[nautilus/gnome-2-26] Don't load files for thumbnailing that we can't thumbnail anyway

[Alexander Larsson <alexl src gnome org>]

commit 048473e42ac2e37bd43159cda4394c11f7f68568
Author: Alexander Larsson <alexl redhat com>
Date:   Fri Sep 25 14:41:28 2009 +0200

    Don't load files for thumbnailing that we can't thumbnail anyway
    
    When zooming out we read the real image and use that as the thumbnail.
    However, we should only do this for files gdk-pixbuf can read as other
    things can't be read anyway and may potentially be very large (such as
    videos) since the thumbnail size limit only applies for images.
    
    Cherry picked from master

 libnautilus-private/nautilus-file.c       |    3 +-
 libnautilus-private/nautilus-thumbnails.c |   30 +++++++++++++++++++++++-----
 libnautilus-private/nautilus-thumbnails.h |    1 +
 3 files changed, 27 insertions(+), 7 deletions(-)
---
diff --git a/libnautilus-private/nautilus-file.c b/libnautilus-private/nautilus-file.c
index fb6d92b..a2a84f0 100644
--- a/libnautilus-private/nautilus-file.c
+++ b/libnautilus-private/nautilus-file.c
@@ -3588,7 +3588,8 @@ nautilus_file_get_icon (NautilusFile *file,
 			   since the zoom level 150% gives thumbnails at 144, which is
 			   ok to scale up from 128. */
 			if (modified_size > 128*1.25 &&
-			    !file->details->thumbnail_wants_original) {
+			    !file->details->thumbnail_wants_original &&
+			    nautilus_can_thumbnail_internally (file)) {
 				/* Invalidate if we resize upward */
 				file->details->thumbnail_wants_original = TRUE;
 				nautilus_file_invalidate_attributes (file, NAUTILUS_FILE_ATTRIBUTE_THUMBNAIL);
diff --git a/libnautilus-private/nautilus-thumbnails.c b/libnautilus-private/nautilus-thumbnails.c
index f064135..2a3fede 100644
--- a/libnautilus-private/nautilus-thumbnails.c
+++ b/libnautilus-private/nautilus-thumbnails.c
@@ -765,17 +765,35 @@ get_types_table (void)
 	return image_mime_types;
 }
 
-gboolean
-nautilus_thumbnail_is_mimetype_limited_by_size (const char *mime_type)
+static gboolean
+pixbuf_can_load_type (const char *mime_type)
 {
 	GHashTable *image_mime_types;
-	
+
 	image_mime_types = get_types_table ();
-        if (g_hash_table_lookup (image_mime_types, mime_type)) {
-                return TRUE;
+	if (g_hash_table_lookup (image_mime_types, mime_type)) {
+		return TRUE;
 	}
 
-        return FALSE;
+	return FALSE;
+}
+
+gboolean
+nautilus_can_thumbnail_internally (NautilusFile *file)
+{
+	char *mime_type;
+	gboolean res;
+
+	mime_type = nautilus_file_get_mime_type (file);
+	res = pixbuf_can_load_type (mime_type);
+	g_free (mime_type);
+	return res;
+}
+
+gboolean
+nautilus_thumbnail_is_mimetype_limited_by_size (const char *mime_type)
+{
+	return pixbuf_can_load_type (mime_type);
 }
 
 gboolean
diff --git a/libnautilus-private/nautilus-thumbnails.h b/libnautilus-private/nautilus-thumbnails.h
index 82007ba..3028c92 100644
--- a/libnautilus-private/nautilus-thumbnails.h
+++ b/libnautilus-private/nautilus-thumbnails.h
@@ -47,6 +47,7 @@ typedef void (* NautilusThumbnailAsyncLoadFunc) (NautilusThumbnailAsyncLoadHandl
 void       nautilus_create_thumbnail                (NautilusFile *file);
 gboolean   nautilus_can_thumbnail                   (NautilusFile *file);
 gboolean   nautilus_has_valid_failed_thumbnail      (NautilusFile *file);
+gboolean   nautilus_can_thumbnail_internally        (NautilusFile *file);
 gboolean   nautilus_thumbnail_is_mimetype_limited_by_size
 						    (const char *mime_type);
 void       nautilus_thumbnail_frame_image           (GdkPixbuf **pixbuf);