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