216 lines
5.4 KiB
C
216 lines
5.4 KiB
C
/* base class for various operations on bands
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*
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* Copyright: 1991, N. Dessipris, modification of im_bandary()
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*
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* Author: N. Dessipris
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* Written on: 17/04/1991
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* Modified on :
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* 16/3/94 JC
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* - rewritten for partials
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* - now in ANSI C
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* - now works for any number of input images, except zero
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* 7/10/94 JC
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* - new IM_NEW()
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* 16/4/07
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* - fall back to im_copy() for 1 input image
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* 17/1/09
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* - cleanups
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* - gtk-doc
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* - im_bandary() just calls this
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* - works for RAD coding too
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* 27/1/10
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* - formatalike inputs
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* 17/5/11
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* - sizealike inputs
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* 27/10/11
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* - rewrite as a class
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* 20/11/11
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* - from bandjoin
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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., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 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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/*
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#define VIPS_DEBUG
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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 <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include <vips/debug.h>
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#include "bandary.h"
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G_DEFINE_ABSTRACT_TYPE( VipsBandary, vips_bandary, VIPS_TYPE_CONVERSION );
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/* Maximum number of input images -- why not?
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*/
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#define MAX_INPUT_IMAGES (64)
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static int
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vips_bandary_gen( VipsRegion *or, void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRegion **ir = (VipsRegion **) seq;
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VipsBandary *bandary = (VipsBandary *) b;
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VipsBandaryClass *class = VIPS_BANDARY_GET_CLASS( bandary );
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VipsRect *r = &or->valid;
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VipsPel *p[MAX_INPUT_IMAGES], *q;
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int y, i;
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for( i = 0; i < bandary->n; i++ ) {
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if( vips_region_prepare( ir[i], r ) )
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return( -1 );
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p[i] = VIPS_REGION_ADDR( ir[i], r->left, r->top );
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}
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p[i] = NULL;
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q = VIPS_REGION_ADDR( or, r->left, r->top );
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VIPS_GATE_START( "vips_bandary_gen: work" );
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for( y = 0; y < r->height; y++ ) {
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class->process_line( bandary, q, p, r->width );
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for( i = 0; i < bandary->n; i++ )
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p[i] += VIPS_REGION_LSKIP( ir[i] );
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q += VIPS_REGION_LSKIP( or );
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}
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VIPS_GATE_STOP( "vips_bandary_gen: work" );
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return( 0 );
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}
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static int
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vips_bandary_build( VipsObject *object )
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{
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VipsObjectClass *object_class = VIPS_OBJECT_GET_CLASS( object );
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VipsBandaryClass *class = VIPS_BANDARY_GET_CLASS( object );
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsBandary *bandary = VIPS_BANDARY( object );
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int i;
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VipsImage **decode;
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VipsImage **format;
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VipsImage **size;
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if( VIPS_OBJECT_CLASS( vips_bandary_parent_class )->build( object ) )
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return( -1 );
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if( bandary->n <= 0 ) {
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vips_error( object_class->nickname,
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"%s", _( "no input images" ) );
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return( -1 );
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}
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if( bandary->n > MAX_INPUT_IMAGES ) {
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vips_error( object_class->nickname,
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"%s", _( "too many input images" ) );
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return( -1 );
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}
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decode = (VipsImage **) vips_object_local_array( object, bandary->n );
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format = (VipsImage **) vips_object_local_array( object, bandary->n );
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size = (VipsImage **) vips_object_local_array( object, bandary->n );
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for( i = 0; i < bandary->n; i++ )
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if( vips_image_decode( bandary->in[i], &decode[i] ) )
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return( -1 );
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if( vips__formatalike_vec( decode, format, bandary->n ) ||
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vips__sizealike_vec( format, size, bandary->n ) )
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return( -1 );
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bandary->ready = size;
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if( vips_image_pipeline_array( conversion->out,
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VIPS_DEMAND_STYLE_THINSTRIP, bandary->ready ) )
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return( -1 );
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conversion->out->Bands = bandary->out_bands;
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if( class->format_table )
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conversion->out->BandFmt =
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class->format_table[bandary->ready[0]->BandFmt];
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if( vips_image_generate( conversion->out,
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vips_start_many, vips_bandary_gen, vips_stop_many,
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bandary->ready, bandary ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_bandary_class_init( VipsBandaryClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
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VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
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VIPS_DEBUG_MSG( "vips_bandary_class_init\n" );
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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vobject_class->nickname = "bandary";
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vobject_class->description = _( "operations on image bands" );
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vobject_class->build = vips_bandary_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL_UNBUFFERED;
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}
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static void
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vips_bandary_init( VipsBandary *bandary )
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{
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bandary->out_bands = -1;
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}
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/* Call this before chaining up in _build() to make the operation fall back to
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* copy.
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*/
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int
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vips_bandary_copy( VipsBandary *bandary )
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{
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VipsConversion *conversion = VIPS_CONVERSION( bandary );
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/* This isn't set by arith until build(), so we have to set
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* again here.
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*
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* Should arith set out in _init()?
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*/
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g_object_set( bandary, "out", vips_image_new(), NULL );
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return( vips_image_write( bandary->in[0], conversion->out ) );
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}
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