From d6aa225ca7990fde1eac09e28078e71b73d113ce Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Sun, 18 Sep 2011 17:02:26 -0400
Subject: Fix --disable-png behaviour in the Python module.

---
 libdimension-python/dimension.pyx | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

(limited to 'libdimension-python/dimension.pyx')

diff --git a/libdimension-python/dimension.pyx b/libdimension-python/dimension.pyx
index b8855fe..dffa8fa 100644
--- a/libdimension-python/dimension.pyx
+++ b/libdimension-python/dimension.pyx
@@ -569,9 +569,19 @@ cdef class Canvas:
       if fclose(file) != 0:
         _raise_OSError()
 
-    progress = _Progress(dmnsn_png_write_canvas_async(self._canvas, file))
-    progress._finalizer = finalize
-    return progress
+    cdef dmnsn_progress *progress = dmnsn_png_write_canvas_async(self._canvas,
+                                                                 file)
+
+    try:
+      if progress == NULL:
+        _raise_OSError()
+
+      ret = _Progress(progress)
+      ret._finalizer = finalize
+      return ret
+    except:
+      finalize()
+      raise
 
   def draw_GL(self):
     """Export the canvas to the current OpenGL context."""
-- 
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