320 lines
6.3 KiB
C
320 lines
6.3 KiB
C
/* @(#) Smudge and smear a piece of image. Smudge is a low-pass filter,
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* @(#) smear is an early version of smudge which contains a bug: it
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* @(#) pushes pels to the left a little too. Looks cute though.
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* @(#)
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* @(#) r is the area to smudge/smear. Clipped against the image edges
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* @(#) properly.
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* @(#)
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* @(#) int
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* @(#) im_smudge( IMAGE *im, int ix, int iy, Rect *r )
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* @(#)
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* @(#) int
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* @(#) im_smear( IMAGE *im, int ix, int iy, Rect *r )
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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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* ? JC
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* - im_makerw() changed to im_rwcheck()
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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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/* Smudge a section of an IMAGE. Smudge area r offset by x, y. Take average
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* of pixels in 3x3 area surrounding current pixel for every pixel in r. We do
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* not change the outermost pixels in the image, although we do read them.
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*/
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int
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im_smudge( IMAGE *im, int ix, int iy, Rect *r )
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{
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int x, y, a, b, c;
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int ba = im->Bands;
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int el = ba * im->Xsize;
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Rect area, image, clipped;
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double total[ 256 ];
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if( im_rwcheck( im ) )
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return( -1 );
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/* Don't do the margins.
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*/
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area = *r;
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area.left += ix;
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area.top += iy;
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image.left = 0;
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image.top = 0;
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image.width = im->Xsize;
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image.height = im->Ysize;
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im_rect_marginadjust( &image, -1 );
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im_rect_intersectrect( &area, &image, &clipped );
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/* Any left?
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*/
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if( im_rect_isempty( &clipped ) )
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return( 0 );
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/* What we do for each type.
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*/
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#define SMUDGE(TYPE) \
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for( y = clipped.top; y < clipped.top + clipped.height; y++ ) \
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for( x = clipped.left; \
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x < clipped.left + clipped.width; x++ ) { \
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TYPE *to = (TYPE *) im->data + x * ba + y * el; \
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TYPE *from = to - el - ba; \
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TYPE *f; \
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\
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for( a = 0; a < ba; a++ ) \
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total[a] = 0.0; \
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\
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for( a = 0; a < 3; a++ ) { \
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f = from; \
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for( b = 0; b < 3; b++ ) \
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for( c = 0; c < ba; c++ ) \
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total[c] += *f++; \
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from += el; \
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} \
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\
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for( a = 0; a < ba; a++ ) \
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to[a] = (16 * (double) to[a] + total[a]) \
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/ 25.0; \
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}
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/* Loop through the remaining pixels.
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*/
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switch( im->BandFmt ) {
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case IM_BANDFMT_UCHAR:
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SMUDGE(unsigned char);
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break;
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case IM_BANDFMT_CHAR:
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SMUDGE(char);
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break;
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case IM_BANDFMT_USHORT:
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SMUDGE(unsigned short);
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break;
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case IM_BANDFMT_SHORT:
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SMUDGE(short);
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break;
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case IM_BANDFMT_UINT:
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SMUDGE(unsigned int);
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break;
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case IM_BANDFMT_INT:
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SMUDGE(int);
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break;
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case IM_BANDFMT_FLOAT:
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SMUDGE(float);
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break;
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case IM_BANDFMT_DOUBLE:
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SMUDGE(double);
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break;
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/* Do complex types too. Just treat as float and double, but with
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* twice the number of bands.
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*/
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case IM_BANDFMT_COMPLEX:
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/* Twice number of bands: double size and bands.
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*/
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ba *= 2;
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el *= 2;
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SMUDGE(float);
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break;
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case IM_BANDFMT_DPCOMPLEX:
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/* Twice number of bands: double size and bands.
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*/
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ba *= 2;
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el *= 2;
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SMUDGE(double);
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break;
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default:
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im_error( "im_smudge", _( "unknown band format" ) );
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return( -1 );
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}
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im_invalidate( im );
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return( 0 );
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}
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/* Smear a section of an IMAGE. As above, but shift it left a bit.
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*/
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int
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im_smear( IMAGE *im, int ix, int iy, Rect *r )
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{
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int x, y, a, b, c;
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int ba = im->Bands;
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int el = ba * im->Xsize;
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Rect area, image, clipped;
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double total[ 256 ];
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if( im_rwcheck( im ) )
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return( -1 );
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/* Don't do the margins.
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*/
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area = *r;
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area.left += ix;
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area.top += iy;
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image.left = 0;
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image.top = 0;
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image.width = im->Xsize;
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image.height = im->Ysize;
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im_rect_marginadjust( &image, -1 );
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image.left--;
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im_rect_intersectrect( &area, &image, &clipped );
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/* Any left?
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*/
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if( im_rect_isempty( &clipped ) )
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return( 0 );
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/* What we do for each type.
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*/
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#define SMEAR(TYPE) \
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for( y = clipped.top; y < clipped.top + clipped.height; y++ ) \
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for( x = clipped.left; \
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x < clipped.left + clipped.width; x++ ) { \
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TYPE *to = (TYPE *) im->data + x * ba + y * el; \
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TYPE *from = to - el; \
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TYPE *f; \
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\
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for( a = 0; a < ba; a++ ) \
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total[a] = 0.0; \
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\
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for( a = 0; a < 3; a++ ) { \
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f = from; \
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for( b = 0; b < 3; b++ ) \
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for( c = 0; c < ba; c++ ) \
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total[c] += *f++; \
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from += el; \
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} \
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\
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for( a = 0; a < ba; a++ ) \
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to[a] = (40 * (double) to[a+ba] + total[a]) \
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/ 49.0; \
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}
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/* Loop through the remaining pixels.
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*/
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switch( im->BandFmt ) {
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case IM_BANDFMT_UCHAR:
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SMEAR(unsigned char);
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break;
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case IM_BANDFMT_CHAR:
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SMEAR(char);
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break;
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case IM_BANDFMT_USHORT:
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SMEAR(unsigned short);
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break;
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case IM_BANDFMT_SHORT:
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SMEAR(short);
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break;
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case IM_BANDFMT_UINT:
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SMEAR(unsigned int);
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break;
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case IM_BANDFMT_INT:
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SMEAR(int);
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break;
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case IM_BANDFMT_FLOAT:
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SMEAR(float);
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break;
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case IM_BANDFMT_DOUBLE:
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SMEAR(double);
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break;
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/* Do complex types too. Just treat as float and double, but with
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* twice the number of bands.
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*/
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case IM_BANDFMT_COMPLEX:
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/* Twice number of bands: double size and bands.
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*/
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ba *= 2;
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el *= 2;
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SMEAR(float);
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break;
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case IM_BANDFMT_DPCOMPLEX:
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/* Twice number of bands: double size and bands.
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*/
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ba *= 2;
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el *= 2;
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SMEAR(double);
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break;
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default:
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im_error( "im_smear", _( "unknown band format" ) );
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return( -1 );
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}
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im_invalidate( im );
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return( 0 );
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}
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