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