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fix 'runtime error: left shift of negative value -12' error - refs #227

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Dane Springmeyer 2016-04-26 17:15:14 -07:00 committed by Eric Fischer
parent 87fea8082f
commit d35ef72a99
1 changed files with 3 additions and 2 deletions
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5
mvt.cc
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@ -5,6 +5,7 @@
#include <map>
#include <zlib.h>
#include "mvt.hh"
#include "protozero/varint.hpp"
#include "protozero/pbf_reader.hpp"
#include "protozero/pbf_writer.hpp"
@ -332,8 +333,8 @@ std::string mvt_tile::encode() {
int dx = wwx - px;
int dy = wwy - py;
geometry.push_back((dx << 1) ^ (dx >> 31));
geometry.push_back((dy << 1) ^ (dy >> 31));
geometry.push_back(protozero::encode_zigzag32(dx));
geometry.push_back(protozero::encode_zigzag32(dy));
px = wwx;
py = wwy;