747 lines
17 KiB
C
747 lines
17 KiB
C
/* load ppm from a file
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*
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* Stephen Chan ... original code
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*
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* 21/11/00 JC
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* - hacked for VIPS
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* - reads ppm/pgm/pbm
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* - mmaps binary pgm/ppm
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* - reads all ascii formats (slowly!)
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* 22/11/00 JC
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* - oops, ascii read was broken
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* - does 16/32 bit ascii now as well
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* 24/5/01
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* - im_ppm2vips_header() added
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* 28/11/03 JC
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* - better no-overshoot on tile loop
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* 22/5/04
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* - does 16/32 bit binary too
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* - tiny fix for missing file close on read error
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* 19/8/05
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* - use im_raw2vips() for binary read
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* 9/9/05
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* - tiny cleanups
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* 3/11/07
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* - use im_wbuffer() for bg writes
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* 1/5/10
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* - add PFM (portable float map) support
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* 19/12/11
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* - rework as a set of fns ready to be called from a class
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* 8/11/14
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* - add 1 bit write
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* 29/7/19 Kyle-Kyle
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* - fix a loop with malformed ppm
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* 13/11/19
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* - redone with streams
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* - sequential load, plus mmap for filename streams
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* - faster plus lower memory use
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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 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 <ctype.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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#include "pforeign.h"
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#ifdef HAVE_PPM
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typedef struct _VipsForeignLoadPpm {
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VipsForeignLoad parent_object;
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/* The stream we load from, and the buffered wrapper for it.
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*/
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VipsStreami *streami;
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VipsBufis *bufis;
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/* Properties of this ppm, from the header.
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*/
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int width;
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int height;
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int bands;
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VipsBandFormat format;
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VipsInterpretation interpretation;
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float scale;
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int max_value;
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int index; /* ppm type .. index in magic_names[] */
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int bits; /* 1, 8, 16 or 32 */
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gboolean ascii; /* TRUE for ascii encoding */
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gboolean msb_first; /* TRUE if most sig byte is first */
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gboolean have_read_header;
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} VipsForeignLoadPpm;
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typedef VipsForeignLoadClass VipsForeignLoadPpmClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadPpm, vips_foreign_load_ppm,
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VIPS_TYPE_FOREIGN_LOAD );
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/* ppm types.
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*/
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static char *magic_names[] = {
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"P1", /* pbm ... 1 band 1 bit, ascii */
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"P2", /* pgm ... 1 band many bit, ascii */
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"P3", /* ppm ... 3 band many bit, ascii */
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"P4", /* pbm ... 1 band 1 bit, binary */
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"P5", /* pgm ... 1 band 8 bit, binary */
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"P6", /* ppm ... 3 band 8 bit, binary */
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"PF", /* pfm ... 3 band 32 bit, binary */
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"Pf" /* pfm ... 1 band 32 bit, binary */
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};
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/* Shared with ppmsave.
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*/
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const char *vips__ppm_suffs[] = { ".ppm", ".pgm", ".pbm", ".pfm", NULL };
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static gboolean
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vips_foreign_load_ppm_is_a_stream( VipsStreami *streami )
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{
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const unsigned char *data;
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if( (data = vips_streami_sniff( streami, 2 )) ) {
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int i;
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for( i = 0; i < VIPS_NUMBER( magic_names ); i++ )
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if( vips_isprefix( magic_names[i], (char *) data ) )
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return( TRUE );
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}
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return( FALSE );
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}
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static int
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get_int( VipsBufis *bufis, int *i )
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{
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const char *txt;
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if( vips_bufis_skip_whitespace( bufis ) ||
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!(txt = vips_bufis_get_non_whitespace( bufis )) )
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return( -1 );
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*i = atoi( txt );
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return( 0 );
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}
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static int
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get_float( VipsBufis *bufis, float *f )
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{
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const char *txt;
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if( vips_bufis_skip_whitespace( bufis ) ||
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!(txt = vips_bufis_get_non_whitespace( bufis )) )
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return( -1 );
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/* We don't want the locale str -> float conversion.
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*/
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*f = g_ascii_strtod( txt, NULL );
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return( 0 );
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}
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static void
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vips_foreign_load_ppm_dispose( GObject *gobject )
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{
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) gobject;
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VIPS_UNREF( ppm->bufis );
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VIPS_UNREF( ppm->streami );
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G_OBJECT_CLASS( vips_foreign_load_ppm_parent_class )->
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dispose( gobject );
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}
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/* Scan the stream header into our class.
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*/
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static int
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vips_foreign_load_ppm_parse_header( VipsForeignLoadPpm *ppm )
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{
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VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( ppm );
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int i;
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char buf[2];
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/* Characteristics, indexed by ppm type.
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*/
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static int lookup_bits[] = {
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1, 8, 8, 1, 8, 8, 32, 32
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};
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static int lookup_bands[] = {
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1, 1, 3, 1, 1, 3, 3, 1
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};
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static int lookup_ascii[] = {
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1, 1, 1, 0, 0, 0, 0, 0
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};
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if( vips_streami_rewind( ppm->streami ) )
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return( -1 );
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/* Read in the magic number.
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*/
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buf[0] = VIPS_BUFIS_GETC( ppm->bufis );
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buf[1] = VIPS_BUFIS_GETC( ppm->bufis );
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for( i = 0; i < VIPS_NUMBER( magic_names ); i++ )
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if( vips_isprefix( magic_names[i], buf ) )
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break;
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if( i == VIPS_NUMBER( magic_names ) ) {
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vips_error( class->nickname, "%s", _( "bad magic number" ) );
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return( -1 );
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}
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ppm->index = i;
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ppm->bits = lookup_bits[i];
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ppm->bands = lookup_bands[i];
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ppm->ascii = lookup_ascii[i];
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/* Default ... can be changed below for PFM images.
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*/
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ppm->msb_first = 0;
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/* Read in size.
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*/
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if( get_int( ppm->bufis, &ppm->width ) ||
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get_int( ppm->bufis, &ppm->height ) )
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return( -1 );
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/* Read in max value / scale for >1 bit images.
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*/
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if( ppm->bits > 1 ) {
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if( ppm->index == 6 ||
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ppm->index == 7 ) {
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if( get_float( ppm->bufis, &ppm->scale ) )
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return( -1 );
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/* Scale > 0 means big-endian.
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*/
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ppm->msb_first = ppm->scale > 0;
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}
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else {
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if( get_int( ppm->bufis, &ppm->max_value ) )
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return( -1 );
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if( ppm->max_value > 255 )
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ppm->bits = 16;
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if( ppm->max_value > 65535 )
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ppm->bits = 32;
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}
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}
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/* For binary images, there is always exactly 1 more whitespace
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* character before the data starts.
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*/
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if( !ppm->ascii &&
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!isspace( VIPS_BUFIS_GETC( ppm->bufis ) ) ) {
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vips_error( class->nickname, "%s",
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_( "no whitespace before start of binary data" ) );
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return( -1 );
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}
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/* Choose a VIPS bandfmt.
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*/
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switch( ppm->bits ) {
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case 1:
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case 8:
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ppm->format = VIPS_FORMAT_UCHAR;
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break;
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case 16:
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ppm->format = VIPS_FORMAT_USHORT;
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break;
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case 32:
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if( ppm->index == 6 ||
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ppm->index == 7 )
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ppm->format = VIPS_FORMAT_FLOAT;
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else
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ppm->format = VIPS_FORMAT_UINT;
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break;
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default:
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g_assert_not_reached();
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/* Stop compiler warnings.
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*/
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ppm->format = VIPS_FORMAT_UCHAR;
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}
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if( ppm->bands == 1 ) {
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if( ppm->format == VIPS_FORMAT_USHORT )
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ppm->interpretation = VIPS_INTERPRETATION_GREY16;
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else
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ppm->interpretation = VIPS_INTERPRETATION_B_W;
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}
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else {
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if( ppm->format == VIPS_FORMAT_USHORT )
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ppm->interpretation = VIPS_INTERPRETATION_RGB16;
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else if( ppm->format == VIPS_FORMAT_UINT )
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ppm->interpretation = VIPS_INTERPRETATION_RGB;
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else
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ppm->interpretation = VIPS_INTERPRETATION_sRGB;
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}
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ppm->have_read_header = TRUE;
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return( 0 );
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}
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static VipsForeignFlags
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vips_foreign_load_ppm_get_flags( VipsForeignLoad *load )
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{
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) load;
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VipsForeignFlags flags;
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flags = 0;
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/* If this streami supports fast mmap and this PPM is >=8 bit binary,
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* then we can mmap the file and support partial load. Otherwise,
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* it's sequential.
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*/
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if( !ppm->have_read_header &&
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vips_foreign_load_ppm_parse_header( ppm ) )
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return( 0 );
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if( vips_streami_is_mappable( ppm->streami ) &&
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!ppm->ascii &&
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ppm->bits >= 8 )
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flags |= VIPS_FOREIGN_PARTIAL;
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else
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flags |= VIPS_FOREIGN_SEQUENTIAL;
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return( flags );
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}
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static void
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vips_foreign_load_ppm_set_image( VipsForeignLoadPpm *ppm, VipsImage *image )
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{
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vips_image_init_fields( image,
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ppm->width, ppm->height, ppm->bands, ppm->format,
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VIPS_CODING_NONE, ppm->interpretation, 1.0, 1.0 );
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vips_image_pipelinev( image, VIPS_DEMAND_STYLE_THINSTRIP, NULL );
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if( ppm->index == 6 ||
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ppm->index == 7 )
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vips_image_set_double( image,
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"pfm-scale", VIPS_FABS( ppm->scale ) );
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else
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vips_image_set_double( image,
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"ppm-max-value", VIPS_ABS( ppm->max_value ) );
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VIPS_SETSTR( image->filename,
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vips_stream_filename( VIPS_STREAM( ppm->bufis->streami ) ) );
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}
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static int
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vips_foreign_load_ppm_header( VipsForeignLoad *load )
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{
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) load;
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if( !ppm->have_read_header &&
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vips_foreign_load_ppm_parse_header( ppm ) )
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return( 0 );
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vips_foreign_load_ppm_set_image( ppm, load->out );
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vips_streami_minimise( ppm->streami );
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return( 0 );
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}
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/* Read a ppm/pgm file using mmap().
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*/
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static int
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vips_foreign_load_ppm_map( VipsForeignLoadPpm *ppm, VipsImage *image )
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{
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VipsImage **t = (VipsImage **)
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vips_object_local_array( VIPS_OBJECT( ppm ), 3 );
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gint64 header_offset;
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size_t length;
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const void *data;
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vips_bufis_unbuffer( ppm->bufis );
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header_offset = vips_streami_seek( ppm->streami, 0, SEEK_CUR );
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data = vips_streami_map( ppm->streami, &length );
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if( header_offset < 0 ||
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!data )
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return( -1 );
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data += header_offset;
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length -= header_offset;
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if( !(t[0] = vips_image_new_from_memory( data, length,
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ppm->width, ppm->height, ppm->bands, ppm->format )) )
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return( -1 );
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if( vips__byteswap_bool( t[0], &t[1],
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vips_amiMSBfirst() != ppm->msb_first ) ||
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vips_image_write( t[1], image ) )
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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_foreign_load_ppm_generate_binary( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRect *r = &or->valid;
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) a;
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VipsImage *image = or->im;
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size_t sizeof_line = VIPS_IMAGE_SIZEOF_LINE( image );
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int y;
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for( y = 0; y < r->height; y++ ) {
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VipsPel *q = VIPS_REGION_ADDR( or, 0, r->top + y );
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size_t bytes_read;
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bytes_read = vips_streami_read( ppm->streami, q, sizeof_line );
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if( bytes_read != sizeof_line ) {
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vips_error( "ppmload", "%s", _( "file truncated" ) );
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return( -1 );
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}
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}
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return( 0 );
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}
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static int
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vips_foreign_load_ppm_generate_1bit_ascii( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRect *r = &or->valid;
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) a;
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VipsImage *image = or->im;
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int x, y;
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for( y = 0; y < r->height; y++ ) {
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VipsPel *q = VIPS_REGION_ADDR( or, 0, r->top + y );
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for( x = 0; x < image->Xsize; x++ ) {
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int val;
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if( get_int( ppm->bufis, &val ) )
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return( -1 );
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if( val )
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q[x] = 0;
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else
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q[x] = 255;
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}
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}
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return( 0 );
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}
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|
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static int
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vips_foreign_load_ppm_generate_1bit_binary( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRect *r = &or->valid;
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) a;
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VipsImage *image = or->im;
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int x, y;
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int bits;
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bits = VIPS_BUFIS_GETC( ppm->bufis );
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for( y = 0; y < r->height; y++ ) {
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VipsPel *q = VIPS_REGION_ADDR( or, 0, r->top + y );
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for( x = 0; x < image->Xsize; x++ ) {
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q[x] = (bits & 128) ? 0 : 255;
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bits = VIPS_LSHIFT_INT( bits, 1 );
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if( (x & 7) == 7 )
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bits = VIPS_BUFIS_GETC( ppm->bufis );
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}
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/* Skip any unaligned bits at end of line.
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*/
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if( (x & 7) != 0 )
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bits = VIPS_BUFIS_GETC( ppm->bufis );
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}
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return( 0 );
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}
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|
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static int
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vips_foreign_load_ppm_generate_ascii_int( VipsRegion *or,
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void *seq, void *a, void *b, gboolean *stop )
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{
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VipsRect *r = &or->valid;
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VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) a;
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VipsImage *image = or->im;
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int n_elements = image->Xsize * image->Bands;
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int i, y;
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for( y = 0; y < r->height; y++ ) {
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VipsPel *q = VIPS_REGION_ADDR( or, r->left, r->top + y );
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for( i = 0; i < n_elements; i++ ) {
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int val;
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|
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if( get_int( ppm->bufis, &val ) )
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return( -1 );
|
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|
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switch( image->BandFmt ) {
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case VIPS_FORMAT_UCHAR:
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q[i] = VIPS_CLIP( 0, val, 255 );
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break;
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case VIPS_FORMAT_USHORT:
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((unsigned short *) q)[i] =
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VIPS_CLIP( 0, val, 65535 );
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break;
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case VIPS_FORMAT_UINT:
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((unsigned int *) q)[i] = val;
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break;
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|
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default:
|
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g_assert_not_reached();
|
|
}
|
|
}
|
|
}
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|
|
return( 0 );
|
|
}
|
|
|
|
typedef int (*VipsPpmLoaderFn)( VipsForeignLoadPpm *ppm, VipsImage *image );
|
|
|
|
static int
|
|
vips_foreign_load_ppm_load( VipsForeignLoad *load )
|
|
{
|
|
VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) load;
|
|
VipsImage **t = (VipsImage **)
|
|
vips_object_local_array( (VipsObject *) load, 2 );
|
|
|
|
if( !ppm->have_read_header &&
|
|
vips_foreign_load_ppm_parse_header( ppm ) )
|
|
return( 0 );
|
|
|
|
/* If the stream is mappable and this is a binary file, we can map it.
|
|
*/
|
|
if( vips_streami_is_mappable( ppm->streami ) &&
|
|
!ppm->ascii &&
|
|
ppm->bits >= 8 ) {
|
|
if( vips_foreign_load_ppm_map( ppm, load->real ) )
|
|
return( -1 );
|
|
}
|
|
else {
|
|
VipsGenerateFn generate;
|
|
|
|
/* What sort of read are we doing?
|
|
*/
|
|
if( !ppm->ascii && ppm->bits >= 8 ) {
|
|
generate = vips_foreign_load_ppm_generate_binary;
|
|
|
|
/* The binary loader does not use the buffered IO
|
|
* object.
|
|
*/
|
|
vips_bufis_unbuffer( ppm->bufis );
|
|
}
|
|
else if( !ppm->ascii && ppm->bits == 1 )
|
|
generate = vips_foreign_load_ppm_generate_1bit_binary;
|
|
else if( ppm->ascii && ppm->bits == 1 )
|
|
generate = vips_foreign_load_ppm_generate_1bit_ascii;
|
|
else
|
|
generate = vips_foreign_load_ppm_generate_ascii_int;
|
|
|
|
t[0] = vips_image_new();
|
|
vips_foreign_load_ppm_set_image( ppm, t[0] );
|
|
if( vips_image_generate( t[0],
|
|
NULL, generate, NULL, ppm, NULL ) ||
|
|
vips_sequential( t[0], &t[1], NULL ) ||
|
|
vips_image_write( t[1], load->real ) )
|
|
return( -1 );
|
|
}
|
|
|
|
if( vips_streami_decode( ppm->streami ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_ppm_class_init( VipsForeignLoadPpmClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->dispose = vips_foreign_load_ppm_dispose;
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "ppmload_base";
|
|
object_class->description = _( "load ppm base class" );
|
|
|
|
foreign_class->suffs = vips__ppm_suffs;
|
|
|
|
/* We are fast at is_a(), so high priority.
|
|
*/
|
|
foreign_class->priority = 200;
|
|
|
|
load_class->get_flags = vips_foreign_load_ppm_get_flags;
|
|
load_class->header = vips_foreign_load_ppm_header;
|
|
load_class->load = vips_foreign_load_ppm_load;
|
|
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_ppm_init( VipsForeignLoadPpm *ppm )
|
|
{
|
|
ppm->scale = 1.0;
|
|
}
|
|
|
|
typedef struct _VipsForeignLoadPpmFile {
|
|
VipsForeignLoadPpm parent_object;
|
|
|
|
char *filename;
|
|
|
|
} VipsForeignLoadPpmFile;
|
|
|
|
typedef VipsForeignLoadPpmClass VipsForeignLoadPpmFileClass;
|
|
|
|
G_DEFINE_TYPE( VipsForeignLoadPpmFile, vips_foreign_load_ppm_file,
|
|
vips_foreign_load_ppm_get_type() );
|
|
|
|
static gboolean
|
|
vips_foreign_load_ppm_file_is_a( const char *filename )
|
|
{
|
|
VipsStreami *streami;
|
|
gboolean result;
|
|
|
|
if( !(streami = vips_streami_new_from_file( filename )) )
|
|
return( FALSE );
|
|
result = vips_foreign_load_ppm_is_a_stream( streami );
|
|
VIPS_UNREF( streami );
|
|
|
|
return( result );
|
|
}
|
|
|
|
static int
|
|
vips_foreign_load_ppm_file_build( VipsObject *object )
|
|
{
|
|
VipsForeignLoadPpmFile *file = (VipsForeignLoadPpmFile *) object;
|
|
VipsForeignLoadPpm *ppm = (VipsForeignLoadPpm *) object;
|
|
|
|
if( file->filename ) {
|
|
if( !(ppm->streami =
|
|
vips_streami_new_from_file( file->filename )) )
|
|
return( -1 );
|
|
ppm->bufis = vips_bufis_new_from_streami( ppm->streami );
|
|
}
|
|
|
|
if( VIPS_OBJECT_CLASS( vips_foreign_load_ppm_file_parent_class )->
|
|
build( object ) )
|
|
return( -1 );
|
|
|
|
return( 0 );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_ppm_file_class_init( VipsForeignLoadPpmClass *class )
|
|
{
|
|
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
|
|
VipsObjectClass *object_class = (VipsObjectClass *) class;
|
|
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
|
|
|
|
gobject_class->set_property = vips_object_set_property;
|
|
gobject_class->get_property = vips_object_get_property;
|
|
|
|
object_class->nickname = "ppmload";
|
|
object_class->description = _( "load ppm from file" );
|
|
object_class->build = vips_foreign_load_ppm_file_build;
|
|
|
|
load_class->is_a = vips_foreign_load_ppm_file_is_a;
|
|
|
|
VIPS_ARG_STRING( class, "filename", 1,
|
|
_( "Filename" ),
|
|
_( "Filename to load from" ),
|
|
VIPS_ARGUMENT_REQUIRED_INPUT,
|
|
G_STRUCT_OFFSET( VipsForeignLoadPpmFile, filename ),
|
|
NULL );
|
|
}
|
|
|
|
static void
|
|
vips_foreign_load_ppm_file_init( VipsForeignLoadPpmFile *file )
|
|
{
|
|
}
|
|
|
|
#endif /*HAVE_PPM*/
|
|
|
|
/**
|
|
* vips_ppmload:
|
|
* @filename: file to load
|
|
* @out: (out): output image
|
|
* @...: %NULL-terminated list of optional named arguments
|
|
*
|
|
* Read a PPM/PBM/PGM/PFM file into a VIPS image.
|
|
*
|
|
* It can read 1, 8, 16 and 32 bit images, colour or monochrome,
|
|
* stored in binary or in ASCII. One bit images become 8 bit VIPS images,
|
|
* with 0 and 255 for 0 and 1.
|
|
*
|
|
* See also: vips_image_new_from_file().
|
|
*
|
|
* Returns: 0 on success, -1 on error.
|
|
*/
|
|
int
|
|
vips_ppmload( const char *filename, VipsImage **out, ... )
|
|
{
|
|
va_list ap;
|
|
int result;
|
|
|
|
va_start( ap, out );
|
|
result = vips_call_split( "ppmload", ap, filename, out );
|
|
va_end( ap );
|
|
|
|
return( result );
|
|
}
|
|
|