[gthumb] resize image: clear the metadata after resizing

[Paolo Bacchilega <paobac src gnome org>]

commit ef163c3041b2fcac269dffc12366083e1cad511f
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Oct 6 18:11:13 2013 +0200

    resize image: clear the metadata after resizing

 extensions/file_tools/gth-file-tool-resize.c |    1 +
 gthumb/cairo-utils.c                         |   27 +++++++++++++++++++++----
 gthumb/cairo-utils.h                         |    1 +
 3 files changed, 24 insertions(+), 5 deletions(-)
---
diff --git a/extensions/file_tools/gth-file-tool-resize.c b/extensions/file_tools/gth-file-tool-resize.c
index 72e1d52..fb55cc3 100644
--- a/extensions/file_tools/gth-file-tool-resize.c
+++ b/extensions/file_tools/gth-file-tool-resize.c
@@ -183,6 +183,7 @@ resize_task_exec (GthAsyncTask *task,
                                                  self->priv->new_height,
                                                  (self->priv->high_quality ? SCALE_FILTER_BEST : 
SCALE_FILTER_FAST),
                                                  task);
+       _cairo_image_surface_clear_metadata (destination);
        gth_image_task_set_destination_surface (GTH_IMAGE_TASK (task), destination);
 
        cairo_surface_destroy (destination);
diff --git a/gthumb/cairo-utils.c b/gthumb/cairo-utils.c
index 807d659..ae27f36 100644
--- a/gthumb/cairo-utils.c
+++ b/gthumb/cairo-utils.c
@@ -120,6 +120,17 @@ _cairo_image_surface_flush_and_get_data (cairo_surface_t *surface)
 }
 
 
+static void
+_cairo_surface_metadata_init (cairo_surface_metadata_t *metadata)
+{
+       metadata->has_alpha = FALSE;
+       metadata->original_width = 0;
+       metadata->original_height = 0;
+       metadata->thumbnail.image_width = 0;
+       metadata->thumbnail.image_height = 0;
+}
+
+
 cairo_surface_metadata_t *
 _cairo_image_surface_get_metadata (cairo_surface_t *surface)
 {
@@ -128,11 +139,7 @@ _cairo_image_surface_get_metadata (cairo_surface_t *surface)
        metadata = cairo_surface_get_user_data (surface, &surface_metadata_key);
        if (metadata == NULL) {
                metadata = g_new0 (cairo_surface_metadata_t, 1);
-               metadata->has_alpha = FALSE;
-               metadata->original_width = 0;
-               metadata->original_height = 0;
-               metadata->thumbnail.image_width = 0;
-               metadata->thumbnail.image_height = 0;
+               _cairo_surface_metadata_init (metadata);
                cairo_surface_set_user_data (surface, &surface_metadata_key, metadata, surface_metadata_free);
        }
 
@@ -159,6 +166,16 @@ _cairo_image_surface_copy_metadata (cairo_surface_t *src,
 }
 
 
+void
+_cairo_image_surface_clear_metadata (cairo_surface_t *surface)
+{
+       cairo_surface_metadata_t *metadata;
+
+       metadata = _cairo_image_surface_get_metadata (surface);
+       _cairo_surface_metadata_init (metadata);
+}
+
+
 gboolean
 _cairo_image_surface_get_has_alpha (cairo_surface_t *surface)
 {
diff --git a/gthumb/cairo-utils.h b/gthumb/cairo-utils.h
index 521f310..84ca643 100644
--- a/gthumb/cairo-utils.h
+++ b/gthumb/cairo-utils.h
@@ -169,6 +169,7 @@ cairo_surface_metadata_t *
                   _cairo_image_surface_get_metadata        (cairo_surface_t       *surface);
 void               _cairo_image_surface_copy_metadata       (cairo_surface_t      *src,
                                                             cairo_surface_t       *dest);
+void               _cairo_image_surface_clear_metadata      (cairo_surface_t      *surface);
 gboolean           _cairo_image_surface_get_has_alpha       (cairo_surface_t       *surface);
 gboolean           _cairo_image_surface_get_original_size   (cairo_surface_t       *surface,
                                                             int                   *original_width,