291 lines
6.6 KiB
C
291 lines
6.6 KiB
C
/* round.c --- various rounding operations
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*
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* 20/6/02 JC
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* - adapted from im_abs()
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* 29/8/09
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* - gtkdoc
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* - tiny cleanups
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* 19/9/09
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* - im_ceil.c adapted to make round.c
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* 10/11/11
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* - redone 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 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 "unary.h"
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typedef struct _VipsRound {
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VipsUnary parent_instance;
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VipsOperationRound round;
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} VipsRound;
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typedef VipsUnaryClass VipsRoundClass;
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G_DEFINE_TYPE( VipsRound, vips_round, VIPS_TYPE_UNARY );
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static int
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vips_round_build( VipsObject *object )
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{
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VipsUnary *unary = (VipsUnary *) object;
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/* Is this one of the int types? Degenerate to vips_copy() if it
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* is.
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*/
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if( unary->in &&
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vips_band_format_isint( unary->in->BandFmt ) )
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return( vips_unary_copy( unary ) );
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if( VIPS_OBJECT_CLASS( vips_round_parent_class )->build( object ) )
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return( -1 );
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return( 0 );
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}
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#define LOOP( TYPE, OP ) { \
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TYPE * restrict p = (TYPE *) in[0]; \
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TYPE * restrict q = (TYPE *) out; \
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\
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for( x = 0; x < sz; x++ ) \
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q[x] = OP( p[x] ); \
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}
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#define SWITCH( OP ) { \
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switch( vips_image_get_format( im ) ) { \
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case VIPS_FORMAT_COMPLEX: \
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case VIPS_FORMAT_FLOAT: LOOP( float, OP ); break; \
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\
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case VIPS_FORMAT_DPCOMPLEX: \
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case VIPS_FORMAT_DOUBLE:LOOP( double, OP ); break;\
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\
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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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static void
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vips_round_buffer( VipsArithmetic *arithmetic,
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VipsPel *out, VipsPel **in, int width )
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{
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VipsRound *round = (VipsRound *) arithmetic;
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VipsImage *im = arithmetic->ready[0];
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/* Complex just doubles the size.
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*/
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const int sz = width * im->Bands *
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(vips_band_format_iscomplex( im->BandFmt ) ? 2 : 1);
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int x;
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switch( round->round ) {
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case VIPS_OPERATION_ROUND_RINT: SWITCH( VIPS_RINT ); break;
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case VIPS_OPERATION_ROUND_CEIL: SWITCH( VIPS_CEIL ); break;
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case VIPS_OPERATION_ROUND_FLOOR: SWITCH( VIPS_FLOOR ); 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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/* 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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static const VipsBandFormat vips_round_format_table[10] = {
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/* Band format: UC C US S UI I F X D DX */
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/* Promotion: */ UC, C, US, S, UI, I, F, X, D, DX
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};
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static void
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vips_round_class_init( VipsRoundClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsArithmeticClass *aclass = VIPS_ARITHMETIC_CLASS( class );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "round";
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object_class->description = _( "perform a round function on an image" );
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object_class->build = vips_round_build;
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aclass->process_line = vips_round_buffer;
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vips_arithmetic_set_format_table( aclass, vips_round_format_table );
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VIPS_ARG_ENUM( class, "round", 200,
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_( "Round operation" ),
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_( "Rounding operation to perform" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsRound, round ),
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VIPS_TYPE_OPERATION_ROUND, VIPS_OPERATION_ROUND_RINT );
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}
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static void
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vips_round_init( VipsRound *round )
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{
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}
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static int
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vips_roundv( VipsImage *in, VipsImage **out,
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VipsOperationRound round, va_list ap )
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{
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return( vips_call_split( "round", ap, in, out, round ) );
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}
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/**
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* vips_round: (method)
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* @in: input #VipsImage
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* @out: (out): output #VipsImage
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* @round: #VipsOperationRound rounding operation to perform
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* @...: %NULL-terminated list of optional named arguments
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*
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* Round to an integral value.
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*
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* Copy for integer types, round float and
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* complex types.
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*
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* The format of @out is always the same as @in, so you may wish to cast to an
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* integer format afterwards.
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*
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* See also: vips_cast()
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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_round( VipsImage *in, VipsImage **out, VipsOperationRound round, ... )
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{
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va_list ap;
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int result;
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va_start( ap, round );
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result = vips_roundv( in, out, round, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_floor: (method)
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* @in: input #VipsImage
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* @out: (out): output #VipsImage
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* @...: %NULL-terminated list of optional named arguments
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*
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* Round to an integral value with #VIPS_OPERATION_ROUND_FLOOR. See
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* vips_round().
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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_floor( VipsImage *in, 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_roundv( in, out, VIPS_OPERATION_ROUND_FLOOR, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_ceil: (method)
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* @in: input #VipsImage
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* @out: (out): output #VipsImage
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* @...: %NULL-terminated list of optional named arguments
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*
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* Round to an integral value with #VIPS_OPERATION_ROUND_CEIL. See
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* vips_round().
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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_ceil( VipsImage *in, 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_roundv( in, out, VIPS_OPERATION_ROUND_CEIL, ap );
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va_end( ap );
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return( result );
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}
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/**
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* vips_rint: (method)
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* @in: input #VipsImage
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* @out: (out): output #VipsImage
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* @...: %NULL-terminated list of optional named arguments
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*
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* Round to an integral value with #VIPS_OPERATION_ROUND_RINT. See
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* vips_round().
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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_rint( VipsImage *in, 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_roundv( in, out, VIPS_OPERATION_ROUND_RINT, ap );
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va_end( ap );
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return( result );
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}
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