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allow remove thumbnail from exif 

if the user has removed (or set to NULL) the "jpeg-thumbnail-data" tag,
remove it from the image EXIF on save

see https://github.com/jcupitt/ruby-vips/issues/147
This commit is contained in:
John Cupitt 2018-02-01 16:15:02 +00:00
parent 749f4a902a
commit 5a4b4e196d
2 changed files with 53 additions and 0 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
23/12/17 started 8.7.0
- add magicksave, save image with libMagick [dlemstra]
- remove jpeg thumbnail from EXIF if "jpeg-thumbnail-data" has been removed by
user
5/1/18 started 8.6.2
- vips_sink_screen() keeps a ref to the input image ... stops a rare race

51
libvips/foreign/exif.c
View File

@ -5,6 +5,8 @@
* - from jpeg2vips
* 14/10/17
* - only read orientation from ifd0
* 1/2/18
* - remove exif thumbnail if "jpeg-thumbnail-data" has been removed
*/
/*
@ -827,6 +829,48 @@ vips_exif_set_orientation( ExifData *ed, VipsImage *im )
return( 0 );
}
/* And thumbnail.
*/
static int
vips_exif_set_thumbnail( ExifData *ed, VipsImage *im )
{
/* Delete any old thumbnail data. We should use the exif free func,
* but the memory allocator is not exposed by libexif! Hopefully they
* are just using free().
*
* exif.c makes this assumption too when it tries to update a
* thumbnail.
*/
if( ed->data ) {
free( ed->data );
ed->data = NULL;
}
ed->size = 0;
/* Update EXIF thumbnail from metadata, if any.
*/
if( vips_image_get_typeof( im, "jpeg-thumbnail-data" ) ) {
void *data;
size_t length;
if( !vips_image_get_blob( im, "jpeg-thumbnail-data",
&data, &length ) )
return( -1 );
/* Again, we should use the exif allocator attached to this
* entry, but it is not exposed!
*/
if( length > 0 &&
data ) {
ed->data = malloc( length );
memcpy( ed->data, data, length );
ed->size = length;
}
}
return( 0 );
}
/* See also vips_exif_to_s() ... keep in sync.
*/
static void
@ -1079,6 +1123,13 @@ vips__exif_update( VipsImage *image )
return( -1 );
}
/* Update the thumbnail.
*/
if( vips_exif_set_thumbnail( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Reserialise and write. exif_data_save_data() returns an int for some
* reason.
*/