Index: src/cairo_renderer.cpp
===================================================================
--- src/cairo_renderer.cpp      (revision 700)
+++ src/cairo_renderer.cpp      (working copy)
@@ -469,7 +469,8 @@
         surface_(surface),
         context_(Cairo::Context::create(surface)),
         t_(m.getWidth(),m.getHeight(),m.getCurrentExtent(),offset_x,offset_y),
-        detector_(Envelope(-64 ,-64, m.getWidth() + 64 ,m.getHeight() + 64))
+        //detector_(Envelope(-64 ,-64, m.getWidth() + 64 ,m.getHeight() + 64))
+        detector_(Envelope(0 ,0, m.getWidth(),m.getHeight()))
    {
 #ifdef MAPNIK_DEBUG
       std::clog << "scale=" << m.scale() << "\n";
Index: src/agg_renderer.cpp
===================================================================
--- src/agg_renderer.cpp	(revision 700)
+++ src/agg_renderer.cpp	(working copy)
@@ -112,7 +112,8 @@
         t_(m.getWidth(),m.getHeight(),m.getCurrentExtent(),offset_x,offset_y),
         font_engine_(),
         font_manager_(font_engine_),
-        detector_(Envelope(-64 ,-64, m.getWidth() + 64 ,m.getHeight() + 64)),
+        //detector_(Envelope(-64 ,-64, m.getWidth() + 64 ,m.getHeight() + 64)),
+        detector_(Envelope(0 ,0, m.getWidth() ,m.getHeight())),
         ras_ptr(new rasterizer)
    {
       boost::optional bg = m.background();