2 * filter_invert.c -- invert 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>
29 static inline int clamp( int v
, int l
, int u
)
31 return v
< l ? l
: ( v
> u ? u
: v
);
37 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
40 mlt_filter filter
= mlt_frame_pop_service( this );
41 int mask
= mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter
), "alpha" );
42 int error
= mlt_frame_get_image( this, image
, format
, width
, height
, 1 );
44 // Only process if we have no error and a valid colour space
45 if ( error
== 0 && *format
== mlt_image_yuv422
)
48 uint8_t *q
= *image
+ *width
* *height
* 2;
53 *p
++ = clamp( 251 - *r
++, 16, 235 );
54 *p
++ = clamp( 256 - *r
++, 16, 240 );
59 uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
60 int size
= *width
* *height
;
61 memset( alpha
, mask
, size
);
68 /** Filter processing.
71 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
73 // Push the frame filter
74 mlt_frame_push_service( frame
, this );
75 mlt_frame_push_get_image( frame
, filter_get_image
);
79 /** Constructor for the filter.
82 mlt_filter
filter_invert_init( mlt_profile profile
, mlt_service_type type
, const char *id
, char *arg
)
84 mlt_filter
this = mlt_filter_new( );
86 this->process
= filter_process
;