205 lines
4.6 KiB
C
205 lines
4.6 KiB
C
/* photographic negative ... just an example, really
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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: 12/02/1990
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* Modified on :
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* 7/7/93 JC
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* - memory leaks fixed
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* - adapted for partial v2
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* - ANSIfied
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* 22/2/95 JC
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* - tidied up again
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* 2/9/09
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* - gtk-doc comment
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* 23/8/11
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* - rewrite as a class
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* 7/12/12
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* - only invert real part of complex
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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 <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 "unary.h"
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typedef VipsUnary VipsInvert;
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typedef VipsUnaryClass VipsInvertClass;
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G_DEFINE_TYPE( VipsInvert, vips_invert, VIPS_TYPE_UNARY );
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#define LOOP( TYPE, L ) { \
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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] = (L) - p[x]; \
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}
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#define LOOPN( TYPE ) { \
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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] = -1 * p[x]; \
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}
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#define LOOPC( TYPE ) { \
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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[0] = -1 * p[0]; \
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q[1] = p[1]; \
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\
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p += 2; \
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q += 2; \
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} \
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}
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static void
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vips_invert_buffer( VipsArithmetic *arithmetic,
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VipsPel *out, VipsPel **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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switch( vips_image_get_format( im ) ) {
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case VIPS_FORMAT_UCHAR:
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LOOP( unsigned char, UCHAR_MAX ); break;
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case VIPS_FORMAT_CHAR:
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LOOPN( signed char ); break;
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case VIPS_FORMAT_USHORT:
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LOOP( unsigned short, USHRT_MAX ); break;
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case VIPS_FORMAT_SHORT:
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LOOPN( signed short ); break;
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case VIPS_FORMAT_UINT:
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LOOP( unsigned int, UINT_MAX ); break;
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case VIPS_FORMAT_INT:
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LOOPN( signed int ); break;
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case VIPS_FORMAT_FLOAT:
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LOOPN( float ); break;
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case VIPS_FORMAT_DOUBLE:
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LOOPN( double ); break;
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case VIPS_FORMAT_COMPLEX:
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LOOPC( float ); break;
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case VIPS_FORMAT_DPCOMPLEX:
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LOOPC( double ); 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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/* Format doesn't change with invert.
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*/
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static const VipsBandFormat vips_invert_format_table[10] = {
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/* UC C US S UI I F X D DX */
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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_invert_class_init( VipsInvertClass *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 = "invert";
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object_class->description = _( "invert an image" );
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aclass->process_line = vips_invert_buffer;
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vips_arithmetic_set_format_table( aclass, vips_invert_format_table );
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}
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static void
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vips_invert_init( VipsInvert *invert )
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{
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}
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/**
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* vips_invert:
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* @in: input image
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* @out: output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* For unsigned formats, this operation calculates (max - @in), eg. (255 -
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* @in) for uchar. For signed and float formats, this operation calculates (-1
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* @in).
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*
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* For complex images, only the real part is inverted. See also vips_conj().
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*
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* See also: vips_linear().
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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_invert( 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_call_split( "invert", ap, in, out );
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va_end( ap );
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return( result );
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}
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