| /* @(#) Subtract two images |
| * @(#) Images must have the same no of bands and can be of any type |
| * @(#) No check for overflow is carried out. |
| * @(#) |
| * @(#) int |
| * @(#) im_subtract( in1, in2, out) |
| * @(#) IMAGE *in1, *in2, *out; |
| * @(#) |
| * @(#) Returns 0 on success and -1 on error |
| * @(#) |
| * |
| * Copyright: 1990, N. Dessipris. |
| * |
| * Author: Nicos Dessipris |
| * Written on: 02/05/1990 |
| * Modified on: |
| * 29/4/93 J.Cupitt |
| * - now works for partial images |
| * 1/7/93 JC |
| * - adapted for partial v2 |
| * 9/5/95 JC |
| * - simplified: now just handles 10 cases (instead of 50), using |
| * im_clip2*() to help |
| * - now uses im_wrapmany() rather than im_generate() |
| * 12/6/95 JC |
| * - new im_add() adapted to make this |
| * 31/5/96 JC |
| * - what was this SWAP() stuff? failed for small - big! |
| * 22/8/03 JC |
| * - cast up more quickly to help accuracy |
| * 27/9/04 |
| * - updated for 1 band $op n band image -> n band image case |
| * 8/12/06 |
| * - add liboil support |
| * 18/8/08 |
| * - revise upcasting system |
| * - add gtkdoc comments |
| * - remove separate complex case, just double size |
| */ |
| |
| /* |
| |
| 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| */ |
| |
| /* |
| |
| These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk |
| |
| */ |
| |
| #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 <assert.h> |
| |
| #include <vips/vips.h> |
| #include <vips/internal.h> |
| |
| #ifdef HAVE_LIBOIL |
| #include <liboil/liboil.h> |
| #endif /*HAVE_LIBOIL*/ |
| |
| #ifdef WITH_DMALLOC |
| #include <dmalloc.h> |
| #endif /*WITH_DMALLOC*/ |
| |
| #define LOOP( IN, OUT ) { \ |
| IN *p1 = (IN *) in[0]; \ |
| IN *p2 = (IN *) in[1]; \ |
| OUT *q = (OUT *) out; \ |
| \ |
| for( x = 0; x < sz; x++ ) \ |
| q[x] = p1[x] - p2[x]; \ |
| } |
| |
| static void |
| subtract_buffer( PEL **in, PEL *out, int width, IMAGE *im ) |
| { |
| /* Complex just doubles the size. |
| */ |
| const int sz = width * im->Bands * |
| (vips_bandfmt_iscomplex( im->BandFmt ) ? 2 : 1); |
| |
| int x; |
| |
| /* Add all input types. Keep types here in sync with bandfmt_subtract[] |
| * below. |
| */ |
| switch( im->BandFmt ) { |
| case IM_BANDFMT_CHAR: LOOP( signed char, signed short ); break; |
| case IM_BANDFMT_UCHAR: LOOP( unsigned char, signed short ); break; |
| case IM_BANDFMT_SHORT: LOOP( signed short, signed int ); break; |
| case IM_BANDFMT_USHORT: LOOP( unsigned short, signed int ); break; |
| case IM_BANDFMT_INT: LOOP( signed int, signed int ); break; |
| case IM_BANDFMT_UINT: LOOP( unsigned int, signed int ); break; |
| |
| case IM_BANDFMT_FLOAT: |
| case IM_BANDFMT_COMPLEX: |
| #ifdef HAVE_LIBOIL |
| oil_subtract_f32( (float *) out, |
| (float *) in[0], (float *) in[1], sz ); |
| #else /*!HAVE_LIBOIL*/ |
| LOOP( float, float ); |
| #endif /*HAVE_LIBOIL*/ |
| break; |
| |
| case IM_BANDFMT_DOUBLE: |
| case IM_BANDFMT_DPCOMPLEX: |
| LOOP( double, double ); |
| break; |
| |
| default: |
| assert( 0 ); |
| } |
| } |
| |
| /* Save a bit of typing. |
| */ |
| #define UC IM_BANDFMT_UCHAR |
| #define C IM_BANDFMT_CHAR |
| #define US IM_BANDFMT_USHORT |
| #define S IM_BANDFMT_SHORT |
| #define UI IM_BANDFMT_UINT |
| #define I IM_BANDFMT_INT |
| #define F IM_BANDFMT_FLOAT |
| #define X IM_BANDFMT_COMPLEX |
| #define D IM_BANDFMT_DOUBLE |
| #define DX IM_BANDFMT_DPCOMPLEX |
| |
| /* Type promotion for subtraction. Sign and value preserving. Make sure these |
| * match the case statement in subtract_buffer() above. |
| */ |
| static int bandfmt_subtract[10] = { |
| /* UC C US S UI I F X D DX */ |
| S, S, I, I, I, I, F, X, D, DX |
| }; |
| |
| /** |
| * im_subtract: |
| * @in1: input image 1 |
| * @in2: input image 2 |
| * @out: output image |
| * |
| * This operation calculates @in1 - @in2 and writes the result to @out. |
| * The images must be the same size. They may have any format. |
| * |
| * If the number of bands differs, one of the images |
| * must have one band. In this case, an n-band image is formed from the |
| * one-band image by joining n copies of the one-band image together, and then |
| * the two n-band images are operated upon. |
| * |
| * The two input images are cast up to the smallest common type (see table |
| * Smallest common format in |
| * <link linkend="VIPS-arithmetic">arithmetic</link>), then the |
| * following table is used to determine the output type: |
| * |
| * <table> |
| * <title>im_subtract() 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>short</entry> |
| * </row> |
| * <row> |
| * <entry>char</entry> |
| * <entry>short</entry> |
| * </row> |
| * <row> |
| * <entry>ushort</entry> |
| * <entry>int</entry> |
| * </row> |
| * <row> |
| * <entry>short</entry> |
| * <entry>int</entry> |
| * </row> |
| * <row> |
| * <entry>uint</entry> |
| * <entry>int</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: im_add(), im_lintra(). |
| * |
| * Returns: 0 on success, -1 on error |
| */ |
| int |
| im_subtract( IMAGE *in1, IMAGE *in2, IMAGE *out ) |
| { |
| return( im__arith_binary( "im_subtract", |
| in1, in2, out, |
| bandfmt_subtract, |
| (im_wrapmany_fn) subtract_buffer, NULL ) ); |
| } |
