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