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set xres/yres in openslideload

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we were not reading out the mpp-x/mpp-y fields

see https://github.com/libvips/libvips/issues/1691
This commit is contained in:
John Cupitt 2020-06-22 11:50:14 +01:00
parent e129dfc27a
commit 273ff003de
1 changed files with 29 additions and 3 deletions
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32
libvips/foreign/openslide2vips.c
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@ -51,6 +51,8 @@
* - reorganise to support invalidate on read error
* 27/1/18
* - option to attach associated images as metadata
* 22/6/20 adamu
* - set libvips xres/yres from openslide mpp-x/mpp-y
*/
/*
@ -361,6 +363,17 @@ readslide_attach_associated( ReadSlide *rslide, VipsImage *image )
return( 0 );
}
/* Read out a resolution field, converting to pixels per mm.
*/
static double
readslice_parse_res( ReadSlide *rslide, const char *name )
{
const char *value = openslide_get_property_value( rslide->osr, name );
double mpp = g_ascii_strtod( value, NULL );
return( mpp == 0 ? 1.0 : 1000.0 / mpp );
}
static int
readslide_parse( ReadSlide *rslide, VipsImage *image )
{
@ -369,6 +382,8 @@ readslide_parse( ReadSlide *rslide, VipsImage *image )
const char *background;
const char * const *properties;
char *associated_names;
double xres;
double yres;
rslide->osr = openslide_open( rslide->filename );
if( rslide->osr == NULL ) {
@ -493,21 +508,32 @@ readslide_parse( ReadSlide *rslide, VipsImage *image )
rslide->bounds.height = h;
}
vips_image_init_fields( image, w, h, 4, VIPS_FORMAT_UCHAR,
VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, 1.0, 1.0 );
/* Try to get resolution from openslide properties.
*/
xres = 1.0;
yres = 1.0;
for( properties = openslide_get_property_names( rslide->osr );
*properties != NULL; properties++ )
*properties != NULL; properties++ ) {
vips_image_set_string( image, *properties,
openslide_get_property_value( rslide->osr,
*properties ) );
if( strcmp( *properties, "openslide.mpp-x" ) == 0 )
xres = readslice_parse_res( rslide, *properties );
if( strcmp( *properties, "openslide.mpp-y" ) == 0 )
yres = readslice_parse_res( rslide, *properties );
}
associated_names = g_strjoinv( ", ", (char **)
openslide_get_associated_image_names( rslide->osr ) );
vips_image_set_string( image,
"slide-associated-images", associated_names );
VIPS_FREE( associated_names );
vips_image_init_fields( image, w, h, 4, VIPS_FORMAT_UCHAR,
VIPS_CODING_NONE, VIPS_INTERPRETATION_sRGB, xres, yres );
return( 0 );
}