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Used hasDirtyChildren tag for the optimization

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Summary:
More fine grained dirty marking

Currently a node's dirty flag propagates to the root of the tree ensuring that when any node is invalidated its whole subtree will be re-calculated. This is often times not needed. There are many properties which only effects a node's children and would not need to propagate all the way to the root such as align-items. Also in cases where the style does change layout it may not need to propagate all the way to the root but can often stop at the nearest position: absolute parent.

This change has the potential of greatly improving performance of re-calculating a tree.

This might require adding a second dirty flag named hasDirtyDescendants ensuring that traversal still works even though a parent is not marked as dirty.

Reviewed By: emilsjolander

Differential Revision: D6134754

fbshipit-source-id: bbcfee14058140b946401de756a3f130de0f51cd
This commit is contained in:
Pritesh Nandgaonkar
2017-10-31 08:04:04 -07:00
committed by Facebook Github Bot
parent 132b016bae
commit c5182c4bf5
5 changed files with 101 additions and 7 deletions
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yoga/Yoga.h
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@@ -101,6 +101,7 @@ WIN_EXPORT void YGNodeCalculateLayout(const YGNodeRef node,
// marking manually.
WIN_EXPORT void YGNodeMarkDirty(const YGNodeRef node);
WIN_EXPORT bool YGNodeIsDirty(const YGNodeRef node);
WIN_EXPORT bool YGNodeHasDirtyDescendants(const YGNodeRef node);
WIN_EXPORT void YGNodePrint(const YGNodeRef node, const YGPrintOptions options);