From ac608afdfedb618e0d47d995797f86d2e121f48a Mon Sep 17 00:00:00 2001
From: zonkx <36549474+zonkx@users.noreply.github.com>
Date: Fri, 16 Feb 2018 20:57:12 +0100
Subject: [PATCH] Round alpha correctly in bilinear image scaling code too

Add 0.5 to round the alpha values correctly too, just as it was already
done in f4c9767b493e9239bb3548ebb49e1c3d492e8bdc for the RGB values.

Closes https://github.com/wxWidgets/wxWidgets/pull/733
---
 src/common/image.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/common/image.cpp b/src/common/image.cpp
index 31b69845cb2a..846eeee64f69 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -844,7 +844,7 @@ wxImage wxImage::ResampleBilinear(int width, int height) const
             dst_data += 3;
 
             if ( src_alpha )
-                *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy);
+                *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy +.5);
         }
     }