151 lines
3.3 KiB
C
151 lines
3.3 KiB
C
/* 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/pforeign.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 ) )
|
|
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 );
|
|
|