libvips/libsrc/histograms_lut/im_project.c

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/* @(#) Find the horizontal and vertical projections of an image, ie. the sum
* @(#) of pixels in each row and column. Two output images, 1xheight and
* @(#) widthx1, with the largest required bandfmt.
* @(#)
* @(#) int im_project( in, columns, rows )
* @(#) IMAGE *in;
* @(#) IMAGE *columns, *rows;
* @(#)
* @(#) Returns 0 on success and -1 on error
*
* 20/4/06
* - from im_histgr()
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Accumulate a projection in one of these.
*/
typedef struct {
IMAGE *in;
IMAGE *hout;
IMAGE *vout;
void *columns;
void *rows;
} Project;
/* For each input bandfmt, the type we accumulate pixels in.
*/
static int project_type[] = {
IM_BANDFMT_UINT, /* IM_BANDFMT_UCHAR */
IM_BANDFMT_INT, /* IM_BANDFMT_CHAR */
IM_BANDFMT_UINT, /* IM_BANDFMT_USHORT */
IM_BANDFMT_INT, /* IM_BANDFMT_SHORT */
IM_BANDFMT_UINT, /* IM_BANDFMT_UINT */
IM_BANDFMT_INT, /* IM_BANDFMT_INT */
IM_BANDFMT_DOUBLE, /* IM_BANDFMT_FLOAT */
IM_BANDFMT_NOTSET, /* IM_BANDFMT_COMPLEX */
IM_BANDFMT_DOUBLE, /* IM_BANDFMT_DOUBLE */
IM_BANDFMT_NOTSET /* IM_BANDFMT_DPCOMPLEX */
};
static Project *
project_new( IMAGE *in, IMAGE *hout, IMAGE *vout )
{
Project *project;
int psize = IM_IMAGE_SIZEOF_PEL( hout );
if( !(project = IM_NEW( hout, Project )) )
return( NULL );
project->in = in;
project->hout = hout;
project->vout = vout;
project->columns = IM_ARRAY( hout, psize * in->Xsize, guchar );
project->rows = IM_ARRAY( hout, psize * in->Ysize, guchar );
if( !project->columns || !project->rows )
return( NULL );
memset( project->columns, 0, psize * in->Xsize );
memset( project->rows, 0, psize * in->Ysize );
return( project );
}
/* Build a sub-project, based on the main project.
*/
static void *
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project_new_sub( IMAGE *out, void *a, void *b )
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{
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Project *mproject = (Project *) a;
return( project_new( mproject->in, mproject->hout, mproject->vout ) );
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}
#define ADD_BUFFER( TYPE, Q, P, N ) { \
TYPE *p = (TYPE *) (P); \
TYPE *q = (TYPE *) (Q); \
int n = (N); \
int i; \
\
for( i = 0; i < n; i++ ) \
q[i] += p[i]; \
}
/* Join a sub-project onto the main project.
*/
static int
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project_merge( void *seq, void *a, void *b )
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{
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Project *sproject = (Project *) seq;
Project *mproject = (Project *) a;
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IMAGE *in = mproject->in;
IMAGE *out = mproject->hout;
int hsz = in->Xsize * in->Bands;
int vsz = in->Ysize * in->Bands;
assert( sproject->hout == mproject->hout );
assert( sproject->vout == mproject->vout );
/* Add on sub-data.
*/
switch( out->BandFmt ) {
case IM_BANDFMT_UINT:
ADD_BUFFER( guint, mproject->columns, sproject->columns, hsz );
ADD_BUFFER( guint, mproject->rows, sproject->rows, vsz );
break;
case IM_BANDFMT_INT:
ADD_BUFFER( int, mproject->columns, sproject->columns, hsz );
ADD_BUFFER( int, mproject->rows, sproject->rows, vsz );
break;
case IM_BANDFMT_DOUBLE:
ADD_BUFFER( double, mproject->columns, sproject->columns, hsz );
ADD_BUFFER( double, mproject->rows, sproject->rows, vsz );
break;
default:
assert( 0 );
}
/* Blank out sub-project to make sure we can't add it again.
*/
memset( sproject->columns, 0, IM_IMAGE_SIZEOF_ELEMENT( out ) * hsz );
memset( sproject->rows, 0, IM_IMAGE_SIZEOF_ELEMENT( out ) * vsz );
return( 0 );
}
/* Add an area of pixels.
*/
#define ADD_PIXELS( OUTTYPE, INTYPE ) { \
OUTTYPE *rows; \
OUTTYPE *columns; \
INTYPE *p; \
\
rows = ((OUTTYPE *) project->rows) + to * nb; \
for( y = 0; y < r->height; y++ ) { \
columns = ((OUTTYPE *) project->columns) + le * nb; \
p = (INTYPE *) IM_REGION_ADDR( reg, le, y + to ); \
\
for( x = 0; x < r->width; x++ ) { \
for( z = 0; z < nb; z++ ) { \
columns[z] += p[z]; \
rows[z] += p[z]; \
} \
\
p += nb; \
columns += nb; \
} \
\
rows += nb; \
} \
}
/* Add a region to a project.
*/
static int
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project_scan( REGION *reg, void *seq, void *a, void *b )
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{
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Project *project = (Project *) seq;
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Rect *r = &reg->valid;
int le = r->left;
int to = r->top;
int nb = project->in->Bands;
int x, y, z;
switch( project->in->BandFmt ) {
case IM_BANDFMT_UCHAR:
ADD_PIXELS( guint, guchar );
break;
case IM_BANDFMT_CHAR:
ADD_PIXELS( int, char );
break;
case IM_BANDFMT_USHORT:
ADD_PIXELS( guint, gushort );
break;
case IM_BANDFMT_SHORT:
ADD_PIXELS( int, short );
break;
case IM_BANDFMT_UINT:
ADD_PIXELS( guint, guint );
break;
case IM_BANDFMT_INT:
ADD_PIXELS( int, int );
break;
case IM_BANDFMT_FLOAT:
ADD_PIXELS( double, float );
break;
case IM_BANDFMT_DOUBLE:
ADD_PIXELS( double, double );
break;
default:
assert( 0 );
}
return( 0 );
}
int
im_project( IMAGE *in, IMAGE *hout, IMAGE *vout )
{
Project *mproject;
int y;
/* Check images. PIO from in, WIO to out.
*/
if( im_pincheck( in ) || im_outcheck( hout ) || im_outcheck( vout ) )
return( -1 );
if( in->Coding != IM_CODING_NONE ) {
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im_error( "im_project", "%s", _( "uncoded images only" ) );
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return( -1 );
}
if( im_iscomplex( in ) ) {
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im_error( "im_project", "%s", _( "non-complex images only" ) );
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return( -1 );
}
/* Make the output images.
*/
if( im_cp_desc( hout, in ) || im_cp_desc( vout, in ) )
return( -1 );
hout->Xsize = 1;
hout->BandFmt = project_type[in->BandFmt];
hout->Bbits = im_bits_of_fmt( hout->BandFmt );
hout->Type = IM_TYPE_HISTOGRAM;
vout->Ysize = 1;
vout->BandFmt = project_type[in->BandFmt];
vout->Bbits = im_bits_of_fmt( hout->BandFmt );
vout->Type = IM_TYPE_HISTOGRAM;
/* Build the main project we accumulate data in.
*/
if( !(mproject = project_new( in, hout, vout )) )
return( -1 );
/* Accumulate data.
*/
if( im_iterate( in,
project_new_sub, project_scan, project_merge, mproject, NULL ) )
return( -1 );
if( im_setupout( hout ) || im_setupout( vout ) )
return( -1 );
if( im_writeline( 0, vout, (PEL *) mproject->columns ) )
return( -1 );
for( y = 0; y < in->Ysize; y++ )
if( im_writeline( y, hout, (PEL *) mproject->rows +
y * IM_IMAGE_SIZEOF_PEL( hout ) ) )
return( -1 );
return( 0 );
}