[gthumb] cairo scale: copy the metadata from the original image

[Paolo Bacchilega <paobac src gnome org>]

commit 11a55d01fb95a1bb39e69baaf3538169e0612725
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Oct 6 14:23:27 2013 +0200

    cairo scale: copy the metadata from the original image

 gthumb/cairo-scale.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/gthumb/cairo-scale.c b/gthumb/cairo-scale.c
index 14dbd38..28c482d 100644
--- a/gthumb/cairo-scale.c
+++ b/gthumb/cairo-scale.c
@@ -522,9 +522,12 @@ _cairo_image_surface_scale (cairo_surface_t  *image,
        scaled = _cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
                                              scaled_width,
                                              scaled_height);
+       _cairo_image_surface_copy_metadata (image, scaled);
        metadata = _cairo_image_surface_get_metadata (scaled);
-       metadata->original_width = src_width;
-       metadata->original_height = src_height;
+       if (metadata->original_width <= 0) {
+               metadata->original_width = src_width;
+               metadata->original_height = src_height;
+       }
 
        if (scaled == NULL)
                return NULL;