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;