use lrintf to round from float to int instead of round and then cast.

BUG=393
TESTED=local windows test passed.
R=harryjin@google.com

Review URL: https://webrtc-codereview.appspot.com/37899004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1257 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1257
+Version: 1258
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1257
+#define LIBYUV_VERSION 1258
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

unit_test/color_test.cc

@@ -8,7 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
-#include <math.h>  // For round
+#include <math.h>  // For lrintf
 #include <stdlib.h>
 
 #include "libyuv/convert.h"

unit_test/convert_test.cc

@@ -8,6 +8,7 @@
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <math.h>  // For lrintf
 #include <stdlib.h>
 #include <time.h>
 
@@ -1248,7 +1249,7 @@ TEST_F(libyuvTest, TestYToARGB) {
   uint8 expectedg[32];
   for (int i = 0; i < 32; ++i) {
     y[i] = i * 5 + 17;
-    expectedg[i] = round((y[i] - 16) * 1.164);
+    expectedg[i] = lrintf((y[i] - 16) * 1.164);
   }
   uint8 argb[32 * 4];
   YToARGB(y, 0, argb, 0, 32, 1);