236 lines
5.7 KiB
C
236 lines
5.7 KiB
C
/* im_ifthenelse.c --- use a condition image to join two images together
|
|
*
|
|
* Modified:
|
|
* 9/2/95 JC
|
|
* - partialed and ANSIfied
|
|
* 11/9/95 JC
|
|
* - return( 0 ) missing! oops
|
|
* 15/4/05
|
|
* - now just evals left/right if all zero/all one
|
|
* 7/10/06
|
|
* - set THINSTRIP
|
|
* 23/9/09
|
|
* - gtkdoc comment
|
|
* 23/9/09
|
|
* - use im_check*()
|
|
* - allow many-band conditional and single-band a/b
|
|
* - allow a/b to differ in format and bands
|
|
* 25/6/10
|
|
* - let the conditional image be any format by adding a (!=0) if
|
|
* necessary
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <vips/vips.h>
|
|
#include <vips/internal.h>
|
|
|
|
#ifdef WITH_DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif /*WITH_DMALLOC*/
|
|
|
|
static int
|
|
ifthenelse_gen( REGION *or, void *seq, void *client1, void *client2 )
|
|
{
|
|
REGION **ir = (REGION **) seq;
|
|
Rect *r = &or->valid;
|
|
int le = r->left;
|
|
int to = r->top;
|
|
int bo = IM_RECT_BOTTOM(r);
|
|
|
|
IMAGE *c = ir[0]->im;
|
|
IMAGE *a = ir[1]->im;
|
|
|
|
int size, width;
|
|
int i, x, y, z;
|
|
|
|
int all0, alln0;
|
|
|
|
if( c->Bands == 1 ) {
|
|
/* Copying PEL-sized units with a one-band conditional.
|
|
*/
|
|
size = IM_IMAGE_SIZEOF_PEL( a );
|
|
width = r->width;
|
|
}
|
|
else {
|
|
/* Copying ELEMENT sized-units with an n-band conditional.
|
|
*/
|
|
size = IM_IMAGE_SIZEOF_ELEMENT( a );
|
|
width = r->width * a->Bands;
|
|
}
|
|
|
|
if( im_prepare( ir[0], r ) )
|
|
return( -1 );
|
|
|
|
/* Is the conditional all zero or all non-zero? We can avoid asking
|
|
* for one of the inputs to be calculated.
|
|
*/
|
|
all0 = *((PEL *) IM_REGION_ADDR( ir[0], le, to )) == 0;
|
|
alln0 = *((PEL *) IM_REGION_ADDR( ir[0], le, to )) != 0;
|
|
for( y = to; y < bo; y++ ) {
|
|
PEL *p = (PEL *) IM_REGION_ADDR( ir[0], le, y );
|
|
|
|
for( x = 0; x < width; x++ ) {
|
|
all0 &= p[x] == 0;
|
|
alln0 &= p[x] != 0;
|
|
}
|
|
|
|
if( !all0 && !alln0 )
|
|
break;
|
|
}
|
|
|
|
if( alln0 ) {
|
|
/* All non-zero. Point or at the then image.
|
|
*/
|
|
if( im_prepare( ir[1], r ) ||
|
|
im_region_region( or, ir[1], r, r->left, r->top ) )
|
|
return( -1 );
|
|
}
|
|
else if( all0 ) {
|
|
/* All zero. Point or at the else image.
|
|
*/
|
|
if( im_prepare( ir[2], r ) ||
|
|
im_region_region( or, ir[2], r, r->left, r->top ) )
|
|
return( -1 );
|
|
}
|
|
else {
|
|
/* Mix of set and clear ... ask for both then and else parts
|
|
* and interleave.
|
|
*/
|
|
if( im_prepare( ir[1], r ) || im_prepare( ir[2], r ) )
|
|
return( -1 );
|
|
|
|
for( y = to; y < bo; y++ ) {
|
|
PEL *cp = (PEL *) IM_REGION_ADDR( ir[0], le, y );
|
|
PEL *ap = (PEL *) IM_REGION_ADDR( ir[1], le, y );
|
|
PEL *bp = (PEL *) IM_REGION_ADDR( ir[2], le, y );
|
|
PEL *q = (PEL *) IM_REGION_ADDR( or, le, y );
|
|
|
|
for( x = 0, i = 0; i < width; i++, x += size ) {
|
|
if( cp[i] )
|
|
for( z = x; z < x + size; z++ )
|
|
q[z] = ap[z];
|
|
else
|
|
for( z = x; z < x + size; z++ )
|
|
q[z] = bp[z];
|
|
}
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static int
|
|
ifthenelse( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
|
|
{
|
|
IMAGE **in;
|
|
|
|
/* Check args.
|
|
*/
|
|
if( im_check_uncoded( "im_ifthenelse", c ) ||
|
|
im_check_coding_known( "im_ifthenelse", a ) ||
|
|
im_check_coding_known( "im_ifthenelse", b ) ||
|
|
im_check_format( "ifthenelse", c, IM_BANDFMT_UCHAR ) ||
|
|
im_check_format_same( "ifthenelse", a, b ) ||
|
|
im_check_bands_same( "ifthenelse", a, b ) ||
|
|
im_check_bands_1orn( "im_ifthenelse", c, a ) ||
|
|
im_piocheck( c, out ) ||
|
|
im_pincheck( a ) ||
|
|
im_pincheck( b ) )
|
|
return( -1 );
|
|
|
|
/* Make output image.
|
|
*/
|
|
if( im_demand_hint( out, IM_THINSTRIP, c, a, b, NULL ) ||
|
|
im_cp_descv( out, a, b, c, NULL ) ||
|
|
!(in = im_allocate_input_array( out, c, a, b, NULL )) ||
|
|
im_generate( out,
|
|
im_start_many, ifthenelse_gen, im_stop_many,
|
|
in, NULL ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
/**
|
|
* im_ifthenelse:
|
|
* @c: condition #IMAGE
|
|
* @a: then #IMAGE
|
|
* @b: else #IMAGE
|
|
* @out: output #IMAGE
|
|
*
|
|
* This operation scans the condition image @c
|
|
* and uses it to select pixels from either the then image @a or the else
|
|
* image @b. Non-zero means @a, 0 means @b.
|
|
*
|
|
* Any image can have either 1 band or n bands, where n is the same for all
|
|
* the non-1-band images. Single band images are then effectively copied to
|
|
* make n-band images.
|
|
*
|
|
* Images @a and @b are cast up to the smallest common format.
|
|
*
|
|
* Images @a and @b must match exactly in size.
|
|
*
|
|
* See also: im_blend(), im_equal().
|
|
*
|
|
* Returns: 0 on success, -1 on error
|
|
*/
|
|
int
|
|
im_ifthenelse( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
|
|
{
|
|
IMAGE *t[7];
|
|
|
|
if( im_open_local_array( out, t, 7, "im_ifthenelse", "p" ) )
|
|
return( -1 );
|
|
|
|
/* Make a and b match in bands and format. Don't make c match: we
|
|
* special-case this in code above ^^^ for speed.
|
|
*/
|
|
if( im__formatalike( a, b, t[0], t[1] ) ||
|
|
im__bandalike( t[0], t[1], t[2], t[3] ) )
|
|
return( -1 );
|
|
|
|
/* If c is not uchar, do (!=0) to make a uchar image.
|
|
*/
|
|
if( c->BandFmt != IM_BANDFMT_UCHAR ) {
|
|
if( im_notequalconst( c, t[4], 0 ) )
|
|
return( -1 );
|
|
|
|
c = t[4];
|
|
}
|
|
|
|
if( ifthenelse( c, t[2], t[3], out ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|