824 lines
17 KiB
C
824 lines
17 KiB
C
/* morphological operators
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*
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* 19/9/95 JC
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* - rewritten
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* 6/7/99 JC
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* - small tidies
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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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* 21/4/08
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* - only rebuild the buffer offsets if bpl changes
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* - small cleanups
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* 25/10/10
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* - start again from the Orc'd im_conv
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* 29/10/10
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* - use VipsVector
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* - do erode as well
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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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/*
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#define DEBUG
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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 <vips/vips.h>
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#include <vips/vector.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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/* The two operators we implement. They are more hit-miss, really.
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*/
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typedef enum {
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ERODE,
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DILATE
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} MorphOp;
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/* We can't run more than this many passes. Larger than this and we
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* fall back to C.
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*/
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#define MAX_PASSES (10)
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/* A pass with a vector.
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*/
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typedef struct {
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int first; /* The index of the first mask coff we use */
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int last; /* The index of the last mask coff we use */
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/* The code we generate for this section of this mask.
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*/
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VipsVector *vector;
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} Pass;
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/* Our parameters.
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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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INTMASK *mask; /* Copy of mask arg */
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MorphOp op;
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/* The passes we generate for this mask.
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*/
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int n_pass;
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Pass pass[MAX_PASSES];
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} Morph;
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static void
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pass_free( Morph *morph )
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{
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int i;
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for( i = 0; i < morph->n_pass; i++ )
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IM_FREEF( vips_vector_free, morph->pass[i].vector );
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morph->n_pass = 0;
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}
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static int
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morph_close( Morph *morph )
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{
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IM_FREEF( im_free_imask, morph->mask );
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pass_free( morph );
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return( 0 );
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}
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#define TEMP( N, S ) vips_vector_temporary( v, N, S )
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#define SRC( N, P, S ) vips_vector_source( v, N, P, S )
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#define CONST( N, V, S ) vips_vector_constant( v, N, V, S )
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#define ASM2( OP, A, B ) vips_vector_asm2( v, OP, A, B )
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#define ASM3( OP, A, B, C ) vips_vector_asm3( v, OP, A, B, C )
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/* Generate code for a section of the mask. first is the index we start
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* at, we set last to the index of the last one we use before we run
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* out of intermediates / constants / parameters / sources or mask
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* coefficients.
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*
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* 0 for success, -1 on error.
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*/
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static int
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pass_compile_section( Morph *morph, int first, int *last )
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{
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INTMASK *mask = morph->mask;
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const int n_mask = mask->xsize * mask->ysize;
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Pass *pass;
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VipsVector *v;
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char offset[256];
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char source[256];
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char zero[256];
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char one[256];
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int i;
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/* Skip any don't-care coefficients at the start of the mask region.
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*/
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for( ; mask->coeff[first] == 128 && first < n_mask; first++ )
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;
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if( first == n_mask )
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return( 0 );
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/* Allocate space for another pass.
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*/
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if( morph->n_pass == MAX_PASSES )
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return( -1 );
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pass = &morph->pass[morph->n_pass];
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morph->n_pass += 1;
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pass->first = first;
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/* Start with a single source scanline, we add more as we need them.
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*/
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pass->vector = v = vips_vector_new_ds( "morph", 1, 1 );
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/* The value we fetch from the image,
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* the accumulated sum.
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*/
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TEMP( "value", 1 );
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TEMP( "sum", 1 );
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CONST( zero, 0, 1 );
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CONST( one, 255, 1 );
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/* Init the sum. If this is the first pass, it's a constant. If this
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* is a later pass, we have to init the sum from the result
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* of the previous pass.
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*/
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if( morph->n_pass == 1 ) {
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if( morph->op == DILATE )
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ASM2( "copyb", "sum", zero );
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else
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ASM2( "copyb", "sum", one );
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}
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else {
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/* "r" is the result of the previous pass.
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*/
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vips_vector_source_name( v, "r", 1 );
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ASM2( "loadb", "sum", "r" );
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}
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for( i = first; i < n_mask; i++ ) {
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int x = i % mask->xsize;
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int y = i / mask->xsize;
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/* Exclude don't-care elements.
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*/
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if( mask->coeff[i] == 128 )
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continue;
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/* The source. s1 is the first scanline in the mask.
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*/
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vips_vector_source( v, source, y + 1, 1 );
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/* The offset, only for non-first-columns though.
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*/
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if( x > 0 ) {
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CONST( offset, morph->in->Bands * x, 1 );
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ASM3( "loadoffb", "value", source, offset );
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}
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else
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ASM2( "loadb", "value", source );
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/* Join to our sum. If the mask element is zero, we have to
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* add an extra negate.
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*/
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if( morph->op == DILATE ) {
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if( !mask->coeff[i] )
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ASM3( "xorb", "value", "value", one );
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ASM3( "orb", "sum", "sum", "value" );
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}
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else {
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if( !mask->coeff[i] )
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ASM3( "andnb", "sum", "sum", "value" );
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else
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ASM3( "andb", "sum", "sum", "value" );
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}
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if( vips_vector_full( v ) )
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break;
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}
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pass->last = i;
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*last = i;
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ASM2( "copyb", "d1", "sum" );
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if( !vips_vector_compile( v ) )
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return( -1 );
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#ifdef DEBUG
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printf( "done matrix coeffs %d to %d\n", pass->first, pass->last );
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vips_vector_print( v );
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#endif /*DEBUG*/
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return( 0 );
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}
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/* Generate a set of passes.
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*/
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static int
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pass_compile( Morph *morph )
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{
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INTMASK *mask = morph->mask;
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const int n_mask = mask->xsize * mask->ysize;
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int i;
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#ifdef DEBUG
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printf( "morph: generating vector code\n" );
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#endif /*DEBUG*/
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/* Generate passes until we've used up the whole mask.
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*/
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for( i = 0;;) {
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int last;
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if( pass_compile_section( morph, i, &last ) )
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return( -1 );
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i = last + 1;
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if( i >= n_mask )
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break;
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}
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return( 0 );
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}
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static Morph *
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morph_new( IMAGE *in, IMAGE *out, INTMASK *mask, MorphOp op )
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{
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const int n_mask = mask->xsize * mask->ysize;
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Morph *morph;
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int i;
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if( im_piocheck( in, out ) ||
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im_check_uncoded( "morph", in ) ||
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im_check_format( "morph", in, IM_BANDFMT_UCHAR ) ||
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im_check_imask( "morph", mask ) )
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return( NULL );
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for( i = 0; i < n_mask; i++ )
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if( mask->coeff[i] != 0 &&
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mask->coeff[i] != 128 &&
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mask->coeff[i] != 255 ) {
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im_error( "morph",
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_( "bad mask element (%d "
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"should be 0, 128 or 255)" ),
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mask->coeff[i] );
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return( NULL );
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}
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if( !(morph = IM_NEW( out, Morph )) )
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return( NULL );
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morph->in = in;
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morph->out = out;
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morph->mask = NULL;
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morph->op = op;
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morph->n_pass = 0;
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for( i = 0; i < MAX_PASSES; i++ )
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morph->pass[i].vector = NULL;
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if( im_add_close_callback( out,
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(im_callback_fn) morph_close, morph, NULL ) ||
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!(morph->mask = im_dup_imask( mask, "morph" )) )
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return( NULL );
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/* Generate code for this mask / image, if possible.
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*/
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if( vips_vector_get_enabled() ) {
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if( pass_compile( morph ) )
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pass_free( morph );
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}
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return( morph );
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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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Morph *morph;
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REGION *ir; /* Input region */
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int *soff; /* Offsets we check for set */
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int ss; /* ... and number we check for set */
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int *coff; /* Offsets we check for clear */
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int cs; /* ... and number we check for clear */
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int last_bpl; /* Avoid recalcing offsets, if we can */
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/* In vector mode we need a pair of intermediate buffers to keep the
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* results of each pass in.
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*/
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void *t1;
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void *t2;
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} MorphSequence;
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/* Free a sequence value.
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*/
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static int
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morph_stop( void *vseq, void *a, void *b )
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{
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MorphSequence *seq = (MorphSequence *) vseq;
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IM_FREEF( im_region_free, seq->ir );
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IM_FREE( seq->t1 );
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IM_FREE( seq->t2 );
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return( 0 );
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}
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/* Morph start function.
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*/
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static void *
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morph_start( IMAGE *out, void *a, void *b )
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{
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IMAGE *in = (IMAGE *) a;
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Morph *morph = (Morph *) b;
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int n_mask = morph->mask->xsize * morph->mask->ysize;
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int sz = IM_IMAGE_N_ELEMENTS( in );
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MorphSequence *seq;
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if( !(seq = IM_NEW( out, MorphSequence )) )
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return( NULL );
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/* Init!
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*/
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seq->morph = morph;
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seq->ir = NULL;
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seq->soff = NULL;
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seq->ss = 0;
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seq->coff = NULL;
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seq->cs = 0;
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seq->last_bpl = -1;
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seq->t1 = NULL;
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seq->t2 = 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->soff = IM_ARRAY( out, n_mask, int );
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seq->coff = IM_ARRAY( out, n_mask, int );
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seq->t1 = IM_ARRAY( NULL, sz, PEL );
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seq->t2 = IM_ARRAY( NULL, sz, PEL );
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if( !seq->ir || !seq->soff || !seq->coff || !seq->t1 || !seq->t2 ) {
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morph_stop( seq, in, NULL );
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return( NULL );
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}
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return( seq );
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}
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/* Dilate!
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*/
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static int
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dilate_gen( REGION *or, void *vseq, void *a, void *b )
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{
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MorphSequence *seq = (MorphSequence *) vseq;
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Morph *morph = (Morph *) b;
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INTMASK *mask = morph->mask;
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REGION *ir = seq->ir;
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int *soff = seq->soff;
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int *coff = seq->coff;
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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 *t;
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int x, y;
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int result, 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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/* Scan mask, building offsets we check when processing. Only do this
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* if the bpl has changed since the previous im_prepare().
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*/
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if( seq->last_bpl != IM_REGION_LSKIP( ir ) ) {
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seq->last_bpl = IM_REGION_LSKIP( ir );
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seq->ss = 0;
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seq->cs = 0;
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for( t = mask->coeff, y = 0; y < mask->ysize; y++ )
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for( x = 0; x < mask->xsize; x++, t++ )
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switch( *t ) {
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case 255:
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soff[seq->ss++] =
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IM_REGION_ADDR( ir,
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x + le, y + to ) -
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IM_REGION_ADDR( ir, le, to );
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break;
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case 128:
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break;
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case 0:
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coff[seq->cs++] =
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IM_REGION_ADDR( ir,
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x + le, y + to ) -
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IM_REGION_ADDR( ir, le, to );
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break;
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default:
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g_assert( 0 );
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}
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}
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/* Dilate!
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*/
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for( y = to; y < bo; y++ ) {
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PEL *p = (PEL *) IM_REGION_ADDR( ir, le, y );
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PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
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/* Loop along line.
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*/
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for( x = 0; x < sz; x++, q++, p++ ) {
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/* Search for a hit on the set list.
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*/
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result = 0;
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for( i = 0; i < seq->ss; i++ )
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if( p[soff[i]] ) {
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/* Found a match!
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*/
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result = 255;
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break;
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}
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/* No set pixels ... search for a hit in the clear
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* pixels.
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*/
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if( !result )
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for( i = 0; i < seq->cs; i++ )
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if( !p[coff[i]] ) {
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/* Found a match!
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*/
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result = 255;
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break;
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}
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*q = result;
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}
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}
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return( 0 );
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}
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/* Erode!
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*/
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static int
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erode_gen( REGION *or, void *vseq, void *a, void *b )
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{
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MorphSequence *seq = (MorphSequence *) vseq;
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INTMASK *msk = (INTMASK *) b;
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REGION *ir = seq->ir;
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int *soff = seq->soff;
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int *coff = seq->coff;
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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 *t;
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int x, y;
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int result, 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 += msk->xsize - 1;
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s.height += msk->ysize - 1;
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if( im_prepare( ir, &s ) )
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return( -1 );
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|
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#ifdef DEBUG
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printf( "erode_gen: preparing %dx%d pixels\n", s.width, s.height );
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#endif /*DEBUG*/
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|
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/* Scan mask, building offsets we check when processing. Only do this
|
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* if the bpl has changed since the previous im_prepare().
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*/
|
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if( seq->last_bpl != IM_REGION_LSKIP( ir ) ) {
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seq->last_bpl = IM_REGION_LSKIP( ir );
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|
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seq->ss = 0;
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seq->cs = 0;
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for( t = msk->coeff, y = 0; y < msk->ysize; y++ )
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for( x = 0; x < msk->xsize; x++, t++ )
|
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switch( *t ) {
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case 255:
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soff[seq->ss++] =
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IM_REGION_ADDR( ir,
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|
x + le, y + to ) -
|
|
IM_REGION_ADDR( ir, le, to );
|
|
break;
|
|
|
|
case 128:
|
|
break;
|
|
|
|
case 0:
|
|
coff[seq->cs++] =
|
|
IM_REGION_ADDR( ir,
|
|
x + le, y + to ) -
|
|
IM_REGION_ADDR( ir, le, to );
|
|
break;
|
|
|
|
default:
|
|
g_assert( 0 );
|
|
}
|
|
}
|
|
|
|
/* Erode!
|
|
*/
|
|
for( y = to; y < bo; y++ ) {
|
|
PEL *p = (PEL *) IM_REGION_ADDR( ir, le, y );
|
|
PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
|
|
|
|
/* Loop along line.
|
|
*/
|
|
for( x = 0; x < sz; x++, q++, p++ ) {
|
|
/* Check all set pixels are set.
|
|
*/
|
|
result = 255;
|
|
for( i = 0; i < seq->ss; i++ )
|
|
if( !p[soff[i]] ) {
|
|
/* Found a mismatch!
|
|
*/
|
|
result = 0;
|
|
break;
|
|
}
|
|
|
|
/* Check all clear pixels are clear.
|
|
*/
|
|
if( result )
|
|
for( i = 0; i < seq->cs; i++ )
|
|
if( p[coff[i]] ) {
|
|
result = 0;
|
|
break;
|
|
}
|
|
|
|
*q = result;
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
pass_run( Morph *morph, Pass *pass, VipsExecutor *executor,
|
|
REGION *ir, void *t1, void *t2, int x, int y )
|
|
{
|
|
INTMASK *mask = morph->mask;
|
|
int top = pass->first / mask->xsize;
|
|
int bottom = pass->last / mask->xsize;
|
|
|
|
PEL *p = (PEL *) IM_REGION_ADDR( ir, x, y );
|
|
int lsk = IM_REGION_LSKIP( ir );
|
|
|
|
int i;
|
|
|
|
/* Generate all the scanline pointers this prog needs.
|
|
*/
|
|
for( i = top; i <= bottom; i++ )
|
|
vips_executor_set_source( executor, i + 1, p + i * lsk );
|
|
|
|
/* It might need the result from a previous pass.
|
|
*/
|
|
vips_executor_set_array( executor, "r", t1 );
|
|
|
|
vips_executor_set_array( executor, "d1", t2 );
|
|
|
|
vips_executor_run( executor );
|
|
}
|
|
|
|
/* The vector codepath.
|
|
*/
|
|
static int
|
|
morph_vector_gen( REGION *or, void *vseq, void *a, void *b )
|
|
{
|
|
MorphSequence *seq = (MorphSequence *) vseq;
|
|
Morph *morph = (Morph *) b;
|
|
INTMASK *mask = morph->mask;
|
|
REGION *ir = seq->ir;
|
|
Rect *r = &or->valid;
|
|
int sz = IM_REGION_N_ELEMENTS( or );
|
|
|
|
Rect s;
|
|
int y, j;
|
|
VipsExecutor executor[MAX_PASSES];
|
|
|
|
/* Prepare the section of the input image we need. A little larger
|
|
* than the section of the output image we are producing.
|
|
*/
|
|
s = *r;
|
|
s.width += mask->xsize - 1;
|
|
s.height += mask->ysize - 1;
|
|
if( im_prepare( ir, &s ) )
|
|
return( -1 );
|
|
|
|
for( j = 0; j < morph->n_pass; j++ )
|
|
vips_executor_set_program( &executor[j],
|
|
morph->pass[j].vector, sz );
|
|
|
|
for( y = 0; y < r->height; y++ ) {
|
|
for( j = 0; j < morph->n_pass; j++ ) {
|
|
void *d;
|
|
|
|
/* The last pass goes to the output image,
|
|
* intermediate passes go to t2.
|
|
*/
|
|
if( j == morph->n_pass - 1 )
|
|
d = IM_REGION_ADDR( or, r->left, r->top + y );
|
|
else
|
|
d = seq->t2;
|
|
|
|
pass_run( morph, &morph->pass[j], &executor[j],
|
|
ir, seq->t1, d, r->left, r->top + y );
|
|
|
|
IM_SWAP( void *, seq->t1, seq->t2 );
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/* Morph an image.
|
|
*/
|
|
static int
|
|
morphology( IMAGE *in, IMAGE *out, INTMASK *mask, MorphOp op )
|
|
{
|
|
Morph *morph;
|
|
im_generate_fn generate;
|
|
|
|
/* Check parameters.
|
|
*/
|
|
if( !(morph = morph_new( in, out, mask, op )) )
|
|
return( -1 );
|
|
|
|
/* Prepare output. Consider a 7x7 mask and a 7x7 image --- the output
|
|
* would be 1x1.
|
|
*/
|
|
if( im_cp_desc( out, in ) )
|
|
return( -1 );
|
|
out->Xsize -= mask->xsize - 1;
|
|
out->Ysize -= mask->ysize - 1;
|
|
if( out->Xsize <= 0 || out->Ysize <= 0 ) {
|
|
im_error( "morph", "%s", _( "image too small for mask" ) );
|
|
return( -1 );
|
|
}
|
|
|
|
if( morph->n_pass ) {
|
|
generate = morph_vector_gen;
|
|
|
|
#ifdef DEBUG
|
|
printf( "morph_vector_gen: %d passes\n", morph->n_pass );
|
|
#endif /*DEBUG*/
|
|
}
|
|
else if( op == DILATE )
|
|
generate = dilate_gen;
|
|
else
|
|
generate = erode_gen;
|
|
|
|
/* Set demand hints. FATSTRIP is good for us, as THINSTRIP will cause
|
|
* too many recalculations on overlaps.
|
|
*/
|
|
if( im_demand_hint( out, IM_FATSTRIP, in, NULL ) ||
|
|
im_generate( out,
|
|
morph_start, generate, morph_stop, in, morph ) )
|
|
return( -1 );
|
|
|
|
out->Xoffset = -mask->xsize / 2;
|
|
out->Yoffset = -mask->ysize / 2;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int
|
|
im_dilate_raw( IMAGE *in, IMAGE *out, INTMASK *mask )
|
|
{
|
|
return( morphology( in, out, mask, DILATE ) );
|
|
}
|
|
|
|
int
|
|
im_erode_raw( IMAGE *in, IMAGE *out, INTMASK *mask )
|
|
{
|
|
return( morphology( in, out, mask, ERODE ) );
|
|
}
|
|
|
|
/**
|
|
* im_dilate:
|
|
* @in: input image
|
|
* @out: output image
|
|
* @mask: mask
|
|
*
|
|
* Operations are performed using the processor's vector unit,
|
|
* if possible. Disable this with --vips-novector or IM_NOVECTOR.
|
|
*
|
|
* See also:
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
im_dilate( IMAGE *in, IMAGE *out, INTMASK *mask )
|
|
{
|
|
IMAGE *t1 = im_open_local( out, "im_dilate:1", "p" );
|
|
|
|
if( !t1 ||
|
|
im_embed( in, t1, 1, mask->xsize / 2, mask->ysize / 2,
|
|
in->Xsize + mask->xsize - 1,
|
|
in->Ysize + mask->ysize - 1 ) ||
|
|
morphology( in, out, mask, DILATE ) )
|
|
return( -1 );
|
|
|
|
out->Xoffset = 0;
|
|
out->Yoffset = 0;
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/**
|
|
* im_erode:
|
|
* @in: input image
|
|
* @out: output image
|
|
* @mask: mask
|
|
*
|
|
* Operations are performed using the processor's vector unit,
|
|
* if possible. Disable this with --vips-novector or IM_NOVECTOR.
|
|
*
|
|
* See also:
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
im_erode( IMAGE *in, IMAGE *out, INTMASK *mask )
|
|
{
|
|
IMAGE *t1 = im_open_local( out, "im_erode:1", "p" );
|
|
|
|
if( !t1 ||
|
|
im_embed( in, t1, 1, mask->xsize / 2, mask->ysize / 2,
|
|
in->Xsize + mask->xsize - 1,
|
|
in->Ysize + mask->ysize - 1 ) ||
|
|
morphology( in, out, mask, ERODE ) )
|
|
return( -1 );
|
|
|
|
out->Xoffset = 0;
|
|
out->Yoffset = 0;
|
|
|
|
return( 0 );
|
|
}
|