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/* Fold up x into bands.
*
* 5/6/15
* - from copy.c
* 10/6/15
* - add @factor option
*/
/*
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 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 <stdlib.h>
#include <string.h>
#include <math.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#include "pconversion.h"
typedef struct _VipsBandfold {
VipsConversion parent_instance;
/* The input image.
*/
VipsImage *in;
int factor;
} VipsBandfold;
typedef VipsConversionClass VipsBandfoldClass;
G_DEFINE_TYPE( VipsBandfold, vips_bandfold, VIPS_TYPE_CONVERSION );
static int
vips_bandfold_gen( VipsRegion *or,
void *seq, void *a, void *b, gboolean *stop )
{
VipsBandfold *bandfold = (VipsBandfold *) b;
VipsRegion *ir = (VipsRegion *) seq;
VipsImage *out = or->im;
VipsRect *r = &or->valid;
int psize = VIPS_IMAGE_SIZEOF_PEL( out );
VipsRect need;
int y;
need.left = r->left * bandfold->factor;
need.top = r->top;
need.width = r->width * bandfold->factor;
need.height = r->height;
if( vips_region_prepare( ir, &need ) )
return( -1 );
for( y = 0; y < r->height; y++ ) {
VipsPel *p = VIPS_REGION_ADDR( ir,
r->left * bandfold->factor, r->top + y );
VipsPel *q = VIPS_REGION_ADDR( or, r->left, r->top + y );
/* We can't use vips_region_region() since we change pixel
* coordinates.
*/
memcpy( q, p, psize * r->width );
}
return( 0 );
}
static int
vips_bandfold_build( VipsObject *object )
{
VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
VipsConversion *conversion = VIPS_CONVERSION( object );
VipsBandfold *bandfold = (VipsBandfold *) object;
if( VIPS_OBJECT_CLASS( vips_bandfold_parent_class )->build( object ) )
return( -1 );
if( vips_image_pio_input( bandfold->in ) )
return( -1 );
if( bandfold->factor == 0 )
bandfold->factor = bandfold->in->Xsize;
if( bandfold->in->Xsize % bandfold->factor != 0 ) {
vips_error( class->nickname,
"%s", _( "@factor must be a factor of image width" ) );
return( -1 );
}
if( vips_image_pipelinev( conversion->out,
VIPS_DEMAND_STYLE_THINSTRIP, bandfold->in, NULL ) )
return( -1 );
conversion->out->Xsize /= bandfold->factor;
conversion->out->Bands *= bandfold->factor;
if( vips_image_generate( conversion->out,
vips_start_one, vips_bandfold_gen, vips_stop_one,
bandfold->in, bandfold ) )
return( -1 );
return( 0 );
}
static void
vips_bandfold_class_init( VipsBandfoldClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
VIPS_DEBUG_MSG( "vips_bandfold_class_init\n" );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "bandfold";
vobject_class->description = _( "fold up x axis into bands" );
vobject_class->build = vips_bandfold_build;
operation_class->flags = VIPS_OPERATION_SEQUENTIAL_UNBUFFERED;
VIPS_ARG_IMAGE( class, "in", 1,
_( "Input" ),
_( "Input image" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsBandfold, in ) );
VIPS_ARG_INT( class, "factor", 11,
_( "Factor" ),
_( "Fold by this factor" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsBandfold, factor ),
0, 10000000, 0 );
}
static void
vips_bandfold_init( VipsBandfold *bandfold )
{
/* 0 means fold by width, see above.
*/
bandfold->factor = 0;
}
/**
* vips_bandfold:
* @in: input image
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @factor: fold by this factor
*
* Fold up an image horizontally: width is collapsed into bands.
* Use @factor to set how much to fold by: @factor 3, for example, will make
* the output image three times narrower than the input, and with three times
* as many bands. By default the whole of the input width is folded up.
*
* See also: vips_csvload(), vips_bandunfold().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_bandfold( VipsImage *in, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "bandfold", ap, in, out );
va_end( ap );
return( result );
}
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