150 lines
3.3 KiB
C
150 lines
3.3 KiB
C
/* Convert 1 to 4-band 8 or 16-bit VIPS images to/from PNG.
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*
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* 19/12/11
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* - just a stub
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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 <stdio.h>
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#include <vips/vips.h>
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#include <vips/internal.h>
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#include "../foreign/vipspng.h"
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static int
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png2vips( const char *name, IMAGE *out, gboolean header_only )
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{
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char filename[FILENAME_MAX];
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char mode[FILENAME_MAX];
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char *p, *q;
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int seq;
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im_filename_split( name, filename, mode );
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seq = 0;
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p = &mode[0];
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if( (q = im_getnextoption( &p )) ) {
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if( im_isprefix( "seq", q ) )
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seq = 1;
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}
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/* We need to be compatible with the pre-sequential mode
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* im_png2vips(). This returned a "t" if given a "p" image, since it
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* used writeline.
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*
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* If we're writing the image to a "p", switch it to a "t".
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*
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* Don't do this for header read, since we don't want to force a
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* malloc if all we are doing is looking at fields.
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*/
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if( !header_only &&
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!seq &&
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out->dtype == VIPS_IMAGE_PARTIAL ) {
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if( vips__image_wio_output( out ) )
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return( -1 );
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}
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#ifdef HAVE_PNG
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if( header_only ) {
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if( vips__png_header( filename, out ) )
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return( -1 );
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}
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else {
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if( vips__png_read( filename, out, TRUE ) )
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return( -1 );
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}
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#else
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vips_error( "im_png2vips", _( "no PNG support in your libvips" ) );
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return( -1 );
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#endif /*HAVE_PNG*/
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return( 0 );
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}
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int
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im_png2vips( const char *name, IMAGE *out )
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{
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return( png2vips( name, out, FALSE ) );
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}
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/* By having a separate header func, we get lazy.c to open via disc/mem.
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*/
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static int
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im_png2vips_header( const char *name, IMAGE *out )
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{
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return( png2vips( name, out, TRUE ) );
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}
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static int
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ispng( const char *filename )
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{
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return( vips_foreign_is_a( "pngload", filename ) );
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}
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static const char *png_suffs[] = { ".png", NULL };
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typedef VipsFormat VipsFormatPng;
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typedef VipsFormatClass VipsFormatPngClass;
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static void
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vips_format_png_class_init( VipsFormatPngClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsFormatClass *format_class = (VipsFormatClass *) class;
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object_class->nickname = "png";
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object_class->description = _( "PNG" );
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format_class->is_a = ispng;
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format_class->header = im_png2vips_header;
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format_class->load = im_png2vips;
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format_class->save = im_vips2png;
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format_class->suffs = png_suffs;
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}
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static void
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vips_format_png_init( VipsFormatPng *object )
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{
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}
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G_DEFINE_TYPE( VipsFormatPng, vips_format_png, VIPS_TYPE_FORMAT );
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