267 lines
6.5 KiB
C
267 lines
6.5 KiB
C
/* @(#) Function to extract a portion of a Vasari format picture.
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* @(#) Function im_extract() assumes that the imin image
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* @(#) is either memory mapped or in the buffer pimin->data.
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* @(#)
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* @(#) int im_extract(pimin, pimout, pbox)
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* @(#) IMAGE *pimin, *pimout;
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* @(#) IMAGE_BOX *pbox;
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* @(#)
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* @(#) All functions return 0 on success and -1 on error
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* @(#)
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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: 12/02/1990
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* Modified on: 4/6/92, J.Cupitt
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* - speed up! why wasn't this done before? Why am I stupid?
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* - layout, messages fixed
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* now extracts IM_CODING_LABQ to IM_CODING_LABQ file: K.Martinez 1/7/93
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* 2/7/93 JC
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* - adapted for partial v2
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* - ANSIfied
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* 7/7/93 JC
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* - behaviour for IM_CODING_LABQ fixed
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* - better messages
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* 7/10/94 JC
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* - new IM_NEW()
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* 22/2/95 JC
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* - new use of im_region_region()
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* 6/7/98 JC
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* - im_extract_area() and im_extract_band() added
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* 11/7/01 JC
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* - im_extract_band() now numbers from zero
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* 7/11/01 JC
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* - oh what pain, im_extract now numbers bands from zero as well
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* 6/9/02 JC
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* - zero xoff/yoff for extracted area
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* 14/4/04 JC
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* - nope, -ve the origin
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* 17/7/04
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* - added im_extract_bands(), remove many bands from image
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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 <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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/* Extract one or more bands ... get number of output bands from
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* or->im->Bands.
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*/
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static int
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extract_band( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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IMAGE_BOX *box = (IMAGE_BOX *) b;
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Rect *r = &or->valid;
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int le = r->left;
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int ri = IM_RECT_RIGHT(r);
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int to = r->top;
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int bo = IM_RECT_BOTTOM(r);
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int es = IM_IMAGE_SIZEOF_ELEMENT( ir->im );
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int ipel = IM_IMAGE_SIZEOF_PEL( ir->im );
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int opel = IM_IMAGE_SIZEOF_PEL( or->im );
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Rect iarea;
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char *p, *q;
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int x, y, z;
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/* Ask for input we need.
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*/
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iarea = or->valid;
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iarea.left += box->xstart;
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iarea.top += box->ystart;
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if( im_prepare( ir, &iarea ) )
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return( -1 );
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for( y = to; y < bo; y++ ) {
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p = IM_REGION_ADDR( ir, le + box->xstart, y + box->ystart ) +
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box->chsel * es;
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q = IM_REGION_ADDR( or, le, y );
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for( x = le; x < ri; x++ ) {
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for( z = 0; z < opel; z++ )
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q[z] = p[z];
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p += ipel;
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q += opel;
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}
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}
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return( 0 );
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}
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/* Extract an area. Can just use pointers.
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*/
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static int
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extract_area( REGION *or, void *seq, void *a, void *b )
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{
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REGION *ir = (REGION *) seq;
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IMAGE_BOX *box = (IMAGE_BOX *) b;
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Rect iarea;
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/* Ask for input we need. Translate from demand in or's space to
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* demand in ir's space.
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*/
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iarea = or->valid;
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iarea.left += box->xstart;
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iarea.top += box->ystart;
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if( im_prepare( ir, &iarea ) )
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return( -1 );
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/* Attach or to ir.
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*/
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if( im_region_region( or, ir, &or->valid, iarea.left, iarea.top ) )
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return( -1 );
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return( 0 );
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}
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/* Extract an area and bands from an image.
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*/
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int
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im_extract_areabands( IMAGE *in, IMAGE *out,
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int left, int top, int width, int height, int band, int nbands )
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{
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IMAGE_BOX *box;
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if( im_piocheck( in, out ) )
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return( -1 );
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if( band < 0 || nbands < 1 || band + nbands > in->Bands ) {
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im_error( "im_extract_areabands",
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"%s", _( "band selection out of range" ) );
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return( -1 );
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}
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if( left + width > in->Xsize ||
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top + height > in->Ysize ||
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left < 0 || top < 0 ||
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width <= 0 || height <= 0 ) {
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im_error( "im_extract_areabands",
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"%s", _( "bad extract area" ) );
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return( -1 );
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}
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if( in->Coding != IM_CODING_NONE ) {
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if( in->Coding != IM_CODING_LABQ ) {
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im_error( "im_extract_areabands",
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"%s", _( "unknown coding" ) );
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return( -1 );
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}
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/* We only do area extract for coding == labq.
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*/
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if( band != 0 || nbands != in->Bands ) {
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im_error( "im_extract_areabands",
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"%s", _( "can only extract areas from LABQ" ) );
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return( -1 );
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}
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}
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/* Set up the output header.
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*/
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if( im_cp_desc( out, in ) )
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return( -1 );
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out->Bands = nbands;
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out->Xsize = width;
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out->Ysize = height;
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if( im_demand_hint( out, IM_THINSTRIP, in, NULL ) )
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return( -1 );
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if( !(box = IM_NEW( out, IMAGE_BOX )) )
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return( -1 );
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box->xstart = left;
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box->ystart = top;
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box->xsize = width;
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box->ysize = height;
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box->chsel = band;
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/* Extracting all bands is a special case ... we can do it with
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* pointers.
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*/
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if( band == 0 && nbands == in->Bands ) {
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if( im_generate( out,
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im_start_one, extract_area, im_stop_one, in, box ) )
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return( -1 );
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}
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else {
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if( im_generate( out,
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im_start_one, extract_band, im_stop_one, in, box ) )
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return( -1 );
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}
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out->Xoffset = -left;
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out->Yoffset = -top;
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return( 0 );
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}
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/* Legacy interface.
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*/
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int
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im_extract( IMAGE *in, IMAGE *out, IMAGE_BOX *box )
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{
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if( box->chsel == -1 )
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return( im_extract_areabands( in, out,
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box->xstart, box->ystart, box->xsize, box->ysize,
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0, in->Bands ) );
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else
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return( im_extract_areabands( in, out,
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box->xstart, box->ystart, box->xsize, box->ysize,
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box->chsel, 1 ) );
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}
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/* Convenience functions.
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*/
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int
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im_extract_area( IMAGE *in, IMAGE *out,
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int left, int top, int width, int height )
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{
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return( im_extract_areabands( in, out,
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left, top, width, height, 0, in->Bands ) );
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}
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int
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im_extract_bands( IMAGE *in, IMAGE *out, int chsel, int nbands )
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{
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return( im_extract_areabands( in, out,
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0, 0, in->Xsize, in->Ysize, chsel, nbands ) );
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}
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int
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im_extract_band( IMAGE *in, IMAGE *out, int chsel )
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{
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return( im_extract_bands( in, out, chsel, 1 ) );
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}
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