261 lines
6.3 KiB
C
261 lines
6.3 KiB
C
/* sum an array of images
|
|
*
|
|
* 18/3/14
|
|
* - from add.c
|
|
*/
|
|
|
|
/*
|
|
|
|
Copyright (C) 1991-2005 The National Gallery
|
|
|
|
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
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <math.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#include "nary.h"
|
|
|
|
typedef VipsNary VipsSum;
|
|
typedef VipsNaryClass VipsSumClass;
|
|
|
|
G_DEFINE_TYPE( VipsSum, vips_sum, VIPS_TYPE_NARY );
|
|
|
|
#define LOOP( IN, OUT ) { \
|
|
IN ** restrict p = (IN **) in; \
|
|
OUT * restrict q = (OUT *) out; \
|
|
\
|
|
for( x = 0; x < sz; x++ ) { \
|
|
OUT sum; \
|
|
\
|
|
sum = p[0][x]; \
|
|
for( i = 1; i < n; i++ ) \
|
|
sum += p[i][x]; \
|
|
q[x] = sum; \
|
|
} \
|
|
}
|
|
|
|
static void
|
|
sum_buffer( VipsArithmetic *arithmetic, VipsPel *out, VipsPel **in, int width )
|
|
{
|
|
VipsImage *im = arithmetic->ready[0];
|
|
int n = arithmetic->n;
|
|
|
|
/* Complex just doubles the size.
|
|
*/
|
|
const int sz = width * vips_image_get_bands( im ) *
|
|
(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
|
|
2 : 1);
|
|
|
|
int x;
|
|
int i;
|
|
|
|
/* Sum all input types. Keep types here in sync with
|
|
* vips_sum_format_table[] below.
|
|
*/
|
|
switch( vips_image_get_format( im ) ) {
|
|
case VIPS_FORMAT_UCHAR:
|
|
LOOP( unsigned char, unsigned int ); break;
|
|
case VIPS_FORMAT_CHAR:
|
|
LOOP( signed char, signed int ); break;
|
|
case VIPS_FORMAT_USHORT:
|
|
LOOP( unsigned short, unsigned int ); break;
|
|
case VIPS_FORMAT_SHORT:
|
|
LOOP( signed short, signed int ); break;
|
|
case VIPS_FORMAT_UINT:
|
|
LOOP( unsigned int, unsigned int ); break;
|
|
case VIPS_FORMAT_INT:
|
|
LOOP( signed int, signed int ); break;
|
|
|
|
case VIPS_FORMAT_FLOAT:
|
|
case VIPS_FORMAT_COMPLEX:
|
|
LOOP( float, float ); break;
|
|
|
|
case VIPS_FORMAT_DOUBLE:
|
|
case VIPS_FORMAT_DPCOMPLEX:
|
|
LOOP( double, double ); break;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
}
|
|
|
|
#define UC VIPS_FORMAT_UCHAR
|
|
#define C VIPS_FORMAT_CHAR
|
|
#define US VIPS_FORMAT_USHORT
|
|
#define S VIPS_FORMAT_SHORT
|
|
#define UI VIPS_FORMAT_UINT
|
|
#define I VIPS_FORMAT_INT
|
|
#define F VIPS_FORMAT_FLOAT
|
|
#define X VIPS_FORMAT_COMPLEX
|
|
#define D VIPS_FORMAT_DOUBLE
|
|
#define DX VIPS_FORMAT_DPCOMPLEX
|
|
|
|
/* Type promotion for addition. Sign and value preserving. Make sure these
|
|
* match the case statement in sum_buffer() above.
|
|
*/
|
|
static const VipsBandFormat vips_sum_format_table[10] = {
|
|
/* UC C US S UI I F X D DX */
|
|
UI, I, UI, I, UI, I, F, X, D, DX
|
|
};
|
|
|
|
static void
|
|
vips_sum_class_init( VipsSumClass *class )
|
|
{
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
|
|
|
|
object_class->nickname = "sum";
|
|
object_class->description = _( "sum an array of images" );
|
|
|
|
aclass->process_line = sum_buffer;
|
|
|
|
vips_arithmetic_set_format_table( aclass, vips_sum_format_table );
|
|
}
|
|
|
|
static void
|
|
vips_sum_init( VipsSum *sum )
|
|
{
|
|
}
|
|
|
|
static int
|
|
vips_sumv( VipsImage **in, VipsImage **out, int n, va_list ap )
|
|
{
|
|
VipsArrayImage *array;
|
|
int result;
|
|
|
|
array = vips_array_image_new( in, n );
|
|
result = vips_call_split( "sum", ap, array, out );
|
|
vips_area_unref( VIPS_AREA( array ) );
|
|
|
|
return( result );
|
|
}
|
|
|
|
/**
|
|
* vips_sum:
|
|
* @in: (array length=n): array of input images
|
|
* @out: (out): output image
|
|
* @n: number of input images
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* This operation sums all images in @in and writes the result to @out.
|
|
*
|
|
* If the images differ in size, the smaller images are enlarged to match the
|
|
* largest by adding zero pixels along the bottom and right.
|
|
*
|
|
* If the number of bands differs, all but one of the images
|
|
* must have one band. In this case, n-band images are formed from the
|
|
* one-band images by joining n copies of the one-band images together, and then
|
|
* the n-band images are operated upon.
|
|
*
|
|
* The input images are cast up to the smallest common format (see table
|
|
* Smallest common format in
|
|
* <link linkend="libvips-arithmetic">arithmetic</link>), then the
|
|
* following table is used to determine the output type:
|
|
*
|
|
* <table>
|
|
* <title>VipsSum type promotion</title>
|
|
* <tgroup cols='2' align='left' colsep='1' rowsep='1'>
|
|
* <thead>
|
|
* <row>
|
|
* <entry>input type</entry>
|
|
* <entry>output type</entry>
|
|
* </row>
|
|
* </thead>
|
|
* <tbody>
|
|
* <row>
|
|
* <entry>uchar</entry>
|
|
* <entry>uint</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>char</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>ushort</entry>
|
|
* <entry>uint</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>short</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>uint</entry>
|
|
* <entry>uint</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>int</entry>
|
|
* <entry>int</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>float</entry>
|
|
* <entry>float</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>double</entry>
|
|
* <entry>double</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>complex</entry>
|
|
* <entry>complex</entry>
|
|
* </row>
|
|
* <row>
|
|
* <entry>double complex</entry>
|
|
* <entry>double complex</entry>
|
|
* </row>
|
|
* </tbody>
|
|
* </tgroup>
|
|
* </table>
|
|
*
|
|
* In other words, the output type is just large enough to hold the whole
|
|
* range of possible values.
|
|
*
|
|
* See also: vips_add().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
vips_sum( VipsImage **in, VipsImage **out, int n, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, n );
|
|
result = vips_sumv( in, out, n, ap );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|