96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/* @(#) Optimised 4 frame average
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Copyright (C) 1992, Kirk Martinez, History of Art Dept, Birkbeck College
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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 <stdlib.h>
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#include <string.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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#define ARGS "fav4: frame average 4 frames\nARGS: im1 im2 im3 im4 outfile"
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#define NFRAMES 4
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/* @(#) Optimised 4 frame average
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Copyright (C) 1992, Kirk Martinez, History of Art Dept, Birkbeck College
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CHAR images only!
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ARGS: array of 4 source images and output image
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*/
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int
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im_fav4( IMAGE **in, IMAGE *out)
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{
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PEL *result, *buffer, *p1, *p2, *p3, *p4;
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int x,y;
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int linebytes, PICY;
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/* check IMAGEs parameters
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*/
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if(im_iocheck(in[1], out)) return(-1);
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/* BYTE images only!
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*/
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if( (in[0]->BandFmt != IM_BANDFMT_CHAR) && (in[0]->BandFmt != IM_BANDFMT_UCHAR)) return(-1);
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if ( im_cp_desc(out, in[1]) == -1) /* copy image descriptors */
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return(-1);
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if ( im_setupout(out) == -1)
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return(-1);
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linebytes = in[0]->Xsize * in[0]->Bands;
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PICY = in[0]->Ysize;
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buffer = (PEL*)im_malloc(NULL,linebytes);
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memset(buffer, 0, linebytes);
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p1 = (PEL*)in[0]->data;
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p2 = (PEL*)in[1]->data;
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p3 = (PEL*)in[2]->data;
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p4 = (PEL*)in[3]->data;
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for (y = 0; y < PICY; y++)
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{
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result = buffer;
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/* average 4 pels with rounding, for whole line*/
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for (x = 0; x < linebytes; x++) {
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*result++ = (PEL)((int)((int)*p1++ + (int)*p2++ + (int)*p3++ + (int)*p4++ +2) >> 2);
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}
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im_writeline(y,out, buffer);
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}
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im_free(buffer);
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return(0);
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}
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