558 lines
23 KiB
C
558 lines
23 KiB
C
/* @(#) Like im_spcor(), but with a new metric.
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* @(#)
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* @(#) takes the gradient images of the two images, and takes the dot-product
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* @(#) correlation of the two vector images.
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* @(#)
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* @(#) (vector images are never really used, the two components are
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* @(#) calculated separately)
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* @(#)
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* @(#) The vector expression of this method is my (tcv) own creation. It is
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* @(#) equivalent to the complex-number method of:
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* @(#)
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* @(#) ARGYRIOU, V. et al. 2003. Estimation of sub-pixel motion using
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* @(#) gradient cross correlation. Electronics Letters, 39 (13).
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* @(#)
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* @(#) It's suitability for sub-pixel alignment is not (yet) tested.
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*
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* Copyright: 2007 Nottingham Trent University
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*
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* Author: Tom Vajzovic
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* Written on: 2007-06-07
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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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/** HEADERS **/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdlib.h>
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#include <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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/** LOCAL TYPES **/
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typedef struct {
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REGION *reg;
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int *region_xgrad;
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int *region_ygrad;
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size_t region_xgrad_area;
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size_t region_ygrad_area;
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}
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gradcor_seq_t;
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/** LOCAL FUNCTION DECLARATIONS **/
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static void *gradcor_start( IMAGE *out, void *vptr_large, void *unrequired );
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static int gradcor_stop( void *vptr_seq, void *unrequired, void *unreq2 );
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static int gradcor_gen( REGION *to_make, void *vptr_seq, void *unrequired, void *vptr_grads );
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#define XGRAD_GEN_DECLARATION( TYPE ) static int xgrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 )
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#define YGRAD_GEN_DECLARATION( TYPE ) static int ygrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 )
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XGRAD_GEN_DECLARATION( guint8 );
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YGRAD_GEN_DECLARATION( guint8 );
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XGRAD_GEN_DECLARATION( gint8 );
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YGRAD_GEN_DECLARATION( gint8 );
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XGRAD_GEN_DECLARATION( guint16 );
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YGRAD_GEN_DECLARATION( guint16 );
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XGRAD_GEN_DECLARATION( gint16 );
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YGRAD_GEN_DECLARATION( gint16 );
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XGRAD_GEN_DECLARATION( guint32 );
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YGRAD_GEN_DECLARATION( guint32 );
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XGRAD_GEN_DECLARATION( gint32 );
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YGRAD_GEN_DECLARATION( gint32 );
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#if 0
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XGRAD_GEN_DECLARATION( float );
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YGRAD_GEN_DECLARATION( float );
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XGRAD_GEN_DECLARATION( double );
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YGRAD_GEN_DECLARATION( double );
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#endif
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/** EXPORTED FUNCTION DEFINITIONS **/
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int
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im_gradcor( IMAGE *in, IMAGE *ref, IMAGE *out )
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{
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#define FUNCTION_NAME "im_gradcor"
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IMAGE *t1 = im_open_local( out, FUNCTION_NAME " intermediate", "p" );
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if( !t1 ||
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im_embed( in, t1, 1,
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ref->Xsize / 2, ref->Ysize / 2,
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in->Xsize + ref->Xsize - 1,
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in->Ysize + ref->Ysize - 1 ) ||
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im_gradcor_raw( t1, ref, out ) )
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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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#undef FUNCTION_NAME
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}
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int im_gradcor_raw( IMAGE *large, IMAGE *small, IMAGE *out ){
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#define FUNCTION_NAME "im_gradcor_raw"
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if( im_piocheck( large, out ) || im_pincheck( small ) )
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return -1;
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if( ! im_isint( large ) || ! im_isint( small ) ){
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im_error( FUNCTION_NAME, "image does not have integer band format" );
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return -1;
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}
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if( large-> Coding || small-> Coding ){
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im_error( FUNCTION_NAME, "image is not uncoded" );
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return -1;
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}
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if( 1 != large-> Bands || 1 != small-> Bands ){
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im_error( FUNCTION_NAME, "image is multi-band" );
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return -1;
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}
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if( large-> Xsize < small-> Xsize || large-> Ysize < small-> Ysize ){
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im_error( FUNCTION_NAME, "second image must be smaller than first" );
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return -1;
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}
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if( im_cp_desc( out, large ) )
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return -1;
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out-> Xsize= 1 + large-> Xsize - small-> Xsize;
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out-> Ysize= 1 + large-> Ysize - small-> Ysize;
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out-> BandFmt= IM_BANDFMT_FLOAT;
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out-> Bbits= IM_BBITS_FLOAT;
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if( im_demand_hint( out, IM_FATSTRIP, large, NULL ) )
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return -1;
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{
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IMAGE *xgrad= im_open_local( out, FUNCTION_NAME ": xgrad", "t" );
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IMAGE *ygrad= im_open_local( out, FUNCTION_NAME ": ygrad", "t" );
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IMAGE **grads= im_allocate_input_array( out, xgrad, ygrad, NULL );
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return ! xgrad || ! ygrad || ! grads
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|| im_grad_x( small, xgrad )
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|| im_grad_y( small, ygrad )
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|| im_generate( out, gradcor_start, gradcor_gen, gradcor_stop, (void*) large, (void*) grads );
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}
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#undef FUNCTION_NAME
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}
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int im_grad_x( IMAGE *in, IMAGE *out ){
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#define FUNCTION_NAME "im_grad_x"
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if( im_piocheck( in, out ) )
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return -1;
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if( ! im_isint( in ) ){
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im_error( FUNCTION_NAME, "image does not have integer band format" );
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return -1;
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}
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if( in-> Coding ){
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im_error( FUNCTION_NAME, "image is not uncoded" );
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return -1;
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}
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if( 1 != in-> Bands ){
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im_error( FUNCTION_NAME, "image is multi-band" );
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return -1;
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}
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if( im_cp_desc( out, in ) )
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return -1;
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-- out-> Xsize;
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out-> BandFmt= IM_BANDFMT_INT; /* do not change without updating im_gradcor() */
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out-> Bbits= IM_BBITS_INT;
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if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
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return -1;
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#define RETURN_GENERATE( TYPE ) return im_generate( out, im_start_one, xgrad_gen_ ## TYPE, im_stop_one, (void*) in, NULL )
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switch( in-> BandFmt ){
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case IM_BANDFMT_UCHAR:
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RETURN_GENERATE( guint8 );
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case IM_BANDFMT_CHAR:
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RETURN_GENERATE( gint8 );
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case IM_BANDFMT_USHORT:
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RETURN_GENERATE( guint16 );
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case IM_BANDFMT_SHORT:
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RETURN_GENERATE( gint16 );
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case IM_BANDFMT_UINT:
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RETURN_GENERATE( guint32 );
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case IM_BANDFMT_INT:
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RETURN_GENERATE( gint32 );
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#if 0
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case IM_BANDFMT_FLOAT:
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RETURN_GENERATE( float );
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case IM_BANDFMT_DOUBLE:
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RETURN_GENERATE( double );
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#endif
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#undef RETURN_GENERATE
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}
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/* Keep gcc happy.
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*/
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return 0;
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#undef FUNCTION_NAME
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}
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int im_grad_y( IMAGE *in, IMAGE *out ){
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#define FUNCTION_NAME "im_grad_y"
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if( im_piocheck( in, out ) )
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return -1;
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if( ! im_isint( in ) ){
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im_error( FUNCTION_NAME, "image does not have integer band format" );
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return -1;
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}
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if( in-> Coding ){
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im_error( FUNCTION_NAME, "image is not uncoded" );
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return -1;
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}
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if( 1 != in-> Bands ){
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im_error( FUNCTION_NAME, "image is multi-band" );
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return -1;
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}
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if( im_cp_desc( out, in ) )
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return -1;
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-- out-> Ysize;
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out-> BandFmt= IM_BANDFMT_INT; /* do not change without updating im_gradcor() */
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out-> Bbits= IM_BBITS_INT;
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if( im_demand_hint( out, IM_FATSTRIP, in, NULL ) )
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return -1;
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#define RETURN_GENERATE( TYPE ) return im_generate( out, im_start_one, ygrad_gen_ ## TYPE, im_stop_one, (void*) in, NULL )
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switch( in-> BandFmt ){
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case IM_BANDFMT_UCHAR:
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RETURN_GENERATE( guint8 );
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case IM_BANDFMT_CHAR:
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RETURN_GENERATE( gint8 );
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case IM_BANDFMT_USHORT:
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RETURN_GENERATE( guint16 );
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case IM_BANDFMT_SHORT:
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RETURN_GENERATE( gint16 );
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case IM_BANDFMT_UINT:
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RETURN_GENERATE( guint32 );
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case IM_BANDFMT_INT:
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RETURN_GENERATE( gint32 );
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#if 0
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case IM_BANDFMT_FLOAT:
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RETURN_GENERATE( float );
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case IM_BANDFMT_DOUBLE:
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RETURN_GENERATE( double );
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#endif
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#undef RETURN_GENERATE
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}
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/* Keep gcc happy.
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*/
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return 0;
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#undef FUNCTION_NAME
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}
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/** LOCAL FUNCTION DEFINITIONS **/
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static void *gradcor_start( IMAGE *out, void *vptr_large, void *unrequired ){
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gradcor_seq_t *seq= IM_NEW( NULL, gradcor_seq_t );
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if( ! seq )
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return NULL;
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seq-> region_xgrad= (int*) NULL;
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seq-> region_ygrad= (int*) NULL;
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seq-> region_xgrad_area= 0;
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seq-> region_ygrad_area= 0;
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seq-> reg= im_region_create( (IMAGE*) vptr_large );
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if( ! seq-> reg ){
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im_free( (void*) seq );
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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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static int gradcor_stop( void *vptr_seq, void *unrequired, void *unreq2 ){
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gradcor_seq_t *seq= (gradcor_seq_t*) vptr_seq;
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if( seq ){
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im_free( (void*) seq-> region_xgrad );
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im_free( (void*) seq-> region_ygrad );
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im_region_free( seq-> reg );
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seq-> region_xgrad= (int*) NULL;
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seq-> region_ygrad= (int*) NULL;
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seq-> reg= (REGION*) NULL;
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im_free( (void*) seq );
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}
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return 0;
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}
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static int gradcor_gen( REGION *to_make, void *vptr_seq, void *unrequired, void *vptr_grads ){
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gradcor_seq_t *seq= (gradcor_seq_t*) vptr_seq;
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REGION *make_from= seq-> reg;
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IMAGE **grads= (IMAGE**) vptr_grads;
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IMAGE *small_xgrad= grads[0];
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IMAGE *small_ygrad= grads[1];
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Rect require= {
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to_make-> valid. left,
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to_make-> valid. top,
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to_make-> valid. width + small_xgrad-> Xsize,
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to_make-> valid. height + small_ygrad-> Ysize
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};
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size_t region_xgrad_width= require. width - 1;
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size_t region_ygrad_height= require. height - 1;
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if( im_prepare( make_from, &require ) )
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return -1;
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#define FILL_BUFFERS( TYPE ) /* fill region_xgrad */ \
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{ \
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TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
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size_t read_skip= ( IM_REGION_LSKIP( make_from ) / sizeof(TYPE) ) - region_xgrad_width; \
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size_t area_need= region_xgrad_width * require. height; \
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\
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if( seq-> region_xgrad_area < area_need ){ \
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free( seq-> region_xgrad ); \
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seq-> region_xgrad= malloc( area_need * sizeof(int) ); \
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if( ! seq-> region_xgrad ) \
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return -1; \
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seq-> region_xgrad_area= area_need; \
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} \
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{ \
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int *writing= seq-> region_xgrad; \
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int *write_end= writing + area_need; \
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int *write_stop; \
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for( ; writing < write_end; reading+= read_skip ) \
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for( write_stop= writing + region_xgrad_width; writing < write_stop; ++reading, ++writing ) \
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*writing= reading[1] - reading[0]; \
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} \
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} \
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{ /* fill region_ygrad */ \
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TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
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size_t read_line= IM_REGION_LSKIP( make_from ) / sizeof(TYPE); \
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size_t read_skip= read_line - require. width; \
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size_t area_need= require. width * region_ygrad_height; \
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\
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if( seq-> region_ygrad_area < area_need ){ \
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free( seq-> region_ygrad ); \
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seq-> region_ygrad= malloc( area_need * sizeof(int) ); \
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if( ! seq-> region_ygrad ) \
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return -1; \
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seq-> region_ygrad_area= area_need; \
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} \
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{ \
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int *writing= seq-> region_ygrad; \
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int *write_end= writing + area_need; \
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int *write_stop; \
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for( ; writing < write_end; reading+= read_skip ) \
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for( write_stop= writing + require. width; writing < write_stop; ++reading, ++writing ) \
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*writing= reading[ read_line ] - reading[0]; \
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} \
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}
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switch( make_from-> im-> BandFmt ){
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case IM_BANDFMT_UCHAR:
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FILL_BUFFERS( unsigned char )
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break;
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case IM_BANDFMT_CHAR:
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FILL_BUFFERS( signed char )
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break;
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case IM_BANDFMT_USHORT:
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FILL_BUFFERS( unsigned short int )
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break;
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case IM_BANDFMT_SHORT:
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FILL_BUFFERS( signed short int )
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break;
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case IM_BANDFMT_UINT:
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FILL_BUFFERS( unsigned int )
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break;
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case IM_BANDFMT_INT:
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FILL_BUFFERS( signed int )
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break;
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}
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{ /* write to output */
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size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof( float );
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float *writing= (float*) IM_REGION_ADDR_TOPLEFT( to_make );
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float *write_end= writing + write_skip * to_make-> valid. height;
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float *write_stop;
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size_t write_width= to_make-> valid. width;
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size_t small_xgrad_width= small_xgrad-> Xsize;
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size_t small_ygrad_width= small_ygrad-> Xsize;
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int *small_xgrad_end= (int*) small_xgrad-> data + small_xgrad_width * small_xgrad-> Ysize;
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int *small_ygrad_end= (int*) small_ygrad-> data + small_ygrad_width * small_ygrad-> Ysize;
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int *region_xgrad_start= seq-> region_xgrad;
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int *region_ygrad_start= seq-> region_ygrad;
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size_t region_xgrad_start_skip= region_xgrad_width - write_width;
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size_t region_ygrad_start_skip= require. width - write_width;
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size_t region_xgrad_read_skip= region_xgrad_width - small_xgrad_width;
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size_t region_ygrad_read_skip= require. width - small_ygrad_width;
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write_skip-= write_width;
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for( ; writing < write_end; writing+= write_skip, region_xgrad_start+= region_xgrad_start_skip, region_ygrad_start+= region_ygrad_start_skip )
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for( write_stop= writing + write_width; writing < write_stop; ++writing, ++region_xgrad_start, ++region_ygrad_start ){
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gint64 sum= 0;
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{
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int *small_xgrad_read= (int*) small_xgrad-> data;
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int *small_xgrad_stop;
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int *region_xgrad_read= region_xgrad_start;
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for( ; small_xgrad_read < small_xgrad_end; region_xgrad_read+= region_xgrad_read_skip )
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for( small_xgrad_stop= small_xgrad_read + small_xgrad_width; small_xgrad_read < small_xgrad_stop; ++small_xgrad_read, ++region_xgrad_read )
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sum+= *small_xgrad_read * *region_xgrad_read;
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}
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{
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int *small_ygrad_read= (int*) small_ygrad-> data;
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int *small_ygrad_stop;
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int *region_ygrad_read= region_ygrad_start;
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for( ; small_ygrad_read < small_ygrad_end; region_ygrad_read+= region_ygrad_read_skip )
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for( small_ygrad_stop= small_ygrad_read + small_ygrad_width; small_ygrad_read < small_ygrad_stop; ++small_ygrad_read, ++region_ygrad_read )
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sum+= *small_ygrad_read * *region_ygrad_read;
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}
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*writing= sum;
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}
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}
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return 0;
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}
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#define XGRAD_GEN_DEFINITION( TYPE ) \
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static int xgrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 ){ \
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\
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REGION *make_from= (REGION*) vptr_make_from; \
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Rect require= { \
|
|
to_make-> valid. left, \
|
|
to_make-> valid. top, \
|
|
to_make-> valid. width + 1, \
|
|
to_make-> valid. height \
|
|
}; \
|
|
if( im_prepare( make_from, &require ) ) \
|
|
return -1; \
|
|
\
|
|
{ \
|
|
int *writing= (int*) IM_REGION_ADDR_TOPLEFT( to_make ); \
|
|
size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof(int); \
|
|
int *write_end= writing + write_skip * to_make-> valid. height; \
|
|
size_t write_width= to_make-> valid. width; \
|
|
int *write_stop; \
|
|
\
|
|
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
|
|
size_t read_skip= ( IM_REGION_LSKIP( make_from ) / sizeof(TYPE) ) - write_width; \
|
|
\
|
|
write_skip-= write_width; \
|
|
\
|
|
for( ; writing < write_end; writing+= write_skip, reading+= read_skip ) \
|
|
for( write_stop= writing + write_width; writing < write_stop; ++writing, ++reading ) \
|
|
*writing= (int)( reading[1] - reading[0] ); \
|
|
} \
|
|
return 0; \
|
|
}
|
|
|
|
#define YGRAD_GEN_DEFINITION( TYPE ) \
|
|
static int ygrad_gen_ ## TYPE( REGION *to_make, void *vptr_make_from, void *unrequired, void *unreq2 ){ \
|
|
\
|
|
REGION *make_from= (REGION*) vptr_make_from; \
|
|
Rect require= { \
|
|
to_make-> valid. left, \
|
|
to_make-> valid. top, \
|
|
to_make-> valid. width, \
|
|
to_make-> valid. height + 1 \
|
|
}; \
|
|
if( im_prepare( make_from, &require ) ) \
|
|
return -1; \
|
|
\
|
|
{ \
|
|
int *writing= (int*) IM_REGION_ADDR_TOPLEFT( to_make ); \
|
|
size_t write_skip= IM_REGION_LSKIP( to_make ) / sizeof(int); \
|
|
int *write_end= writing + write_skip * to_make-> valid. height; \
|
|
size_t write_width= to_make-> valid. width; \
|
|
int *write_stop; \
|
|
\
|
|
TYPE *reading= (TYPE*) IM_REGION_ADDR( make_from, require. left, require. top ); \
|
|
size_t read_line= IM_REGION_LSKIP( make_from ) / sizeof(TYPE); \
|
|
size_t read_skip= read_line - write_width; \
|
|
\
|
|
write_skip-= write_width; \
|
|
\
|
|
for( ; writing < write_end; writing+= write_skip, reading+= read_skip ) \
|
|
for( write_stop= writing + write_width; writing < write_stop; ++writing, ++reading ) \
|
|
*writing= (int)( reading[ read_line ] - reading[0] ); \
|
|
} \
|
|
return 0; \
|
|
}
|
|
|
|
XGRAD_GEN_DEFINITION( guint8 )
|
|
YGRAD_GEN_DEFINITION( guint8 )
|
|
XGRAD_GEN_DEFINITION( gint8 )
|
|
YGRAD_GEN_DEFINITION( gint8 )
|
|
XGRAD_GEN_DEFINITION( guint16 )
|
|
YGRAD_GEN_DEFINITION( guint16 )
|
|
XGRAD_GEN_DEFINITION( gint16 )
|
|
YGRAD_GEN_DEFINITION( gint16 )
|
|
XGRAD_GEN_DEFINITION( guint32 )
|
|
YGRAD_GEN_DEFINITION( guint32 )
|
|
XGRAD_GEN_DEFINITION( gint32 )
|
|
YGRAD_GEN_DEFINITION( gint32 )
|
|
#if 0
|
|
XGRAD_GEN_DEFINITION( float )
|
|
YGRAD_GEN_DEFINITION( float )
|
|
XGRAD_GEN_DEFINITION( double )
|
|
YGRAD_GEN_DEFINITION( double )
|
|
#endif
|