mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Samuel Susla
d41e95fb1a
Summary: changelog: [internal] This diff introduces a mechanism to cache NSTextStorage on Paragraph's state. The old renderer already has caching for NSTextStorage: https://github.com/facebook/react-native/blob/main/Libraries/Text/Text/RCTTextShadowView.m#L21 Fabric will store `NSTextStorage` inside `ParagraphLayoutManager` which is owned by state. There is one notable change which is not gated: Paragraph's state strongly owns `TextLayoutManager`, not `ParagraphShadowNode` like previously. This shouldn't change anything Reviewed By: mdvacca Differential Revision: D43692171 fbshipit-source-id: efe6077222a30ab6d89abd9916534b9a96e745d4
60 lines
1.8 KiB
C++
60 lines
1.8 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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#include "ParagraphLayoutManager.h"
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#include <folly/Hash.h>
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#include <react/renderer/core/CoreFeatures.h>
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namespace facebook::react {
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TextMeasurement ParagraphLayoutManager::measure(
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AttributedString const &attributedString,
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ParagraphAttributes const ¶graphAttributes,
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LayoutConstraints layoutConstraints) const {
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if (CoreFeatures::cacheNSTextStorage) {
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size_t newHash = folly::hash::hash_combine(
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0,
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textAttributedStringHashLayoutWise(attributedString),
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paragraphAttributes);
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if (!hostTextStorage_ || newHash != hash_) {
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hostTextStorage_ = textLayoutManager_->getHostTextStorage(
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attributedString, paragraphAttributes, layoutConstraints);
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hash_ = newHash;
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}
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}
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return textLayoutManager_->measure(
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AttributedStringBox(attributedString),
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paragraphAttributes,
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layoutConstraints,
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hostTextStorage_);
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}
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LinesMeasurements ParagraphLayoutManager::measureLines(
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AttributedString const &attributedString,
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ParagraphAttributes const ¶graphAttributes,
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Size size) const {
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return textLayoutManager_->measureLines(
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attributedString, paragraphAttributes, size);
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}
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void ParagraphLayoutManager::setTextLayoutManager(
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std::shared_ptr<TextLayoutManager const> textLayoutManager) const {
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textLayoutManager_ = std::move(textLayoutManager);
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}
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std::shared_ptr<TextLayoutManager const>
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ParagraphLayoutManager::getTextLayoutManager() const {
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return textLayoutManager_;
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}
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std::shared_ptr<void> ParagraphLayoutManager::getHostTextStorage() const {
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return hostTextStorage_;
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}
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} // namespace facebook::react
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