348 lines
8.0 KiB
C
348 lines
8.0 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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* @(#) Separable mask of sizes 1xN or Nx1
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* @(#)
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* @(#) int im_convsepf( in, out, mask )
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* @(#) IMAGE *in, *out;
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* @(#) DOUBLEMASK *mask; details in mask.h
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* @(#)
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* @(#) Returns either 0 (sucess) or -1 (fail)
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* @(#) Picture can have any number of channels (max 64).
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*
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* Copyright: 1990, N. Dessipris.
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*
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* Author: Nicos Dessipris
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* Written on: 29/04/1991
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* Modified on: 29/4/93 K.Martinez for sys5
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* 9/3/01 JC
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* - rewritten using im_conv()
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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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*/
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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.
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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 size; /* N for our 1xN or Nx1 mask */
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int scale; /* Our scale ... we have to ^2 mask->scale */
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} Conv;
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/* End of evaluation.
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*/
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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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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->size = mask->xsize * mask->ysize;
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conv->scale = mask->scale * mask->scale;
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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->mask = im_dup_dmask( mask, "conv_mask" )) )
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return( NULL );
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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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PEL *sum; /* Line buffer */
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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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IM_FREEF( im_region_free, seq->ir );
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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->sum = 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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if( im_isint( conv->out ) )
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seq->sum = (PEL *)
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IM_ARRAY( out, IM_IMAGE_N_ELEMENTS( in ), int );
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else
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seq->sum = (PEL *)
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IM_ARRAY( out, IM_IMAGE_N_ELEMENTS( in ), double );
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if( !seq->ir || !seq->sum ) {
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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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/* What we do for every point in the mask, for each pixel.
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*/
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#define VERTICAL_CONV { z -= 1; li -= lskip; sum += coeff[z] * vfrom[li]; }
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#define HORIZONTAL_CONV { z -= 1; li -= bands; sum += coeff[z] * hfrom[li]; }
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#define CONV_FLOAT( ITYPE, OTYPE ) { \
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ITYPE *vfrom; \
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double *vto; \
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double *hfrom; \
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OTYPE *hto; \
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\
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/* Convolve to sum array. We convolve the full width of \
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* this input line. \
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*/ \
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vfrom = (ITYPE *) IM_REGION_ADDR( ir, le, y ); \
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vto = (double *) seq->sum; \
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for( x = 0; x < isz; x++ ) { \
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double sum; \
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\
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z = conv->size; \
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li = lskip * z; \
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sum = 0; \
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\
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IM_UNROLL( z, VERTICAL_CONV ); \
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\
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vto[x] = sum; \
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vfrom += 1; \
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} \
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\
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/* Convolve sums to output. \
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*/ \
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hfrom = (double *) seq->sum; \
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hto = (OTYPE *) IM_REGION_ADDR( or, le, y ); \
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for( x = 0; x < osz; x++ ) { \
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double sum; \
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\
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z = conv->size; \
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li = bands * z; \
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sum = 0; \
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\
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IM_UNROLL( z, HORIZONTAL_CONV ); \
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\
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sum = (sum / conv->scale) + mask->offset; \
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\
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hto[x] = sum; \
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hfrom += 1; \
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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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double *coeff = conv->mask->coeff;
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int bands = in->Bands;
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Rect *r = &or->valid;
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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 osz = IM_REGION_N_ELEMENTS( or );
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Rect s;
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int lskip;
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int isz;
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int x, y, z, li;
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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 += conv->size - 1;
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s.height += conv->size - 1;
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if( im_prepare( ir, &s ) )
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return( -1 );
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lskip = IM_REGION_LSKIP( ir ) / IM_IMAGE_SIZEOF_ELEMENT( in );
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isz = IM_REGION_N_ELEMENTS( ir );
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for( y = to; y < bo; 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_convsepf_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_error( "im_convsepf", _( "non-complex uncoded only" ) );
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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_error( "im_convsepf", _( "bad mask parameters" ) );
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return( -1 );
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}
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if( mask->xsize != 1 && mask->ysize != 1 ) {
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im_error( "im_convsepf", _( "expect 1xN or Nx1 input mask" ) );
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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 -= conv->size - 1;
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out->Ysize -= conv->size - 1;
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if( out->Xsize <= 0 || out->Ysize <= 0 ) {
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im_error( "im_convsepf", _( "image too small for mask" ) );
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return( -1 );
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}
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/* SMALLTILE seems fastest.
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*/
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if( im_demand_hint( out, IM_SMALLTILE, in, NULL ) ||
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im_generate( out, start_conv, gen_conv, stop_conv, in, conv ) )
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return( -1 );
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out->Xoffset = -conv->size / 2;
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out->Yoffset = -conv->size / 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_convsepf( IMAGE *in, IMAGE *out, DOUBLEMASK *mask )
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{
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IMAGE *t1 = im_open_local( out, "im_convsepf intermediate", "p" );
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int size = mask->xsize * mask->ysize;
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if( !t1 ||
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im_embed( in, t1, 1, size / 2, size / 2,
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in->Xsize + size - 1,
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in->Ysize + size - 1 ) ||
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im_convsepf_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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