mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Pieter De Baets
56e9aa369f
Summary: Noticed that we emit a large amount of (admittedly cheap) mountitems as part of node creation for values that are all zero (e.g. padding, overflowinset), which we can assume to be already initialised with these values on the native side. There's a further opportunity to do this for State as well, as ReactImageComponentState exports just empty maps to Java. Changelog: [Internal] Reviewed By: genkikondo Differential Revision: D36345402 fbshipit-source-id: 8d776ca124bdb9e1cd4de57a04e2785a9a0f918c
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and 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 <tuple>
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#include <folly/Hash.h>
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#include <react/renderer/graphics/Float.h>
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#include <react/renderer/graphics/Rect.h>
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namespace facebook {
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namespace react {
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/*
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* Generic data structure describes some values associated with *edges*
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* of a rectangle.
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*/
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template <typename T>
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struct RectangleEdges {
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T left{};
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T top{};
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T right{};
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T bottom{};
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bool operator==(RectangleEdges<T> const &rhs) const noexcept {
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return std::tie(this->left, this->top, this->right, this->bottom) ==
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std::tie(rhs.left, rhs.top, rhs.right, rhs.bottom);
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}
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bool operator!=(RectangleEdges<T> const &rhs) const noexcept {
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return !(*this == rhs);
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}
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bool isUniform() const noexcept {
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return left == top && left == right && left == bottom;
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}
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static RectangleEdges<T> const ZERO;
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};
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template <typename T>
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constexpr RectangleEdges<T> const RectangleEdges<T>::ZERO = {};
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template <typename T>
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RectangleEdges<T> operator+(
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RectangleEdges<T> const &lhs,
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RectangleEdges<T> const &rhs) noexcept {
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return RectangleEdges<T>{
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lhs.left + rhs.left,
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lhs.top + rhs.top,
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lhs.right + rhs.right,
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lhs.bottom + rhs.bottom};
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}
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template <typename T>
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RectangleEdges<T> operator-(
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RectangleEdges<T> const &lhs,
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RectangleEdges<T> const &rhs) noexcept {
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return RectangleEdges<T>{
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lhs.left - rhs.left,
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lhs.top - rhs.top,
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lhs.right - rhs.right,
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lhs.bottom - rhs.bottom};
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}
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/*
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* EdgeInsets
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*/
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using EdgeInsets = RectangleEdges<Float>;
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/*
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* Adjusts a rectangle by the given edge insets.
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*/
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inline Rect insetBy(Rect const &rect, EdgeInsets const &insets) noexcept {
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return Rect{
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{rect.origin.x + insets.left, rect.origin.y + insets.top},
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{rect.size.width - insets.left - insets.right,
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rect.size.height - insets.top - insets.bottom}};
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}
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} // namespace react
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} // namespace facebook
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namespace std {
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template <typename T>
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struct hash<facebook::react::RectangleEdges<T>> {
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size_t operator()(
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facebook::react::RectangleEdges<T> const &edges) const noexcept {
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return folly::hash::hash_combine(
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0, edges.left, edges.right, edges.top, edges.bottom);
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}
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};
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} // namespace std
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