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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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5
java/jni/YGJNI.cpp
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@@ -249,6 +249,10 @@ jboolean jni_YGNodeIsDirty(alias_ref<jobject>, jlong nativePointer) {
return (jboolean) YGNodeIsDirty(_jlong2YGNodeRef(nativePointer));
}
jboolean jni_YGNodeHasDirtyDescendants(alias_ref<jobject>, jlong nativePointer) {
return (jboolean) YGNodeHasDirtyDescendants(_jlong2YGNodeRef(nativePointer));
}
void jni_YGNodeSetHasMeasureFunc(alias_ref<jobject>, jlong nativePointer, jboolean hasMeasureFunc) {
YGNodeSetMeasureFunc(_jlong2YGNodeRef(nativePointer), hasMeasureFunc ? YGJNIMeasureFunc : NULL);
}
@@ -453,6 +457,7 @@ jint JNI_OnLoad(JavaVM *vm, void *) {
YGMakeNativeMethod(jni_YGNodeCalculateLayout),
YGMakeNativeMethod(jni_YGNodeMarkDirty),
YGMakeNativeMethod(jni_YGNodeIsDirty),
YGMakeNativeMethod(jni_YGNodeHasDirtyDescendants),
YGMakeNativeMethod(jni_YGNodeSetHasMeasureFunc),
YGMakeNativeMethod(jni_YGNodeSetHasBaselineFunc),
YGMakeNativeMethod(jni_YGNodeCopyStyle),