPERTIES( this );
326 // Set the default mirror type
327 mlt_properties_set_or_default( properties
, "mirror", arg
, "horizontal" );
329 // Assign the process method
330 this->process
= filter_process
;