267 lines
6.5 KiB
C
267 lines
6.5 KiB
C
/* im_header_int, im_header_double, im_header_string: output various fields
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* from the VIPS header
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*
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* 9/7/02 JC
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* - first version
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* 7/6/05
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* - now reads meta fields too
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* - cleaned up
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* - added im_header_exists(), im_header_map()
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* 1/8/05
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* - now im_header_get_type() and im_header_get() rather than
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* im_header_exists()
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* 4/1/07
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* - removed Hist from standard fields ... now a separate function
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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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#include <vips/internal.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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/* Name, offset pair.
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*/
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typedef struct _HeaderField {
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const char *field;
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glong offset;
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} HeaderField;
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/* Built in fields and struct offsets.
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*/
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static HeaderField int_field[] = {
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{ "Xsize", G_STRUCT_OFFSET( IMAGE, Xsize ) },
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{ "Ysize", G_STRUCT_OFFSET( IMAGE, Ysize ) },
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{ "Bands", G_STRUCT_OFFSET( IMAGE, Bands ) },
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{ "Bbits", G_STRUCT_OFFSET( IMAGE, Bbits ) },
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{ "BandFmt", G_STRUCT_OFFSET( IMAGE, BandFmt ) },
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{ "Coding", G_STRUCT_OFFSET( IMAGE, Coding ) },
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{ "Type", G_STRUCT_OFFSET( IMAGE, Type ) },
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{ "Xoffset", G_STRUCT_OFFSET( IMAGE, Xoffset ) },
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{ "Yoffset", G_STRUCT_OFFSET( IMAGE, Yoffset ) }
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};
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/* These are actually floats :-( how annoying. We report them as doubles for
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* consistency with the im_meta_*() functions.
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*/
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static HeaderField double_field[] = {
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{ "Xres", G_STRUCT_OFFSET( IMAGE, Xres ) },
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{ "Yres", G_STRUCT_OFFSET( IMAGE, Yres ) }
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};
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static HeaderField string_field[] = {
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{ "filename", G_STRUCT_OFFSET( IMAGE, filename ) }
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};
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int
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im_header_int( IMAGE *im, const char *field, int *out )
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{
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int i;
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for( i = 0; i < IM_NUMBER( int_field ); i++ )
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if( strcmp( field, int_field[i].field ) == 0 ) {
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*out = G_STRUCT_MEMBER( int, im,
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int_field[i].offset );
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break;
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}
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if( i == IM_NUMBER( int_field ) &&
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im_meta_get_int( im, field, out ) ) {
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im_error( "im_header_int",
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_( "no such int field \"%s\"" ), field );
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return( -1 );
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}
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return( 0 );
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}
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int
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im_header_double( IMAGE *im, const char *field, double *out )
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{
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int i;
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for( i = 0; i < IM_NUMBER( double_field ); i++ )
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if( strcmp( field, double_field[i].field ) == 0 ) {
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*out = G_STRUCT_MEMBER( float, im,
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double_field[i].offset );
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break;
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}
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if( i == IM_NUMBER( double_field ) &&
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im_meta_get_double( im, field, out ) ) {
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im_error( "im_header_double",
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_( "no such double field \"%s\"" ), field );
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return( -1 );
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}
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return( 0 );
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}
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int
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im_header_string( IMAGE *im, const char *field, char **out )
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{
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int i;
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for( i = 0; i < IM_NUMBER( string_field ); i++ )
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if( strcmp( field, string_field[i].field ) == 0 ) {
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*out = G_STRUCT_MEMBER( char *, im,
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string_field[i].offset );
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break;
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}
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if( i == IM_NUMBER( string_field ) &&
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im_meta_get_string( im, field, out ) ) {
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im_error( "im_header_string",
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_( "no such string field \"%s\"" ), field );
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return( -1 );
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}
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return( 0 );
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}
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GType
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im_header_get_type( IMAGE *im, const char *field )
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{
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int i;
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GType type;
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for( i = 0; i < IM_NUMBER( int_field ); i++ )
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if( strcmp( field, int_field[i].field ) == 0 )
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return( G_TYPE_INT );
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for( i = 0; i < IM_NUMBER( double_field ); i++ )
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if( strcmp( field, double_field[i].field ) == 0 )
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return( G_TYPE_DOUBLE );
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for( i = 0; i < IM_NUMBER( string_field ); i++ )
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if( strcmp( field, string_field[i].field ) == 0 )
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return( G_TYPE_STRING );
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if( (type = im_meta_get_type( im, field )) )
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return( type );
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return( 0 );
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}
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/* Fill value_copy with a copy of the value, -1 on error. value_copy must be
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* zeroed but uninitialised. User must g_value_unset( value ).
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*/
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int
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im_header_get( IMAGE *im, const char *field, GValue *value_copy )
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{
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int i;
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for( i = 0; i < IM_NUMBER( int_field ); i++ )
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if( strcmp( field, int_field[i].field ) == 0 ) {
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g_value_init( value_copy, G_TYPE_INT );
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g_value_set_int( value_copy,
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G_STRUCT_MEMBER( int, im,
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int_field[i].offset ) );
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return( 0 );
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}
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for( i = 0; i < IM_NUMBER( double_field ); i++ )
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if( strcmp( field, double_field[i].field ) == 0 ) {
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g_value_init( value_copy, G_TYPE_DOUBLE );
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g_value_set_double( value_copy,
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G_STRUCT_MEMBER( float, im,
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double_field[i].offset ) );
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return( 0 );
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}
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for( i = 0; i < IM_NUMBER( string_field ); i++ )
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if( strcmp( field, string_field[i].field ) == 0 ) {
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g_value_init( value_copy, G_TYPE_STRING );
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g_value_set_static_string( value_copy,
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G_STRUCT_MEMBER( char *, im,
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string_field[i].offset ) );
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return( 0 );
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}
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if( !im_meta_get( im, field, value_copy ) )
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return( 0 );
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return( -1 );
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}
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static void *
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header_map_fn( Meta *meta, im_header_map_fn fn, void *a )
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{
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return( fn( meta->im, meta->field, &meta->value, a ) );
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}
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void *
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im_header_map( IMAGE *im, im_header_map_fn fn, void *a )
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{
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int i;
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GValue value = { 0 };
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void *result;
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for( i = 0; i < IM_NUMBER( int_field ); i++ ) {
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im_header_get( im, int_field[i].field, &value );
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result = fn( im, int_field[i].field, &value, a );
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g_value_unset( &value );
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if( result )
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return( result );
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}
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for( i = 0; i < IM_NUMBER( double_field ); i++ ) {
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im_header_get( im, double_field[i].field, &value );
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result = fn( im, double_field[i].field, &value, a );
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g_value_unset( &value );
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if( result )
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return( result );
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}
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for( i = 0; i < IM_NUMBER( string_field ); i++ ) {
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im_header_get( im, string_field[i].field, &value );
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result = fn( im, string_field[i].field, &value, a );
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g_value_unset( &value );
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if( result )
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return( result );
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}
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if( im->Meta_traverse &&
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(result = im_slist_map2( im->Meta_traverse,
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(VSListMap2Fn) header_map_fn, fn, a )) )
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return( result );
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return( NULL );
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}
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