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[ASStackLayoutSpec] Micro-optimizations to ultrahot codepaths, reducing both locking overhead and method calls.

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This commit is contained in:
Scott Goodson 2016-02-20 17:50:19 -08:00
parent d899f12f70
commit 4637bf6a37
1 changed files with 16 additions and 9 deletions
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25
AsyncDisplayKit/Private/ASStackUnpositionedLayout.mm
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@ -76,16 +76,19 @@ static void stretchChildrenAlongCrossDimension(std::vector<ASStackUnpositionedIt
const CGFloat childCrossMax = it == layouts.end() ? 0 : crossDimension(style.direction, it->layout.size);
for (auto &l : layouts) {
const ASStackLayoutAlignItems alignItems = alignment(l.child.alignSelf, style.alignItems);
const id<ASLayoutable> child = l.child;
const CGSize size = l.layout.size;
const ASStackLayoutAlignItems alignItems = alignment(child.alignSelf, style.alignItems);
const CGFloat cross = crossDimension(style.direction, l.layout.size);
const CGFloat stack = stackDimension(style.direction, l.layout.size);
const CGFloat cross = crossDimension(style.direction, size);
const CGFloat stack = stackDimension(style.direction, size);
// restretch all stretchable children along the cross axis using the new min. set their max size to childCrossMax,
// not crossMax, so that if any of them would choose a larger size just because the min size increased (weird!)
// they are forced to choose the same width as all the other children.
if (alignItems == ASStackLayoutAlignItemsStretch && fabs(cross - childCrossMax) > 0.01) {
l.layout = crossChildLayout(l.child, style, stack, stack, childCrossMax, childCrossMax);
l.layout = crossChildLayout(child, style, stack, stack, childCrossMax, childCrossMax);
}
}
}
@ -112,7 +115,9 @@ static CGFloat computeStackDimensionSum(const std::vector<ASStackUnpositionedIte
// Start from default spacing between each child:
children.empty() ? 0 : style.spacing * (children.size() - 1),
[&](CGFloat x, const ASStackUnpositionedItem &l) {
return x + l.child.spacingBefore + l.child.spacingAfter;
const id<ASLayoutable> child = l.child;
const ASLayoutOptions *layoutOptions = child.layoutOptions;
return x + layoutOptions.spacingBefore + layoutOptions.spacingAfter;
});
// Sum up the childrens' dimensions (including spacing) in the stack direction.
@ -215,8 +220,9 @@ static void layoutFlexibleChildrenAtZeroSize(std::vector<ASStackUnpositionedItem
const ASSizeRange &sizeRange)
{
for (ASStackUnpositionedItem &item : items) {
if (isFlexibleInBothDirections(item.child)) {
item.layout = crossChildLayout(item.child,
const id<ASLayoutable> child = item.child;
if (isFlexibleInBothDirections(child)) {
item.layout = crossChildLayout(child,
style,
0,
0,
@ -294,8 +300,9 @@ static std::vector<ASStackUnpositionedItem> layoutChildrenAlongUnconstrainedStac
const CGFloat maxCrossDimension = crossDimension(style.direction, sizeRange.max);
return AS::map(children, [&](id<ASLayoutable> child) -> ASStackUnpositionedItem {
const BOOL isUnconstrainedFlexBasis = ASRelativeDimensionEqualToRelativeDimension(ASRelativeDimensionUnconstrained, child.flexBasis);
const CGFloat exactStackDimension = ASRelativeDimensionResolve(child.flexBasis, stackDimension(style.direction, size));
const ASRelativeDimension flexBasis = child.flexBasis;
const BOOL isUnconstrainedFlexBasis = ASRelativeDimensionEqualToRelativeDimension(ASRelativeDimensionUnconstrained, flexBasis);
const CGFloat exactStackDimension = ASRelativeDimensionResolve(flexBasis, stackDimension(style.direction, size));
if (useOptimizedFlexing && isFlexibleInBothDirections(child)) {
return { child, [ASLayout layoutWithLayoutableObject:child size:{0, 0}] };