[postr] Rotate thumbnail's in File Chooser (#608494)

[Germán Poó Caamaño <gpoo src gnome org>]

commit 7a34bdf63f248d53d18193a4feb295d8ef1604b6
Author: Germán Póo-Caamaño <gpoo gnome org>
Date:   Mon Feb 1 19:00:44 2010 -0300

    Rotate thumbnail's in File Chooser (#608494)
    
    Added function get_thumbnail to look up the image's thumbnail
    using the GNOME Thumbnail Factory.  It creates the thumbnail
    when does not exist.
    
    The GNOME Thumbnail Factory rotates the thumbnail according the
    EXIF information.

 src/postr.py |   43 +++++++++++++++++++++++++++++++++++++++----
 1 files changed, 39 insertions(+), 4 deletions(-)
---
diff --git a/src/postr.py b/src/postr.py
index e699404..0e5142a 100644
--- a/src/postr.py
+++ b/src/postr.py
@@ -21,6 +21,8 @@ from os.path import basename
 
 import pygtk; pygtk.require ("2.0")
 import gobject, gtk, gtk.glade, gconf, gio
+import gnome.ui
+
 
 try:
     import gtkspell
@@ -425,15 +427,48 @@ class Postr(UniqueApp):
         # Add a preview widget
         preview = gtk.Image()
         dialog.set_preview_widget(preview)
+
+        def get_thumbnail(uri):
+            # Given a uri, return a Pixbuf with the thumbnail or
+            # None in case is not possible to get it or
+            # generate it.
+
+            gfile = gio.File(uri)
+            ginfo = gfile.query_info('time::modified,standard::content-type')
+            mtime = ginfo.get_modification_time()
+            mime = ginfo.get_content_type()
+
+            factory = gnome.ui.ThumbnailFactory(gnome.ui.THUMBNAIL_SIZE_NORMAL)
+            thumb_path = factory.lookup(uri, int(mtime))
+
+            if thumb_path:
+                return gtk.gdk.pixbuf_new_from_file(thumb_path)
+
+            # There is no thumbmail, we will try to generate one
+            # or return None if not possible
+            if factory.can_thumbnail(uri, mime, int(mtime)):
+                thumbnail = factory.generate_thumbnail(uri, mime)
+                if thumbnail is not None:
+                    factory.save_thumbnail(thumbnail, uri, int(mtime))
+                return thumbnail
+            else:
+                return None
+
         def update_preview_cb(file_chooser, preview):
             filename = file_chooser.get_preview_filename()
-            try:
-                pixbuf = gtk.gdk.pixbuf_new_from_file_at_size(filename, 128, 128)
-                preview.set_from_pixbuf(pixbuf)
+            uri = file_chooser.get_preview_uri()
+
+            if uri:
+                thumbnail = get_thumbnail(uri)
+
+            if uri and thumbnail:
+                preview.set_from_pixbuf(thumbnail)
                 have_preview = True
-            except:
+            else:
                 have_preview = False
+
             file_chooser.set_preview_widget_active(have_preview)
+
         dialog.connect("update-preview", update_preview_cb, preview)
         
         if dialog.run() == gtk.RESPONSE_OK: