Fix per-node memory regression caused by Grid styles - #2018
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intergalacticspacehighway wants to merge 2 commits into
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Fix per-node memory regression caused by Grid styles#2018intergalacticspacehighway wants to merge 2 commits into
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Style is held by value in every node. An empty std::vector still costs its three pointers, so the four grid track lists take 96 bytes even on a node with no tracks. Grid style now sits behind one pointer which stays null until a grid property is set. sizeof(Style): 280 -> 160.
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Why
Currently, grid style properties are stored in yoga style (
gridTemplateRows_,gridAutoColumns_etc). These properties increase the size of style object from152bytes to280bytes (84% increase). The cost is added even when a node is not a grid container or a grid item.How
Move grid style properties behind a pointer that is lazily allocated, on the first grid property set. A node that doesn't use grid only adds the cost of this pointer (8 bytes). So style now costs 160 bytes (5% increase). The public API remains unchanged.
Tests
A test is added to catch the style size regression and
tests/GridStyleTest.cppincludes additional cases to assert unset style, copy and move behaviour.