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_SAFE_INTEGER_CONVERSIONS_H_ 6 #define UI_GFX_SAFE_INTEGER_CONVERSIONS_H_ 7 8 #include <cmath> 9 #include <limits> 10 11 #include "ui/gfx/gfx_export.h" 12 13 namespace gfx { 14 ClampToInt(float value)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 ToFlooredInt(float value)25inline int ToFlooredInt(float value) { 26 return ClampToInt(std::floor(value)); 27 } 28 ToCeiledInt(float value)29inline int ToCeiledInt(float value) { 30 return ClampToInt(std::ceil(value)); 31 } 32 ToRoundedInt(float value)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 IsExpressibleAsInt(float value)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_SAFE_INTEGER_CONVERSIONS_H_ 55