libvips/libvips/foreign/jxlload.c

/* load jpeg-xl
 *
 * 18/3/20
 * 	- from heifload.c
 * 1/10/21
 * 	- reset read point for _load
 */

/*

    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

 */

/*
#define DEBUG_VERBOSE
#define DEBUG
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <vips/vips.h>
#include <vips/debug.h>
#include <vips/internal.h>

#ifdef HAVE_LIBJXL

#include <jxl/decode.h>
#include <jxl/thread_parallel_runner.h>

#include "pforeign.h"

/* TODO:
 *
 * - add metadata support
 *
 * - add animation support
 *
 * - add "shrink" option to read out 8x shrunk image?
 *
 * - fix scRGB gamma 
 */

#define INPUT_BUFFER_SIZE (4096)

typedef struct _VipsForeignLoadJxl {
	VipsForeignLoad parent_object;

	/* Source to load from (set by subclasses).
	 */
	VipsSource *source;

	/* Page set by user, then we translate that into shrink factor.
	 */
	int page;
	int shrink;

	/* Base image properties.
	 */
	JxlBasicInfo info;
	JxlPixelFormat format;
	size_t icc_size;
	uint8_t *icc_data;

	/* Decompress state.
	 */
	void *runner;
	JxlDecoder *decoder;

	/* Our input buffer.
	 */
	uint8_t input_buffer[INPUT_BUFFER_SIZE];
	size_t bytes_in_buffer;

	/* Number of errors reported during load -- use this to block load of
	 * corrupted images.
	 */
	int n_errors;

	/* If we need to upsample tiles read from opj.
	 */
	gboolean upsample;

	/* If we need to do ycc->rgb conversion on load.
	 */
	gboolean ycc_to_rgb;
} VipsForeignLoadJxl;

typedef VipsForeignLoadClass VipsForeignLoadJxlClass;

G_DEFINE_ABSTRACT_TYPE( VipsForeignLoadJxl, vips_foreign_load_jxl, 
	VIPS_TYPE_FOREIGN_LOAD );

static void
vips_foreign_load_jxl_dispose( GObject *gobject )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) gobject;

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_dispose:\n" );
#endif /*DEBUG*/

	VIPS_FREEF( JxlThreadParallelRunnerDestroy, jxl->runner );
	VIPS_FREEF( JxlDecoderDestroy, jxl->decoder );
	VIPS_FREE( jxl->icc_data );

	G_OBJECT_CLASS( vips_foreign_load_jxl_parent_class )->
		dispose( gobject );
}

static void
vips_foreign_load_jxl_error( VipsForeignLoadJxl *jxl, const char *details )
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( jxl );

	/* TODO ... jxl has no way to get error messages at the moment.
	 */
	vips_error( class->nickname, "error %s", details );
}

static int
vips_foreign_load_jxl_build( VipsObject *object )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) object;

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_build:\n" );
#endif /*DEBUG*/

	jxl->runner = JxlThreadParallelRunnerCreate( NULL, 
		vips_concurrency_get() );
	jxl->decoder = JxlDecoderCreate( NULL );

	if( JxlDecoderSubscribeEvents( jxl->decoder, 
		JXL_DEC_COLOR_ENCODING |
		JXL_DEC_BASIC_INFO |
		JXL_DEC_FULL_IMAGE ) ) {
		vips_foreign_load_jxl_error( jxl, "JxlDecoderSubscribeEvents" );
		return( -1 );
	}
	if( JxlDecoderSetParallelRunner( jxl->decoder, 
		JxlThreadParallelRunner, jxl->runner ) ) {
		vips_foreign_load_jxl_error( jxl, 
			"JxlDecoderSetParallelRunner" );
		return( -1 );
	}

	if( VIPS_OBJECT_CLASS( vips_foreign_load_jxl_parent_class )->
		build( object ) )
		return( -1 );

	return( 0 );
}

static gboolean
vips_foreign_load_jxl_is_a_source( VipsSource *source )
{
	const unsigned char *p;
	JxlSignature sig;

	return( (p = vips_source_sniff( source, 12 )) &&
		(sig = JxlSignatureCheck( p, 12 )) != JXL_SIG_INVALID &&
		sig != JXL_SIG_NOT_ENOUGH_BYTES );
}

static VipsForeignFlags
vips_foreign_load_jxl_get_flags( VipsForeignLoad *load )
{
	return( VIPS_FOREIGN_PARTIAL );
}

static int
vips_foreign_load_jxl_fill_input( VipsForeignLoadJxl *jxl, 
	size_t bytes_remaining )
{
	gint64 bytes_read;

#ifdef DEBUG_VERBOSE
	printf( "vips_foreign_load_jxl_fill_input: %zd bytes requested\n", 
		INPUT_BUFFER_SIZE - bytes_remaining );
#endif /*DEBUG_VERBOSE*/

	memmove( jxl->input_buffer,
		jxl->input_buffer + jxl->bytes_in_buffer - bytes_remaining,
		bytes_remaining );
	bytes_read = vips_source_read( jxl->source,
		jxl->input_buffer + bytes_remaining,
		INPUT_BUFFER_SIZE - bytes_remaining );
	/* Read error, or unexpected end of input.
	 */
	if( bytes_read <= 0 ) 
		return( -1 );
	jxl->bytes_in_buffer = bytes_read + bytes_remaining;

#ifdef DEBUG_VERBOSE
	printf( "vips_foreign_load_jxl_fill_input: %zd bytes read\n", 
		bytes_read );
#endif /*DEBUG_VERBOSE*/

	return( 0 );
}

#ifdef DEBUG
static void
vips_foreign_load_jxl_print_status( JxlDecoderStatus status )
{
	switch( status ) {
	case JXL_DEC_SUCCESS:
		printf( "JXL_DEC_SUCCESS\n" );
		break;

	case JXL_DEC_ERROR:
		printf( "JXL_DEC_ERROR\n" );
		break;

	case JXL_DEC_NEED_MORE_INPUT:
		printf( "JXL_DEC_NEED_MORE_INPUT\n" );
		break;

	case JXL_DEC_NEED_PREVIEW_OUT_BUFFER:
		printf( "JXL_DEC_NEED_PREVIEW_OUT_BUFFER\n" );
		break;

	case JXL_DEC_NEED_DC_OUT_BUFFER:
		printf( "JXL_DEC_NEED_DC_OUT_BUFFER\n" );
		break;

	case JXL_DEC_NEED_IMAGE_OUT_BUFFER:
		printf( "JXL_DEC_NEED_IMAGE_OUT_BUFFER\n" );
		break;

	case JXL_DEC_JPEG_NEED_MORE_OUTPUT:
		printf( "JXL_DEC_JPEG_NEED_MORE_OUTPUT\n" );
		break;

	case JXL_DEC_BASIC_INFO:
		printf( "JXL_DEC_BASIC_INFO\n" );
		break;

	case JXL_DEC_EXTENSIONS:
		printf( "JXL_DEC_EXTENSIONS\n" );
		break;

	case JXL_DEC_COLOR_ENCODING:
		printf( "JXL_DEC_COLOR_ENCODING\n" );
		break;

	case JXL_DEC_PREVIEW_IMAGE:
		printf( "JXL_DEC_PREVIEW_IMAGE\n" );
		break;

	case JXL_DEC_FRAME:
		printf( "JXL_DEC_FRAME\n" );
		break;

	case JXL_DEC_DC_IMAGE:
		printf( "JXL_DEC_DC_IMAGE\n" );
		break;

	case JXL_DEC_FULL_IMAGE:
		printf( "JXL_DEC_FULL_IMAGE\n" );
		break;

	case JXL_DEC_JPEG_RECONSTRUCTION:
		printf( "JXL_DEC_JPEG_RECONSTRUCTION\n" );
		break;

	default:
		printf( "JXL_DEC_<unknown>\n" );
		break;
	}
}

static void
vips_foreign_load_jxl_print_info( JxlBasicInfo *info )
{
	printf( "JxlBasicInfo:\n" );
	printf( "    have_container = %d\n", info->have_container );
	printf( "    xsize = %d\n", info->xsize );
	printf( "    ysize = %d\n", info->ysize );
	printf( "    bits_per_sample = %d\n", info->bits_per_sample );
	printf( "    exponent_bits_per_sample = %d\n", 
		info->exponent_bits_per_sample );
	printf( "    intensity_target = %g\n", info->intensity_target );
	printf( "    min_nits = %g\n", info->min_nits );
	printf( "    relative_to_max_display = %d\n", 
		info->relative_to_max_display );
	printf( "    linear_below = %g\n", info->linear_below );
	printf( "    uses_original_profile = %d\n", 
		info->uses_original_profile );
	printf( "    have_preview = %d\n", info->have_preview );
	printf( "    have_animation = %d\n", info->have_animation );
	printf( "    orientation = %d\n", info->orientation );
	printf( "    num_color_channels = %d\n", info->num_color_channels );
	printf( "    num_extra_channels = %d\n", info->num_extra_channels );
	printf( "    alpha_bits = %d\n", info->alpha_bits );
	printf( "    alpha_exponent_bits = %d\n", info->alpha_exponent_bits );
	printf( "    alpha_premultiplied = %d\n", info->alpha_premultiplied );
	printf( "    preview.xsize = %d\n", info->preview.xsize );
	printf( "    preview.ysize = %d\n", info->preview.ysize );
	printf( "    animation.tps_numerator = %d\n", 
		info->animation.tps_numerator );
	printf( "    animation.tps_denominator = %d\n", 
		info->animation.tps_denominator );
	printf( "    animation.num_loops = %d\n", info->animation.num_loops );
	printf( "    animation.have_timecodes = %d\n", 
		info->animation.have_timecodes );
}

static void
vips_foreign_load_jxl_print_format( JxlPixelFormat *format )
{
	printf( "JxlPixelFormat:\n" );
	printf( "    data_type = " );
	switch( format->data_type ) {
	case JXL_TYPE_UINT8: 
		printf( "JXL_TYPE_UINT8" );
		break;

	case JXL_TYPE_UINT16: 
		printf( "JXL_TYPE_UINT16" );
		break;

	case JXL_TYPE_UINT32: 
		printf( "JXL_TYPE_UINT32" );
		break;

	case JXL_TYPE_FLOAT: 
		printf( "JXL_TYPE_FLOAT" );
		break;

	default:
		printf( "(unknown)" );
		break;
	}
	printf( "\n" );
	printf( "    num_channels = %d\n", format->num_channels );
	printf( "    endianness = %d\n", format->endianness );
	printf( "    align = %zd\n", format->align );
}
#endif /*DEBUG*/

static JxlDecoderStatus 
vips_foreign_load_jxl_process( VipsForeignLoadJxl *jxl )
{
	JxlDecoderStatus status;

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_process: starting ...\n" );
#endif /*DEBUG*/

	while( (status = JxlDecoderProcessInput( jxl->decoder )) == 
		JXL_DEC_NEED_MORE_INPUT ) {
		size_t bytes_remaining;

		bytes_remaining = JxlDecoderReleaseInput( jxl->decoder );
		if( vips_foreign_load_jxl_fill_input( jxl, bytes_remaining ) )
			return( JXL_DEC_ERROR );

		JxlDecoderSetInput( jxl->decoder,
			jxl->input_buffer, jxl->bytes_in_buffer );
	}

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_process: seen " );
	vips_foreign_load_jxl_print_status( status );
#endif /*DEBUG*/

	return( status );
}

static int
vips_foreign_load_jxl_set_header( VipsForeignLoadJxl *jxl, VipsImage *out )
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( jxl );

	VipsBandFormat format;
	VipsInterpretation interpretation;

	if( jxl->info.xsize >= VIPS_MAX_COORD || 
		jxl->info.ysize >= VIPS_MAX_COORD ) {
		vips_error( class->nickname, 
			"%s", _( "image size out of bounds" ) );
		return( -1 );
	}

	switch( jxl->format.data_type ) {
	case JXL_TYPE_UINT8:
		format = VIPS_FORMAT_UCHAR;
		break;

	case JXL_TYPE_UINT16:
		format = VIPS_FORMAT_USHORT;
		break;

	case JXL_TYPE_UINT32:
		format = VIPS_FORMAT_UINT;
		break;

	case JXL_TYPE_FLOAT:
		format = VIPS_FORMAT_FLOAT;
		break;

	default:
		g_assert_not_reached();
	}

	switch( jxl->info.num_color_channels ) {
	case 1:
		switch( format ) {
		case VIPS_FORMAT_UCHAR:
			interpretation = VIPS_INTERPRETATION_B_W;
			break;

		case VIPS_FORMAT_USHORT:
		case VIPS_FORMAT_UINT:
			interpretation = VIPS_INTERPRETATION_GREY16;
			break;

		default:
			interpretation = VIPS_INTERPRETATION_B_W;
			break;
		}
		break;

	case 3:
		switch( format ) {
		case VIPS_FORMAT_UCHAR:
			interpretation = VIPS_INTERPRETATION_sRGB;
			break;

		case VIPS_FORMAT_USHORT:
		case VIPS_FORMAT_UINT:
			interpretation = VIPS_INTERPRETATION_RGB16;
			break;

		case VIPS_FORMAT_FLOAT:
			interpretation = VIPS_INTERPRETATION_scRGB;
			break;

		default:
			interpretation = VIPS_INTERPRETATION_sRGB;
			break;
		}
		break;

	default:
		interpretation = VIPS_INTERPRETATION_MULTIBAND;
		break;
	}

	vips_image_init_fields( out,
		jxl->info.xsize, jxl->info.ysize, jxl->format.num_channels, 
		format, VIPS_CODING_NONE, interpretation, 1.0, 1.0 );

	/* Even though this is a full image reader, we hint thinstrip since 
	 * we are quite happy serving that if anything downstream 
	 * would like it.
	 */
        if( vips_image_pipelinev( out, VIPS_DEMAND_STYLE_THINSTRIP, NULL ) )
		return( -1 );

	if( jxl->icc_data &&
		jxl->icc_size > 0 ) {
		vips_image_set_blob( out, VIPS_META_ICC_NAME, 
			(VipsCallbackFn) vips_area_free_cb, 
			jxl->icc_data, jxl->icc_size );
		jxl->icc_data = NULL;
		jxl->icc_size = 0;
	}

	vips_image_set_int( out, 
		VIPS_META_ORIENTATION, jxl->info.orientation );

	return( 0 );
}

static int
vips_foreign_load_jxl_header( VipsForeignLoad *load )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) load;

	JxlDecoderStatus status;

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_header:\n" );
#endif /*DEBUG*/

	if( vips_source_rewind( jxl->source ) )
                return( -1 );

	if( vips_foreign_load_jxl_fill_input( jxl, 0 ) )
		return( -1 );
	JxlDecoderSetInput( jxl->decoder, 
		jxl->input_buffer, jxl->bytes_in_buffer );

	/* Read to the end of the header.
	 */
	do {
		switch( (status = vips_foreign_load_jxl_process( jxl )) ) {
		case JXL_DEC_ERROR:   
			vips_foreign_load_jxl_error( jxl, 
				"JxlDecoderProcessInput" );
			return( -1 );

		case JXL_DEC_BASIC_INFO:   
			if( JxlDecoderGetBasicInfo( jxl->decoder, 
				&jxl->info ) ) {
				vips_foreign_load_jxl_error( jxl, 
					"JxlDecoderGetBasicInfo" );
				return( -1 );
			}
#ifdef DEBUG
			vips_foreign_load_jxl_print_info( &jxl->info );
#endif /*DEBUG*/

			/* Pick a pixel format to decode to.
			 */
			jxl->format.num_channels = 
				jxl->info.num_color_channels + 
				jxl->info.num_extra_channels;
			if( jxl->info.exponent_bits_per_sample > 0 ||
				jxl->info.alpha_exponent_bits > 0 )
				jxl->format.data_type = JXL_TYPE_FLOAT;
			else if( jxl->info.bits_per_sample > 16 )
				jxl->format.data_type = JXL_TYPE_UINT32;
			else if( jxl->info.bits_per_sample > 8 )
				jxl->format.data_type = JXL_TYPE_UINT16;
			else
				jxl->format.data_type = JXL_TYPE_UINT8;
			jxl->format.endianness = JXL_NATIVE_ENDIAN;
			jxl->format.align = 0;

#ifdef DEBUG
			vips_foreign_load_jxl_print_format( &jxl->format );
#endif /*DEBUG*/

			break;

		case JXL_DEC_COLOR_ENCODING:
			if( JxlDecoderGetICCProfileSize( jxl->decoder,
				&jxl->format, 
				JXL_COLOR_PROFILE_TARGET_DATA, 
				&jxl->icc_size ) ) {
				vips_foreign_load_jxl_error( jxl, 
					"JxlDecoderGetICCProfileSize" );
				return( -1 );
			}

#ifdef DEBUG
			printf( "vips_foreign_load_jxl_header: "
				"%zd byte profile\n", jxl->icc_size );
#endif /*DEBUG*/
			if( !(jxl->icc_data = vips_malloc( NULL, 
				jxl->icc_size )) ) 
				return( -1 );

			if( JxlDecoderGetColorAsICCProfile( jxl->decoder, 
				&jxl->format, 
				JXL_COLOR_PROFILE_TARGET_DATA,
				jxl->icc_data, jxl->icc_size ) ) {
				vips_foreign_load_jxl_error( jxl, 
					"JxlDecoderGetColorAsICCProfile" );
				return( -1 );
			}
			break;

		default:
			break;
		}
	/* JXL_DEC_COLOR_ENCODING is always the last status signal before
	 * pixel decoding starts.
	 */
	} while( status != JXL_DEC_COLOR_ENCODING );

	if( vips_foreign_load_jxl_set_header( jxl, load->out ) ) 
		return( -1 );

	VIPS_SETSTR( load->out->filename, 
		vips_connection_filename( VIPS_CONNECTION( jxl->source ) ) );

	return( 0 );
}

static int
vips_foreign_load_jxl_load( VipsForeignLoad *load )
{
	VipsObjectClass *class = VIPS_OBJECT_GET_CLASS( load );
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) load;
	VipsImage **t = (VipsImage **) 
		vips_object_local_array( VIPS_OBJECT( load ), 3 );

	size_t buffer_size;
	JxlDecoderStatus status;

#ifdef DEBUG
	printf( "vips_foreign_load_jxl_load:\n" );
#endif /*DEBUG*/

	t[0] = vips_image_new();
	if( vips_foreign_load_jxl_set_header( jxl, t[0] ) ) 
		return( -1 );

	/* We have to reset the reader ... we can't reply onb the read point
	 * being left just after the header.
	 */
	if( vips_source_rewind( jxl->source ) )
                return( -1 );

	if( vips_foreign_load_jxl_fill_input( jxl, 0 ) )
		return( -1 );
	JxlDecoderSetInput( jxl->decoder, 
		jxl->input_buffer, jxl->bytes_in_buffer );

	/* Read to the end of the image.
	 */
	do {
		switch( (status = vips_foreign_load_jxl_process( jxl )) ) {
		case JXL_DEC_ERROR:   
			vips_foreign_load_jxl_error( jxl, 
				"JxlDecoderProcessInput" );
			return( -1 );

		case JXL_DEC_NEED_IMAGE_OUT_BUFFER:   
			if( vips_image_write_prepare( t[0] ) )
				return( -1 );

			if( JxlDecoderImageOutBufferSize( jxl->decoder, 
				&jxl->format, 
				&buffer_size ) ) {
				vips_foreign_load_jxl_error( jxl, 
					"JxlDecoderImageOutBufferSize" );
				return( -1 );
			}
			if( buffer_size != 
				VIPS_IMAGE_SIZEOF_IMAGE( t[0] ) ) {
				vips_error( class->nickname, 
					"%s", _( "bad buffer size" ) );
				return( -1 );
			}
			if( JxlDecoderSetImageOutBuffer( jxl->decoder,
				&jxl->format, 
				VIPS_IMAGE_ADDR( t[0], 0, 0 ),
				VIPS_IMAGE_SIZEOF_IMAGE( t[0] ) ) ) {
				vips_foreign_load_jxl_error( jxl, 
					"JxlDecoderSetImageOutBuffer" );
				return( -1 );
			}
			break;

		case JXL_DEC_FULL_IMAGE:
			/* Image decoded.
			 */
			break;

		default:
			break;
		}
	} while( status != JXL_DEC_SUCCESS );

	if( vips_image_write( t[0], load->real ) ) 
		return( -1 );

	return( 0 );
}

static void
vips_foreign_load_jxl_class_init( VipsForeignLoadJxlClass *class )
{
	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;

	gobject_class->dispose = vips_foreign_load_jxl_dispose;
	gobject_class->set_property = vips_object_set_property;
	gobject_class->get_property = vips_object_get_property;

	object_class->nickname = "jxlload_base";
	object_class->description = _( "load JPEG-XL image" );
	object_class->build = vips_foreign_load_jxl_build;

	/* libjxl is fuzzed, but it's relatively young and bugs are
	 * still being found in jan 2022. Revise this status soon.
	 */
	operation_class->flags |= VIPS_OPERATION_UNTRUSTED;

	load_class->get_flags = vips_foreign_load_jxl_get_flags;
	load_class->header = vips_foreign_load_jxl_header;
	load_class->load = vips_foreign_load_jxl_load;

}

static void
vips_foreign_load_jxl_init( VipsForeignLoadJxl *jxl )
{
}

typedef struct _VipsForeignLoadJxlFile {
	VipsForeignLoadJxl parent_object;

	/* Filename for load.
	 */
	char *filename; 

} VipsForeignLoadJxlFile;

typedef VipsForeignLoadJxlClass VipsForeignLoadJxlFileClass;

G_DEFINE_TYPE( VipsForeignLoadJxlFile, vips_foreign_load_jxl_file, 
	vips_foreign_load_jxl_get_type() );

static int
vips_foreign_load_jxl_file_build( VipsObject *object )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) object;
	VipsForeignLoadJxlFile *file = (VipsForeignLoadJxlFile *) object;

	if( file->filename &&
		!(jxl->source = vips_source_new_from_file( file->filename )) )
		return( -1 );

	if( VIPS_OBJECT_CLASS( vips_foreign_load_jxl_file_parent_class )->
		build( object ) )
		return( -1 );

	return( 0 );
}

const char *vips__jxl_suffs[] = 
	{ ".jxl", NULL };

static int
vips_foreign_load_jxl_is_a( const char *filename )
{
	VipsSource *source;
	gboolean result;

	if( !(source = vips_source_new_from_file( filename )) )
		return( FALSE );
	result = vips_foreign_load_jxl_is_a_source( source );
	VIPS_UNREF( source );

	return( result );
}

static void
vips_foreign_load_jxl_file_class_init( VipsForeignLoadJxlFileClass *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 = "jxlload";
	object_class->build = vips_foreign_load_jxl_file_build;

	foreign_class->suffs = vips__jxl_suffs;

	load_class->is_a = vips_foreign_load_jxl_is_a;

	VIPS_ARG_STRING( class, "filename", 1, 
		_( "Filename" ),
		_( "Filename to load from" ),
		VIPS_ARGUMENT_REQUIRED_INPUT, 
		G_STRUCT_OFFSET( VipsForeignLoadJxlFile, filename ),
		NULL );

}

static void
vips_foreign_load_jxl_file_init( VipsForeignLoadJxlFile *jxl )
{
}

typedef struct _VipsForeignLoadJxlBuffer {
	VipsForeignLoadJxl parent_object;

	/* Load from a buffer.
	 */
	VipsArea *buf;

} VipsForeignLoadJxlBuffer;

typedef VipsForeignLoadJxlClass VipsForeignLoadJxlBufferClass;

G_DEFINE_TYPE( VipsForeignLoadJxlBuffer, vips_foreign_load_jxl_buffer, 
	vips_foreign_load_jxl_get_type() );

static int
vips_foreign_load_jxl_buffer_build( VipsObject *object )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) object;
	VipsForeignLoadJxlBuffer *buffer = 
		(VipsForeignLoadJxlBuffer *) object;

	if( buffer->buf )
		if( !(jxl->source = vips_source_new_from_memory( 
			VIPS_AREA( buffer->buf )->data, 
			VIPS_AREA( buffer->buf )->length )) )
			return( -1 );

	if( VIPS_OBJECT_CLASS( vips_foreign_load_jxl_file_parent_class )->
		build( object ) )
		return( -1 );

	return( 0 );
}

static gboolean
vips_foreign_load_jxl_buffer_is_a( 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_jxl_is_a_source( source );
	VIPS_UNREF( source );

	return( result );
}

static void
vips_foreign_load_jxl_buffer_class_init( VipsForeignLoadJxlBufferClass *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 = "jxlload_buffer";
	object_class->build = vips_foreign_load_jxl_buffer_build;

	load_class->is_a_buffer = vips_foreign_load_jxl_buffer_is_a;

	VIPS_ARG_BOXED( class, "buffer", 1, 
		_( "Buffer" ),
		_( "Buffer to load from" ),
		VIPS_ARGUMENT_REQUIRED_INPUT, 
		G_STRUCT_OFFSET( VipsForeignLoadJxlBuffer, buf ),
		VIPS_TYPE_BLOB );

}

static void
vips_foreign_load_jxl_buffer_init( VipsForeignLoadJxlBuffer *buffer )
{
}

typedef struct _VipsForeignLoadJxlSource {
	VipsForeignLoadJxl parent_object;

	/* Load from a source.
	 */
	VipsSource *source;

} VipsForeignLoadJxlSource;

typedef VipsForeignLoadJxlClass VipsForeignLoadJxlSourceClass;

G_DEFINE_TYPE( VipsForeignLoadJxlSource, vips_foreign_load_jxl_source, 
	vips_foreign_load_jxl_get_type() );

static int
vips_foreign_load_jxl_source_build( VipsObject *object )
{
	VipsForeignLoadJxl *jxl = (VipsForeignLoadJxl *) object;
	VipsForeignLoadJxlSource *source = 
		(VipsForeignLoadJxlSource *) object;

	if( source->source ) {
		jxl->source = source->source;
		g_object_ref( jxl->source );
	}

	if( VIPS_OBJECT_CLASS( 
		vips_foreign_load_jxl_source_parent_class )->
			build( object ) )
		return( -1 );

	return( 0 );
}

static void
vips_foreign_load_jxl_source_class_init( VipsForeignLoadJxlSourceClass *class )
{
	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
	VipsObjectClass *object_class = (VipsObjectClass *) class;
	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( 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 = "jxlload_source";
	object_class->build = vips_foreign_load_jxl_source_build;

	operation_class->flags = VIPS_OPERATION_NOCACHE;

	load_class->is_a_source = vips_foreign_load_jxl_is_a_source;

	VIPS_ARG_OBJECT( class, "source", 1,
		_( "Source" ),
		_( "Source to load from" ),
		VIPS_ARGUMENT_REQUIRED_INPUT, 
		G_STRUCT_OFFSET( VipsForeignLoadJxlSource, source ),
		VIPS_TYPE_SOURCE );

}

static void
vips_foreign_load_jxl_source_init( VipsForeignLoadJxlSource *jxl )
{
}

#endif /*HAVE_LIBJXL*/

/* The C API wrappers are defined in foreign.c.
 */