367 lines
8.6 KiB
C
367 lines
8.6 KiB
C
/* @(#) Two images as input: must match in size and type. Build an output
|
|
* @(#) image blending pixels together according to a conditional image.
|
|
* @(#)
|
|
* @(#) The conditional image can have n bands or 1 band. If n bands, then we
|
|
* @(#) choose from the two source images an element at a time. If 1 band,
|
|
* @(#) then choose from the source images a pixel at a time.
|
|
* @(#)
|
|
* @(#) int
|
|
* @(#) im_blend( c, a, b, out )
|
|
* @(#) IMAGE *c, *a, *b;
|
|
* @(#) IMAGE *out;
|
|
* @(#)
|
|
* @(#) Returns either 0 (success) or -1 (fail).
|
|
*
|
|
* Modified:
|
|
* 15/4/05
|
|
* - from im_ifthenelse()
|
|
* 8/7/05
|
|
* - oops, broken for some combinations of band differences (thanks Joe)
|
|
*/
|
|
|
|
/*
|
|
|
|
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 <assert.h>
|
|
|
|
#include <vips/vips.h>
|
|
|
|
#ifdef WITH_DMALLOC
|
|
#include <dmalloc.h>
|
|
#endif /*WITH_DMALLOC*/
|
|
|
|
#define iblend1( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( i = 0, x = 0; x < n; i++, x += bands ) { \
|
|
const int v = c[i]; \
|
|
\
|
|
for( z = x; z < x + bands; z++ ) \
|
|
q[z] = (v * a[z] + (255 - v) * b[z] + 128) / 255; \
|
|
} \
|
|
}
|
|
|
|
#define iblendn( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( x = 0; x < n; x += bands ) { \
|
|
for( z = x; z < x + bands; z++ ) { \
|
|
const int v = c[z]; \
|
|
\
|
|
q[z] = (v * a[z] + (255 - v) * b[z] + 128) / 255; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
#define fblend1( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( i = 0, x = 0; x < n; i++, x += bands ) { \
|
|
const double v = c[i] / 255.0; \
|
|
\
|
|
for( z = x; z < x + bands; z++ ) \
|
|
q[z] = v * a[z] + (1.0 - v) * b[z]; \
|
|
} \
|
|
}
|
|
|
|
#define fblendn( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( x = 0; x < n; x += bands ) { \
|
|
for( z = x; z < x + bands; z++ ) { \
|
|
const double v = c[z] / 255.0; \
|
|
\
|
|
q[z] = v * a[z] + (1.0 - v) * b[z]; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
#define cblend1( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( i = 0, x = 0; x < n; i++, x += bands ) { \
|
|
const double v = c[i] / 255.0; \
|
|
\
|
|
for( z = x; z < x + 2 * bands; z++ ) \
|
|
q[z] = v * a[z] + (1.0 - v) * b[z]; \
|
|
} \
|
|
}
|
|
|
|
#define cblendn( TYPE ) { \
|
|
TYPE *a = (TYPE *) ap; \
|
|
TYPE *b = (TYPE *) bp; \
|
|
TYPE *q = (TYPE *) qp; \
|
|
\
|
|
for( x = 0; x < n; x += bands ) { \
|
|
for( z = x; z < x + bands; z++ ) { \
|
|
const double v = c[z] / 255.0; \
|
|
\
|
|
q[2 * z] = v * a[2 * z] + (1.0 - v) * b[2 * z]; \
|
|
q[2 * z + 1] = v * a[2 * z + 1] + \
|
|
(1.0 - v) * b[2 * z + 1]; \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
/* Blend with a 1-band conditional image.
|
|
*/
|
|
static void
|
|
blend1_buffer( PEL *qp, PEL *c, PEL *ap, PEL *bp, int width, IMAGE *im )
|
|
{
|
|
int i, x, z;
|
|
const int bands = im->Bands;
|
|
const int n = width * bands;
|
|
|
|
switch( im->BandFmt ) {
|
|
case IM_BANDFMT_UCHAR:
|
|
iblend1( unsigned char ); break;
|
|
case IM_BANDFMT_CHAR:
|
|
iblend1( signed char ); break;
|
|
case IM_BANDFMT_USHORT:
|
|
iblend1( unsigned short ); break;
|
|
case IM_BANDFMT_SHORT:
|
|
iblend1( signed short ); break;
|
|
case IM_BANDFMT_UINT:
|
|
iblend1( unsigned int ); break;
|
|
case IM_BANDFMT_INT:
|
|
iblend1( signed int ); break;
|
|
case IM_BANDFMT_FLOAT:
|
|
fblend1( float ); break;
|
|
case IM_BANDFMT_DOUBLE:
|
|
fblend1( double ); break;
|
|
case IM_BANDFMT_COMPLEX:
|
|
cblend1( float ); break;
|
|
case IM_BANDFMT_DPCOMPLEX:
|
|
cblend1( double ); break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
/* Blend with a many band conditional image.
|
|
*/
|
|
static void
|
|
blendn_buffer( PEL *qp, PEL *c, PEL *ap, PEL *bp, int width, IMAGE *im )
|
|
{
|
|
int x, z;
|
|
const int bands = im->Bands;
|
|
const int n = width * bands;
|
|
|
|
switch( im->BandFmt ) {
|
|
case IM_BANDFMT_UCHAR:
|
|
iblendn( unsigned char ); break;
|
|
case IM_BANDFMT_CHAR:
|
|
iblendn( signed char ); break;
|
|
case IM_BANDFMT_USHORT:
|
|
iblendn( unsigned short ); break;
|
|
case IM_BANDFMT_SHORT:
|
|
iblendn( signed short ); break;
|
|
case IM_BANDFMT_UINT:
|
|
iblendn( unsigned int ); break;
|
|
case IM_BANDFMT_INT:
|
|
iblendn( signed int ); break;
|
|
case IM_BANDFMT_FLOAT:
|
|
fblendn( float ); break;
|
|
case IM_BANDFMT_DOUBLE:
|
|
fblendn( double ); break;
|
|
case IM_BANDFMT_COMPLEX:
|
|
cblendn( float ); break;
|
|
case IM_BANDFMT_DPCOMPLEX:
|
|
cblendn( double ); break;
|
|
|
|
default:
|
|
assert( 0 );
|
|
}
|
|
}
|
|
|
|
static int
|
|
blend_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 c_elements = r->width * c->Bands;
|
|
int x, y;
|
|
|
|
int all0, all255;
|
|
|
|
/* Ask for condition pixels.
|
|
*/
|
|
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;
|
|
all255 = *((PEL *) IM_REGION_ADDR( ir[0], le, to )) == 255;
|
|
for( y = to; y < bo; y++ ) {
|
|
PEL *p = (PEL *) IM_REGION_ADDR( ir[0], le, y );
|
|
|
|
for( x = 0; x < c_elements; x++ ) {
|
|
all0 &= p[x] == 0;
|
|
all255 &= p[x] == 255;
|
|
}
|
|
|
|
if( !all0 && !all255 )
|
|
break;
|
|
}
|
|
|
|
if( all255 ) {
|
|
/* All 255. 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 );
|
|
|
|
if( c->Bands == 1 )
|
|
blend1_buffer( q, cp, ap, bp, r->width, a );
|
|
else
|
|
blendn_buffer( q, cp, ap, bp, r->width, a );
|
|
}
|
|
}
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
int
|
|
im_blend( IMAGE *c, IMAGE *a, IMAGE *b, IMAGE *out )
|
|
{
|
|
IMAGE **in;
|
|
|
|
/* If a and b are both LABPACK, repack agan after the blend.
|
|
*/
|
|
if( a->Coding == IM_CODING_LABQ || b->Coding == IM_CODING_LABQ ) {
|
|
IMAGE *t[3];
|
|
int repack = a->Coding == IM_CODING_LABQ &&
|
|
b->Coding == IM_CODING_LABQ;
|
|
|
|
if( im_open_local_array( out, t, 3, "relational-1", "p" ) )
|
|
return( -1 );
|
|
|
|
if( a->Coding == IM_CODING_LABQ ) {
|
|
if( im_LabQ2Lab( a, t[0] ) )
|
|
return( -1 );
|
|
a = t[0];
|
|
}
|
|
|
|
if( b->Coding == IM_CODING_LABQ ) {
|
|
if( im_LabQ2Lab( b, t[1] ) )
|
|
return( -1 );
|
|
b = t[1];
|
|
}
|
|
|
|
if( repack )
|
|
return( im_blend( c, a, b, t[2] ) ||
|
|
im_Lab2LabQ( t[2], out ) );
|
|
else
|
|
return( im_blend( c, a, b, out ) );
|
|
}
|
|
|
|
/* Check args.
|
|
*/
|
|
if( a->Coding != IM_CODING_NONE || b->Coding != IM_CODING_NONE ||
|
|
c->Coding != IM_CODING_NONE ) {
|
|
im_error( "im_blend", "%s", _( "images not uncoded" ) );
|
|
return( -1 );
|
|
}
|
|
if( a->BandFmt != b->BandFmt ||
|
|
a->Bands != b->Bands ) {
|
|
im_error( "im_blend",
|
|
"%s", _( "size and format of then and else "
|
|
"must match" ) );
|
|
return( -1 );
|
|
}
|
|
if( c->BandFmt != IM_BANDFMT_UCHAR ) {
|
|
im_error( "im_blend",
|
|
"%s", _( "conditional image must be uchar" ) );
|
|
return( -1 );
|
|
}
|
|
if( c->Bands != 1 && c->Bands != a->Bands ) {
|
|
im_error( "im_blend",
|
|
"%s", _( "conditional image must be one band or "
|
|
"same as then and else images" ) );
|
|
return( -1 );
|
|
}
|
|
if( im_piocheck( c, out ) || im_pincheck( a ) || im_pincheck( b ) )
|
|
return( -1 );
|
|
if( im_demand_hint( out, IM_THINSTRIP, a, b, c, NULL ) )
|
|
return( -1 );
|
|
|
|
/* Make output image.
|
|
*/
|
|
if( im_cp_descv( out, a, b, c, NULL ) ||
|
|
!(in = im_allocate_input_array( out, c, a, b, NULL )) ||
|
|
im_generate( out,
|
|
im_start_many, blend_gen, im_stop_many,
|
|
in, NULL ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|