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/* Convert 1 to 4-band 8 or 16-bit VIPS images to/from PNG.
*
* 19/12/11
* - just a stub
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <vips/vips.h>
#include <vips/internal.h>
#include "../foreign/vipspng.h"
static int
png2vips( const char *name, IMAGE *out, gboolean header_only )
{
char filename[FILENAME_MAX];
char mode[FILENAME_MAX];
char *p, *q;
int seq;
im_filename_split( name, filename, mode );
seq = 0;
p = &mode[0];
if( (q = im_getnextoption( &p )) ) {
if( im_isprefix( "seq", q ) )
seq = 1;
}
/* We need to be compatible with the pre-sequential mode
* im_png2vips(). This returned a "t" if given a "p" image, since it
* used writeline.
*
* If we're writing the image to a "p", switch it to a "t".
*
* Don't do this for header read, since we don't want to force a
* malloc if all we are doing is looking at fields.
*/
if( !header_only &&
!seq &&
out->dtype == VIPS_IMAGE_PARTIAL ) {
if( vips__image_wio_output( out ) )
return( -1 );
}
#ifdef HAVE_PNG
if( header_only ) {
if( vips__png_header( filename, out ) )
return( -1 );
}
else {
if( vips__png_read( filename, out, TRUE ) )
return( -1 );
}
#else
vips_error( "im_png2vips",
"%s", _( "no PNG support in your libvips" ) );
return( -1 );
#endif /*HAVE_PNG*/
return( 0 );
}
int
im_png2vips( const char *name, IMAGE *out )
{
return( png2vips( name, out, FALSE ) );
}
/* By having a separate header func, we get lazy.c to open via disc/mem.
*/
static int
im_png2vips_header( const char *name, IMAGE *out )
{
return( png2vips( name, out, TRUE ) );
}
static int
ispng( const char *filename )
{
return( vips_foreign_is_a( "pngload", filename ) );
}
static const char *png_suffs[] = { ".png", NULL };
typedef VipsFormat VipsFormatPng;
typedef VipsFormatClass VipsFormatPngClass;
static void
vips_format_png_class_init( VipsFormatPngClass *class )
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsFormatClass *format_class = (VipsFormatClass *) class;
object_class->nickname = "png";
object_class->description = _( "PNG" );
format_class->is_a = ispng;
format_class->header = im_png2vips_header;
format_class->load = im_png2vips;
format_class->save = im_vips2png;
format_class->suffs = png_suffs;
}
static void
vips_format_png_init( VipsFormatPng *object )
{
}
G_DEFINE_TYPE( VipsFormatPng, vips_format_png, VIPS_TYPE_FORMAT );
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