/* Update tags if tags from the decoder or the stream are available. */
static void update_tags (const struct decoder *f, void *decoder_data,
struct io_stream *s)
{
char *stream_title = NULL;
int tags_changed = 0;
struct file_tags *new_tags;
new_tags = tags_new ();
LOCK (curr_tags_mut);
if (f->current_tags && f->current_tags(decoder_data, new_tags)
&& new_tags->title) {
tags_changed = 1;
tags_copy (curr_tags, new_tags);
logit ("Tags change from the decoder");
tags_source = TAGS_SOURCE_DECODER;
show_tags (curr_tags);
}
else if (s && (stream_title = io_get_metadata_title(s))) {
if (curr_tags && curr_tags->title
&& tags_source == TAGS_SOURCE_DECODER) {
logit ("New IO stream tags, ignored because there are "
"decoder tags present");
free (stream_title);
}
else {
tags_clear (curr_tags);
curr_tags->title = stream_title;
show_tags (curr_tags);
tags_changed = 1;
logit ("New IO stream tags");
tags_source = TAGS_SOURCE_METADATA;
}
}
if (tags_changed)
tags_change ();
tags_free (new_tags);
UNLOCK (curr_tags_mut);
}
static int
parse_exif( VipsImage *im, void *data, int data_length )
{
#ifdef HAVE_EXIF
{
ExifData *ed;
VipsExif ve;
if( !(ed = exif_data_new_from_data( data, data_length )) )
return( -1 );
#ifdef DEBUG_VERBOSE
show_tags( ed );
show_values( ed );
#endif /*DEBUG_VERBOSE*/
/* Attach informational fields for what we find.
FIXME ... better to have this in the UI layer?
Or we could attach non-human-readable tags here (int,
double etc) and then move the human stuff to the UI
layer?
*/
ve.image = im;
ve.ed = ed;
exif_data_foreach_content( ed,
(ExifDataForeachContentFunc) attach_exif_content, &ve );
/* Look for resolution fields and use them to set the VIPS
* xres/yres fields.
*/
res_from_exif( im, ed );
attach_thumbnail( im, ed );
exif_data_free( ed );
}
#endif /*HAVE_EXIF*/
return( 0 );
}
/* Scan the exif block on the image, if any, and make a set of vips metadata
* tags for what we find.
*/
int
vips__exif_parse( VipsImage *image )
{
void *data;
size_t length;
ExifData *ed;
VipsExifParams params;
const char *str;
if( !vips_image_get_typeof( image, VIPS_META_EXIF_NAME ) )
return( 0 );
if( vips_image_get_blob( image, VIPS_META_EXIF_NAME, &data, &length ) )
return( -1 );
if( !(ed = vips_exif_load_data_without_fix( data, length )) )
return( -1 );
#ifdef DEBUG_VERBOSE
show_tags( ed );
show_values( ed );
#endif /*DEBUG_VERBOSE*/
/* Look for resolution fields and use them to set the VIPS xres/yres
* fields.
*
* If the fields are missing, set them from the image, which will have
* previously had them set from something like JFIF.
*/
if( vips_image_resolution_from_exif( image, ed ) &&
vips_exif_resolution_from_image( ed, image ) ) {
exif_data_free( ed );
return( -1 );
}
/* Make sure all required fields are there before we attach the vips
* metadata.
*/
exif_data_fix( ed );
/* Attach informational fields for what we find.
*/
params.image = image;
params.ed = ed;
exif_data_foreach_content( ed,
(ExifDataForeachContentFunc) vips_exif_get_content, ¶ms );
vips_exif_get_thumbnail( image, ed );
exif_data_free( ed );
/* Orientation handling. ifd0 has the Orientation tag for the main
* image.
*/
if( vips_image_get_typeof( image, "exif-ifd0-Orientation" ) != 0 &&
!vips_image_get_string( image,
"exif-ifd0-Orientation", &str ) ) {
int orientation;
orientation = atoi( str );
orientation = VIPS_CLIP( 1, orientation, 8 );
vips_image_set_int( image, VIPS_META_ORIENTATION, orientation );
}
return( 0 );
}
static int
read_exif( IMAGE *im, void *data, int data_length )
{
char *data_copy;
/* Horrifyingly, some JPEGs have several APP1 sections. We must only
* use the first one that starts "Exif.."
*/
if( ((char *) data)[0] != 'E' ||
((char *) data)[1] != 'x' ||
((char *) data)[2] != 'i' ||
((char *) data)[3] != 'f' )
return( 0 );
if( im_header_get_typeof( im, IM_META_EXIF_NAME ) )
return( 0 );
/* Always attach a copy of the unparsed exif data.
*/
if( !(data_copy = im_malloc( NULL, data_length )) )
return( -1 );
memcpy( data_copy, data, data_length );
if( im_meta_set_blob( im, IM_META_EXIF_NAME,
(im_callback_fn) im_free, data_copy, data_length ) ) {
im_free( data_copy );
return( -1 );
}
#ifdef HAVE_EXIF
{
ExifData *ed;
if( !(ed = exif_data_new_from_data( data, data_length )) )
return( -1 );
if( ed->size > 0 ) {
#ifdef DEBUG_VERBOSE
show_tags( ed );
show_values( ed );
#endif /*DEBUG_VERBOSE*/
/* Attach informational fields for what we find.
FIXME ... better to have this in the UI layer?
Or we could attach non-human-readable tags here (int,
double etc) and then move the human stuff to the UI
layer?
*/
exif_data_foreach_content( ed,
(ExifDataForeachContentFunc) attach_exif_content, im );
/* Look for resolution fields and use them to set the VIPS
* xres/yres fields.
*/
set_vips_resolution( im, ed );
attach_thumbnail( im, ed );
}
exif_data_free( ed );
}
#endif /*HAVE_EXIF*/
return( 0 );
}
