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 *format = mlt_image_yuv422;
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
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( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
85 mlt_filter this = mlt_filter_new( );
87 this->process = filter_process;