| // 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 ToFlooredInt(double value) { |
| return ClampToInt(std::floor(value)); |
| } |
| |
| inline int ToCeiledInt(double 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_ |