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a255953d34
After 5c9815f, some Mutexes are used as global C++ variables which are loaded before main(). Since the Mutex constructor checks for unfair lock experiment, it triggers an experiment configuration load, and our app isn't ready to respond that early in the process.
85 lines
2.8 KiB
Plaintext
85 lines
2.8 KiB
Plaintext
//
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// ASTextKitContext.mm
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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#import <AsyncDisplayKit/ASTextKitContext.h>
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#if AS_ENABLE_TEXTNODE
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#import <AsyncDisplayKit/ASLayoutManager.h>
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#import <AsyncDisplayKit/ASThread.h>
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#include <memory>
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@implementation ASTextKitContext
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{
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// All TextKit operations (even non-mutative ones) must be executed serially.
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std::shared_ptr<ASDN::Mutex> __instanceLock__;
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NSLayoutManager *_layoutManager;
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NSTextStorage *_textStorage;
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NSTextContainer *_textContainer;
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}
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- (instancetype)initWithAttributedString:(NSAttributedString *)attributedString
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lineBreakMode:(NSLineBreakMode)lineBreakMode
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maximumNumberOfLines:(NSUInteger)maximumNumberOfLines
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exclusionPaths:(NSArray *)exclusionPaths
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constrainedSize:(CGSize)constrainedSize
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{
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if (self = [super init]) {
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static dispatch_once_t onceToken;
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static ASDN::Mutex *mutex;
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dispatch_once(&onceToken, ^{
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mutex = new ASDN::Mutex();
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});
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// Concurrently initialising TextKit components crashes (rdar://18448377) so we use a global lock.
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ASDN::MutexLocker l(*mutex);
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__instanceLock__ = std::make_shared<ASDN::Mutex>();
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// Create the TextKit component stack with our default configuration.
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_textStorage = [[NSTextStorage alloc] init];
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_layoutManager = [[ASLayoutManager alloc] init];
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_layoutManager.usesFontLeading = NO;
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[_textStorage addLayoutManager:_layoutManager];
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// Instead of calling [NSTextStorage initWithAttributedString:], setting attributedString just after calling addlayoutManager can fix CJK language layout issues.
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// See https://github.com/facebook/AsyncDisplayKit/issues/2894
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if (attributedString) {
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[_textStorage setAttributedString:attributedString];
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}
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_textContainer = [[NSTextContainer alloc] initWithSize:constrainedSize];
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// We want the text laid out up to the very edges of the container.
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_textContainer.lineFragmentPadding = 0;
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_textContainer.lineBreakMode = lineBreakMode;
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_textContainer.maximumNumberOfLines = maximumNumberOfLines;
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_textContainer.exclusionPaths = exclusionPaths;
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[_layoutManager addTextContainer:_textContainer];
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}
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return self;
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}
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- (void)performBlockWithLockedTextKitComponents:(NS_NOESCAPE void (^)(NSLayoutManager *,
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NSTextStorage *,
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NSTextContainer *))block
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{
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ASDN::MutexLocker l(*__instanceLock__);
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if (block) {
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block(_layoutManager, _textStorage, _textContainer);
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}
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}
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@end
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#endif
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