From f9b77942d8b694f1fdca198074a7a2e231f8b3b3 Mon Sep 17 00:00:00 2001
From: BoboTiG <bobotig@gmail.com>
Date: Fri, 22 Apr 2016 19:53:39 +0200
Subject: [PATCH] Fix #7: libpng warning on linux (ignoring bad filter type)

---
 mss/helpers.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mss/helpers.py b/mss/helpers.py
index 29cad415..5cc6c6a8 100644
--- a/mss/helpers.py
+++ b/mss/helpers.py
@@ -99,8 +99,9 @@ def to_png(self, data, width, height, output):
             b = pack
             line = (width * 3 + 3) & -4
             padding = 0 if line % 8 == 0 else (line % 8) // 2
+            filter = b(b'>B', 0)
             scanlines = b''.join(
-                [b'0' + data[y * line:y * line + line - padding]
+                [filter + data[y * line:y * line + line - padding]
                  for y in range(height)])
 
             magic = b(b'>8B', 137, 80, 78, 71, 13, 10, 26, 10)