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42d1c9a55b
Profiling showed this area as the most expensive part of ASRangeController propogation of .interfaceState, when scrolling an ASTableView. This is very much on the critical path for sustained 60FPS in these views.
129 lines
3.6 KiB
Objective-C
129 lines
3.6 KiB
Objective-C
//
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// ASInternalHelpers.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 "ASInternalHelpers.h"
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#import <objc/runtime.h>
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#import "ASThread.h"
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#import <tgmath.h>
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BOOL ASSubclassOverridesSelector(Class superclass, Class subclass, SEL selector)
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{
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if (superclass == subclass) return NO; // Even if the class implements the selector, it doesn't override itself.
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Method superclassMethod = class_getInstanceMethod(superclass, selector);
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Method subclassMethod = class_getInstanceMethod(subclass, selector);
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IMP superclassIMP = superclassMethod ? method_getImplementation(superclassMethod) : NULL;
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IMP subclassIMP = subclassMethod ? method_getImplementation(subclassMethod) : NULL;
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return (superclassIMP != subclassIMP);
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}
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BOOL ASSubclassOverridesClassSelector(Class superclass, Class subclass, SEL selector)
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{
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if (superclass == subclass) return NO; // Even if the class implements the selector, it doesn't override itself.
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Method superclassMethod = class_getClassMethod(superclass, selector);
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Method subclassMethod = class_getClassMethod(subclass, selector);
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IMP superclassIMP = superclassMethod ? method_getImplementation(superclassMethod) : NULL;
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IMP subclassIMP = subclassMethod ? method_getImplementation(subclassMethod) : NULL;
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return (superclassIMP != subclassIMP);
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}
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IMP ASReplaceMethodWithBlock(Class c, SEL origSEL, id block)
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{
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NSCParameterAssert(block);
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// Get original method
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Method origMethod = class_getInstanceMethod(c, origSEL);
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NSCParameterAssert(origMethod);
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// Convert block to IMP trampoline and replace method implementation
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IMP newIMP = imp_implementationWithBlock(block);
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// Try adding the method if not yet in the current class
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if (!class_addMethod(c, origSEL, newIMP, method_getTypeEncoding(origMethod))) {
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return method_setImplementation(origMethod, newIMP);
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} else {
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return method_getImplementation(origMethod);
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}
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}
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void ASPerformBlockOnMainThread(void (^block)())
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{
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if (block == nil){
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return;
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}
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if (ASDisplayNodeThreadIsMain()) {
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block();
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} else {
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dispatch_async(dispatch_get_main_queue(), block);
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}
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}
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void ASPerformBlockOnBackgroundThread(void (^block)())
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{
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if (block == nil){
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return;
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}
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if (ASDisplayNodeThreadIsMain()) {
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), block);
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} else {
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block();
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}
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}
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void ASPerformBlockOnDeallocationQueue(void (^block)())
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{
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static dispatch_queue_t queue;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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queue = dispatch_queue_create("org.AsyncDisplayKit.deallocationQueue", DISPATCH_QUEUE_SERIAL);
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});
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dispatch_async(queue, block);
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}
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CGFloat ASScreenScale()
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{
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static CGFloat __scale = 0.0;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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ASDisplayNodeCAssertMainThread();
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__scale = [[UIScreen mainScreen] scale];
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});
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return __scale;
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}
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CGFloat ASFloorPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return floor(f * scale) / scale;
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}
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CGFloat ASCeilPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return ceil(f * scale) / scale;
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}
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CGFloat ASRoundPixelValue(CGFloat f)
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{
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CGFloat scale = ASScreenScale();
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return round(f * scale) / scale;
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}
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@implementation NSIndexPath (ASInverseComparison)
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- (NSComparisonResult)asdk_inverseCompare:(NSIndexPath *)otherIndexPath
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{
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return [otherIndexPath compare:self];
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}
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@end
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