You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.4 KiB
91 lines
2.4 KiB
/*
|
|
* filter_invert.c -- invert filter
|
|
* Copyright (C) 2003-2004 Ushodaya Enterprises Limited
|
|
* Author: Charles Yates <charles.yates@pandora.be>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "filter_invert.h"
|
|
|
|
#include <framework/mlt_frame.h>
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <math.h>
|
|
#include <string.h>
|
|
|
|
static inline int clamp( int v, int l, int u )
|
|
{
|
|
return v < l ? l : ( v > u ? u : v );
|
|
}
|
|
|
|
/** Do it :-).
|
|
*/
|
|
|
|
static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
|
|
{
|
|
// Get the image
|
|
mlt_filter filter = mlt_frame_pop_service( this );
|
|
int mask = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "alpha" );
|
|
int error = mlt_frame_get_image( this, image, format, width, height, 1 );
|
|
|
|
// Only process if we have no error and a valid colour space
|
|
if ( error == 0 && *format == mlt_image_yuv422 )
|
|
{
|
|
uint8_t *p = *image;
|
|
uint8_t *q = *image + *width * *height * 2;
|
|
uint8_t *r = *image;
|
|
|
|
while ( p != q )
|
|
{
|
|
*p ++ = clamp( 251 - *r ++, 16, 235 );
|
|
*p ++ = clamp( 256 - *r ++, 16, 240 );
|
|
}
|
|
|
|
if ( mask )
|
|
{
|
|
uint8_t *alpha = mlt_frame_get_alpha_mask( this );
|
|
int size = *width * *height;
|
|
memset( alpha, mask, size );
|
|
}
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/** Filter processing.
|
|
*/
|
|
|
|
static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
|
|
{
|
|
// Push the frame filter
|
|
mlt_frame_push_service( frame, this );
|
|
mlt_frame_push_get_image( frame, filter_get_image );
|
|
return frame;
|
|
}
|
|
|
|
/** Constructor for the filter.
|
|
*/
|
|
|
|
mlt_filter filter_invert_init( char *arg )
|
|
{
|
|
mlt_filter this = mlt_filter_new( );
|
|
if ( this != NULL )
|
|
this->process = filter_process;
|
|
return this;
|
|
}
|
|
|