/* absolute value * * Copyright: 1990, N. Dessipris, based on im_powtra() * Author: Nicos Dessipris * Written on: 02/05/1990 * Modified on: * 5/5/93 J.Cupitt * - adapted from im_lintra to work with partial images * - complex and signed support added * 30/6/93 JC * - adapted for partial v2 * - ANSI conversion * - spe29873r6k3h()**!@lling errors removed * 9/2/95 JC * - adapted for im_wrap... * 20/6/02 JC * - tiny speed up * 8/12/06 * - add liboil support * 28/8/09 * - gtkdoc * - tiny polish * 31/7/10 * - remove liboil * 6/11/11 * - redone as a class * 3/12/13 * - add orc, though the speed improvement vs. gcc's auto-vectorizer * seems very marginal * 21/2/19 * - move orc init to first use of abs */ /* 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 #endif /*HAVE_CONFIG_H*/ #include #include #include #include #include #include "unary.h" typedef VipsUnary VipsAbs; typedef VipsUnaryClass VipsAbsClass; G_DEFINE_TYPE( VipsAbs, vips_abs, VIPS_TYPE_UNARY ); static void * vips_abs_orc_init_cb( void *a ) { VipsAbs *abs = (VipsAbs *) a; VipsArithmeticClass *aclass = VIPS_ARITHMETIC_GET_CLASS( abs ); VipsVector *v; vips_arithmetic_set_vector( aclass ); v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_CHAR ); vips_vector_asm2( v, "absb", "d1", "s1" ); v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_SHORT ); vips_vector_asm2( v, "absw", "d1", "s1" ); v = vips_arithmetic_get_program( aclass, VIPS_FORMAT_INT ); vips_vector_asm2( v, "absl", "d1", "s1" ); vips_arithmetic_compile( aclass ); return( NULL ); } static int vips_abs_build( VipsObject *object ) { static GOnce once = G_ONCE_INIT; VipsUnary *unary = (VipsUnary *) object; VIPS_ONCE( &once, vips_abs_orc_init_cb, object ); if( unary->in && vips_band_format_isuint( unary->in->BandFmt ) ) return( vips_unary_copy( unary ) ); if( VIPS_OBJECT_CLASS( vips_abs_parent_class )->build( object ) ) return( -1 ); return( 0 ); } /* Integer abs operation: just test and negate. */ #define ABS_INT( TYPE ) { \ TYPE * restrict p = (TYPE *) in[0]; \ TYPE * restrict q = (TYPE *) out; \ int x; \ \ for( x = 0; x < sz; x++ ) \ q[x] = p[x] < 0 ? 0 - p[x] : p[x]; \ } /* Float abs operation: call fabs(). */ #define ABS_FLOAT( TYPE ) { \ TYPE * restrict p = (TYPE *) in[0]; \ TYPE * restrict q = (TYPE *) out; \ int x; \ \ for( x = 0; x < sz; x++ ) \ q[x] = VIPS_FABS( p[x] ); \ } /* Complex abs operation: calculate modulus. */ #ifdef HAVE_HYPOT #define ABS_COMPLEX( TYPE ) { \ TYPE * restrict p = (TYPE *) in[0]; \ TYPE * restrict q = (TYPE *) out; \ int x; \ \ for( x = 0; x < sz; x++ ) { \ q[x] = hypot( p[0], p[1] ); \ p += 2; \ } \ } #else /*HAVE_HYPOT*/ #define ABS_COMPLEX( TYPE ) { \ TYPE * restrict p = (TYPE *) in[0]; \ TYPE * restrict q = (TYPE *) out; \ int x; \ \ for( x = 0; x < sz; x++ ) { \ double rp = p[0]; \ double ip = p[1]; \ double abs_rp = VIPS_FABS( rp ); \ double abs_ip = VIPS_FABS( ip ); \ \ if( abs_rp > abs_ip ) { \ double temp = ip / rp; \ \ q[x] = abs_rp * sqrt( 1.0 + temp * temp ); \ } \ else { \ double temp = rp / ip; \ \ q[x] = abs_ip * sqrt( 1.0 + temp * temp ); \ } \ \ p += 2; \ } \ } #endif /*HAVE_HYPOT*/ static void vips_abs_buffer( VipsArithmetic *arithmetic, VipsPel *out, VipsPel **in, int width ) { VipsArithmeticClass *class = VIPS_ARITHMETIC_GET_CLASS( arithmetic ); VipsImage *im = arithmetic->ready[0]; const int bands = vips_image_get_bands( im ); int sz = width * bands; VipsVector *v; if( (v = vips_arithmetic_get_vector( class, vips_image_get_format( im ) )) ) { VipsExecutor ex; vips_executor_set_program( &ex, v, sz ); vips_executor_set_array( &ex, v->s[0], in[0] ); vips_executor_set_destination( &ex, out ); vips_executor_run( &ex ); } else { switch( vips_image_get_format( im ) ) { case VIPS_FORMAT_CHAR: ABS_INT( signed char ); break; case VIPS_FORMAT_SHORT: ABS_INT( signed short ); break; case VIPS_FORMAT_INT: ABS_INT( signed int ); break; case VIPS_FORMAT_FLOAT: ABS_FLOAT( float ); break; case VIPS_FORMAT_DOUBLE: ABS_FLOAT( double ); break; case VIPS_FORMAT_COMPLEX: ABS_COMPLEX( float ); break; case VIPS_FORMAT_DPCOMPLEX: ABS_COMPLEX( double ); break; default: g_assert_not_reached(); } } } /* Save a bit of typing. */ #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 /* Format doesn't change with abs, other than complex -> real. */ static const VipsBandFormat vips_abs_format_table[10] = { /* Band format: UC C US S UI I F X D DX */ /* Promotion: */ UC, C, US, S, UI, I, F, F, D, D }; static void vips_abs_class_init( VipsAbsClass *class ) { VipsObjectClass *object_class = (VipsObjectClass *) class; VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class ); object_class->nickname = "abs"; object_class->description = _( "absolute value of an image" ); object_class->build = vips_abs_build; aclass->process_line = vips_abs_buffer; vips_arithmetic_set_format_table( aclass, vips_abs_format_table ); } static void vips_abs_init( VipsAbs *abs ) { } /** * vips_abs: (method) * @in: input #VipsImage * @out: (out): output #VipsImage * @...: %NULL-terminated list of optional named arguments * * This operation finds the absolute value of an image. It does a copy for * unsigned integer types, negate for negative values in * signed integer types, fabs(3) for * float types, and calculates modulus for complex * types. * * See also: vips_sign(). * * Returns: 0 on success, -1 on error */ int vips_abs( VipsImage *in, VipsImage **out, ... ) { va_list ap; int result; va_start( ap, out ); result = vips_call_split( "abs", ap, in, out ); va_end( ap ); return( result ); }