261 lines
6.3 KiB
C
261 lines
6.3 KiB
C
/* sum an array of images
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*
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* 18/3/14
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* - from add.c
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; 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 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 <math.h>
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#include <vips/vips.h>
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#include "nary.h"
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typedef VipsNary VipsSum;
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typedef VipsNaryClass VipsSumClass;
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G_DEFINE_TYPE( VipsSum, vips_sum, VIPS_TYPE_NARY );
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#define LOOP( IN, OUT ) { \
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IN ** restrict p = (IN **) in; \
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OUT * restrict q = (OUT *) out; \
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\
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for( x = 0; x < sz; x++ ) { \
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OUT sum; \
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\
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sum = p[0][x]; \
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for( i = 1; i < n; i++ ) \
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sum += p[i][x]; \
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q[x] = sum; \
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} \
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}
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static void
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sum_buffer( VipsArithmetic *arithmetic, VipsPel *out, VipsPel **in, int width )
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{
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VipsImage *im = arithmetic->ready[0];
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int n = arithmetic->n;
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/* Complex just doubles the size.
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*/
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const int sz = width * vips_image_get_bands( im ) *
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(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
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2 : 1);
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int x;
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int i;
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/* Sum all input types. Keep types here in sync with
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* vips_sum_format_table[] below.
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*/
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switch( vips_image_get_format( im ) ) {
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case VIPS_FORMAT_UCHAR:
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LOOP( unsigned char, unsigned int ); break;
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case VIPS_FORMAT_CHAR:
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LOOP( signed char, signed int ); break;
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case VIPS_FORMAT_USHORT:
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LOOP( unsigned short, unsigned int ); break;
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case VIPS_FORMAT_SHORT:
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LOOP( signed short, signed int ); break;
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case VIPS_FORMAT_UINT:
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LOOP( unsigned int, unsigned int ); break;
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case VIPS_FORMAT_INT:
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LOOP( signed int, signed int ); break;
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case VIPS_FORMAT_FLOAT:
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case VIPS_FORMAT_COMPLEX:
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LOOP( float, float ); break;
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case VIPS_FORMAT_DOUBLE:
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case VIPS_FORMAT_DPCOMPLEX:
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LOOP( double, double ); break;
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default:
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g_assert_not_reached();
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}
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}
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#define UC VIPS_FORMAT_UCHAR
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#define C VIPS_FORMAT_CHAR
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#define US VIPS_FORMAT_USHORT
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#define S VIPS_FORMAT_SHORT
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#define UI VIPS_FORMAT_UINT
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#define I VIPS_FORMAT_INT
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#define F VIPS_FORMAT_FLOAT
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#define X VIPS_FORMAT_COMPLEX
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#define D VIPS_FORMAT_DOUBLE
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#define DX VIPS_FORMAT_DPCOMPLEX
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/* Type promotion for addition. Sign and value preserving. Make sure these
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* match the case statement in sum_buffer() above.
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*/
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static const VipsBandFormat vips_sum_format_table[10] = {
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/* Band format: UC C US S UI I F X D DX */
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/* Promotion: */ UI, I, UI, I, UI, I, F, X, D, DX
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};
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static void
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vips_sum_class_init( VipsSumClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
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object_class->nickname = "sum";
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object_class->description = _( "sum an array of images" );
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aclass->process_line = sum_buffer;
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vips_arithmetic_set_format_table( aclass, vips_sum_format_table );
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}
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static void
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vips_sum_init( VipsSum *sum )
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{
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}
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static int
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vips_sumv( VipsImage **in, VipsImage **out, int n, va_list ap )
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{
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VipsArrayImage *array;
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int result;
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array = vips_array_image_new( in, n );
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result = vips_call_split( "sum", ap, array, out );
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vips_area_unref( VIPS_AREA( array ) );
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return( result );
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}
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/**
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* vips_sum:
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* @in: (array length=n): array of input images
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* @out: (out): output image
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* @n: number of input images
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* @...: %NULL-terminated list of optional named arguments
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*
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* This operation sums all images in @in and writes the result to @out.
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*
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* If the images differ in size, the smaller images are enlarged to match the
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* largest by adding zero pixels along the bottom and right.
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*
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* If the number of bands differs, all but one of the images
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* must have one band. In this case, n-band images are formed from the
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* one-band images by joining n copies of the one-band images together, and then
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* the n-band images are operated upon.
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*
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* The input images are cast up to the smallest common format (see table
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* Smallest common format in
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* <link linkend="libvips-arithmetic">arithmetic</link>), then the
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* following table is used to determine the output type:
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*
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* <table>
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* <title>VipsSum type promotion</title>
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* <tgroup cols='2' align='left' colsep='1' rowsep='1'>
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* <thead>
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* <row>
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* <entry>input type</entry>
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* <entry>output type</entry>
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* </row>
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* </thead>
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* <tbody>
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* <row>
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* <entry>uchar</entry>
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* <entry>uint</entry>
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* </row>
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* <row>
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* <entry>char</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>ushort</entry>
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* <entry>uint</entry>
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* </row>
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* <row>
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* <entry>short</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>uint</entry>
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* <entry>uint</entry>
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* </row>
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* <row>
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* <entry>int</entry>
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* <entry>int</entry>
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* </row>
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* <row>
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* <entry>float</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>double</entry>
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* <entry>double</entry>
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* </row>
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* <row>
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* <entry>complex</entry>
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* <entry>complex</entry>
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* </row>
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* <row>
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* <entry>double complex</entry>
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* <entry>double complex</entry>
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* </row>
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* </tbody>
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* </tgroup>
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* </table>
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*
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* In other words, the output type is just large enough to hold the whole
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* range of possible values.
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*
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* See also: vips_add().
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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_sum( VipsImage **in, VipsImage **out, int n, ... )
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{
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va_list ap;
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int result;
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va_start( ap, n );
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result = vips_sumv( in, out, n, ap );
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va_end( ap );
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return( result );
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}
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