started VipsLinear
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John Cupitt
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285
libvips/arithmetic/linear.c
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285
libvips/arithmetic/linear.c
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/* im_lintra.c -- linear transform
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*
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* Copyright: 1990, N. Dessipris, based on im_powtra()
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* Author: Nicos Dessipris
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* Written on: 02/05/1990
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* Modified on:
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* 23/4/93 JC
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* - adapted to work with partial images
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* 1/7/93 JC
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* - adapted for partial v2
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* 7/10/94 JC
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* - new IM_NEW()
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* - more typedefs
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* 9/2/95 JC
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* - adapted for im_wrap...
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* - operations on complex images now just transform the real channel
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* 29/9/95 JC
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* - complex was broken
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* 15/4/97 JC
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* - return(0) missing from generate, arrgh!
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* 1/7/98 JC
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* - im_lintra_vec added
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* 3/8/02 JC
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* - fall back to im_copy() for a == 1, b == 0
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* 10/10/02 JC
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* - auug, failing to multiply imag for complex! (thanks matt)
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* 10/12/02 JC
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* - removed im_copy() fallback ... meant that output format could change
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* with value :-( very confusing
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* 30/6/04
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* - added 1 band image * n band vector case
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* 8/12/06
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* - add liboil support
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* 9/9/09
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* - gtkdoc comment, minor reformat
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* 31/7/10
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* - remove liboil
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* 31/10/11
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* - rework 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 program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 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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#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 "arithmetic.h"
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#include "unary.h"
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/**
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* VipsLinear:
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* @in: input #VipsImage
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* @out: output #VipsImage
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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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* See also: im_lintra().
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*
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* Returns: 0 on success, -1 on error
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*/
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typedef struct _VipsLinear {
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VipsUnary parent_instance;
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/* Our constants: multiply by a, add b.
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*/
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VipsArea *a;
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VipsArea *b;
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} VipsLinear;
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typedef VipsUnaryClass VipsLinearClass;
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G_DEFINE_TYPE( VipsLinear, vips_linear, VIPS_TYPE_UNARY );
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static int
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vips_linear_build( VipsObject *object )
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{
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VipsArithmetic *arithmetic = VIPS_ARITHMETIC( object );
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VipsLinear *linear = (VipsLinear *) object;
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if( VIPS_OBJECT_CLASS( vips_insert_parent_class )->build( object ) )
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return( -1 );
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if( vips_check_vector( "VipsLinear",
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linear->a->n, arithmetic->in[0] ) ||
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vips_check_vector( "VipsLinear",
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linear->b->n, arithmetic->in[0] ) )
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return( -1 );
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how do we do this?? unary or arithmetic needs a bit of chopping about
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if( in->Bands == 1 )
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out->Bands = n;
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bandalike a and b
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return( 0 );
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}
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static void
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vips_linear_buffer( VipsArithmetic *arithmetic, PEL *out, PEL **in, int width )
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{
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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 * vips_image_get_bands( im ) *
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(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
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2 : 1);
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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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case VIPS_FORMAT_COMPLEX:
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LOOPN( float ); break;
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case VIPS_FORMAT_DOUBLE:
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case VIPS_FORMAT_DPCOMPLEX:
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LOOPN( double ); break;
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default:
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g_assert( 0 );
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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 linear.
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*/
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static const VipsBandFormat vips_bandfmt_linear[10] = {
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/* UC C US S UI I F X D DX */
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F, F F, F, F, F, F, X, D, DX
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};
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static void
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vips_invert_buffer( VipsArithmetic *arithmetic, PEL *out, PEL **in, int width )
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{
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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 * vips_image_get_bands( im ) *
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(vips_band_format_iscomplex( vips_image_get_format( im ) ) ?
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2 : 1);
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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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case VIPS_FORMAT_COMPLEX:
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LOOPN( float ); break;
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case VIPS_FORMAT_DOUBLE:
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case VIPS_FORMAT_DPCOMPLEX:
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LOOPN( double ); break;
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default:
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g_assert( 0 );
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}
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}
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static void
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vips_linear_class_init( VipsLinearClass *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 = "linear";
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object_class->description = _( "calculate (a * in + b)" );
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object_class->build = vips_linear_build;
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vips_arithmetic_set_format_table( aclass, vips_bandfmt_linear );
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aclass->process_line = vips_linear_buffer;
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VIPS_ARG_BOXED( class, "a", 4,
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_( "a" ),
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_( "Multiply by this" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsLinear, a ),
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VIPS_TYPE_ARRAY_DOUBLE );
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VIPS_ARG_BOXED( class, "b", 5,
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_( "b" ),
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_( "Add this" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsLinear, b ),
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VIPS_TYPE_ARRAY_DOUBLE );
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}
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static void
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vips_linear_init( VipsLinear *linear )
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{
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}
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int
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vips_linear( 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( "linear", ap, in, out );
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va_end( ap );
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return( result );
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}
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