From cb31692f3794259876b554ab96ac79a5b87508cf Mon Sep 17 00:00:00 2001
From: artemp <artem@mapnik.org>
Date: Fri, 30 Oct 2015 16:47:26 +0000
Subject: [PATCH] image : fix buffer's copy ctor - only std::copy when rhs owns
 the data (#3152)

---
 src/image.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/image.cpp b/src/image.cpp
index 32c843388..5141860b7 100644
--- a/src/image.cpp
+++ b/src/image.cpp
@@ -59,10 +59,11 @@ buffer::buffer(buffer && rhs) noexcept
 // copy
 buffer::buffer(buffer const& rhs)
     : size_(rhs.size_),
-      data_(static_cast<unsigned char*>(size_ != 0 ? ::operator new(size_) : nullptr)),
-      owns_(true)
+      data_(static_cast<unsigned char*>((rhs.owns_ && size_ != 0) ? ::operator new(size_) : nullptr)),
+      owns_(rhs.owns_)
 {
     if (data_) std::copy(rhs.data_, rhs.data_ + rhs.size_, data_);
+    else data_ = rhs.data_;
 }
 
 buffer::~buffer()