From bfd09d7bf1a3cbaf8fae043fc39f7fe97612b825 Mon Sep 17 00:00:00 2001
From: aagaidiu <alexey.a.gaidiukov@intel.com>
Date: Wed, 23 Nov 2016 13:31:33 -0800
Subject: [PATCH] EMF: support negative bounding box coordinates

Similar to placeable WMF, bounding box coordinates
should be interpreted as signed integer, otherwise
opening EMF file with negative (x0,y0) fails.
---
 PIL/WmfImagePlugin.py | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/PIL/WmfImagePlugin.py b/PIL/WmfImagePlugin.py
index 9416035c0..1f03b4342 100644
--- a/PIL/WmfImagePlugin.py
+++ b/PIL/WmfImagePlugin.py
@@ -66,6 +66,11 @@ def short(c, o=0):
 
 dword = _binary.i32le
 
+def _long(c, o=0):
+    v = dword(c, o)
+    if v >= 1<<31:
+        v -= 1<<32
+    return v
 
 #
 # --------------------------------------------------------------------
@@ -121,10 +126,10 @@ class WmfStubImageFile(ImageFile.StubImageFile):
             # enhanced metafile
 
             # get bounding box
-            x0 = dword(s, 8)
-            y0 = dword(s, 12)
-            x1 = dword(s, 16)
-            y1 = dword(s, 20)
+            x0 = _long(s, 8)
+            y0 = _long(s, 12)
+            x1 = _long(s, 16)
+            y1 = _long(s, 20)
 
             # get frame (in 0.01 millimeter units)
             frame = dword(s, 24), dword(s, 28), dword(s, 32), dword(s, 36)