Add gfx::ToRoundedInt safe conversion method from float to int.

ui/gfx/safe_integer_conversions.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cmath>

[tfarina, 2012/10/10 00:26:02]

aren't you missing the include:

#include "ui/gfx/safe_integer_conversions.h"

?

[danakj, 2012/10/10 00:28:04]

looks like it.

 #include <limits>
 
 namespace gfx {
 
 int ClampToInt(float value) {
   if (value != value)
      return 0; // no int NaN.
   if (value > std::numeric_limits<int>::max())
     return std::numeric_limits<int>::max();
   if (value < std::numeric_limits<int>::min())
     return std::numeric_limits<int>::min();
   return static_cast<int>(value);
 }
 
 int ToFlooredInt(float value) {
   return ClampToInt(std::floor(value));
 }
 
 int ToCeiledInt(float value) {
   return ClampToInt(std::ceil(value));
 }
 
+int ToRoundedInt(float value) {

[tfarina, 2012/10/10 00:26:02]

Looks like this is what SymmetricRound() is trying to do.

After you land this, I'll get rid of SymmetricRound() and convert the calls to
gfx::ToRoundedInt().

[danakj, 2012/10/10 00:28:04]

cool :)

+  float rounded;
+  if (value >= 0.0f)
+    rounded = std::floor(value + 0.5f);
+  else
+    rounded = std::ceil(value - 0.5f);
+  return ClampToInt(rounded);
+}
+
 }  // namespace gfx
 

[tfarina, 2012/10/10 00:26:02]

rm extra blank line.

[danakj, 2012/10/10 00:28:04]

Done.