634 lines
21 KiB
C++
634 lines
21 KiB
C++
/* snohalo (smooth nohalo) level 1 interpolator
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*
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (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 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 program; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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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* 2009 (c) Nicolas Robidoux
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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 <vips/vips.h>
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#include <vips/internal.h>
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#include "templates.h"
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/*
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* FAST_PSEUDO_FLOOR is a floor and floorf replacement which has been
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* found to be faster on several linux boxes than the library
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* version. It returns the floor of its argument unless the argument
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* is a negative integer, in which case it returns one less than the
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* floor. For example:
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*
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* FAST_PSEUDO_FLOOR(0.5) = 0
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*
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* FAST_PSEUDO_FLOOR(0.) = 0
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*
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* FAST_PSEUDO_FLOOR(-.5) = -1
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*
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* as expected, but
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*
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* FAST_PSEUDO_FLOOR(-1.) = -2
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*
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* The locations of the discontinuities of FAST_PSEUDO_FLOOR are the
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* same as floor and floorf; it is just that at negative integers the
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* function is discontinuous on the right instead of the left.
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*/
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#define FAST_PSEUDO_FLOOR(x) ( (int)(x) - ( (x) < 0. ) )
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/*
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* FAST_MINMOD is an implementation of the minmod function which only
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* needs two conditional moves. (Nicolas: I think that this may be
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* the very first two branch minmod.) The product of the two arguments
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* and a useful difference involving them are also precomputed to keep
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* them out of branching way.
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*/
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#define FAST_MINMOD(a,b,ab,abminusaa) \
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( (ab)>=0. ? ( (abminusaa)>=0. ? (a) : (b) ) : 0. )
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/* Properties.
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*/
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enum {
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PROP_BLUR = 1,
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PROP_LAST
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};
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#define VIPS_TYPE_INTERPOLATE_SNOHALO1 \
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(vips_interpolate_snohalo1_get_type())
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#define VIPS_INTERPOLATE_SNOHALO1( obj ) \
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(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
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VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1 ))
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#define VIPS_INTERPOLATE_SNOHALO1_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_CAST( (klass), \
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VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1Class))
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#define VIPS_IS_INTERPOLATE_SNOHALO1( obj ) \
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(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_INTERPOLATE_SNOHALO1 ))
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#define VIPS_IS_INTERPOLATE_SNOHALO1_CLASS( klass ) \
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(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_INTERPOLATE_SNOHALO1 ))
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#define VIPS_INTERPOLATE_SNOHALO1_GET_CLASS( obj ) \
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(G_TYPE_INSTANCE_GET_CLASS( (obj), \
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VIPS_TYPE_INTERPOLATE_SNOHALO1, VipsInterpolateSnohalo1Class ))
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typedef struct _VipsInterpolateSnohalo1 {
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VipsInterpolate parent_object;
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double blur;
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} VipsInterpolateSnohalo1;
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typedef struct _VipsInterpolateSnohalo1Class {
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VipsInterpolateClass parent_class;
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} VipsInterpolateSnohalo1Class;
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static void inline
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snohalo1( const double blur,
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const double zer_two_in,
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const double zer_thr_in,
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const double uno_one_in,
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const double uno_two_in,
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const double uno_thr_in,
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const double uno_fou_in,
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const double dos_zer_in,
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const double dos_one_in,
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const double dos_two_in,
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const double dos_thr_in,
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const double dos_fou_in,
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const double dos_fiv_in,
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const double tre_zer_in,
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const double tre_one_in,
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const double tre_two_in,
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const double tre_thr_in,
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const double tre_fou_in,
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const double tre_fiv_in,
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const double qua_one_in,
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const double qua_two_in,
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const double qua_thr_in,
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const double qua_fou_in,
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const double cin_two_in,
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const double cin_thr_in,
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double* restrict r0,
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double* restrict r1,
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double* restrict r2,
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double* restrict r3 )
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{
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const double beta = 1. + -.5 * blur;
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const double gamma = .125 * blur;
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/*
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* Computation of the blurred pixel values:
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*/
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const double uno_one_plus_zer_two_in = uno_one_in + zer_two_in;
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const double uno_two_plus_zer_thr_in = uno_two_in + zer_thr_in;
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const double dos_zer_plus_uno_one_in = dos_zer_in + uno_one_in;
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const double dos_one_plus_uno_two_in = dos_one_in + uno_two_in;
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const double dos_two_plus_uno_thr_in = dos_two_in + uno_thr_in;
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const double dos_thr_plus_uno_fou_in = dos_thr_in + uno_fou_in;
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const double tre_zer_plus_dos_one_in = tre_zer_in + dos_one_in;
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const double tre_one_plus_dos_two_in = tre_one_in + dos_two_in;
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const double tre_two_plus_dos_thr_in = tre_two_in + dos_thr_in;
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const double tre_thr_plus_dos_fou_in = tre_thr_in + dos_fou_in;
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const double tre_fou_plus_dos_fiv_in = tre_fou_in + dos_fiv_in;
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const double qua_one_plus_tre_two_in = qua_one_in + tre_two_in;
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const double qua_two_plus_tre_thr_in = qua_two_in + tre_thr_in;
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const double qua_thr_plus_tre_fou_in = qua_thr_in + tre_fou_in;
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const double qua_fou_plus_tre_fiv_in = qua_fou_in + tre_fiv_in;
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const double cin_two_plus_qua_thr_in = cin_two_in + qua_thr_in;
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const double cin_thr_plus_qua_fou_in = cin_thr_in + qua_fou_in;
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const double uno_two =
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beta * uno_two_in
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+
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( uno_one_plus_zer_two_in + dos_two_plus_uno_thr_in ) * gamma;
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const double uno_thr =
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beta * uno_thr_in
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+
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( uno_two_plus_zer_thr_in + dos_thr_plus_uno_fou_in ) * gamma;
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const double dos_one =
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beta * dos_one_in
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+
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( dos_zer_plus_uno_one_in + tre_one_plus_dos_two_in ) * gamma;
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const double dos_two =
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beta * dos_two_in
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+
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( dos_one_plus_uno_two_in + tre_two_plus_dos_thr_in ) * gamma;
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const double dos_thr =
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beta * dos_thr_in
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+
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( dos_two_plus_uno_thr_in + tre_thr_plus_dos_fou_in ) * gamma;
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const double dos_fou =
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beta * dos_fou_in
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+
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( dos_thr_plus_uno_fou_in + tre_fou_plus_dos_fiv_in ) * gamma;
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const double tre_one =
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beta * tre_one_in
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+
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( tre_zer_plus_dos_one_in + qua_one_plus_tre_two_in ) * gamma;
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const double tre_two =
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beta * tre_two_in
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+
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( tre_one_plus_dos_two_in + qua_two_plus_tre_thr_in ) * gamma;
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const double tre_thr =
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beta * tre_thr_in
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+
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( tre_two_plus_dos_thr_in + qua_thr_plus_tre_fou_in ) * gamma;
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const double tre_fou =
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beta * tre_fou_in
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+
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( tre_thr_plus_dos_fou_in + qua_fou_plus_tre_fiv_in ) * gamma;
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const double qua_two =
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beta * qua_two_in
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+
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( qua_one_plus_tre_two_in + cin_two_plus_qua_thr_in ) * gamma;
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const double qua_thr =
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beta * qua_thr_in
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+
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( qua_two_plus_tre_thr_in + cin_thr_plus_qua_fou_in ) * gamma;
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/*
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* Dos(s) horizontal differences:
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*/
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const double prem_dos = dos_two - dos_one;
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const double deux_dos = dos_thr - dos_two;
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const double troi_dos = dos_fou - dos_thr;
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/*
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* Tre(s) horizontal differences:
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*/
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const double prem_tre = tre_two - tre_one;
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const double deux_tre = tre_thr - tre_two;
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const double troi_tre = tre_fou - tre_thr;
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/*
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* Two vertical differences:
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*/
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const double prem_two = dos_two - uno_two;
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const double deux_two = tre_two - dos_two;
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const double troi_two = qua_two - tre_two;
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/*
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* Thr(ee) vertical differences:
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*/
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const double prem_thr = dos_thr - uno_thr;
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const double deux_thr = tre_thr - dos_thr;
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const double troi_thr = qua_thr - tre_thr;
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/*
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* Apply minmod to comsecutive differences:
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*/
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/*
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* Products and differences useful for minmod:
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*/
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const double deux_prem_dos = deux_dos * prem_dos;
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const double deux_deux_dos = deux_dos * deux_dos;
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const double deux_troi_dos = deux_dos * troi_dos;
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const double deux_prem_two = deux_two * prem_two;
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const double deux_deux_two = deux_two * deux_two;
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const double deux_troi_two = deux_two * troi_two;
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const double deux_prem_minus_deux_deux_dos = deux_prem_dos - deux_deux_dos;
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const double deux_troi_minus_deux_deux_dos = deux_troi_dos - deux_deux_dos;
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const double deux_prem_minus_deux_deux_two = deux_prem_two - deux_deux_two;
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const double deux_troi_minus_deux_deux_two = deux_troi_two - deux_deux_two;
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const double deux_prem_tre = deux_tre * prem_tre;
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const double deux_deux_tre = deux_tre * deux_tre;
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const double deux_troi_tre = deux_tre * troi_tre;
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const double deux_prem_thr = deux_thr * prem_thr;
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const double deux_deux_thr = deux_thr * deux_thr;
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const double deux_troi_thr = deux_thr * troi_thr;
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const double deux_prem_minus_deux_deux_tre = deux_prem_tre - deux_deux_tre;
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const double deux_troi_minus_deux_deux_tre = deux_troi_tre - deux_deux_tre;
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const double deux_prem_minus_deux_deux_thr = deux_prem_thr - deux_deux_thr;
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const double deux_troi_minus_deux_deux_thr = deux_troi_thr - deux_deux_thr;
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/*
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* Useful sums:
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*/
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const double dos_two_plus_dos_thr = dos_two + dos_thr;
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const double dos_two_plus_tre_two = dos_two + tre_two;
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const double deux_thr_plus_deux_dos = deux_thr + deux_dos;
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/*
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* Compute the needed "right" (at the boundary between one input
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* pixel areas) double resolution pixel value:
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*/
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const double four_times_dos_twothr =
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FAST_MINMOD( deux_dos, prem_dos, deux_prem_dos,
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deux_prem_minus_deux_deux_dos )
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+
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2. * dos_two_plus_dos_thr
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-
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FAST_MINMOD( deux_dos, troi_dos, deux_troi_dos,
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deux_troi_minus_deux_deux_dos );
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/*
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* Compute the needed "down" double resolution pixel value:
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*/
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const double four_times_dostre_two =
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FAST_MINMOD( deux_two, prem_two, deux_prem_two,
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deux_prem_minus_deux_deux_two )
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+
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2. * dos_two_plus_tre_two
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-
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FAST_MINMOD( deux_two, troi_two, deux_troi_two,
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deux_troi_minus_deux_deux_two );
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/*
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* Compute the "diagonal" (at the boundary between thrr input
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* pixel areas) double resolution pixel value:
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*/
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const double eight_times_dostre_twothr =
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FAST_MINMOD( deux_tre, prem_tre, deux_prem_tre,
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deux_prem_minus_deux_deux_tre )
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+
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2. * deux_thr_plus_deux_dos
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-
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FAST_MINMOD( deux_tre, troi_tre, deux_troi_tre,
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deux_troi_minus_deux_deux_tre )
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+
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four_times_dos_twothr
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+
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FAST_MINMOD( deux_thr, prem_thr, deux_prem_thr,
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deux_prem_minus_deux_deux_thr )
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+
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four_times_dostre_two
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-
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FAST_MINMOD( deux_thr, troi_thr, deux_troi_thr,
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deux_troi_minus_deux_deux_thr );
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/*
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* Return the first newly computed double density values:
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*/
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*r0 = dos_two;
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*r1 = four_times_dos_twothr;
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*r2 = four_times_dostre_two;
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*r3 = eight_times_dostre_twothr;
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}
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/* Call snohalo1 with an interpolator as a parameter.
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* It'd be nice to do this with templates somehow :-( but I can't see a
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* clean way to do it.
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*/
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#define SNOHALO1_INTER( inter ) \
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template <typename T> static void inline \
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snohalo1_ ## inter( PEL* restrict pout, \
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const PEL* restrict pin, \
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const int bands, \
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const int lskip, \
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const double blur, \
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const double relative_x, \
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const double relative_y ) \
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{ \
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T* restrict out = (T *) pout; \
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\
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const int relative_x_is_rite = ( relative_x >= 0. ); \
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const int relative_y_is_down = ( relative_y >= 0. ); \
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\
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const int sign_of_relative_x = 2 * relative_x_is_rite - 1; \
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const int sign_of_relative_y = 2 * relative_y_is_down - 1; \
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\
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const int corner_reflection_shift = \
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relative_x_is_rite * bands + relative_y_is_down * lskip; \
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\
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const int shift_back_1_pix = sign_of_relative_x * bands; \
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const int shift_back_1_row = sign_of_relative_y * lskip; \
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\
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const T* restrict in = ( (T *) pin ) + corner_reflection_shift; \
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\
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const int shift_forw_1_pix = -shift_back_1_pix; \
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const int shift_forw_1_row = -shift_back_1_row; \
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\
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const int shift_back_2_pix = 2 * shift_back_1_pix; \
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const int shift_back_2_row = 2 * shift_back_2_row; \
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\
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const double w = ( 2 * sign_of_relative_x ) * relative_x; \
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const double z = ( 2 * sign_of_relative_y ) * relative_y; \
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\
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const int shift_forw_2_pix = 2 * shift_forw_1_pix; \
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const int shift_forw_2_row = 2 * shift_forw_1_row; \
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\
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const int shift_forw_3_pix = 3 * shift_forw_1_pix; \
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const int shift_forw_3_row = 3 * shift_forw_1_row; \
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\
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const int zer_two_shift = shift_back_2_row; \
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const int zer_thr_shift = shift_forw_1_pix + shift_back_2_row; \
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\
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const int uno_one_shift = shift_back_1_pix + shift_back_1_row; \
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const int uno_two_shift = shift_back_1_row; \
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const int uno_thr_shift = shift_forw_1_pix + shift_back_1_row; \
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const int uno_fou_shift = shift_forw_2_pix + shift_back_1_row; \
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\
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const double x = 1. - w; \
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const double w_times_z = w * z; \
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\
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const int dos_zer_shift = shift_back_2_pix; \
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const int dos_one_shift = shift_back_1_pix; \
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const int dos_two_shift = 0; \
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const int dos_thr_shift = shift_forw_1_pix; \
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const int dos_fou_shift = shift_forw_2_pix; \
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const int dos_fiv_shift = shift_forw_3_pix; \
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\
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const int tre_zer_shift = shift_back_2_pix + shift_forw_1_row; \
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const int tre_one_shift = shift_back_1_pix + shift_forw_1_row; \
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const int tre_two_shift = shift_forw_1_row; \
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const int tre_thr_shift = shift_forw_1_pix + shift_forw_1_row; \
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const int tre_fou_shift = shift_forw_2_pix + shift_forw_1_row; \
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const int tre_fiv_shift = shift_forw_3_pix + shift_forw_1_row; \
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\
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const double x_times_z = x * z; \
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\
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const int qua_one_shift = shift_back_1_pix + shift_forw_2_row; \
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const int qua_two_shift = shift_forw_2_row; \
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const int qua_thr_shift = shift_forw_1_pix + shift_forw_2_row; \
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const int qua_fou_shift = shift_forw_2_pix + shift_forw_2_row; \
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\
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const int cin_two_shift = shift_forw_3_row; \
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const int cin_thr_shift = shift_forw_1_pix + shift_forw_3_row; \
|
|
\
|
|
const double w_times_y_over_4 = .25 * ( w - w_times_z ); \
|
|
const double x_times_z_over_4 = .25 * x_times_z; \
|
|
const double x_times_y_over_8 = .125 * ( x - x_times_z ); \
|
|
\
|
|
int band = bands; \
|
|
\
|
|
do \
|
|
{ \
|
|
double dos_two; \
|
|
double four_times_dos_twothr; \
|
|
double four_times_dostre_two; \
|
|
double eight_times_dostre_twothr; \
|
|
\
|
|
snohalo1( blur, \
|
|
in[zer_two_shift], in[zer_thr_shift], \
|
|
in[uno_one_shift], in[uno_two_shift], \
|
|
in[uno_thr_shift], in[uno_fou_shift], \
|
|
in[dos_zer_shift], in[dos_one_shift], \
|
|
in[dos_two_shift], in[dos_thr_shift], \
|
|
in[dos_fou_shift], in[dos_fiv_shift], \
|
|
in[tre_zer_shift], in[tre_one_shift], \
|
|
in[tre_two_shift], in[tre_thr_shift], \
|
|
in[tre_fou_shift], in[tre_fiv_shift], \
|
|
in[qua_one_shift], in[qua_two_shift], \
|
|
in[qua_thr_shift], in[qua_fou_shift], \
|
|
in[cin_two_shift], in[cin_thr_shift], \
|
|
&dos_two, \
|
|
&four_times_dos_twothr, \
|
|
&four_times_dostre_two, \
|
|
&eight_times_dostre_twothr ); \
|
|
\
|
|
const T result = bilinear_ ## inter<T>( w_times_z, \
|
|
x_times_z_over_4, \
|
|
w_times_y_over_4, \
|
|
x_times_y_over_8, \
|
|
dos_two, \
|
|
four_times_dos_twothr, \
|
|
four_times_dostre_two, \
|
|
eight_times_dostre_twothr ); \
|
|
\
|
|
in++; \
|
|
*out++ = result; \
|
|
} while (--band); \
|
|
}
|
|
|
|
SNOHALO1_INTER( fptypes )
|
|
SNOHALO1_INTER( hassign )
|
|
SNOHALO1_INTER( nosign )
|
|
|
|
/* We need C linkage for this.
|
|
*/
|
|
extern "C" {
|
|
G_DEFINE_TYPE( VipsInterpolateSnohalo1, vips_interpolate_snohalo1,
|
|
VIPS_TYPE_INTERPOLATE );
|
|
}
|
|
|
|
static void
|
|
vips_interpolate_snohalo1_interpolate( VipsInterpolate* restrict interpolate,
|
|
PEL* restrict out,
|
|
REGION* restrict in,
|
|
double absolute_x,
|
|
double absolute_y )
|
|
{
|
|
VipsInterpolateSnohalo1 *snohalo1 =
|
|
VIPS_INTERPOLATE_SNOHALO1( interpolate );
|
|
/*
|
|
* VIPS versions of Nicolas's pixel addressing values.
|
|
*/
|
|
const int actual_bands = in->im->Bands;
|
|
const int lskip = IM_REGION_LSKIP( in ) / IM_IMAGE_SIZEOF_ELEMENT( in->im );
|
|
|
|
const double absolute_y_minus_half = absolute_y - .5;
|
|
const double absolute_x_minus_half = absolute_x - .5;
|
|
/*
|
|
* floor's surrogate FAST_PSEUDO_FLOOR is used to make sure that the
|
|
* transition through 0 is smooth. If it is known that absolute_x
|
|
* and absolute_y will never be less than 0, plain cast---that is,
|
|
* const int ix = absolute_x---should be used instead. Actually,
|
|
* any function which agrees with floor for non-integer values, and
|
|
* picks one of the two possibilities for integer values, can be
|
|
* used. FAST_PSEUDO_FLOOR fits the bill.
|
|
*
|
|
* Then, x is the x-coordinate of the sampling point relative to the
|
|
* position of the center of the convex hull of the 2x2 block of
|
|
* closest pixels. Similarly for y. Range of values: [-.5,.5).
|
|
*/
|
|
const int iy = FAST_PSEUDO_FLOOR (absolute_y);
|
|
const double relative_y = absolute_y_minus_half - iy;
|
|
const int ix = FAST_PSEUDO_FLOOR (absolute_x);
|
|
const double relative_x = absolute_x_minus_half - ix;
|
|
|
|
/*
|
|
* Move the pointer to (the first band of) the top/left pixel of the
|
|
* 2x2 group of pixel centers which contains the sampling location
|
|
* in its convex hull:
|
|
*/
|
|
const PEL* restrict p = (PEL *) IM_REGION_ADDR( in, ix, iy );
|
|
|
|
/*
|
|
* Double bands for complex images:
|
|
*/
|
|
const int bands =
|
|
( im_iscomplex( in->im ) ? 2 * actual_bands : actual_bands );
|
|
|
|
#define CALL( T, inter ) \
|
|
snohalo1_ ## inter<T>( out, \
|
|
p, \
|
|
bands, \
|
|
lskip, \
|
|
snohalo1->blur, \
|
|
relative_x, \
|
|
relative_y );
|
|
|
|
switch( in->im->BandFmt ) {
|
|
case IM_BANDFMT_UCHAR:
|
|
CALL( unsigned char, nosign );
|
|
break;
|
|
|
|
case IM_BANDFMT_CHAR:
|
|
CALL( signed char, hassign );
|
|
break;
|
|
|
|
case IM_BANDFMT_USHORT:
|
|
CALL( unsigned short, nosign );
|
|
break;
|
|
|
|
case IM_BANDFMT_SHORT:
|
|
CALL( signed short, hassign );
|
|
break;
|
|
|
|
case IM_BANDFMT_UINT:
|
|
CALL( unsigned int, nosign );
|
|
break;
|
|
|
|
case IM_BANDFMT_INT:
|
|
CALL( signed int, hassign );
|
|
break;
|
|
|
|
/* Complex images handled by doubling of bands, see above.
|
|
*/
|
|
case IM_BANDFMT_FLOAT:
|
|
case IM_BANDFMT_COMPLEX:
|
|
CALL( float, fptypes );
|
|
break;
|
|
|
|
case IM_BANDFMT_DOUBLE:
|
|
case IM_BANDFMT_DPCOMPLEX:
|
|
CALL( double, fptypes );
|
|
break;
|
|
|
|
default:
|
|
g_assert( 0 );
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
vips_interpolate_snohalo1_class_init( VipsInterpolateSnohalo1Class *klass )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( klass );
|
|
VipsObjectClass *object_class = VIPS_OBJECT_CLASS( klass );
|
|
VipsInterpolateClass *interpolate_class =
|
|
VIPS_INTERPOLATE_CLASS( klass );
|
|
|
|
GParamSpec *pspec;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "snohalo1";
|
|
object_class->description = _( "Nohalo level 1 with antialiasing blur" );
|
|
|
|
interpolate_class->interpolate =
|
|
vips_interpolate_snohalo1_interpolate;
|
|
interpolate_class->window_size = 6;
|
|
|
|
/* Create properties.
|
|
*/
|
|
pspec =
|
|
g_param_spec_double( "blur",
|
|
_( "Blur" ),
|
|
_( "Antialiasing (diagonal straightening) blur amount" ),
|
|
0., 1., 1.,
|
|
(GParamFlags) G_PARAM_READWRITE );
|
|
g_object_class_install_property( gobject_class,
|
|
PROP_BLUR, pspec );
|
|
vips_object_class_install_argument( object_class, pspec,
|
|
VIPS_ARGUMENT_SET_ONCE,
|
|
G_STRUCT_OFFSET( VipsInterpolateSnohalo1, blur ) );
|
|
|
|
}
|
|
|
|
static void
|
|
vips_interpolate_snohalo1_init( VipsInterpolateSnohalo1 *snohalo1 )
|
|
{
|
|
}
|