164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/* @(#) Creates a image file with Xsize=256, Ysize=1, Bands=bands,
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* @(#) Bbits=IM_BBITS_BYTE, BandFmt=IM_BANDFMT_UCHAR, Type=IM_TYPE_HISTOGRAM;
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* @(#)
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* @(#) The created image consist a n bands linear lut and is the basis
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* @(#) for building up look-up tables.
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* @(#)
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* @(#) int im_identity(lut, bands)
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* @(#) IMAGE *lut;
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* @(#) int bands;
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* @(#)
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* @(#) As above, but make a ushort LUT. ushort LUTs can be less than 65536
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* @(#) elements - sz is the number of elements required.
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* @(#)
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* @(#) int im_identity_ushort(lut, bands, sz)
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* @(#) IMAGE *lut;
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* @(#) int bands;
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* @(#) int sz;
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* @(#)
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* @(#) Returns -1 on error and 0 on success
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* @(#)
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*
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* Copyright 1991, N. Dessipris.
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*
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* Author N. Dessipris
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* Written on 11/03/1991
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* Updated on:
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* 18/6/93 JC
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* - im_outcheck() call added
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* - ANSIfied
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* 24/8/94 JC
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* - im_identity_ushort() added
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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
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it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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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#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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#ifdef WITH_DMALLOC
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#include <dmalloc.h>
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#endif /*WITH_DMALLOC*/
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int
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im_identity( IMAGE *lut, int bands )
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{
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unsigned char *buf, *p;
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int x, z;
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/* Check input args
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*/
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if( im_outcheck( lut ) )
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return( -1 );
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if( bands < 0 ) {
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im_error( "im_identity", "%s", _( "bad bands" ) );
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return( -1 );
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}
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/* Set new image properly.
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*/
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im_initdesc( lut,
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256, 1, bands, IM_BBITS_BYTE, IM_BANDFMT_UCHAR,
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IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 );
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/* Make output.
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*/
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if( im_setupout( lut ) )
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return( -1 );
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/* Create output buffer.
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*/
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if( !(buf = (unsigned char *) im_malloc( lut, bands * 256 )) )
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return( -1 );
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/* Write ramp.
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*/
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for( p = buf, x = 0; x < 256; x++ )
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for( z = 0; z < bands; z++ )
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*p++ = x;
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if( im_writeline( 0, lut, buf ) )
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return( -1 );
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return( 0 );
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}
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int
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im_identity_ushort( IMAGE *lut, int bands, int sz )
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{
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unsigned short *buf, *p;
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int x, z;
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/* Check input args
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*/
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if( im_outcheck( lut ) )
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return( -1 );
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if( sz > 65536 || sz < 0 ) {
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im_error( "im_identity_ushort", "%s", _( "bad size" ) );
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return( -1 );
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}
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if( bands < 0 ) {
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im_error( "im_identity_ushort", "%s", _( "bad bands" ) );
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return( -1 );
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}
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/* Set new image.
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*/
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im_initdesc( lut,
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sz, 1, bands, IM_BBITS_SHORT, IM_BANDFMT_USHORT,
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IM_CODING_NONE, IM_TYPE_HISTOGRAM, 1.0, 1.0, 0, 0 );
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/* Make output.
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*/
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if( im_setupout( lut ) )
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return( -1 );
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/* Create output buffer.
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*/
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if( !(buf = (unsigned short *)
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im_malloc( lut, sz * bands * sizeof( unsigned short ) )) )
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return( -1 );
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/* Write ramp.
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*/
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for( p = buf, x = 0; x < sz; x++ )
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for( z = 0; z < bands; z++ )
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*p++ = x;
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if( im_writeline( 0, lut, (PEL *) buf ) )
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return( -1 );
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return( 0 );
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}
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