407 lines
11 KiB
C
407 lines
11 KiB
C
/* load jpeg from a file
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*
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* 24/11/11
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* - wrap a class around the jpeg writer
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* 29/11/11
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* - split to make load, load from buffer and load from file
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <setjmp.h>
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#ifdef HAVE_EXIF
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#ifdef UNTAGGED_EXIF
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#include <exif-data.h>
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#include <exif-loader.h>
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#include <exif-ifd.h>
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#include <exif-utils.h>
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#else /*!UNTAGGED_EXIF*/
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#include <libexif/exif-data.h>
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#include <libexif/exif-loader.h>
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#include <libexif/exif-ifd.h>
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#include <libexif/exif-utils.h>
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#endif /*UNTAGGED_EXIF*/
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#endif /*HAVE_EXIF*/
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#include <vips/vips.h>
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#include <vips/buf.h>
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#include <vips/internal.h>
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/* jpeglib includes jconfig.h, which can define HAVE_STDLIB_H ... which we
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* also define. Make sure it's turned off.
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*/
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#ifdef HAVE_STDLIB_H
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#undef HAVE_STDLIB_H
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#endif /*HAVE_STDLIB_H*/
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#include <jpeglib.h>
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#include <jerror.h>
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#include "jpeg.h"
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typedef struct _VipsForeignLoadJpeg {
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VipsForeignLoad parent_object;
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/* Shrink by this much during load.
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*/
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int shrink;
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/* Fail on first warning.
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*/
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gboolean fail;
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} VipsForeignLoadJpeg;
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typedef VipsForeignLoadClass VipsForeignLoadJpegClass;
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G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadJpeg, vips_foreign_load_jpeg,
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VIPS_TYPE_FOREIGN_LOAD );
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static int
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vips_foreign_load_jpeg_build( VipsObject *object )
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{
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VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) object;
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if( jpeg->shrink != 1 &&
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jpeg->shrink != 2 &&
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jpeg->shrink != 4 &&
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jpeg->shrink != 8 ) {
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vips_error( "VipsFormatLoadJpeg",
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_( "bad shrink factor %d" ), jpeg->shrink );
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return( -1 );
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}
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if( VIPS_OBJECT_CLASS( vips_foreign_load_jpeg_parent_class )->
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build( object ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_foreign_load_jpeg_class_init( VipsForeignLoadJpegClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "jpegload_base";
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object_class->description = _( "load jpeg" );
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object_class->build = vips_foreign_load_jpeg_build;
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VIPS_ARG_INT( class, "shrink", 10,
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_( "Shrink" ),
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_( "Shrink factor on load" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadJpeg, shrink ),
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1, 16, 1 );
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VIPS_ARG_BOOL( class, "fail", 11,
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_( "Fail" ),
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_( "Fail on first warning" ),
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VIPS_ARGUMENT_OPTIONAL_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadJpeg, fail ),
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FALSE );
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}
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static void
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vips_foreign_load_jpeg_init( VipsForeignLoadJpeg *jpeg )
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{
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jpeg->shrink = 1;
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}
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typedef struct _VipsForeignLoadJpegFile {
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VipsForeignLoadJpeg parent_object;
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/* Filename for load.
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*/
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char *filename;
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} VipsForeignLoadJpegFile;
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typedef VipsForeignLoadJpegClass VipsForeignLoadJpegFileClass;
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G_DEFINE_TYPE( VipsForeignLoadJpegFile, vips_foreign_load_jpeg_file,
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vips_foreign_load_jpeg_get_type() );
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static gboolean
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vips_foreign_load_jpeg_file_is_a( const char *filename )
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{
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return( vips__isjpeg( filename ) );
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}
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static int
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vips_foreign_load_jpeg_file_header( VipsForeignLoad *load )
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{
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VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
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VipsForeignLoadJpegFile *file = (VipsForeignLoadJpegFile *) load;
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if( vips__jpeg_read_file( file->filename, load->out,
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TRUE, jpeg->shrink, jpeg->fail ) )
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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_jpeg_file_load( VipsForeignLoad *load )
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{
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VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
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VipsForeignLoadJpegFile *file = (VipsForeignLoadJpegFile *) load;
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if( vips__jpeg_read_file( file->filename, load->real,
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FALSE, jpeg->shrink, jpeg->fail ) )
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return( -1 );
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return( 0 );
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}
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static const char *jpeg_suffs[] = { ".jpg", ".jpeg", ".jpe", NULL };
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static void
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vips_foreign_load_jpeg_file_class_init( VipsForeignLoadJpegFileClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignClass *foreign_class = (VipsForeignClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "jpegload";
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object_class->description = _( "load jpeg from file" );
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foreign_class->suffs = jpeg_suffs;
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load_class->is_a = vips_foreign_load_jpeg_file_is_a;
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load_class->header = vips_foreign_load_jpeg_file_header;
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load_class->load = vips_foreign_load_jpeg_file_load;
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VIPS_ARG_STRING( class, "filename", 1,
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_( "Filename" ),
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_( "Filename to load from" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadJpegFile, filename ),
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NULL );
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}
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static void
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vips_foreign_load_jpeg_file_init( VipsForeignLoadJpegFile *file )
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{
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}
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/**
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* vips_jpegload:
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* @filename: file to load
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* @out: decompressed image
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* @flags: image flags
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* @shrink: shrink by this much on load
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* @fail: fail on warnings
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* @...: %NULL-terminated list of optional named arguments
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*
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* Read a JPEG file into a VIPS image. It can read most 8-bit JPEG images,
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* including CMYK and YCbCr.
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*
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* @shrink means shrink by this integer factor during load. Possible values
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* are 1, 2, 4 and 8. Shrinking during read is very much faster than
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* decompressing the whole image and then shrinking later.
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*
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* Setting @fail to true makes the JPEG reader fail on any warnings.
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* This can be useful for detecting truncated files, for example. Normally
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* reading these produces a warning, but no fatal error.
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*
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* Example:
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*
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* |[
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* vips_jpegload( "fred.jpg", &out,
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* "shrink", 8,
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* "fail", TRUE,
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* NULL );
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* ]|
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*
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* Any embedded ICC profiles are ignored: you always just get the RGB from
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* the file. Instead, the embedded profile will be attached to the image as
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* metadata. You need to use something like im_icc_import() to get CIE
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* values from the file. Any EXIF data is also attached as VIPS metadata.
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*
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* The int metadata item "jpeg-multiscan" is set to the result of
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* jpeg_has_multiple_scans(). Interlaced jpeg images need a large amount of
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* memory to load, so this field gives callers a chance to handle these
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* images differently.
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*
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* The EXIF thumbnail, if present, is attached to the image as
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* "jpeg-thumbnail-data". See vips_image_get_blob().
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*
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* This function only reads the image header and does not decompress any pixel
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* data. Decompression only occurs when pixels are accessed by some other
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* function.
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*
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* See also: vips_jpegload_buffer(), vips_image_new_from_file().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_jpegload( const char *filename, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "jpegload", ap, filename, out );
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va_end( ap );
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return( result );
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}
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typedef struct _VipsForeignLoadJpegBuffer {
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VipsForeignLoadJpeg parent_object;
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/* Load from a buffer.
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*/
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VipsArea *buf;
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} VipsForeignLoadJpegBuffer;
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typedef VipsForeignLoadJpegClass VipsForeignLoadJpegBufferClass;
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G_DEFINE_TYPE( VipsForeignLoadJpegBuffer, vips_foreign_load_jpeg_buffer,
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vips_foreign_load_jpeg_get_type() );
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static int
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vips_foreign_load_jpeg_buffer_header( VipsForeignLoad *load )
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{
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VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
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VipsForeignLoadJpegBuffer *buffer = (VipsForeignLoadJpegBuffer *) load;
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if( vips__jpeg_read_buffer( buffer->buf->data, buffer->buf->length,
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load->out, TRUE, jpeg->shrink, jpeg->fail ) )
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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_jpeg_buffer_load( VipsForeignLoad *load )
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{
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VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
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VipsForeignLoadJpegBuffer *buffer = (VipsForeignLoadJpegBuffer *) load;
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if( vips__jpeg_read_buffer( buffer->buf->data, buffer->buf->length,
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load->real, FALSE, jpeg->shrink, jpeg->fail ) )
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return( -1 );
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return( 0 );
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}
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static void
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vips_foreign_load_jpeg_buffer_class_init(
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VipsForeignLoadJpegBufferClass *class )
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS( class );
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
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gobject_class->set_property = vips_object_set_property;
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gobject_class->get_property = vips_object_get_property;
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object_class->nickname = "jpegload_buffer";
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object_class->description = _( "load jpeg from buffer" );
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load_class->header = vips_foreign_load_jpeg_buffer_header;
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load_class->load = vips_foreign_load_jpeg_buffer_load;
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VIPS_ARG_BOXED( class, "buffer", 1,
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_( "Buffer" ),
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_( "Buffer to load from" ),
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VIPS_ARGUMENT_REQUIRED_INPUT,
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G_STRUCT_OFFSET( VipsForeignLoadJpegBuffer, buf ),
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VIPS_TYPE_BLOB );
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}
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static void
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vips_foreign_load_jpeg_buffer_init( VipsForeignLoadJpegBuffer *buffer )
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{
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}
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/**
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* vips_jpegload_buffer:
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* @buf: memory area to load
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* @len: size of memory area
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* @out: image to write
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* @...: %NULL-terminated list of optional named arguments
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*
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* Read a JPEG-formatted memory block into a VIPS image. It can read most
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* 8-bit JPEG images, including CMYK and YCbCr.
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*
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* This function is handy for processing JPEG image thumbnails.
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*
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* Caution: on return only the header will have been read, the pixel data is
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* not decompressed until the first pixel is read. Therefore you must not free
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* @buf until you have read pixel data from @out.
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*
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* See also: vips_jpegload().
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*
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* Returns: 0 on success, -1 on error.
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*/
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int
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vips_jpegload_buffer( void *buf, size_t len, VipsImage **out, ... )
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{
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va_list ap;
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VipsArea *area;
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int result;
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/* We don't take a copy of the data or free it.
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*/
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area = vips_area_new_blob( NULL, buf, len );
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va_start( ap, out );
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result = vips_call_split( "jpegload_buffer", ap, area, out );
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va_end( ap );
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vips_area_unref( area );
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return( result );
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}
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