From: Cristy <mikayla-grace@urban-warrior.org>
Date: Sat, 16 Feb 2019 00:25:39 +0000 (-0500)
Subject: Respect read mask
X-Git-Tag: 7.0.8-28~10
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0236be58cd37e9ee6b75e1da6d8c32c05067cb67;p=imagemagick

Respect read mask
---

diff --git a/MagickCore/compare.c b/MagickCore/compare.c
index 07cb31f34..f60a32722 100644
--- a/MagickCore/compare.c
+++ b/MagickCore/compare.c
@@ -430,6 +430,13 @@ static MagickBooleanType GetAbsoluteDistortion(const Image *image,
       register ssize_t
         i;
 
+      if ((GetPixelReadMask(image,p) <= (QuantumRange/2)) ||
+          (GetPixelReadMask(reconstruct_image,q) <= (QuantumRange/2)))
+        {
+          p+=GetPixelChannels(image);
+          q+=GetPixelChannels(reconstruct_image);
+          continue;
+        }
       difference=MagickFalse;
       distance=0.0;
       Sa=QuantumScale*GetPixelAlpha(image,p);