[x265] [PATCH] Patch for issue #422 - Credit to Dimitry Andric

[praveen at multicorewareinc.com]

# HG changeset patch
# User Praveen Tiwari <praveen at multicorewareinc.com>
# Date 1534424221 -19800
#      Thu Aug 16 18:27:01 2018 +0530
# Node ID 88ee12651e3031dc1fc2f3f6a8bbac5f67839579
# Parent  cbc24109c1c849c027b5f087c6ff5f2087cb7301
Patch for issue #422 - Credit to Dimitry Andric.

This is due to undefined behavior in cuTreeFix8Pack(), where a double
value is cast directly to uint16_t.  If the double value is negative,
the resulting value from the cast is undefined.

diff -r cbc24109c1c8 -r 88ee12651e30 source/common/pixel.cpp
--- a/source/common/pixel.cpp	Tue Aug 14 18:01:51 2018 +0530
+++ b/source/common/pixel.cpp	Thu Aug 16 18:27:01 2018 +0530
@@ -922,7 +922,7 @@
 static void cuTreeFix8Pack(uint16_t *dst, double *src, int count)
 {
     for (int i = 0; i < count; i++)
-        dst[i] = (uint16_t)(src[i] * 256.0);
+        dst[i] = (uint16_t)(int16_t)(src[i] * 256.0);
 }
 
 static void cuTreeFix8Unpack(double *dst, uint16_t *src, int count)