156 lines
3.3 KiB
C
156 lines
3.3 KiB
C
/* Convert 1 or 3-band 8-bit VIPS images to/from JPEG.
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*
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* 30/11/11
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* - now 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., 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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/*
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#define DEBUG_VERBOSE
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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 <stdlib.h>
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#include <vips/vips.h>
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int
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im_jpeg2vips( const char *name, IMAGE *out )
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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 shrink;
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gboolean fail_on_warn;
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VipsImage *t;
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/* By default, we ignore any warnings. We want to get as much of
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* the user's data as we can.
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*/
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fail_on_warn = FALSE;
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/* Parse the filename.
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*/
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im_filename_split( name, filename, mode );
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p = &mode[0];
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shrink = 1;
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if( (q = im_getnextoption( &p )) ) {
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shrink = atoi( q );
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if( shrink != 1 && shrink != 2 &&
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shrink != 4 && shrink != 8 ) {
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im_error( "im_jpeg2vips",
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_( "bad shrink factor %d" ), shrink );
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return( -1 );
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}
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}
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if( (q = im_getnextoption( &p )) ) {
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if( im_isprefix( "fail", q ) )
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fail_on_warn = TRUE;
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}
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if( vips_jpegload( filename, &t,
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"shrink", shrink,
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"fail", fail_on_warn,
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NULL ) )
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return( -1 );
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if( vips_image_write( t, out ) ) {
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g_object_unref( t );
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return( -1 );
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}
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g_object_unref( t );
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return( 0 );
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}
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int
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im_bufjpeg2vips( void *buf, size_t len, IMAGE *out, gboolean header_only )
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{
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VipsImage *t;
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/* header_only is now automatic ... this call will only decompress on
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* pixel access.
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*/
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if( vips_jpegload_buffer( buf, len, &t, NULL ) )
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return( -1 );
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if( vips_image_write( t, out ) ) {
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g_object_unref( t );
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return( -1 );
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}
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g_object_unref( t );
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return( 0 );
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}
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static int
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isjpeg( const char *name )
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{
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char filename[FILENAME_MAX];
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char mode[FILENAME_MAX];
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im_filename_split( name, filename, mode );
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return( vips_foreign_is_a( "jpegload", filename ) );
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}
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static const char *jpeg_suffs[] = { ".jpg", ".jpeg", ".jpe", NULL };
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/* jpeg format adds no new members.
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*/
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typedef VipsFormat VipsFormatJpeg;
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typedef VipsFormatClass VipsFormatJpegClass;
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static void
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vips_format_jpeg_class_init( VipsFormatJpegClass *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 = "jpeg";
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object_class->description = _( "JPEG" );
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format_class->is_a = isjpeg;
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format_class->load = im_jpeg2vips;
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format_class->save = im_vips2jpeg;
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format_class->suffs = jpeg_suffs;
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}
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static void
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vips_format_jpeg_init( VipsFormatJpeg *object )
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{
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}
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G_DEFINE_TYPE( VipsFormatJpeg, vips_format_jpeg, VIPS_TYPE_FORMAT );
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