416 lines
10 KiB
C
416 lines
10 KiB
C
/* extract an area and/or a set of bands
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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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* 24/3/09
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* - added IM_CODING_RAD support
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* 29/1/10
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* - cleanups
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* - gtkdoc
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* 26/10/11
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* - redone as a class
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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 <vips/vips.h>
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#include <vips/internal.h>
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#include <vips/debug.h>
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#include "conversion.h"
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#include "bandary.h"
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typedef struct _VipsExtractArea {
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VipsConversion parent_instance;
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/* The input image.
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*/
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VipsImage *in;
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int left;
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int top;
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int width;
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int height;
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} VipsExtractArea;
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typedef VipsConversionClass VipsExtractAreaClass;
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G_DEFINE_TYPE( VipsExtractArea, vips_extract_area, VIPS_TYPE_CONVERSION );
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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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vips_extract_area_gen( VipsRegion *or, void *seq, void *a, void *b,
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gboolean *stop )
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{
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VipsRegion *ir = (VipsRegion *) seq;
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VipsExtractArea *extract = (VipsExtractArea *) b;
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VipsRect 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 += extract->left;
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iarea.top += extract->top;
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if( vips_region_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( vips_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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static int
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vips_extract_area_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsConversion *conversion = VIPS_CONVERSION( object );
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VipsExtractArea *extract = (VipsExtractArea *) object;
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if( VIPS_OBJECT_CLASS( vips_extract_area_parent_class )->
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build( object ) )
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return( -1 );
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if( extract->left + extract->width > extract->in->Xsize ||
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extract->top + extract->height > extract->in->Ysize ||
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extract->left < 0 || extract->top < 0 ||
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extract->width <= 0 || extract->height <= 0 ) {
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vips_error( class->nickname, "%s", _( "bad extract area" ) );
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return( -1 );
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}
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if( vips_image_pio_input( extract->in ) ||
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vips_check_coding_known( class->nickname, extract->in ) )
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return( -1 );
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if( vips_image_copy_fields( conversion->out, extract->in ) )
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return( -1 );
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vips_demand_hint( conversion->out,
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VIPS_DEMAND_STYLE_THINSTRIP, extract->in, NULL );
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conversion->out->Xsize = extract->width;
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conversion->out->Ysize = extract->height;
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conversion->out->Xoffset = -extract->left;
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conversion->out->Yoffset = -extract->top;
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if( vips_image_generate( conversion->out,
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vips_start_one, vips_extract_area_gen, vips_stop_one,
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extract->in, extract ) )
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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 divide by 0
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* etc. causing g_assert() failures later.
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*/
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#define RANGE (100000000)
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static void
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vips_extract_area_class_init( VipsExtractAreaClass *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_extract_area_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 = "extract_area";
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vobject_class->description = _( "extract an area from an image" );
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vobject_class->build = vips_extract_area_build;
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operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
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VIPS_ARG_IMAGE( class, "input", 0,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractArea, in ) );
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VIPS_ARG_INT( class, "left", 2,
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_( "Left" ),
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_( "Left edge of extract area" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractArea, left ),
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-RANGE, RANGE, 0 );
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VIPS_ARG_INT( class, "top", 3,
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_( "Top" ),
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_( "Top edge of extract area" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractArea, top ),
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-RANGE, RANGE, 0 );
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VIPS_ARG_INT( class, "width", 4,
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_( "Width" ),
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_( "Width of extract area" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractArea, width ),
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1, RANGE, 1 );
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VIPS_ARG_INT( class, "height", 5,
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_( "Height" ),
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_( "Height of extract area" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractArea, height ),
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1, RANGE, 1 );
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}
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static void
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vips_extract_area_init( VipsExtractArea *extract )
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{
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}
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/**
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* vips_extract_area:
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* @in: input image
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* @out: output image
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* @left: left edge of area to extract
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* @top: top edge of area to extract
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* @width: width of area to extract
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* @height: height of area to extract
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* @...: %NULL-terminated list of optional named arguments
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*
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* Extract an area from an image. The area must fit within @in.
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*
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* See also: vips_extract_bands().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_extract_area( VipsImage *in, VipsImage **out,
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int left, int top, int width, int height, ... )
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{
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va_list ap;
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int result;
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va_start( ap, height );
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result = vips_call_split( "extract_area", ap, in, out,
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left, top, width, height );
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va_end( ap );
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return( result );
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}
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typedef struct _VipsExtractBand {
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VipsBandary parent_instance;
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/* The input image.
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*/
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VipsImage *in;
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int band;
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int n;
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} VipsExtractBand;
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typedef VipsBandaryClass VipsExtractBandClass;
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G_DEFINE_TYPE( VipsExtractBand, vips_extract_band, VIPS_TYPE_BANDARY );
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static void
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vips_extract_band_buffer( VipsBandary *bandary,
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VipsPel *out, VipsPel **in, int width )
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{
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VipsConversion *conversion = (VipsConversion *) bandary;
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VipsExtractBand *extract = (VipsExtractBand *) bandary;
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VipsImage *im = bandary->ready[0];
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int es = VIPS_IMAGE_SIZEOF_ELEMENT( im );
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int ips = VIPS_IMAGE_SIZEOF_PEL( im );
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const int ops = VIPS_IMAGE_SIZEOF_PEL( conversion->out );
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VipsPel *p, *q;
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int x, z;
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p = in[0] + extract->band * es;
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q = out;
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for( x = 0; x < width; x++ ) {
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for( z = 0; z < ops; z++ )
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q[z] = p[z];
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p += ips;
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q += ops;
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}
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}
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static int
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vips_extract_band_build( VipsObject *object )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( object );
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VipsBandary *bandary = (VipsBandary *) object;
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VipsExtractBand *extract = (VipsExtractBand *) object;
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if( extract->in ) {
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bandary->n = 1;
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bandary->in = &extract->in;
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bandary->out_bands = extract->n;
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if( extract->band + extract->n > extract->in->Bands ) {
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vips_error( class->nickname,
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"%s", _( "bad extract band" ) );
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return( -1 );
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}
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if( extract->band == 0 &&
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extract->n == extract->in->Bands )
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return( vips_bandary_copy( bandary ) );
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}
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if( VIPS_OBJECT_CLASS( vips_extract_band_parent_class )->
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build( object ) )
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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_extract_band_class_init( VipsExtractBandClass *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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VipsBandaryClass *bandary_class = VIPS_BANDARY_CLASS( class );
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VIPS_DEBUG_MSG( "vips_extract_band_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 = "extract_band";
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vobject_class->description = _( "extract band from an image" );
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vobject_class->build = vips_extract_band_build;
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bandary_class->process_line = vips_extract_band_buffer;
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VIPS_ARG_IMAGE( class, "in", 0,
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_( "Input" ),
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_( "Input image" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractBand, in ) );
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VIPS_ARG_INT( class, "band", 3,
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_( "Band" ),
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_( "Band to extract" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsExtractBand, band ),
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0, RANGE, 0 );
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VIPS_ARG_INT( class, "n", 4,
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_( "n" ),
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_( "Number of bands to extract" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsExtractBand, n ),
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1, RANGE, 1 );
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}
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static void
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vips_extract_band_init( VipsExtractBand *extract )
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{
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extract->n = 1;
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}
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/**
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* vips_extract_band:
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* @in: input image
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* @out: output image
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* @band: band to extract
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* @...: %NULL-terminated list of optional named arguments
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*
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* Optional arguments:
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*
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* @n: number of bands to extract
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*
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* Extract a band or bands from an image. Extracting out of range is an error.
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*
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* See also: vips_extract_area().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_extract_band( VipsImage *in, VipsImage **out, int band, ... )
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{
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va_list ap;
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int result;
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va_start( ap, band );
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result = vips_call_split( "extract_band", ap, in, out, band );
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va_end( ap );
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return( result );
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}
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