--- a/degal/render.py	Fri Jun 05 19:29:04 2009 +0300
+++ b/degal/render.py	Fri Jun 05 19:30:15 2009 +0300
@@ -4,8 +4,6 @@
 
 import PIL.Image
 
-import os.path
-
 class RenderMachine (object) :
     """
         RAWR! I'm the render machine!
@@ -20,11 +18,16 @@
 
         self.config = config
 
-    def render_out (self, img, size, out_path) :
+    def render_out (self, image, size, file) :
         """
-            Creates a thumbnail from the given PIL.Image of the given size, and saves it at out_path.
+            Creates a thumbnail from the given Image of the given `size`, and saves it at `out`.
+
+            Returns the file for convenience
         """
 
+        # load the PIL.Image
+        img = image.load_image()
+
         # we need to create a copy, as .thumbnail mutates the Image
         img_out = img.copy()
 
@@ -32,20 +35,23 @@
         img_out.thumbnail(size, resample=True)
 
         # and write out
-        img_out.save(out_path)
+        img_out.save(file.path)
 
-    def render_img (self, img, dirname, filename) :
+        return file
+   
+    def render_lazy (self, image, size, out) :
         """
-            Renders new thumbnails/previews from the given loaded image and filename based on the current configuration.
-            
-            Note: this does not check for the existance of the thumbs/previews subdirs!
+            Renders the given image with render_out if `out` does not yet exist or is older than image.
         """
 
-        # once for each size
-        for subdir, size in (
-            (self.config.thumb_dir, self.config.thumb_size),
-            (self.config.preview_dir, self.config.preview_size)
-        ) :
-            # resize and write out
-            self.render_out(img, size, os.path.join(dirname, subdir, filename)
+        # stat the output file
+        out_stat = out.stat(soft=True)
 
+        # compare
+        if not out_stat or out_stat.st_mtime < image.load_stat().st_mtime :
+            # render anew
+            return self.render_out(image, size, file)
+
+        else :
+            # already rendered
+            return file