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libvips/libvips/file/jpegsave.c

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/* save to jpeg
*
* 28/11/03 JC
* - better no-overshoot on tile loop
* 12/11/04
* - better demand size choice for eval
* 30/6/05 JC
* - update im_error()/im_warn()
* - now loads and saves exif data
* 30/7/05
* - now loads ICC profiles
* - now saves ICC profiles from the VIPS header
* 24/8/05
* - jpeg load sets vips xres/yres from exif, if possible
* - jpeg save sets exif xres/yres from vips, if possible
* 29/8/05
* - cut from old vips_jpeg.c
* 20/4/06
* - auto convert to sRGB/mono for save
* 13/10/06
* - add </libexif/ prefix if required
* 19/1/07
* - oop, libexif confusion
* 2/11/07
* - use im_wbuffer() API for BG writes
* 15/2/08
* - write CMYK if Bands == 4 and Type == CMYK
* 12/5/09
* - fix signed/unsigned warning
* 13/8/09
* - allow "none" for profile, meaning don't embed one
* 4/2/10
* - gtkdoc
* 17/7/10
* - use g_assert()
* - allow space for the header in init_destination(), helps writing very
* small JPEGs (thanks Tim Elliott)
* 18/7/10
* - collect im_vips2bufjpeg() output in a list of blocks ... we no
* longer overallocate or underallocate
* 8/7/11
* - oop CMYK write was not inverting, thanks Ole
* 12/10/2011
* - write XMP data
* 18/10/2011
* - update Orientation as well
* 3/11/11
* - rebuild exif tags from coded metadata values
* 24/11/11
* - rework as a class
*/
/*
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG_VERBOSE
#define DEBUG
#define VIPS_DEBUG
*/
#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>
#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*/
#include <vips/vips.h>
#include <vips/internal.h>
#include <vips/debug.h>
#include <vips/buf.h>
/* jpeglib includes jconfig.h, which can define HAVE_STDLIB_H ... which we
* also define. Make sure it's turned off.
*/
#ifdef HAVE_STDLIB_H
#undef HAVE_STDLIB_H
#endif /*HAVE_STDLIB_H*/
#include <jpeglib.h>
#include <jerror.h>
#include "jpeg.h"
typedef struct _VipsFileSaveJpeg {
VipsFileSave parent_object;
/* Quality factor.
*/
int Q;
/* Profile to embed .. "none" means don't attach a profile.
*/
char *profile;
/* Stuff we track during write.
*/
struct jpeg_compress_struct cinfo;
ErrorManager eman;
JSAMPROW *row_pointer;
char *profile_bytes;
unsigned int profile_length;
/* We sometimes need to invert the image before saving.
*/
VipsImage *inverted;
} VipsFileSaveJpeg;
typedef VipsFileSaveClass VipsFileSaveJpegClass;
G_DEFINE_TYPE( VipsFileSaveJpeg, vips_file_save_jpeg, VIPS_TYPE_FILE_SAVE );
static void
vips_file_save_jpeg_dispose( GObject *gobject )
{
VipsFileSaveJpeg *save = (VipsFileSaveJpeg *) gobject;
VIPS_UNREF( save->inverted );
G_OBJECT_CLASS( vips_file_save_jpeg_parent_class )->dispose( gobject );
}
static void
vips_file_save_jpeg_finalize( GObject *gobject )
{
VipsFileSaveJpeg *save = (VipsFileSaveJpeg *) gobject;
jpeg_destroy_compress( &save->cinfo );
VIPS_FREEF( fclose, save->eman.fp );
VIPS_FREE( save->row_pointer );
VIPS_FREE( save->profile_bytes );
G_OBJECT_CLASS( vips_file_save_jpeg_parent_class )->finalize( gobject );
}
#ifdef HAVE_EXIF
static void
vips_exif_set_int( ExifData *ed,
ExifEntry *entry, unsigned long component, void *data )
{
int value = *((int *) data);
ExifByteOrder bo;
size_t sizeof_component;
size_t offset = component;
if( entry->components <= component ) {
VIPS_DEBUG_MSG( "vips_exif_set_int: too few components\n" );
return;
}
/* Wait until after the component check to make sure we cant get /0.
*/
bo = exif_data_get_byte_order( ed );
sizeof_component = entry->size / entry->components;
offset = component * sizeof_component;
VIPS_DEBUG_MSG( "vips_exif_set_int: %s = %d\n",
exif_tag_get_title( entry->tag ), value );
if( entry->format == EXIF_FORMAT_SHORT )
exif_set_short( entry->data + offset, bo, value );
else if( entry->format == EXIF_FORMAT_SSHORT )
exif_set_sshort( entry->data + offset, bo, value );
else if( entry->format == EXIF_FORMAT_LONG )
exif_set_long( entry->data + offset, bo, value );
else if( entry->format == EXIF_FORMAT_SLONG )
exif_set_slong( entry->data + offset, bo, value );
}
static void
vips_exif_set_double( ExifData *ed,
ExifEntry *entry, unsigned long component, void *data )
{
double value = *((double *) data);
ExifByteOrder bo;
size_t sizeof_component;
size_t offset;
if( entry->components <= component ) {
VIPS_DEBUG_MSG( "vips_exif_set_int: too few components\n" );
return;
}
/* Wait until after the component check to make sure we cant get /0.
*/
bo = exif_data_get_byte_order( ed );
sizeof_component = entry->size / entry->components;
offset = component * sizeof_component;
VIPS_DEBUG_MSG( "vips_exif_set_double: %s = %g\n",
exif_tag_get_title( entry->tag ), value );
if( entry->format == EXIF_FORMAT_RATIONAL ) {
ExifRational rational;
unsigned int scale;
/* We scale up to fill uint32, then set that as the
* denominator. Try to avoid generating 0.
*/
scale = (int) ((UINT_MAX - 1000) / value);
scale = scale == 0 ? 1 : scale;
rational.numerator = value * scale;
rational.denominator = scale;
exif_set_rational( entry->data + offset, bo, rational );
}
else if( entry->format == EXIF_FORMAT_SRATIONAL ) {
ExifSRational rational;
int scale;
scale = (int) ((INT_MAX - 1000) / value);
scale = scale == 0 ? 1 : scale;
rational.numerator = value * scale;
rational.denominator = scale;
exif_set_srational( entry->data + offset, bo, rational );
}
}
typedef void (*write_fn)( ExifData *ed,
ExifEntry *entry, unsigned long component, void *data );
/* Write a component in a tag everywhere it appears.
*/
static int
write_tag( ExifData *ed,
ExifTag tag, ExifFormat format, write_fn fn, void *data )
{
int found;
int i;
found = 0;
for( i = 0; i < EXIF_IFD_COUNT; i++ ) {
ExifEntry *entry;
if( (entry = exif_content_get_entry( ed->ifd[i], tag )) &&
entry->format == format ) {
fn( ed, entry, 0, data );
found = 1;
}
}
if( !found ) {
/* There was no tag we could update ... make one in ifd[0].
*/
ExifEntry *entry;
entry = exif_entry_new();
/* tag must be set before calling exif_content_add_entry.
*/
entry->tag = tag;
exif_content_add_entry( ed->ifd[0], entry );
exif_entry_initialize( entry, tag );
exif_entry_unref( entry );
fn( ed, entry, 0, data );
}
return( 0 );
}
/* This is different, we set the xres/yres from the vips header rather than
* from the exif tags on the image metadata.
*/
static int
set_exif_resolution( ExifData *ed, VipsImage *im )
{
double xres, yres;
int unit;
/* Always save as inches - more progs support it for read.
*/
xres = im->Xres * 25.4;
yres = im->Yres * 25.4;
unit = 2;
if( write_tag( ed, EXIF_TAG_X_RESOLUTION, EXIF_FORMAT_RATIONAL,
vips_exif_set_double, (void *) &xres ) ||
write_tag( ed, EXIF_TAG_Y_RESOLUTION, EXIF_FORMAT_RATIONAL,
vips_exif_set_double, (void *) &yres ) ||
write_tag( ed, EXIF_TAG_RESOLUTION_UNIT, EXIF_FORMAT_SHORT,
vips_exif_set_int, (void *) &unit ) ) {
vips_error( "VipsFileSaveJpeg",
"%s", _( "error setting JPEG resolution" ) );
return( -1 );
}
return( 0 );
}
/* See also vips_exif_to_s() ... keep in sync.
*/
static void
vips_exif_from_s( ExifData *ed, ExifEntry *entry, const char *value )
{
unsigned long i;
const char *p;
if( entry->format != EXIF_FORMAT_SHORT &&
entry->format != EXIF_FORMAT_SSHORT &&
entry->format != EXIF_FORMAT_LONG &&
entry->format != EXIF_FORMAT_SLONG &&
entry->format != EXIF_FORMAT_RATIONAL &&
entry->format != EXIF_FORMAT_SRATIONAL )
return;
if( entry->components >= 10 )
return;
/* Skip any leading spaces.
*/
p = value;
while( *p == ' ' )
p += 1;
for( i = 0; i < entry->components; i++ ) {
if( entry->format == EXIF_FORMAT_SHORT ||
entry->format == EXIF_FORMAT_SSHORT ||
entry->format == EXIF_FORMAT_LONG ||
entry->format == EXIF_FORMAT_SLONG ) {
int value = atof( p );
vips_exif_set_int( ed, entry, i, &value );
}
else if( entry->format == EXIF_FORMAT_RATIONAL ||
entry->format == EXIF_FORMAT_SRATIONAL ) {
double value = g_ascii_strtod( p, NULL );
vips_exif_set_double( ed, entry, i, &value );
}
/* Skip to the next set of spaces, then to the beginning of
* the next item.
*/
while( *p && *p != ' ' )
p += 1;
while( *p == ' ' )
p += 1;
if( !*p )
break;
}
}
typedef struct _VipsExif {
VipsImage *image;
ExifData *ed;
} VipsExif;
static void
vips_exif_update_entry( ExifEntry *entry, VipsExif *ve )
{
char name[256];
char *value;
vips_snprintf( name, 256, "exif-%s", exif_tag_get_title( entry->tag ) );
if( !vips_image_get_string( ve->image, name, &value ) )
vips_exif_from_s( ve->ed, entry, value );
}
static void
vips_exif_update_content( ExifContent *content, VipsExif *ve )
{
exif_content_foreach_entry( content,
(ExifContentForeachEntryFunc) vips_exif_update_entry, ve );
}
static void
vips_exif_update( ExifData *ed, VipsImage *image )
{
VipsExif ve;
VIPS_DEBUG_MSG( "vips_exif_update: \n" );
ve.image = image;
ve.ed = ed;
exif_data_foreach_content( ed,
(ExifDataForeachContentFunc) vips_exif_update_content, &ve );
}
#endif /*HAVE_EXIF*/
static int
write_exif( VipsFileSaveJpeg *jpeg )
{
VipsFileSave *save = (VipsFileSave *) jpeg;
unsigned char *data;
size_t data_length;
unsigned int idl;
#ifdef HAVE_EXIF
ExifData *ed;
/* Either parse from the embedded EXIF, or if there's none, make
* some fresh EXIF we can write the resolution to.
*/
if( vips_image_get_typeof( save->in, VIPS_META_EXIF_NAME ) ) {
if( vips_image_get_blob( save->in, VIPS_META_EXIF_NAME,
(void *) &data, &data_length ) )
return( -1 );
if( !(ed = exif_data_new_from_data( data, data_length )) )
return( -1 );
}
else {
ed = exif_data_new();
exif_data_set_option( ed,
EXIF_DATA_OPTION_FOLLOW_SPECIFICATION );
exif_data_set_data_type( ed, EXIF_DATA_TYPE_COMPRESSED );
exif_data_set_byte_order( ed, EXIF_BYTE_ORDER_INTEL );
/* Create the mandatory EXIF fields with default data.
*/
exif_data_fix( ed );
}
/* Update EXIF tags from the image metadata.
*/
vips_exif_update( ed, save->in );
/* Update EXIF resolution from the vips image header..
*/
if( set_exif_resolution( ed, save->in ) ) {
exif_data_free( ed );
return( -1 );
}
/* Reserialise and write. exif_data_save_data() returns an int for some
* reason.
*/
exif_data_save_data( ed, &data, &idl );
if( !idl ) {
vips_error( "VipsFileSaveJpeg",
"%s", _( "error saving EXIF" ) );
exif_data_free( ed );
return( -1 );
}
data_length = idl;
#ifdef DEBUG
printf( "jpegsave: attaching %zd bytes of EXIF\n", data_length );
#endif /*DEBUG*/
exif_data_free( ed );
jpeg_write_marker( &jpeg->cinfo, JPEG_APP0 + 1, data, data_length );
free( data );
#else /*!HAVE_EXIF*/
/* No libexif ... just copy the embedded EXIF over.
*/
if( vips_image_get_typeof( save->in, VIPS_META_EXIF_NAME ) ) {
if( vips_image_get_blob( save->in, VIPS_META_EXIF_NAME,
(void *) &data, &data_length ) )
return( -1 );
#ifdef DEBUG
printf( "jpegsave: attaching %zd bytes of EXIF\n",
data_length );
#endif /*DEBUG*/
jpeg_write_marker( &jpeg->cinfo, JPEG_APP0 + 1,
data, data_length );
}
#endif /*!HAVE_EXIF*/
return( 0 );
}
static int
write_xmp( VipsFileSaveJpeg *jpeg )
{
VipsFileSave *save = (VipsFileSave *) jpeg;
unsigned char *data;
size_t data_length;
/* No libexif ... just copy the embedded EXIF over.
*/
if( vips_image_get_typeof( save->in, VIPS_META_XMP_NAME ) ) {
if( vips_image_get_blob( save->in, VIPS_META_XMP_NAME,
(void *) &data, &data_length ) )
return( -1 );
#ifdef DEBUG
printf( "jpegsave: attaching %zd bytes of XMP\n",
data_length );
#endif /*DEBUG*/
jpeg_write_marker( &jpeg->cinfo, JPEG_APP0 + 1,
data, data_length );
}
return( 0 );
}
/* ICC writer from lcms, slight tweaks.
*/
#define ICC_MARKER (JPEG_APP0 + 2) /* JPEG marker code for ICC */
#define ICC_OVERHEAD_LEN 14 /* size of non-profile data in APP2 */
#define MAX_BYTES_IN_MARKER 65533 /* maximum data len of a JPEG marker */
#define MAX_DATA_BYTES_IN_MARKER (MAX_BYTES_IN_MARKER - ICC_OVERHEAD_LEN)
/*
* This routine writes the given ICC profile data into a JPEG file.
* It *must* be called AFTER calling jpeg_start_compress() and BEFORE
* the first call to jpeg_write_scanlines().
* (This ordering ensures that the APP2 marker(s) will appear after the
* SOI and JFIF or Adobe markers, but before all else.)
*/
static void
write_profile_data (j_compress_ptr cinfo,
const JOCTET *icc_data_ptr,
unsigned int icc_data_len)
{
unsigned int num_markers; /* total number of markers we'll write */
int cur_marker = 1; /* per spec, counting starts at 1 */
unsigned int length; /* number of bytes to write in this marker */
/* rounding up will fail for length == 0 */
g_assert( icc_data_len > 0 );
/* Calculate the number of markers we'll need, rounding up of course */
num_markers = (icc_data_len + MAX_DATA_BYTES_IN_MARKER - 1) /
MAX_DATA_BYTES_IN_MARKER;
while (icc_data_len > 0) {
/* length of profile to put in this marker */
length = icc_data_len;
if (length > MAX_DATA_BYTES_IN_MARKER)
length = MAX_DATA_BYTES_IN_MARKER;
icc_data_len -= length;
/* Write the JPEG marker header (APP2 code and marker length) */
jpeg_write_m_header(cinfo, ICC_MARKER,
(unsigned int) (length + ICC_OVERHEAD_LEN));
/* Write the marker identifying string "ICC_PROFILE" (null-terminated).
* We code it in this less-than-transparent way so that the code works
* even if the local character set is not ASCII.
*/
jpeg_write_m_byte(cinfo, 0x49);
jpeg_write_m_byte(cinfo, 0x43);
jpeg_write_m_byte(cinfo, 0x43);
jpeg_write_m_byte(cinfo, 0x5F);
jpeg_write_m_byte(cinfo, 0x50);
jpeg_write_m_byte(cinfo, 0x52);
jpeg_write_m_byte(cinfo, 0x4F);
jpeg_write_m_byte(cinfo, 0x46);
jpeg_write_m_byte(cinfo, 0x49);
jpeg_write_m_byte(cinfo, 0x4C);
jpeg_write_m_byte(cinfo, 0x45);
jpeg_write_m_byte(cinfo, 0x0);
/* Add the sequencing info */
jpeg_write_m_byte(cinfo, cur_marker);
jpeg_write_m_byte(cinfo, (int) num_markers);
/* Add the profile data */
while (length--) {
jpeg_write_m_byte(cinfo, *icc_data_ptr);
icc_data_ptr++;
}
cur_marker++;
}
}
/* Write an ICC Profile from a file into the JPEG stream.
*/
static int
write_profile_file( VipsFileSaveJpeg *jpeg, const char *profile )
{
if( !(jpeg->profile_bytes =
vips__file_read_name( profile, VIPS_ICC_DIR,
&jpeg->profile_length )) )
return( -1 );
write_profile_data( &jpeg->cinfo,
(JOCTET *) jpeg->profile_bytes, jpeg->profile_length );
#ifdef DEBUG
printf( "jpegsave: attached profile \"%s\"\n", profile );
#endif /*DEBUG*/
return( 0 );
}
static int
write_profile_meta( VipsFileSaveJpeg *jpeg )
{
VipsFileSave *save = (VipsFileSave *) jpeg;
void *data;
size_t data_length;
if( vips_image_get_blob( save->in, VIPS_META_ICC_NAME,
&data, &data_length ) )
return( -1 );
write_profile_data( &jpeg->cinfo, data, data_length );
#ifdef DEBUG
printf( "jpegsave: attached %zd byte profile from VIPS header\n",
data_length );
#endif /*DEBUG*/
return( 0 );
}
static int
write_jpeg_block( VipsRegion *region, VipsRect *area, void *a )
{
VipsFileSaveJpeg *jpeg = (VipsFileSaveJpeg *) a;
int i;
for( i = 0; i < area->height; i++ )
jpeg->row_pointer[i] = (JSAMPROW)
VIPS_REGION_ADDR( region, 0, area->top + i );
/* We are running in a background thread. We need to catch any
* longjmp()s from jpeg_write_scanlines() here.
*/
if( setjmp( jpeg->eman.jmp ) )
return( -1 );
jpeg_write_scanlines( &jpeg->cinfo, jpeg->row_pointer, area->height );
return( 0 );
}
/* Write a VIPS image to a JPEG compress struct.
*/
static int
vips_file_save_jpeg_write( VipsFileSaveJpeg *jpeg )
{
VipsFileSave *save = (VipsFileSave *) jpeg;
VipsImage *in;
J_COLOR_SPACE space;
/* The image we'll be writing ... can change, see CMYK.
*/
in = save->ready;
/* Should have been converted for save.
*/
g_assert( in->BandFmt == VIPS_FORMAT_UCHAR );
g_assert( in->Coding == VIPS_CODING_NONE );
g_assert( in->Bands == 1 || in->Bands == 3 || in->Bands == 4 );
/* Check input image.
*/
if( vips_image_pio_input( in ) )
return( -1 );
/* Set compression parameters.
*/
jpeg->cinfo.image_width = in->Xsize;
jpeg->cinfo.image_height = in->Ysize;
jpeg->cinfo.input_components = in->Bands;
if( in->Bands == 4 &&
in->Type == VIPS_INTERPRETATION_CMYK ) {
space = JCS_CMYK;
/* IJG always sets an Adobe marker, so we should invert CMYK.
*/
if( vips_invert( in, &jpeg->inverted, NULL ) )
return( -1 );
in = jpeg->inverted;
}
else if( in->Bands == 3 )
space = JCS_RGB;
else if( in->Bands == 1 )
space = JCS_GRAYSCALE;
else
/* Use luminance compression for all channels.
*/
space = JCS_UNKNOWN;
jpeg->cinfo.in_color_space = space;
/* Build VIPS output stuff now we know the image we'll be writing.
*/
if( !(jpeg->row_pointer = VIPS_ARRAY( NULL, in->Ysize, JSAMPROW )) )
return( -1 );
/* Rest to default.
*/
jpeg_set_defaults( &jpeg->cinfo );
jpeg_set_quality( &jpeg->cinfo, jpeg->Q, TRUE );
/* Build compress tables.
*/
jpeg_start_compress( &jpeg->cinfo, TRUE );
/* Write any APP markers we need.
*/
if( write_exif( jpeg ) )
return( -1 );
if( write_xmp( jpeg ) )
return( -1 );
/* A profile supplied as an argument overrides an embedded profile.
* "none" means don't attach a profile.
*/
if( jpeg->profile &&
strcmp( jpeg->profile, "none" ) != 0 &&
write_profile_file( jpeg, jpeg->profile ) )
return( -1 );
if( !jpeg->profile &&
vips_image_get_typeof( in, VIPS_META_ICC_NAME ) &&
write_profile_meta( jpeg ) )
return( -1 );
/* Write data. Note that the write function grabs the longjmp()!
*/
if( vips_sink_disc( in, write_jpeg_block, jpeg ) )
return( -1 );
/* We have to reinstate the setjmp() before we jpeg_finish_compress().
*/
if( setjmp( jpeg->eman.jmp ) )
return( -1 );
jpeg_finish_compress( &jpeg->cinfo );
return( 0 );
}
static int
vips_file_save_jpeg_build( VipsObject *object )
{
VipsFile *file = (VipsFile *) object;
VipsFileSaveJpeg *jpeg = (VipsFileSaveJpeg *) object;
if( VIPS_OBJECT_CLASS( vips_file_save_jpeg_parent_class )->
build( object ) )
return( -1 );
if( setjmp( jpeg->eman.jmp ) )
/* Here for longjmp() from vips__new_error_exit().
*/
return( -1 );
/* Can't do this in init, has to be after we've made the
* setjmp().
*/
jpeg_create_compress( &jpeg->cinfo );
/* Make output.
*/
if( !(jpeg->eman.fp = vips__file_open_write( file->filename, FALSE )) )
return( -1 );
jpeg_stdio_dest( &jpeg->cinfo, jpeg->eman.fp );
/* Convert!
*/
if( vips_file_save_jpeg_write( jpeg ) )
return( -1 );
return( 0 );
}
#define UC VIPS_FORMAT_UCHAR
/* Type promotion for save ... just always go to uchar.
*/
static int bandfmt_jpeg[10] = {
/* UC C US S UI I F X D DX */
UC, UC, UC, UC, UC, UC, UC, UC, UC, UC
};
static void
vips_file_save_jpeg_class_init( VipsFileSaveJpegClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsFileSaveClass *save_class = (VipsFileSaveClass *) class;
gobject_class->dispose = vips_file_save_jpeg_dispose;
gobject_class->finalize = vips_file_save_jpeg_finalize;
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
object_class->nickname = "jpegsave";
object_class->description = _( "save jpeg to file" );
object_class->build = vips_file_save_jpeg_build;
save_class->saveable = VIPS_SAVEABLE_RGB_CMYK;
save_class->format_table = bandfmt_jpeg;
VIPS_ARG_INT( class, "Q", 10,
_( "Q" ),
_( "Q factor" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsFileSaveJpeg, Q ),
1, 100, 75 );
VIPS_ARG_STRING( class, "profile", 11,
_( "profile" ),
_( "ICC profile to embed" ),
VIPS_ARGUMENT_OPTIONAL_INPUT,
G_STRUCT_OFFSET( VipsFileSaveJpeg, profile ),
NULL );
}
static void
vips_file_save_jpeg_init( VipsFileSaveJpeg *jpeg )
{
jpeg->Q = 75;
jpeg->cinfo.err = jpeg_std_error( &jpeg->eman.pub );
jpeg->eman.pub.error_exit = vips__new_error_exit;
jpeg->eman.pub.output_message = vips__new_output_message;
}
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