From: John Koleszar <jkoleszar@google.com>
Date: Fri, 19 Apr 2013 15:57:03 +0000 (-0700)
Subject: Make Rand8Extremes more extreme
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=fd44975bc8a8b85831e1e153ce566dd2ef0a6b70;p=libvpx

Make Rand8Extremes more extreme

Previous code didn't do what was expected, we want numbers within 16 of
the extrema.

Change-Id: I20c18627c482ec66e8405ddad74ca9276c0c65dc
---

diff --git a/test/acm_random.h b/test/acm_random.h
index cd33d1268..56feaa234 100644
--- a/test/acm_random.h
+++ b/test/acm_random.h
@@ -38,7 +38,7 @@ class ACMRandom {
     // Returns a random value near 0 or near 255, to better exercise
     // saturation behavior.
     const uint8_t r = Rand8();
-    return r < 128 ? r << 4 : r >> 4;
+    return r <= 128 ? 255 - (r >> 4) : r >> 4;
   }
 
   int PseudoUniform(int range) {