215 lines
5.2 KiB
C
215 lines
5.2 KiB
C
/* Fold up x into bands.
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*
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* 5/6/15
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* - from copy.c
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* 10/6/15
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* - add @factor option
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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/*
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#define VIPS_DEBUG
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include <vips/debug.h>
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#include "pconversion.h"
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typedef struct _VipsBandunfold {
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VipsConversion parent_instance;
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/* The input image.
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*/
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VipsImage *in;
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int factor;
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} VipsBandunfold;
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typedef VipsConversionClass VipsBandunfoldClass;
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G_DEFINE_TYPE( VipsBandunfold, vips_bandunfold, VIPS_TYPE_CONVERSION );
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static int
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vips_bandunfold_gen( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsBandunfold *bandunfold = (VipsBandunfold *) b;
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VipsRegion *ir = (VipsRegion *) seq;
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VipsImage *in = ir->im;
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VipsImage *out = or->im;
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VipsRect *r = &or->valid;
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int esize = VIPS_IMAGE_SIZEOF_ELEMENT( in );
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int psize = VIPS_IMAGE_SIZEOF_PEL( out );
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VipsRect need;
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int y;
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need.left = r->left / bandunfold->factor;
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need.top = r->top;
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need.width = (1 + r->width) / bandunfold->factor;
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need.height = r->height;
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if( vips_region_prepare( ir, &need ) )
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return( -1 );
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for( y = 0; y < r->height; y++ ) {
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VipsPel *p = VIPS_REGION_ADDR( ir,
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r->left / bandunfold->factor, r->top + y ) +
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(r->left % bandunfold->factor) * esize;
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VipsPel *q = VIPS_REGION_ADDR( or, r->left, r->top + y );
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/* We can't use vips_region_region() since we change pixel
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* coordinates.
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*/
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memcpy( q, p, r->width * psize );
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}
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return( 0 );
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}
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static int
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vips_bandunfold_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsBandunfold *bandunfold = (VipsBandunfold *) object;
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if( VIPS_OBJECT_CLASS( vips_bandunfold_parent_class )->build( object ) )
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return( -1 );
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if( vips_image_pio_input( bandunfold->in ) )
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return( -1 );
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if( bandunfold->factor == 0 )
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bandunfold->factor = bandunfold->in->Bands;
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if( bandunfold->in->Bands % bandunfold->factor != 0 ) {
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vips_error( class->nickname,
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"%s", _( "@factor must be a factor of image bands" ) );
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return( -1 );
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}
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if( vips_image_pipelinev( conversion->out,
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VIPS_DEMAND_STYLE_THINSTRIP, bandunfold->in, NULL ) )
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return( -1 );
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conversion->out->Xsize *= bandunfold->factor;
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conversion->out->Bands /= bandunfold->factor;
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if( vips_image_generate( conversion->out,
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vips_start_one, vips_bandunfold_gen, vips_stop_one,
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bandunfold->in, bandunfold ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_bandunfold_class_init( VipsBandunfoldClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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VIPS_DEBUG_MSG( "vips_bandunfold_class_init\n" );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "bandunfold";
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vobject_class->description = _( "unfold image bands into x axis" );
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vobject_class->build = vips_bandunfold_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "in", 1,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsBandunfold, in ) );
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VIPS_ARG_INT( class, "factor", 11,
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_( "Factor" ),
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_( "Unfold by this factor" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsBandunfold, factor ),
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0, 10000000, 0 );
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}
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static void
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vips_bandunfold_init( VipsBandunfold *bandunfold )
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{
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/* 0 means unfold by width, see above.
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*/
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bandunfold->factor = 0;
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}
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/**
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* vips_bandunfold: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* * @factor: unfold by this factor
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*
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* Unfold image bands into x axis.
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* Use @factor to set how much to unfold by: @factor 3, for example, will make
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* the output image three times wider than the input, and with one third
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* as many bands. By default, all bands are unfolded.
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*
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* See also: vips_csvload(), vips_bandfold().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_bandunfold( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "bandunfold", ap, in, out );
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va_end( ap );
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return( result );
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}
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