GT2/Ejectable/node_modules/react-native/ReactCommon/fabric/graphics/rounding.h

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2021-08-16 00:14:59 +00:00
/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#pragma once
#include <react/graphics/Float.h>
namespace facebook {
namespace react {
/*
* Convenience functions for rounding float values to be aligned with a device
* pixel grid.
*
* Usage example:
* auto scaleFactor = Float{3};
* auto value = Float{42.9001};
* auto crispValue = roundToPixel<&std::ceil>(value, scaleFactor);
* auto size = Size{value, value + 42.0};
* auto crispSize = roundToPixel<&std::ceil>(size, scaleFactor);
*/
template <Float (*RoundingFunction)(Float)>
Float roundToPixel(Float value, Float scaleFactor) {
return RoundingFunction(value * scaleFactor) / scaleFactor;
}
template <Float (*RoundingFunction)(Float)>
Point roundToPixel(Point value, Float scaleFactor) {
return Point{roundToPixel<RoundingFunction>(value.x, scaleFactor),
roundToPixel<RoundingFunction>(value.y, scaleFactor)};
}
template <Float (*RoundingFunction)(Float)>
Size roundToPixel(Size value, Float scaleFactor) {
return Size{roundToPixel<RoundingFunction>(value.width, scaleFactor),
roundToPixel<RoundingFunction>(value.height, scaleFactor)};
}
template <Float (*RoundingFunction)(Float)>
Rect roundToPixel(Rect value, Float scaleFactor) {
return Rect{roundToPixel<RoundingFunction>(value.origin),
roundToPixel<RoundingFunction>(value.size)};
}
/*
* GCC-based Android NDK does not have rounding functions as part of STL.
*/
inline float round(float value) noexcept {
return ::roundf(value);
}
inline double round(double value) noexcept {
return ::round(value);
}
inline long double round(long double value) noexcept {
return ::roundl(value);
}
inline float ceil(float value) noexcept {
return ::ceilf(value);
}
inline double ceil(double value) noexcept {
return ::ceil(value);
}
inline long double ceil(long double value) noexcept {
return ::ceill(value);
}
inline float floor(float value) noexcept {
return ::floorf(value);
}
inline double floor(double value) noexcept {
return ::floor(value);
}
inline long double floor(long double value) noexcept {
return ::floorl(value);
}
} // namespace react
} // namespace facebook