[goffice] Fix pixbuf saving.

[Jean Bréfort <jbrefort src gnome org>]

commit da0411475ce7b28168bd5792403c04a83f4e76b4
Author: Jean Brefort <jean brefort normalesup org>
Date:   Wed May 6 19:46:43 2015 +0200

    Fix pixbuf saving.

 ChangeLog                |    5 +++++
 goffice/utils/go-image.c |    5 ++++-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 845bc5b..a9b81b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-05-06  Jean Brefort  <jean brefort normalesup org>
+
+       * goffice/utils/go-image.c (go_image_save): save original pixbuf data.
+       [see #748493, comments 13 and 14] 
+
 2015-05-04  Morten Welinder  <terra gnome org>
 
        * goffice/graph/gog-axis.c (axis_format_value): Allow caller to
diff --git a/goffice/utils/go-image.c b/goffice/utils/go-image.c
index d79eea8..7a9cb2e 100644
--- a/goffice/utils/go-image.c
+++ b/goffice/utils/go-image.c
@@ -770,7 +770,10 @@ go_image_save (GOImage *image, GsfXMLOut *output)
        gsf_xml_out_add_cstr (output, "type", G_OBJECT_TYPE_NAME (image));
        gsf_xml_out_add_int (output, "width", image->width);
        gsf_xml_out_add_int (output, "height", image->height);
-       ((GOImageClass *) G_OBJECT_GET_CLASS (image))->save (image, output);
+       if (image->data != NULL && image->data_length > 0)
+               gsf_xml_out_add_base64 (output, NULL, image->data, image->data_length);
+       else /* should this still happen? */
+               ((GOImageClass *) G_OBJECT_GET_CLASS (image))->save (image, output);
        gsf_xml_out_end_element (output);
 }