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// 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 int ToRoundedInt(double value) {
double rounded;
if (value >= 0.0)
rounded = std::floor(value + 0.5);
else
rounded = std::ceil(value - 0.5);
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_
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