1 files changed, 54 insertions, 0 deletions
diff --git a/chromium/ui/gfx/geometry/safe_integer_conversions.h b/chromium/ui/gfx/geometry/safe_integer_conversions.h
new file mode 100644
index 00000000000..4d289ecabaf
--- /dev/null
+++ b/chromium/ui/gfx/geometry/safe_integer_conversions.h
@@ -0,0 +1,54 @@
+// 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.
+
+#ifndef UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
+#define UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
+
+#include <cmath>
+#include <limits>
+
+#include "ui/gfx/gfx_export.h"
+
+namespace gfx {
+
+inline 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);
+}
+
+inline int ToFlooredInt(float value) {
+  return ClampToInt(std::floor(value));
+}
+
+inline int ToCeiledInt(float value) {
+  return ClampToInt(std::ceil(value));
+}
+
+inline int ToRoundedInt(float value) {
+  float rounded;
+  if (value >= 0.0f)
+    rounded = std::floor(value + 0.5f);
+  else
+    rounded = std::ceil(value - 0.5f);
+  return ClampToInt(rounded);
+}
+
+inline bool IsExpressibleAsInt(float value) {
+  if (value != value)
+    return false; // no int NaN.
+  if (value > std::numeric_limits<int>::max())
+    return false;
+  if (value < std::numeric_limits<int>::min())
+    return false;
+  return true;
+}
+
+}  // namespace gfx
+
+#endif  // UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_