317 lines
7.8 KiB
C
317 lines
7.8 KiB
C
/* Divide two images
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 02/05/1990
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* Modified on:
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* 29/4/93 JC
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* - now works for partial images
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* 1/7/93 JC
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* - adapted for partial v2
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* - ANSIfied
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* 19/10/93 JC
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* - coredump-inducing bug in complex*complex fixed
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* 13/12/93
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* - char*short bug fixed
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* 12/6/95 JC
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* - new im_multiply adapted to make new im_divide
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* 27/9/04
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* - updated for 1 band $op n band image -> n band image case
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* 8/12/06
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* - add liboil support
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* 18/8/08
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* - revise upcasting system
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* - add gtkdoc comments
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* 31/7/10
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* - remove liboil support
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* - avoid /0
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* 6/11/11
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* - rewrite as a class
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*/
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/*
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Copyright (C) 1991-2005 The National Gallery
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 <vips/intl.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 "binary.h"
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/**
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* VipsDivide::
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* @in1: input #IMAGE 1
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* @in2: input #IMAGE 2
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* @out: output #IMAGE
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*
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* This operation calculates @in1 / @in2 and writes the result to @out. If any
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* pixels in @in2 are zero, the corresponding pixel in @out is also zero.
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*
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* If the images differ in size, the smaller image is enlarged to match the
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* larger by adding zero pixels along the bottom and right.
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*
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* If the number of bands differs, one of the images
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* must have one band. In this case, an n-band image is formed from the
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* one-band image by joining n copies of the one-band image together, and then
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* the two n-band images are operated upon.
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*
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* The two input images are cast up to the smallest common type (see table
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* Smallest common format in
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* <link linkend="VIPS-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>im_divide() 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>float</entry>
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* </row>
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* <row>
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* <entry>char</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>ushort</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>short</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>uint</entry>
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* <entry>float</entry>
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* </row>
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* <row>
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* <entry>int</entry>
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* <entry>float</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: #VipsAdd, #VipsSubtract.
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*/
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typedef VipsBinary VipsDivide;
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typedef VipsBinaryClass VipsDivideClass;
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G_DEFINE_TYPE( VipsDivide, vips_divide, VIPS_TYPE_BINARY );
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/* Complex divide.
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*/
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#ifdef USE_MODARG_DIV
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/* This is going to be much slower */
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#define CLOOP( TYPE ) { \
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TYPE *left = (TYPE *) in[0]; \
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TYPE *right = (TYPE *) in[1]; \
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TYPE *q = (TYPE *) out; \
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int i; \
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\
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for( i = 0; i < sz; i++ ) { \
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double arg = atan2( left[1], left[0] ) - \
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atan2( right[1], right[0] ); \
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double mod = hypot( left[1], left[0] ) / \
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hypot( right[1], right[0] ); \
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\
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q[0] = mod * cos( arg ); \
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q[1] = mod * sin( arg ); \
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\
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left += 2; \
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right += 2; \
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q += 2; \
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} \
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}
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#else /* USE_MODARG_DIV */
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#define CLOOP( TYPE ) { \
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TYPE *left = (TYPE *) in[0]; \
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TYPE *right = (TYPE *) in[1]; \
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TYPE *q = (TYPE *) out; \
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int i; \
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\
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for( i = 0; i < sz; i++ ) { \
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if( fabs( right[0] ) > fabs( right[1] ) ) { \
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double a = right[1] / right[0]; \
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double b = right[0] + right[1] * a; \
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\
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q[0] = (left[0] + left[1] * a) / b; \
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q[1] = (left[1] - left[0] * a) / b; \
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} \
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else { \
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double a = right[0] / right[1]; \
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double b = right[1] + right[0] * a; \
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\
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q[0] = (left[0] * a + left[1]) / b; \
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q[1] = (left[1] * a - left[0]) / b; \
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} \
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\
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left += 2; \
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right += 2; \
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q += 2; \
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} \
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}
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#endif /* USE_MODARG_DIV */
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/* Real divide.
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*/
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#define RLOOP( IN, OUT ) { \
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IN *left = (IN *) in[0]; \
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IN *right = (IN *) in[1]; \
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OUT *q = (OUT *) out; \
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\
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for( x = 0; x < sz; x++ ) \
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if( right[x] == 0.0 ) \
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q[x] = 0; \
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else \
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q[x] = left[x] / right[x]; \
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}
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static void
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vips_divide_buffer( VipsArithmetic *arithmetic,
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PEL *out, PEL **in, int width )
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{
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VipsImage *im = arithmetic->ready[0];
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const int sz = width * vips_image_get_bands( im );
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int x;
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/* Keep types here in sync with bandfmt_divide[]
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* below.
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*/
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switch( vips_image_get_format( im ) ) {
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case VIPS_FORMAT_CHAR: RLOOP( signed char, signed short ); break;
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case VIPS_FORMAT_UCHAR: RLOOP( unsigned char, signed short ); break;
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case VIPS_FORMAT_SHORT: RLOOP( signed short, signed int ); break;
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case VIPS_FORMAT_USHORT:RLOOP( unsigned short, signed int ); break;
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case VIPS_FORMAT_INT: RLOOP( signed int, signed int ); break;
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case VIPS_FORMAT_UINT: RLOOP( unsigned int, signed int ); break;
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case VIPS_FORMAT_FLOAT: RLOOP( float, float ); break;
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case VIPS_FORMAT_DOUBLE: RLOOP( double, double ); break;
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case VIPS_FORMAT_COMPLEX: CLOOP( float ); break;
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case VIPS_FORMAT_DPCOMPLEX: CLOOP( double ); break;
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default:
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g_assert( 0 );
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}
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}
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/* Save a bit of typing.
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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 division. Sign and value preserving. Make sure
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* these match the case statement in divide_buffer() above.
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*/
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static int vips_bandfmt_divide[10] = {
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/* UC C US S UI I F X D DX */
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F, F, F, F, F, F, F, X, D, DX
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};
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static void
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vips_divide_class_init( VipsDivideClass *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 = "divide";
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object_class->description = _( "divide two images" );
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vips_arithmetic_set_format_table( aclass, vips_bandfmt_divide );
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aclass->process_line = vips_divide_buffer;
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}
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static void
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vips_divide_init( VipsDivide *divide )
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{
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}
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int
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vips_divide( VipsImage *left, VipsImage *right, 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( "divide", ap, left, right, out );
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va_end( ap );
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return( result );
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}
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