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https://github.com/Swiftgram/Telegram-iOS.git
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bf9c142765
This reverts commit 6238e5edbde55fb82982ce4a19a0cbca7fe7eb9d. We will re-apply this change, but there are some early signs of performance impacts that need to be investigated.
82 lines
3.1 KiB
Plaintext
Executable File
82 lines
3.1 KiB
Plaintext
Executable File
//
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// ASTextKitContext.mm
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// AsyncDisplayKit
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//
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// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under the BSD-style license found in the
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// LICENSE file in the root directory of this source tree. An additional grant
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// of patent rights can be found in the PATENTS file in the same directory.
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//
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#import "ASTextKitContext.h"
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#import "ASLayoutManager.h"
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#import <mutex>
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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::mutex _textKitMutex;
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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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layoutManagerCreationBlock:(NSLayoutManager * (^)(void))layoutCreationBlock
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layoutManagerDelegate:(id<NSLayoutManagerDelegate>)layoutManagerDelegate
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textStorageCreationBlock:(NSTextStorage * (^)(NSAttributedString *attributedString))textStorageCreationBlock
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{
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if (self = [super init]) {
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// Concurrently initialising TextKit components crashes (rdar://18448377) so we use a global lock.
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static std::mutex __static_mutex;
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std::lock_guard<std::mutex> l(__static_mutex);
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// Create the TextKit component stack with our default configuration.
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if (textStorageCreationBlock) {
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_textStorage = textStorageCreationBlock(attributedString);
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} else {
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_textStorage = (attributedString ? [[NSTextStorage alloc] initWithAttributedString:attributedString] : [[NSTextStorage alloc] init]);
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}
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_layoutManager = layoutCreationBlock ? layoutCreationBlock() : [[ASLayoutManager alloc] init];
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_layoutManager.usesFontLeading = NO;
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_layoutManager.delegate = layoutManagerDelegate;
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[_textStorage addLayoutManager:_layoutManager];
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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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- (CGSize)constrainedSize
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{
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std::lock_guard<std::mutex> l(_textKitMutex);
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return _textContainer.size;
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}
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- (void)setConstrainedSize:(CGSize)constrainedSize
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{
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std::lock_guard<std::mutex> l(_textKitMutex);
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_textContainer.size = constrainedSize;
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}
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- (void)performBlockWithLockedTextKitComponents:(void (^)(NSLayoutManager *,
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NSTextStorage *,
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NSTextContainer *))block
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{
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std::lock_guard<std::mutex> l(_textKitMutex);
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block(_layoutManager, _textStorage, _textContainer);
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}
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@end
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