1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
6#define UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
7
8#include <cmath>
9#include <limits>
10
11#include "ui/gfx/gfx_export.h"
12
13namespace gfx {
14
15inline int ClampToInt(float value) {
16  if (value != value)
17    return 0; // no int NaN.
18  if (value >= std::numeric_limits<int>::max())
19    return std::numeric_limits<int>::max();
20  if (value <= std::numeric_limits<int>::min())
21    return std::numeric_limits<int>::min();
22  return static_cast<int>(value);
23}
24
25inline int ToFlooredInt(float value) {
26  return ClampToInt(std::floor(value));
27}
28
29inline int ToCeiledInt(float value) {
30  return ClampToInt(std::ceil(value));
31}
32
33inline int ToRoundedInt(float value) {
34  float rounded;
35  if (value >= 0.0f)
36    rounded = std::floor(value + 0.5f);
37  else
38    rounded = std::ceil(value - 0.5f);
39  return ClampToInt(rounded);
40}
41
42inline bool IsExpressibleAsInt(float value) {
43  if (value != value)
44    return false; // no int NaN.
45  if (value > std::numeric_limits<int>::max())
46    return false;
47  if (value < std::numeric_limits<int>::min())
48    return false;
49  return true;
50}
51
52}  // namespace gfx
53
54#endif  // UI_GFX_GEOMETRY_SAFE_INTEGER_CONVERSIONS_H_
55