libvips/libsrc/conversion/im_insert.c

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/* @(#) Insert one image into another. ins is inserted into image in at
* @(#) position x, y relative to the top LH corner of in. out is made large
* @(#) enough to hold both in and ins. Any areas of out not coming from
* @(#) either in or ins are set to black (binary 0). If ins overlaps in, ins
* @(#) will appear on top of in. Both images must have the same number of
* @(#) bands and the same BandFmt.
* @(#)
* @(#) im_insert_noepand() always outputs an image the same size as in.
* @(#)
* @(#) Usage:
* @(#)
* @(#) int im_insert(in, ins, out, x, y )
* @(#) IMAGE *in, *ins, *out;
* @(#) int x, y;
* @(#)
* @(#) int im_insert_noexpand(in, ins, out, x, y )
* @(#) IMAGE *in, *ins, *out;
* @(#) int x, y;
* @(#)
* @(#) Returns 0 on success and -1 on error.
*
* Copyright: 1990, J. Cupitt
*
* Author: J. Cupitt
* Written on: 02/08/1990
* Modified on :
* 31/8/93 JC
* - ANSIfied
* - Nicos' reformatting undone. Grr!
* 22/12/94
* - modernised
* - now does IM_CODING_LABQ too
* 22/6/95 JC
* - partialized
* 10/2/02 JC
* - adapted for im_prepare_to() stuff
* 14/4/04
* - sets Xoffset / Yoffset
* 3/7/06
* - add sanity range checks
*/
/*
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 <vips/vips.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
/* Hold our state in this.
*/
typedef struct {
/* Args.
*/
IMAGE *main; /* Main image */
IMAGE *sub; /* Sub image */
IMAGE *out; /* Output image */
int x, y; /* Position of sub wrt. main */
/* Geometry.
*/
Rect rout; /* Output space */
Rect rmain; /* Position of main in output */
Rect rsub; /* Position of sub in output */
} InsertState;
/* Trivial case: we just need pels from one of the inputs.
*/
static int
just_one( REGION *or, REGION *ir, int x, int y )
{
Rect need;
/* Find the part of pos we need.
*/
need = or->valid;
need.left -= x;
need.top -= y;
if( im_prepare( ir, &need ) )
return( -1 );
/* Attach our output to it.
*/
if( im_region_region( or, ir, &or->valid, need.left, need.top ) )
return( -1 );
return( 0 );
}
/* Black out a region.
*/
static void
black_region( REGION *reg )
{
PEL *q = (PEL *) IM_REGION_ADDR( reg, reg->valid.left, reg->valid.top );
int wd = IM_REGION_SIZEOF_LINE( reg );
int ls = IM_REGION_LSKIP( reg );
int y;
for( y = 0; y < reg->valid.height; y++, q += ls )
memset( (char *) q, 0, wd );
}
/* Paste in parts of ir that fall within or --- ir is an input REGION for an
* image positioned at pos within or.
*/
static int
paste_region( REGION *or, REGION *ir, Rect *pos )
{
Rect ovl;
/* Does any of the sub-image appear in the area we have been asked
* to make?
*/
im_rect_intersectrect( &or->valid, pos, &ovl );
if( !im_rect_isempty( &ovl ) ) {
/* Find the part of in we need.
*/
ovl.left -= pos->left;
ovl.top -= pos->top;
/* Paint this area of pixels into or.
*/
if( im_prepare_to( ir, or, &ovl,
ovl.left + pos->left, ovl.top + pos->top ) )
return( -1 );
}
return( 0 );
}
/* Insert generate function.
*/
static int
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insert_gen( REGION *or, void *seq, void *a, void *b )
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{
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REGION **ir = (REGION **) seq;
InsertState *ins = (InsertState *) b;
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Rect ovl;
/* Does the rect we have been asked for fall entirely inside the
* sub-image?
*/
if( im_rect_includesrect( &ins->rsub, &or->valid ) )
return( just_one( or, ir[1],
ins->rsub.left, ins->rsub.top ) );
/* Does it fall entirely inside the main, and not at all inside the
* sub?
*/
im_rect_intersectrect( &or->valid, &ins->rsub, &ovl );
if( im_rect_includesrect( &ins->rmain, &or->valid ) &&
im_rect_isempty( &ovl ) )
return( just_one( or, ir[0],
ins->rmain.left, ins->rmain.top ) );
/* Output requires both (or neither) input. If it is not entirely
* inside both the main and the sub, then there is going to be some
* black.
*/
if( !(im_rect_includesrect( &ins->rsub, &or->valid ) &&
im_rect_includesrect( &ins->rmain, &or->valid )) )
/* Could be clever --- but just black the whole thing for
* simplicity.
*/
black_region( or );
/* Paste from main.
*/
if( paste_region( or, ir[0], &ins->rmain ) )
return( -1 );
/* Paste from sub.
*/
if( paste_region( or, ir[1], &ins->rsub ) )
return( -1 );
return( 0 );
}
/* xy range we sanity check on ... just to stop crazy numbers from 1/0 etc.
* causing assert() failuresd later.
*/
#define RANGE (10000000)
/* Do an insert.
*/
int
im_insert( IMAGE *main, IMAGE *sub, IMAGE *out, int x, int y )
{
InsertState *ins = IM_NEW( out, InsertState );
IMAGE **vec;
/* Check args.
*/
if( !ins || im_piocheck( main, out ) || im_pincheck( sub ) )
return( -1 );
if( main->BandFmt != sub->BandFmt || main->Bands != sub->Bands ||
main->Coding != sub->Coding ) {
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im_error( "im_insert", "%s", _( "inputs differ in format" ) );
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return( -1 );
}
if( main->Coding != IM_CODING_NONE && main->Coding != IM_CODING_LABQ ) {
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im_error( "im_insert", "%s",
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_( "input should be uncoded or IM_CODING_LABQ" ) );
return( -1 );
}
if( x > RANGE || x < -RANGE || y > RANGE || y < -RANGE ) {
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im_error( "im_insert", "%s", _( "xy out of range" ) );
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return( -1 );
}
/* Save args.
*/
ins->main = main;
ins->sub = sub;
ins->out = out;
ins->x = x;
ins->y = y;
/* Calculate geometry. First, position rmain and rsub with (0,0) at
* top LH corner of main.
*/
ins->rmain.left = 0;
ins->rmain.top = 0;
ins->rmain.width = main->Xsize;
ins->rmain.height = main->Ysize;
ins->rsub.left = x;
ins->rsub.top = y;
ins->rsub.width = sub->Xsize;
ins->rsub.height = sub->Ysize;
/* Now: output is bounding box of these two.
*/
im_rect_unionrect( &ins->rmain, &ins->rsub, &ins->rout );
/* Translate origin to top LH corner of rout.
*/
ins->rmain.left -= ins->rout.left;
ins->rmain.top -= ins->rout.top;
ins->rsub.left -= ins->rout.left;
ins->rsub.top -= ins->rout.top;
ins->rout.left = 0;
ins->rout.top = 0;
/* Set up the output header.
*/
if( im_cp_descv( out, main, sub, NULL ) )
return( -1 );
out->Xsize = ins->rout.width;
out->Ysize = ins->rout.height;
/* Set demand hints.
*/
if( im_demand_hint( out, IM_THINSTRIP, main, sub, NULL ) )
return( -1 );
/* Make input array.
*/
if( !(vec = im_allocate_input_array( out, main, sub, NULL )) )
return( -1 );
/* Make output image.
*/
if( im_generate( out,
im_start_many, insert_gen, im_stop_many, vec, ins ) )
return( -1 );
out->Xoffset = ins->rmain.left;
out->Yoffset = ins->rmain.top;
return( 0 );
}
/* As above, but don't expand to hold all of sub.
*/
int
im_insert_noexpand( IMAGE *main, IMAGE *sub, IMAGE *out, int x, int y )
{
InsertState *ins = IM_NEW( out, InsertState );
IMAGE **vec;
/* Check args.
*/
if( !ins || im_piocheck( main, out ) || im_pincheck( sub ) )
return( -1 );
if( main->BandFmt != sub->BandFmt || main->Bands != sub->Bands ||
main->Coding != sub->Coding ) {
im_error( "im_insert_noexpand",
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"%s", _( "inputs differ in format" ) );
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return( -1 );
}
if( main->Coding != IM_CODING_NONE && main->Coding != IM_CODING_LABQ ) {
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im_error( "im_insert_noexpand", "%s",
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_( "input should be uncoded or IM_CODING_LABQ" ) );
return( -1 );
}
if( x > RANGE || x < -RANGE || y > RANGE || y < -RANGE ) {
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im_error( "im_insert", "%s", _( "xy out of range" ) );
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return( -1 );
}
/* Save args.
*/
ins->main = main;
ins->sub = sub;
ins->out = out;
ins->x = x;
ins->y = y;
/* Calculate geometry.
*/
ins->rmain.left = 0;
ins->rmain.top = 0;
ins->rmain.width = main->Xsize;
ins->rmain.height = main->Ysize;
ins->rsub.left = x;
ins->rsub.top = y;
ins->rsub.width = sub->Xsize;
ins->rsub.height = sub->Ysize;
ins->rout = ins->rmain;
/* Set up the output header.
*/
if( im_cp_descv( out, main, sub, NULL ) )
return( -1 );
out->Xsize = ins->rout.width;
out->Ysize = ins->rout.height;
/* Set demand hints.
*/
if( im_demand_hint( out, IM_THINSTRIP, main, sub, NULL ) )
return( -1 );
/* Make input array.
*/
if( !(vec = im_allocate_input_array( out, main, sub, NULL )) )
return( -1 );
/* Make output image.
*/
if( im_generate( out,
im_start_many, insert_gen, im_stop_many, vec, ins ) )
return( -1 );
return( 0 );
}