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/* load matrix from a file
*
* 5/12/11
* - from csvload.c
*/
/*
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 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 <vips/vips.h>
#include <vips/buf.h>
#include <vips/internal.h>
#include "csv.h"
typedef struct _VipsForeignLoadMatrix {
VipsForeignLoad parent_object;
/* Filename for load.
*/
char *filename;
} VipsForeignLoadMatrix;
typedef VipsForeignLoadClass VipsForeignLoadMatrixClass;
G_DEFINE_TYPE( VipsForeignLoadMatrix, vips_foreign_load_matrix,
VIPS_TYPE_FOREIGN_LOAD );
static VipsForeignFlags
vips_foreign_load_matrix_get_flags_filename( const char *filename )
{
return( 0 );
}
static VipsForeignFlags
vips_foreign_load_matrix_get_flags( VipsForeignLoad *load )
{
VipsForeignLoadMatrix *matrix = (VipsForeignLoadMatrix *) load;
return( vips_foreign_load_matrix_get_flags_filename( matrix->filename ) );
}
static int
vips_foreign_load_matrix_header( VipsForeignLoad *load )
{
VipsForeignLoadMatrix *matrix = (VipsForeignLoadMatrix *) load;
int width;
int height;
double scale;
double offset;
if( vips__matrix_read_header( matrix->filename,
&width, &height, &scale, &offset ) )
return( -1 );
vips_image_init_fields( load->out,
width, height, 1,
VIPS_FORMAT_DOUBLE,
VIPS_CODING_NONE, VIPS_INTERPRETATION_B_W, 1.0, 1.0 );
vips_image_set_double( load->out, "scale", scale );
vips_image_set_double( load->out, "offset", offset );
VIPS_SETSTR( load->out->filename, matrix->filename );
return( 0 );
}
static int
vips_foreign_load_matrix_load( VipsForeignLoad *load )
{
VipsForeignLoadMatrix *matrix = (VipsForeignLoadMatrix *) load;
VipsImage *out;
if( !(out = vips__matrix_read( matrix->filename )) )
return( -1 );
if( vips_image_write( out, load->real ) ) {
g_object_unref( out );
return( -1 );
}
g_object_unref( out );
return( 0 );
}
static void
vips_foreign_load_matrix_class_init( VipsForeignLoadMatrixClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "matrixload";
object_class->description = _( "load matrix from file" );
foreign_class->suffs = vips__foreign_matrix_suffs;
/* is_a() is not that quick ... lower the priority.
*/
foreign_class->priority = -50;
load_class->is_a = vips__matrix_ismatrix;
load_class->get_flags_filename =
vips_foreign_load_matrix_get_flags_filename;
load_class->get_flags = vips_foreign_load_matrix_get_flags;
load_class->header = vips_foreign_load_matrix_header;
load_class->load = vips_foreign_load_matrix_load;
VIPS_ARG_STRING( class, "filename", 1,
_( "Filename" ),
_( "Filename to load from" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadMatrix, filename ),
NULL );
}
static void
vips_foreign_load_matrix_init( VipsForeignLoadMatrix *matrix )
{
}
/**
* vips_matrixload:
* @filename: file to load
* @out: output image
* @...: %NULL-terminated list of optional named arguments
*
* Reads a matrix from a file.
*
* Matrix files have a simple format that's supposed to be easy to create with
* a text editor or a spreadsheet.
*
* The first line has four numbers for width, height, scale and
* offset (scale and offset may be omitted, in which case they default to 1.0
* and 0.0). Scale must be non-zero. Width and height must be positive
* integers. The numbers are separated by any mixture of spaces, commas,
* tabs and quotation marks ("). The scale and offset fields may be
* floating-point, and must use '.'
* as a decimal separator.
*
* Subsequent lines each hold one row of matrix data, with numbers again
* separated by any mixture of spaces, commas,
* tabs and quotation marks ("). The numbers may be floating-point, and must
* use '.'
* as a decimal separator.
*
* Extra characters at the ends of lines or at the end of the file are
* ignored.
*
* See also: vips_csvload().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_matrixload( const char *filename, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "matrixload", ap, filename, out );
va_end( ap );
return( result );
}
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