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fix up scrgb support in JXL

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after some discussion on discord with the libjxl maintainers

see https://github.com/libvips/libvips/issues/2830

to do: save scrgb to eg. JPEG fails right now :( we need to do
scRGB->sRGB in jpegsave
This commit is contained in:
John Cupitt 2022-06-12 16:43:26 +01:00
parent fe22f80f7d
commit 9f3860ec22
2 changed files with 63 additions and 39 deletions
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2
libvips/foreign/jxlload.c
View File

@ -35,8 +35,8 @@
/*
#define DEBUG_VERBOSE
*/
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>

100
libvips/foreign/jxlsave.c
View File

@ -34,8 +34,8 @@
*/
/*
#define DEBUG
*/
#define DEBUG
#ifdef HAVE_CONFIG_H
#include <config.h>
@ -227,9 +227,12 @@ vips_foreign_save_jxl_build( VipsObject *object )
{
VipsForeignSave *save = (VipsForeignSave *) object;
VipsForeignSaveJxl *jxl = (VipsForeignSaveJxl *) object;
VipsImage **t = (VipsImage **) vips_object_local_array( object, 5 );
JxlEncoderOptions *options;
JxlEncoderStatus status;
VipsImage *in;
VipsBandFormat format;
if( VIPS_OBJECT_CLASS( vips_foreign_save_jxl_parent_class )->
build( object ) )
@ -260,11 +263,28 @@ vips_foreign_save_jxl_build( VipsObject *object )
return( -1 );
}
in = save->ready;
/* Fix the input image format. JXL uses float for 0-1 linear (ie.
* scRGB) only. We must convert eg. sRGB float to 8-bit for save.
*/
if( in->Type == VIPS_INTERPRETATION_scRGB )
format = VIPS_FORMAT_FLOAT;
else if( in->Type == VIPS_INTERPRETATION_RGB16 ||
in->Type == VIPS_INTERPRETATION_GREY16 )
format = VIPS_FORMAT_USHORT;
else
format = VIPS_FORMAT_UCHAR;
if( vips_cast( in, &t[0], format, NULL ) )
return( -1 );
in = t[0];
#ifdef HAVE_LIBJXL_JXLENCODERINITBASICINFO
JxlEncoderInitBasicInfo( &jxl->info );
#endif
switch( save->ready->BandFmt ) {
switch( in->BandFmt ) {
case VIPS_FORMAT_UCHAR:
jxl->info.bits_per_sample = 8;
jxl->info.exponent_bits_per_sample = 0;
@ -288,7 +308,7 @@ vips_foreign_save_jxl_build( VipsObject *object )
break;
}
switch( save->ready->Type ) {
switch( in->Type ) {
case VIPS_INTERPRETATION_B_W:
case VIPS_INTERPRETATION_GREY16:
jxl->info.num_color_channels = 1;
@ -301,18 +321,18 @@ vips_foreign_save_jxl_build( VipsObject *object )
break;
default:
jxl->info.num_color_channels = save->ready->Bands;
jxl->info.num_color_channels = in->Bands;
}
jxl->info.num_extra_channels = VIPS_MAX( 0,
save->ready->Bands - jxl->info.num_color_channels );
in->Bands - jxl->info.num_color_channels );
jxl->info.xsize = save->ready->Xsize;
jxl->info.ysize = save->ready->Ysize;
jxl->format.num_channels = save->ready->Bands;
jxl->info.xsize = in->Xsize;
jxl->info.ysize = in->Ysize;
jxl->format.num_channels = in->Bands;
jxl->format.endianness = JXL_NATIVE_ENDIAN;
jxl->format.align = 0;
if( vips_image_hasalpha( save->ready ) ) {
if( vips_image_hasalpha( in ) ) {
jxl->info.alpha_bits = jxl->info.bits_per_sample;
jxl->info.alpha_exponent_bits =
jxl->info.exponent_bits_per_sample;
@ -322,15 +342,15 @@ vips_foreign_save_jxl_build( VipsObject *object )
jxl->info.alpha_bits = 0;
}
if( vips_image_get_typeof( save->ready, "stonits" ) ) {
if( vips_image_get_typeof( in, "stonits" ) ) {
double stonits;
if( vips_image_get_double( save->ready, "stonits", &stonits ) )
if( vips_image_get_double( in, "stonits", &stonits ) )
return( -1 );
jxl->info.intensity_target = stonits;
}
/* We will be setting the ICC profile, or calling
/* We will be setting the ICC profile, and/or calling
* JxlEncoderSetColorEncoding().
*/
jxl->info.uses_original_profile = TRUE;
@ -340,13 +360,13 @@ vips_foreign_save_jxl_build( VipsObject *object )
return( -1 );
}
/* Set ICC profile, sRGB, or scRGB.
/* Set ICC profile.
*/
if( vips_image_get_typeof( save->ready, VIPS_META_ICC_NAME ) ) {
if( vips_image_get_typeof( in, VIPS_META_ICC_NAME ) ) {
const void *data;
size_t length;
if( vips_image_get_blob( save->ready,
if( vips_image_get_blob( in,
VIPS_META_ICC_NAME, &data, &length ) )
return( -1 );
@ -360,36 +380,38 @@ vips_foreign_save_jxl_build( VipsObject *object )
return( -1 );
}
}
/* libjxl will use linear 0 - 1 by default for float, so we don't need
* to call JxlColorEncodingSetToLinearSRGB() or
* JxlColorEncodingSetToSRGB().
*/
if( in->Type == VIPS_INTERPRETATION_scRGB ) {
#ifdef DEBUG
printf( "setting scRGB colourspace\n" );
#endif /*DEBUG*/
JxlColorEncodingSetToLinearSRGB( &jxl->color_encoding,
jxl->format.num_channels < 3 );
}
else {
if( save->ready->Type == VIPS_INTERPRETATION_scRGB ) {
#ifdef DEBUG
printf( "setting sRGB colourspace\n" );
printf( "setting sRGB colourspace\n" );
#endif /*DEBUG*/
JxlColorEncodingSetToLinearSRGB( &jxl->color_encoding,
jxl->format.num_channels < 3 );
}
else {
#ifdef DEBUG
printf( "setting scRGB colourspace\n" );
#endif /*DEBUG*/
JxlColorEncodingSetToSRGB( &jxl->color_encoding,
jxl->format.num_channels < 3 );
}
JxlColorEncodingSetToSRGB( &jxl->color_encoding,
jxl->format.num_channels < 3 );
}
if( JxlEncoderSetColorEncoding( jxl->encoder,
&jxl->color_encoding ) ) {
vips_foreign_save_jxl_error( jxl,
"JxlEncoderSetColorEncoding" );
return( -1 );
}
if( JxlEncoderSetColorEncoding( jxl->encoder, &jxl->color_encoding ) ) {
vips_foreign_save_jxl_error( jxl,
"JxlEncoderSetColorEncoding" );
return( -1 );
}
/* Render the entire image in memory. libjxl seems to be missing
* tile-based write at the moment.
*/
if( vips_image_wio_input( save->ready ) )
if( vips_image_wio_input( in ) )
return( -1 );
options = JxlEncoderOptionsCreate( jxl->encoder, NULL );
@ -409,8 +431,8 @@ vips_foreign_save_jxl_build( VipsObject *object )
#endif /*DEBUG*/
if( JxlEncoderAddImageFrame( options, &jxl->format,
VIPS_IMAGE_ADDR( save->ready, 0, 0 ),
VIPS_IMAGE_SIZEOF_IMAGE( save->ready ) ) ) {
VIPS_IMAGE_ADDR( in, 0, 0 ),
VIPS_IMAGE_SIZEOF_IMAGE( in ) ) ) {
vips_foreign_save_jxl_error( jxl, "JxlEncoderAddImageFrame" );
return( -1 );
}
@ -485,7 +507,9 @@ vips_foreign_save_jxl_class_init( VipsForeignSaveJxlClass *class )
foreign_class->suffs = vips__jxl_suffs;
save_class->saveable = VIPS_SAVEABLE_ANY;
/* This lets throuigh scRGB too, which we then save as jxl float.
*/
save_class->saveable = VIPS_SAVEABLE_RGBA;
save_class->format_table = bandfmt_jxl;
VIPS_ARG_INT( class, "tier", 10,