120 lines
2.5 KiB
C
120 lines
2.5 KiB
C
/* @(#) Read a pel out of an image and into a buffer, plot a pel back into
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* @(#) the image again.
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* @(#)
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* @(#) int
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* @(#) im_readpoint( IMAGE *im, int x, int y, PEL *ink )
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* @(#)
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* @(#) int
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* @(#) im_plotpoint( IMAGE *im, int x, int y, PEL *ink )
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* @(#)
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*
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* Copyright: J. Cupitt
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* Written: 15/06/1992
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* 22/7/93 JC
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* - im_incheck() added
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* 16/8/94 JC
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* - im_incheck() changed to im_makerw()
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* 5/12/06
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* - im_invalidate() after paint
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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 <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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/* Read a colour from an image.
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*/
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int
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im_readpoint( IMAGE *im, int x, int y, PEL *pel )
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{
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int es = im->Bbits >> 3;
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int ps = es * im->Bands;
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int ls = ps * im->Xsize;
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int b;
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PEL *from;
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if( im_rwcheck( im ) )
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return( -1 );
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/* Check coordinates in range.
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*/
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if( x > im->Xsize || x < 0 || y > im->Ysize || y < 0 ) {
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im_errormsg( "im_readpoint: invalid cooordinates" );
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return( 1 );
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}
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/* Suck single pixel.
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*/
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from = (PEL *) im->data + x * ps + y * ls;
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for( b = 0; b < ps; b++ )
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*pel++ = *from++;
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return( 0 );
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}
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/* Plot a point in an image.
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*/
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int
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im_plotpoint( IMAGE *im, int x, int y, PEL *pel )
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{
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int es = im->Bbits >> 3;
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int ps = es * im->Bands;
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int ls = ps * im->Xsize;
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int b;
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PEL *to;
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if( im_rwcheck( im ) )
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return( -1 );
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/* Check coordinates in range.
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*/
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if( x > im->Xsize || x < 0 || y > im->Ysize || y < 0 )
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return( 0 );
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/* Paint single pixel.
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*/
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to = (PEL *) im->data + x * ps + y * ls;
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for( b = 0; b < ps; b++ )
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*to++ = *pel++;
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im_invalidate( im );
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return( 0 );
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}
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