350 lines
8.2 KiB
C
350 lines
8.2 KiB
C
/* @(#) Convolve an image with a DOUBLEMASK. Image can have any number of bands,
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* @(#) any non-complex type. Output is IM_BANDFMT_FLOAT for all non-complex inputs
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* @(#) except IM_BANDFMT_DOUBLE, which gives IM_BANDFMT_DOUBLE.
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* @(#)
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* @(#) int
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* @(#) im_convf( in, out, mask )
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* @(#) IMAGE *in, *out;
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* @(#) DOUBLEMASK *mask;
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* @(#)
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* @(#) Returns either 0 (success) or -1 (fail)
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* @(#)
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris & Kirk Martinez
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* Written on: 29/04/1991
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* Modified on: 19/05/1991
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* 8/7/93 JC
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* - adapted for partial v2
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* - memory leaks fixed
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* - ANSIfied
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* 12/7/93 JC
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* - adapted im_convbi() to im_convbf()
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* 7/10/94 JC
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* - new IM_ARRAY() macro
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* - evalend callbacks
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* - more typedef
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* 9/3/01 JC
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* - redone from im_conv()
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* 27/7/01 JC
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* - rejects masks with scale == 0
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* 7/4/04
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* - now uses im_embed() with edge stretching on the input, not
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* the output
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* - sets Xoffset / Yoffset
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* 11/11/05
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* - simpler inner loop avoids gcc4 bug
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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 <limits.h>
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#include <assert.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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/* Our parameters ... we take a copy of the mask argument, plus we make a
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* smaller version with the zeros squeezed out.
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*/
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typedef struct {
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IMAGE *in;
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IMAGE *out;
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DOUBLEMASK *mask; /* Copy of mask arg */
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int nnz; /* Number of non-zero mask elements */
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double *coeff; /* Array of non-zero mask coefficients */
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} Conv;
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static int
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conv_destroy( Conv *conv )
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{
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if( conv->mask ) {
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(void) im_free_dmask( conv->mask );
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conv->mask = NULL;
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}
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return( 0 );
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}
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static Conv *
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conv_new( IMAGE *in, IMAGE *out, DOUBLEMASK *mask )
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{
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Conv *conv = IM_NEW( out, Conv );
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const int ne = mask->xsize * mask->ysize;
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int i;
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if( !conv )
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return( NULL );
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conv->in = in;
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conv->out = out;
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conv->mask = NULL;
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conv->nnz = 0;
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conv->coeff = NULL;
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if( im_add_close_callback( out,
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(im_callback_fn) conv_destroy, conv, NULL ) ||
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!(conv->coeff = IM_ARRAY( out, ne, double )) ||
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!(conv->mask = im_dup_dmask( mask, "conv_mask" )) )
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return( NULL );
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/* Find non-zero mask elements.
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*/
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for( i = 0; i < ne; i++ )
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if( mask->coeff[i] )
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conv->coeff[conv->nnz++] = mask->coeff[i];
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return( conv );
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}
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/* Our sequence value.
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*/
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typedef struct {
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Conv *conv;
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REGION *ir; /* Input region */
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int *offsets; /* Offsets for each non-zero matrix element */
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PEL **pts; /* Per-non-zero mask element image pointers */
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} ConvSequence;
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/* Free a sequence value.
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*/
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static int
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stop_conv( ConvSequence *seq, IMAGE *in, Conv *conv )
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{
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/* Free attached objects.
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*/
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if( seq->ir ) {
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im_region_free( seq->ir );
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seq->ir = NULL;
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}
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return( 0 );
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}
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/* Convolution start function.
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*/
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static void *
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start_conv( IMAGE *out, IMAGE *in, Conv *conv )
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{
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ConvSequence *seq = IM_NEW( out, ConvSequence );
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if( !seq )
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return( NULL );
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/* Init!
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*/
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seq->conv = conv;
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seq->ir = NULL;
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seq->pts = NULL;
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/* Attach region and arrays.
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*/
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seq->ir = im_region_create( in );
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seq->offsets = IM_ARRAY( out, conv->nnz, int );
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seq->pts = IM_ARRAY( out, conv->nnz, PEL * );
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if( !seq->ir || !seq->offsets || !seq->pts ) {
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stop_conv( seq, in, conv );
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return( NULL );
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}
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return( (void *) seq );
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}
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#define INNER sum += *t++ * (*p++)[x]
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#define CONV_FLOAT( ITYPE, OTYPE ) { \
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OTYPE *q = (OTYPE *) IM_REGION_ADDR( or, le, y ); \
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\
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for( x = 0; x < sz; x++ ) { \
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double sum = 0; \
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double *t = conv->coeff; \
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ITYPE **p = (ITYPE **) seq->pts; \
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\
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z = 0; \
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IM_UNROLL( conv->nnz, INNER ); \
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\
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sum = (sum / mask->scale) + mask->offset; \
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\
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q[x] = sum; \
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} \
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}
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/* Convolve!
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*/
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static int
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gen_conv( REGION *or, ConvSequence *seq, IMAGE *in, Conv *conv )
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{
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REGION *ir = seq->ir;
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DOUBLEMASK *mask = conv->mask;
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Rect *r = &or->valid;
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Rect s;
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int le = r->left;
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int to = r->top;
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int bo = IM_RECT_BOTTOM(r);
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int sz = IM_REGION_N_ELEMENTS( or );
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int x, y, z, i;
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/* Prepare the section of the input image we need. A little larger
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* than the section of the output image we are producing.
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*/
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s = *r;
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s.width += mask->xsize - 1;
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s.height += mask->ysize - 1;
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if( im_prepare( ir, &s ) )
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return( -1 );
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/* Fill offset array.
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*/
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z = 0;
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for( i = 0, y = 0; y < mask->ysize; y++ )
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for( x = 0; x < mask->xsize; x++, i++ )
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if( mask->coeff[i] )
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seq->offsets[z++] =
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IM_REGION_ADDR( ir, x + le, y + to ) -
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IM_REGION_ADDR( ir, le, to );
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for( y = to; y < bo; y++ ) {
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/* Init pts for this line of PELs.
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*/
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for( z = 0; z < conv->nnz; z++ )
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seq->pts[z] = seq->offsets[z] +
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(PEL *) IM_REGION_ADDR( ir, le, y );
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switch( in->BandFmt ) {
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case IM_BANDFMT_UCHAR:
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CONV_FLOAT( unsigned char, float ); break;
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case IM_BANDFMT_CHAR:
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CONV_FLOAT( signed char, float ); break;
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case IM_BANDFMT_USHORT:
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CONV_FLOAT( unsigned short, float ); break;
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case IM_BANDFMT_SHORT:
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CONV_FLOAT( signed short, float ); break;
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case IM_BANDFMT_UINT:
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CONV_FLOAT( unsigned int, float ); break;
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case IM_BANDFMT_INT:
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CONV_FLOAT( signed int, float ); break;
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case IM_BANDFMT_FLOAT:
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CONV_FLOAT( float, float ); break;
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case IM_BANDFMT_DOUBLE:
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CONV_FLOAT( double, double ); break;
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default:
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assert( 0 );
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}
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}
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return( 0 );
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}
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int
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im_convf_raw( IMAGE *in, IMAGE *out, DOUBLEMASK *mask )
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{
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Conv *conv;
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/* Check parameters.
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*/
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if( !in || in->Coding != IM_CODING_NONE || im_iscomplex( in ) ) {
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im_errormsg( "im_convf: input non-complex uncoded please!");
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return( -1 );
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}
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if( !mask || mask->xsize > 1000 || mask->ysize > 1000 ||
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mask->xsize <= 0 || mask->ysize <= 0 || !mask->coeff ||
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mask->scale == 0 ) {
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im_errormsg( "im_convf: nonsense mask parameters" );
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return( -1 );
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}
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if( im_piocheck( in, out ) )
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return( -1 );
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if( !(conv = conv_new( in, out, mask )) )
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return( -1 );
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/* Prepare output. Consider a 7x7 mask and a 7x7 image --- the output
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* would be 1x1.
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*/
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if( im_cp_desc( out, in ) )
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return( -1 );
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if( im_isint( in ) ) {
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out->Bbits = IM_BBITS_FLOAT;
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out->BandFmt = IM_BANDFMT_FLOAT;
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}
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out->Xsize -= mask->xsize - 1;
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out->Ysize -= mask->ysize - 1;
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if( out->Xsize <= 0 || out->Ysize <= 0 ) {
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im_errormsg( "im_convf: image too small for mask" );
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return( -1 );
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}
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/* Set demand hints. FATSTRIP is good for us, as THINSTRIP will cause
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* too many recalculations on overlaps.
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*/
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if( im_demand_hint( out, IM_FATSTRIP, in, NULL ) )
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return( -1 );
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if( im_generate( out, start_conv, gen_conv, stop_conv, in, conv ) )
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return( -1 );
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out->Xoffset = -mask->xsize / 2;
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out->Yoffset = -mask->ysize / 2;
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return( 0 );
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}
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/* The above, with a border to make out the same size as in.
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*/
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int
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im_convf( IMAGE *in, IMAGE *out, DOUBLEMASK *mask )
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{
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IMAGE *t1 = im_open_local( out, "im_convf intermediate", "p" );
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if( !t1 ||
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im_embed( in, t1, 1, mask->xsize / 2, mask->ysize / 2,
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in->Xsize + mask->xsize - 1,
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in->Ysize + mask->ysize - 1 ) ||
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im_convf_raw( t1, out, mask ) )
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return( -1 );
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out->Xoffset = 0;
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out->Yoffset = 0;
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return( 0 );
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}
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