184 lines
4.1 KiB
C
184 lines
4.1 KiB
C
/* im_black.c
|
|
*
|
|
* Copyright: 1990, J. Cupitt
|
|
*
|
|
* Author: J. Cupitt
|
|
* Written on: 02/08/1990
|
|
* Modified on : 16/04/1991 by N. Dessipris to work on a line by line basis
|
|
* 15/8/94 JC
|
|
* - adapted for partials
|
|
* - ANSIfied
|
|
* - memory leaks fixed!
|
|
* 2/3/98 JC
|
|
* - IM_ANY added
|
|
* 18/1/09
|
|
* - gtkdoc
|
|
* 31/10/11
|
|
* - redo as a class
|
|
*/
|
|
|
|
/*
|
|
|
|
This file is part of VIPS.
|
|
|
|
VIPS 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
|
|
|
|
*/
|
|
|
|
/*
|
|
#define VIPS_DEBUG
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif /*HAVE_CONFIG_H*/
|
|
#include <vips/intl.h>
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include <vips/vips.h>
|
|
#include <vips/internal.h>
|
|
#include <vips/debug.h>
|
|
|
|
#include "conversion.h"
|
|
|
|
typedef struct _VipsBlack {
|
|
VipsConversion parent_instance;
|
|
|
|
int width;
|
|
int height;
|
|
int bands;
|
|
|
|
} VipsBlack;
|
|
|
|
typedef VipsConversionClass VipsBlackClass;
|
|
|
|
G_DEFINE_TYPE( VipsBlack, vips_black, VIPS_TYPE_CONVERSION );
|
|
|
|
static int
|
|
vips_black_gen( VipsRegion *or, void *seq, void *a, void *b,
|
|
gboolean *stop )
|
|
{
|
|
vips_region_black( or );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
vips_black_build( VipsObject *object )
|
|
{
|
|
VipsConversion *conversion = VIPS_CONVERSION( object );
|
|
VipsBlack *black = (VipsBlack *) object;
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_black_parent_class )->build( object ) )
|
|
return( -1 );
|
|
|
|
vips_image_init_fields( conversion->out,
|
|
black->width, black->height, black->bands,
|
|
VIPS_FORMAT_UCHAR, VIPS_CODING_NONE,
|
|
black->bands == 1 ?
|
|
VIPS_INTERPRETATION_B_W : VIPS_INTERPRETATION_MULTIBAND,
|
|
1.0, 1.0 );
|
|
vips_demand_hint( conversion->out,
|
|
VIPS_DEMAND_STYLE_ANY, NULL );
|
|
|
|
if( vips_image_generate( conversion->out,
|
|
NULL, vips_black_gen, NULL, NULL, NULL ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_black_class_init( VipsBlackClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
|
|
|
|
VIPS_DEBUG_MSG( "vips_black_class_init\n" );
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
vobject_class->nickname = "black";
|
|
vobject_class->description = _( "make a black image" );
|
|
vobject_class->build = vips_black_build;
|
|
|
|
VIPS_ARG_INT( class, "width", 4,
|
|
_( "Width" ),
|
|
_( "Image width in pixels" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsBlack, width ),
|
|
1, 1000000, 1 );
|
|
|
|
VIPS_ARG_INT( class, "height", 5,
|
|
_( "Height" ),
|
|
_( "Image height in pixels" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsBlack, height ),
|
|
1, 1000000, 1 );
|
|
|
|
VIPS_ARG_INT( class, "bands", 6,
|
|
_( "Bands" ),
|
|
_( "Number of bands in image" ),
|
|
VIPS_ARGUMENT_OPTIONAL_INPUT,
|
|
G_STRUCT_OFFSET( VipsBlack, bands ),
|
|
1, 1000000, 1 );
|
|
}
|
|
|
|
static void
|
|
vips_black_init( VipsBlack *black )
|
|
{
|
|
black->bands = 1;
|
|
}
|
|
|
|
/**
|
|
* vips_black:
|
|
* @out: output image
|
|
* @width: output width
|
|
* @height: output height
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Optional arguments:
|
|
*
|
|
* @bands: output bands
|
|
*
|
|
* Make a black unsigned char image of a specified size.
|
|
*
|
|
* See also: im_make_xy(), im_text(), im_gaussnoise().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_black( VipsImage **out, int width, int height, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, height );
|
|
result = vips_call_split( "black", ap, out, width, height );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|