From: David Lechner <david@lechnology.com>
Date: Sat, 23 Jul 2016 02:20:30 +0000 (-0500)
Subject: Fix misaligned bits when writing .rfg
X-Git-Tag: 7.0.2-6~14
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7cbd11037d7fca2552014b60aef66c40e74a899d;p=imagemagick

Fix misaligned bits when writing .rfg

When writing LEGO MINDSTORMS EV3 .rfg file, if the image is not a
multiple of 8 pixels wide, the pixels in the last byte are not aligned
correctly. The pixels need to be shifted the number of bits that are
not used in the last byte.
---

diff --git a/coders/rgf.c b/coders/rgf.c
index 92e0313c6..a09399013 100644
--- a/coders/rgf.c
+++ b/coders/rgf.c
@@ -379,7 +379,10 @@ static MagickBooleanType WriteRGFImage(const ImageInfo *image_info,Image *image,
       p+=GetPixelChannels(image);
     }
     if (bit != 0)
+    {
+      byte >>= 8 - bit;
       (void) WriteBlobByte(image,(unsigned char) byte);
+    }
     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,
       image->rows);
     if (status == MagickFalse)