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jpegload.c
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jpegload.c
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/* load jpeg from a file
*
* 24/11/11
* - wrap a class around the jpeg writer
* 29/11/11
* - split to make load, load from buffer and load from file
*/
/*
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <vips/vips.h>
#include <vips/buf.h>
#include <vips/internal.h>
#include "pforeign.h"
#ifdef HAVE_JPEG
#ifdef HAVE_EXIF
#ifdef UNTAGGED_EXIF
#include <exif-data.h>
#include <exif-loader.h>
#include <exif-ifd.h>
#include <exif-utils.h>
#else /*!UNTAGGED_EXIF*/
#include <libexif/exif-data.h>
#include <libexif/exif-loader.h>
#include <libexif/exif-ifd.h>
#include <libexif/exif-utils.h>
#endif /*UNTAGGED_EXIF*/
#endif /*HAVE_EXIF*/
typedef struct _VipsForeignLoadJpeg {
VipsForeignLoad parent_object;
/* Set by subclasses.
*/
VipsSource *source;
/* Shrink by this much during load.
*/
int shrink;
/* Autorotate using exif orientation tag.
*/
gboolean autorotate;
} VipsForeignLoadJpeg;
typedef VipsForeignLoadClass VipsForeignLoadJpegClass;
G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadJpeg, vips_foreign_load_jpeg,
VIPS_TYPE_FOREIGN_LOAD );
static void
vips_foreign_load_jpeg_dispose( GObject *gobject )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) gobject;
VIPS_UNREF( jpeg->source );
G_OBJECT_CLASS( vips_foreign_load_jpeg_parent_class )->
dispose( gobject );
}
static int
vips_foreign_load_jpeg_build( VipsObject *object )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) object;
if( jpeg->shrink != 1 &&
jpeg->shrink != 2 &&
jpeg->shrink != 4 &&
jpeg->shrink != 8 ) {
vips_error( "VipsFormatLoadJpeg",
_( "bad shrink factor %d" ), jpeg->shrink );
return( -1 );
}
if( VIPS_OBJECT_CLASS( vips_foreign_load_jpeg_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static VipsForeignFlags
vips_foreign_load_jpeg_get_flags( VipsForeignLoad *load )
{
return( VIPS_FOREIGN_SEQUENTIAL );
}
static VipsForeignFlags
vips_foreign_load_jpeg_get_flags_filename( const char *filename )
{
return( VIPS_FOREIGN_SEQUENTIAL );
}
static int
vips_foreign_load_jpeg_header( VipsForeignLoad *load )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
if( vips__jpeg_read_source( jpeg->source,
load->out, TRUE, jpeg->shrink, load->fail, jpeg->autorotate ) )
return( -1 );
return( 0 );
}
static int
vips_foreign_load_jpeg_load( VipsForeignLoad *load )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) load;
if( vips__jpeg_read_source( jpeg->source,
load->real, FALSE, jpeg->shrink, load->fail,
jpeg->autorotate ) )
return( -1 );
return( 0 );
}
static void
vips_foreign_load_jpeg_class_init( VipsForeignLoadJpegClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
gobject_class->dispose = vips_foreign_load_jpeg_dispose;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "jpegload_base";
object_class->description = _( "load jpeg" );
object_class->build = vips_foreign_load_jpeg_build;
/* We are fast at is_a(), so high priority.
*/
foreign_class->priority = 50;
load_class->get_flags_filename =
vips_foreign_load_jpeg_get_flags_filename;
load_class->get_flags = vips_foreign_load_jpeg_get_flags;
load_class->header = vips_foreign_load_jpeg_header;
load_class->load = vips_foreign_load_jpeg_load;
VIPS_ARG_INT( class, "shrink", 20,
_( "Shrink" ),
_( "Shrink factor on load" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadJpeg, shrink ),
1, 16, 1 );
VIPS_ARG_BOOL( class, "autorotate", 21,
_( "Autorotate" ),
_( "Rotate image using exif orientation" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadJpeg, autorotate ),
FALSE );
}
static void
vips_foreign_load_jpeg_init( VipsForeignLoadJpeg *jpeg )
{
jpeg->shrink = 1;
}
typedef struct _VipsForeignLoadJpegSource {
VipsForeignLoadJpeg parent_object;
VipsSource *source;
} VipsForeignLoadJpegSource;
typedef VipsForeignLoadJpegClass VipsForeignLoadJpegSourceClass;
G_DEFINE_TYPE( VipsForeignLoadJpegSource, vips_foreign_load_jpeg_source,
vips_foreign_load_jpeg_get_type() );
static int
vips_foreign_load_jpeg_source_build( VipsObject *object )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) object;
VipsForeignLoadJpegSource *source =
(VipsForeignLoadJpegSource *) object;
if( source->source ) {
jpeg->source = source->source;
g_object_ref( jpeg->source );
}
if( VIPS_OBJECT_CLASS( vips_foreign_load_jpeg_source_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static gboolean
vips_foreign_load_jpeg_source_is_a_source( VipsSource *source )
{
return( vips__isjpeg_source( source ) );
}
static void
vips_foreign_load_jpeg_source_class_init(
VipsForeignLoadJpegSourceClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "jpegload_source";
object_class->description = _( "load image from jpeg source" );
object_class->build = vips_foreign_load_jpeg_source_build;
load_class->is_a_source = vips_foreign_load_jpeg_source_is_a_source;
VIPS_ARG_OBJECT( class, "source", 1,
_( "Source" ),
_( "Source to load from" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadJpegSource, source ),
VIPS_TYPE_SOURCE );
}
static void
vips_foreign_load_jpeg_source_init( VipsForeignLoadJpegSource *source )
{
}
typedef struct _VipsForeignLoadJpegFile {
VipsForeignLoadJpeg parent_object;
char *filename;
} VipsForeignLoadJpegFile;
typedef VipsForeignLoadJpegClass VipsForeignLoadJpegFileClass;
G_DEFINE_TYPE( VipsForeignLoadJpegFile, vips_foreign_load_jpeg_file,
vips_foreign_load_jpeg_get_type() );
static int
vips_foreign_load_jpeg_file_build( VipsObject *object )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) object;
VipsForeignLoadJpegFile *file = (VipsForeignLoadJpegFile *) object;
if( file->filename &&
!(jpeg->source =
vips_source_new_from_file( file->filename )) )
return( -1 );
if( VIPS_OBJECT_CLASS( vips_foreign_load_jpeg_file_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static gboolean
vips_foreign_load_jpeg_file_is_a( const char *filename )
{
VipsSource *source;
gboolean result;
if( !(source = vips_source_new_from_file( filename )) )
return( FALSE );
result = vips_foreign_load_jpeg_source_is_a_source( source );
VIPS_UNREF( source );
return( result );
}
static void
vips_foreign_load_jpeg_file_class_init( VipsForeignLoadJpegFileClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignClass *foreign_class = (VipsForeignClass *) class;
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "jpegload";
object_class->description = _( "load jpeg from file" );
object_class->build = vips_foreign_load_jpeg_file_build;
foreign_class->suffs = vips__jpeg_suffs;
load_class->is_a = vips_foreign_load_jpeg_file_is_a;
VIPS_ARG_STRING( class, "filename", 1,
_( "Filename" ),
_( "Filename to load from" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadJpegFile, filename ),
NULL );
}
static void
vips_foreign_load_jpeg_file_init( VipsForeignLoadJpegFile *file )
{
}
typedef struct _VipsForeignLoadJpegBuffer {
VipsForeignLoadJpeg parent_object;
VipsBlob *blob;
} VipsForeignLoadJpegBuffer;
typedef VipsForeignLoadJpegClass VipsForeignLoadJpegBufferClass;
G_DEFINE_TYPE( VipsForeignLoadJpegBuffer, vips_foreign_load_jpeg_buffer,
vips_foreign_load_jpeg_get_type() );
static int
vips_foreign_load_jpeg_buffer_build( VipsObject *object )
{
VipsForeignLoadJpeg *jpeg = (VipsForeignLoadJpeg *) object;
VipsForeignLoadJpegBuffer *buffer =
(VipsForeignLoadJpegBuffer *) object;
if( buffer->blob &&
!(jpeg->source = vips_source_new_from_memory(
VIPS_AREA( buffer->blob )->data,
VIPS_AREA( buffer->blob )->length )) )
return( -1 );
if( VIPS_OBJECT_CLASS( vips_foreign_load_jpeg_buffer_parent_class )->
build( object ) )
return( -1 );
return( 0 );
}
static gboolean
vips_foreign_load_jpeg_buffer_is_a_buffer( const void *buf, size_t len )
{
VipsSource *source;
gboolean result;
if( !(source = vips_source_new_from_memory( buf, len )) )
return( FALSE );
result = vips_foreign_load_jpeg_source_is_a_source( source );
VIPS_UNREF( source );
return( result );
}
static void
vips_foreign_load_jpeg_buffer_class_init(
VipsForeignLoadJpegBufferClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "jpegload_buffer";
object_class->description = _( "load jpeg from buffer" );
object_class->build = vips_foreign_load_jpeg_buffer_build;
load_class->is_a_buffer = vips_foreign_load_jpeg_buffer_is_a_buffer;
VIPS_ARG_BOXED( class, "buffer", 1,
_( "Buffer" ),
_( "Buffer to load from" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsForeignLoadJpegBuffer, blob ),
VIPS_TYPE_BLOB );
}
static void
vips_foreign_load_jpeg_buffer_init( VipsForeignLoadJpegBuffer *buffer )
{
}
#endif /*HAVE_JPEG*/
/**
* vips_jpegload:
* @filename: file to load
* @out: (out): decompressed image
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @shrink: %gint, shrink by this much on load
* * @fail: %gboolean, fail on errors
* * @autorotate: %gboolean, rotate image upright during load
*
* Read a JPEG file into a VIPS image. It can read most 8-bit JPEG images,
* including CMYK and YCbCr.
*
* @shrink means shrink by this integer factor during load. Possible values
* are 1, 2, 4 and 8. Shrinking during read is very much faster than
* decompressing the whole image and then shrinking later.
*
* Setting @fail to %TRUE makes the JPEG reader fail on any errors.
* This can be useful for detecting truncated files, for example. Normally
* reading these produces a warning, but no fatal error.
*
* Setting @autorotate to %TRUE will make the loader interpret the
* orientation tag and automatically rotate the image appropriately during
* load.
*
* If @autorotate is %FALSE, the metadata field #VIPS_META_ORIENTATION is set
* to the value of the orientation tag. Applications may read and interpret
* this field
* as they wish later in processing. See vips_autorot(). Save
* operations will use #VIPS_META_ORIENTATION, if present, to set the
* orientation of output images.
*
* Example:
*
* |[
* vips_jpegload( "fred.jpg", &out,
* "shrink", 8,
* "fail", TRUE,
* NULL );
* ]|
*
* Any embedded ICC profiles are ignored: you always just get the RGB from
* the file. Instead, the embedded profile will be attached to the image as
* #VIPS_META_ICC_NAME. You need to use something like
* vips_icc_import() to get CIE values from the file.
*
* EXIF metadata is attached as #VIPS_META_EXIF_NAME, IPTC as
* #VIPS_META_IPTC_NAME, and XMP as #VIPS_META_XMP_NAME.
*
* The int metadata item "jpeg-multiscan" is set to the result of
* jpeg_has_multiple_scans(). Interlaced jpeg images need a large amount of
* memory to load, so this field gives callers a chance to handle these
* images differently.
*
* The string-valued field "jpeg-chroma-subsample" gives the chroma subsample
* in standard notation. 4:4:4 means no subsample, 4:2:0 means YCbCr with
* Cb and Cr subsampled horizontally and vertically, 4:4:4:4 means a CMYK
* image with no subsampling.
*
* The EXIF thumbnail, if present, is attached to the image as
* "jpeg-thumbnail-data". See vips_image_get_blob().
*
* See also: vips_jpegload_buffer(), vips_image_new_from_file(), vips_autorot().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_jpegload( const char *filename, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "jpegload", ap, filename, out );
va_end( ap );
return( result );
}
/**
* vips_jpegload_buffer:
* @buf: (array length=len) (element-type guint8): memory area to load
* @len: (type gsize): size of memory area
* @out: (out): image to write
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @shrink: %gint, shrink by this much on load
* * @fail: %gboolean, fail on errors
* * @autorotate: %gboolean, use exif Orientation tag to rotate the image
* during load
*
* Read a JPEG-formatted memory block into a VIPS image. Exactly as
* vips_jpegload(), but read from a memory buffer.
*
* You must not free the buffer while @out is active. The
* #VipsObject::postclose signal on @out is a good place to free.
*
* See also: vips_jpegload().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_jpegload_buffer( void *buf, size_t len, VipsImage **out, ... )
{
va_list ap;
VipsBlob *blob;
int result;
/* We don't take a copy of the data or free it.
*/
blob = vips_blob_new( NULL, buf, len );
va_start( ap, out );
result = vips_call_split( "jpegload_buffer", ap, blob, out );
va_end( ap );
vips_area_unref( VIPS_AREA( blob ) );
return( result );
}
/**
* vips_jpegload_source:
* @source: source to load
* @out: (out): image to write
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @shrink: %gint, shrink by this much on load
* * @fail: %gboolean, fail on errors
* * @autorotate: %gboolean, use exif Orientation tag to rotate the image
* during load
*
* Read a JPEG-formatted memory block into a VIPS image. Exactly as
* vips_jpegload(), but read from a source.
*
* See also: vips_jpegload().
*
* Returns: 0 on success, -1 on error.
*/
int
vips_jpegload_source( VipsSource *source, VipsImage **out, ... )
{
va_list ap;
int result;
va_start( ap, out );
result = vips_call_split( "jpegload_source", ap, source, out );
va_end( ap );
return( result );
}