2 * filter_invert.c -- invert filter
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
21 #include "filter_invert.h"
23 #include <framework/mlt_frame.h>
30 static inline int clamp( int v
, int l
, int u
)
32 return v
< l ? l
: ( v
> u ? u
: v
);
38 static int filter_get_image( mlt_frame
this, uint8_t **image
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
41 mlt_filter filter
= mlt_frame_pop_service( this );
42 int mask
= mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter
), "alpha" );
43 int error
= mlt_frame_get_image( this, image
, format
, width
, height
, 1 );
45 // Only process if we have no error and a valid colour space
46 if ( error
== 0 && *format
== mlt_image_yuv422
)
49 uint8_t *q
= *image
+ *width
* *height
* 2;
54 *p
++ = clamp( 251 - *r
++, 16, 235 );
55 *p
++ = clamp( 256 - *r
++, 16, 240 );
60 uint8_t *alpha
= mlt_frame_get_alpha_mask( this );
61 int size
= *width
* *height
;
62 memset( alpha
, mask
, size
);
69 /** Filter processing.
72 static mlt_frame
filter_process( mlt_filter
this, mlt_frame frame
)
74 // Push the frame filter
75 mlt_frame_push_service( frame
, this );
76 mlt_frame_push_get_image( frame
, filter_get_image
);
80 /** Constructor for the filter.
83 mlt_filter
filter_invert_init( char *arg
)
85 mlt_filter
this = mlt_filter_new( );
87 this->process
= filter_process
;