Add support for writing external EXIF metadata back to images

Turned off by default, this will copy all data from supplied external
EXIF metadata file back to all generated image files. All user overrides
are still applied on top of it.

Another reason for turning this off is file size concern, target image
files would carry a lot more information that may not be always needed and
would increase total amount of data transferred.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/jpeg-utils.cpp b/src/jpeg-utils.cpp
index 6483563..321a9b6 100644
--- a/src/jpeg-utils.cpp
+++ b/src/jpeg-utils.cpp
@@ -129,6 +129,7 @@ exif_data_free (ExifData *data)
 {
   if (data) {
     g_free (data->override_copyright);
+    g_free (data->external_exif_data);
     /* FIXME: free data->priv->image */
     g_free (data->priv);
     g_free (data);
@@ -663,6 +664,18 @@ modify_exif (const gchar *filename, ExifData *exif, gboolean strip_thumbnail)
     g_assert (image.get() != 0);
 
     image->readMetadata();
+
+    /*  Write down metadata from external file if supplied  */
+    if (exif && exif->external_exif_data) {
+      Exiv2::Image::AutoPtr ext_image = Exiv2::ImageFactory::open (exif->external_exif_data);
+      if (ext_image.get() != 0) {
+        ext_image->clearMetadata();
+        ext_image->readMetadata();
+        image->setMetadata (*ext_image);
+        modified = TRUE;
+      }
+    }
+
     Exiv2::ExifData &exifData = image->exifData();
     Exiv2::IptcData &iptcData = image->iptcData();