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Make yoga & layout specs faster by eliminating some copies (#1128)

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This commit is contained in:
Adlai Holler
2018-09-18 07:26:29 -07:00
committed by Huy Nguyen
parent 47e2b9c0de
commit d2984ced8d
7 changed files with 39 additions and 22 deletions
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9
Source/Layout/ASBackgroundLayoutSpec.mm
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@@ -12,6 +12,7 @@
#import <AsyncDisplayKit/ASLayoutSpec+Subclasses.h>
#import <AsyncDisplayKit/ASAssert.h>
#import <AsyncDisplayKit/ASCollections.h>
static NSUInteger const kForegroundChildIndex = 0;
static NSUInteger const kBackgroundChildIndex = 1;
@@ -48,17 +49,19 @@ static NSUInteger const kBackgroundChildIndex = 1;
{
ASLayout *contentsLayout = [self.child layoutThatFits:constrainedSize parentSize:parentSize];
NSMutableArray *sublayouts = [NSMutableArray arrayWithCapacity:2];
ASLayout *rawSublayouts[2];
int i = 0;
if (self.background) {
// Size background to exactly the same size.
ASLayout *backgroundLayout = [self.background layoutThatFits:ASSizeRangeMake(contentsLayout.size)
parentSize:parentSize];
backgroundLayout.position = CGPointZero;
[sublayouts addObject:backgroundLayout];
rawSublayouts[i++] = backgroundLayout;
}
contentsLayout.position = CGPointZero;
[sublayouts addObject:contentsLayout];
rawSublayouts[i++] = contentsLayout;
let sublayouts = [NSArray<ASLayout *> arrayByTransferring:rawSublayouts count:i];
return [ASLayout layoutWithLayoutElement:self size:contentsLayout.size sublayouts:sublayouts];
}