From d86f158b9f5cd4185b1e83846282ce9f74b06807 Mon Sep 17 00:00:00 2001
From: Andrew Brown <brownan@gmail.com>
Date: Thu, 2 Sep 2010 23:19:15 -0400
Subject: [PATCH] re-render a chunk if the image is corrupt

---
 chunk.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/chunk.py b/chunk.py
index ffce3d7..3e8492b 100644
--- a/chunk.py
+++ b/chunk.py
@@ -103,7 +103,16 @@ class ChunkRenderer(object):
         dest_path = os.path.join(destdir, dest_filename)
 
         if os.path.exists(dest_path):
-            return dest_path
+            # Try to open it to see if it's corrupt or something (can happen if
+            # the program crashed last time)
+            try:
+                testimg = Image.open(dest_path)
+                testimg.load()
+            except Exception:
+                # guess not, continue below
+                pass
+            else:
+                return dest_path
         else:
             # Remove old images for this chunk
             for oldimg in os.listdir(destdir):