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read tiff metadata more carefully 

we were not always fetching the root metadata
This commit is contained in:
John Cupitt 2020-06-04 05:07:34 +01:00
parent 6e1fd6136d
commit c82be3d30e
1 changed files with 21 additions and 15 deletions
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36
libvips/foreign/tiff2vips.c
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@ -309,6 +309,10 @@ typedef struct _RtiffHeader {
*/
int subifd_count;
/* Optional IMAGEDESCRIPTION.
*/
char *image_description;
} RtiffHeader;
/* Scanline-type process function.
@ -1581,18 +1585,16 @@ rtiff_set_header( Rtiff *rtiff, VipsImage *out )
/* Read any ICC profile.
*/
if( TIFFGetField( rtiff->tiff,
TIFFTAG_ICCPROFILE, &data_length, &data ) ) {
TIFFTAG_ICCPROFILE, &data_length, &data ) )
vips_image_set_blob_copy( out,
VIPS_META_ICC_NAME, data, data_length );
}
/* Read any XMP metadata.
*/
if( TIFFGetField( rtiff->tiff,
TIFFTAG_XMLPACKET, &data_length, &data ) ) {
TIFFTAG_XMLPACKET, &data_length, &data ) )
vips_image_set_blob_copy( out,
VIPS_META_XMP_NAME, data, data_length );
}
/* Read any IPTC metadata.
*/
@ -1610,20 +1612,13 @@ rtiff_set_header( Rtiff *rtiff, VipsImage *out )
/* Read any photoshop metadata.
*/
if( TIFFGetField( rtiff->tiff,
TIFFTAG_PHOTOSHOP, &data_length, &data ) ) {
TIFFTAG_PHOTOSHOP, &data_length, &data ) )
vips_image_set_blob_copy( out,
VIPS_META_PHOTOSHOP_NAME, data, data_length );
}
/* IMAGEDESCRIPTION often has useful metadata.
*/
if( TIFFGetField( rtiff->tiff, TIFFTAG_IMAGEDESCRIPTION, &data ) ) {
/* libtiff makes sure that data is null-terminated and contains
* no embedded null characters.
*/
vips_image_set_string( out,
VIPS_META_IMAGEDESCRIPTION, (char *) data );
}
if( rtiff->header.image_description )
vips_image_set_string( out, VIPS_META_IMAGEDESCRIPTION,
rtiff->header.image_description );
if( get_resolution( rtiff->tiff, out ) )
return( -1 );
@ -2322,6 +2317,7 @@ rtiff_header_read( Rtiff *rtiff, RtiffHeader *header )
uint16 extra_samples_count;
uint16 *extra_samples_types;
toff_t *subifd_offsets;
char *image_description;
if( !tfget32( rtiff->tiff, TIFFTAG_IMAGEWIDTH,
&header->width ) ||
@ -2424,6 +2420,16 @@ rtiff_header_read( Rtiff *rtiff, RtiffHeader *header )
TIFFGetField( rtiff->tiff, TIFFTAG_SUBIFD,
&header->subifd_count, &subifd_offsets );
/* IMAGEDESCRIPTION often has useful metadata. libtiff makes sure
* that data is null-terminated and contains no embedded null
* characters.
*/
if( TIFFGetField( rtiff->tiff,
TIFFTAG_IMAGEDESCRIPTION, &image_description ) )
header->image_description =
vips_strdup( VIPS_OBJECT( rtiff->out ),
image_description );
/* Tiles and strip images have slightly different fields.
*/
header->tiled = TIFFIsTiled( rtiff->tiff );