From 8fec4ef9fc616b2d79ec3a9c1ac7d95e82a1e1ce Mon Sep 17 00:00:00 2001
From: Eric Fischer <enf@pobox.com>
Date: Wed, 15 Oct 2014 16:34:49 -0700
Subject: [PATCH] Return immediately instead of failing to clip polygons to the
 z0 tile

---
 tile.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tile.cc b/tile.cc
index eabf5b1e..85bebf10 100644
--- a/tile.cc
+++ b/tile.cc
@@ -477,6 +477,10 @@ static drawvec clip_poly1(drawvec &geom, int z, int detail) {
 }
 
 drawvec clip_poly(drawvec &geom, int z, int detail) {
+	if (z == 0) {
+		return geom;
+	}
+
 	drawvec out;
 
 	for (unsigned i = 0; i < geom.size(); i++) {