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LibWeb: Allocate CSS::ComputedValues objects on the heap

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This makes them cheap to move around, since we can store them in a
NonnullOwnPtr instead of memcopying 2584(!) bytes.

Drastically reduces the chance of stack overflow while building the
layout tree for deeply nested DOMs (since tree building was putting
these things on the stack).

This change also exposed a completely unnecessary ComputedValues deep
copy in block layout.
This commit is contained in:
Andreas Kling
2024-01-27 08:38:27 +01:00
parent d89e42902e
commit ad7e6878fe
11 changed files with 40 additions and 33 deletions
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18
Userland/Libraries/LibWeb/Layout/TreeBuilder.cpp
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@@ -411,7 +411,7 @@ ErrorOr<void> TreeBuilder::create_layout_tree(DOM::Node& dom_node, TreeBuilder::
// If the box does not overflow in the vertical axis, then it is centered vertically.
// FIXME: Only apply alignment when box overflows
auto flex_computed_values = parent.computed_values().clone_inherited_values();
auto& mutable_flex_computed_values = static_cast<CSS::MutableComputedValues&>(flex_computed_values);
auto& mutable_flex_computed_values = static_cast<CSS::MutableComputedValues&>(*flex_computed_values);
mutable_flex_computed_values.set_display(CSS::Display { CSS::DisplayOutside::Block, CSS::DisplayInside::Flex });
mutable_flex_computed_values.set_justify_content(CSS::JustifyContent::Center);
mutable_flex_computed_values.set_flex_direction(CSS::FlexDirection::Column);
@@ -613,7 +613,7 @@ static void wrap_in_anonymous(Vector<JS::Handle<Node>>& sequence, Node* nearest_
VERIFY(!sequence.is_empty());
auto& parent = *sequence.first()->parent();
auto computed_values = parent.computed_values().clone_inherited_values();
static_cast<CSS::MutableComputedValues&>(computed_values).set_display(display);
static_cast<CSS::MutableComputedValues&>(*computed_values).set_display(display);
auto wrapper = parent.heap().template allocate_without_realm<WrapperBoxType>(parent.document(), nullptr, move(computed_values));
for (auto& child : sequence) {
parent.remove_child(*child);
@@ -699,8 +699,8 @@ Vector<JS::Handle<Box>> TreeBuilder::generate_missing_parents(NodeWithStyle& roo
auto* nearest_sibling = table_box->next_sibling();
auto& parent = *table_box->parent();
CSS::ComputedValues wrapper_computed_values = table_box->computed_values().clone_inherited_values();
table_box->transfer_table_box_computed_values_to_wrapper_computed_values(wrapper_computed_values);
auto wrapper_computed_values = table_box->computed_values().clone_inherited_values();
table_box->transfer_table_box_computed_values_to_wrapper_computed_values(*wrapper_computed_values);
auto wrapper = parent.heap().allocate_without_realm<TableWrapper>(parent.document(), nullptr, move(wrapper_computed_values));
@@ -731,12 +731,12 @@ static void fixup_row(Box& row_box, TableGrid const& table_grid, size_t row_inde
if (table_grid.occupancy_grid().contains({ column_index, row_index }))
continue;
auto row_computed_values = row_box.computed_values().clone_inherited_values();
auto& cell_computed_values = static_cast<CSS::MutableComputedValues&>(row_computed_values);
cell_computed_values.set_display(Web::CSS::Display { CSS::DisplayInternal::TableCell });
auto computed_values = row_box.computed_values().clone_inherited_values();
auto& mutable_computed_values = static_cast<CSS::MutableComputedValues&>(*computed_values);
mutable_computed_values.set_display(Web::CSS::Display { CSS::DisplayInternal::TableCell });
// Ensure that the cell (with zero content height) will have the same height as the row by setting vertical-align to middle.
cell_computed_values.set_vertical_align(CSS::VerticalAlign::Middle);
auto cell_box = row_box.heap().template allocate_without_realm<BlockContainer>(row_box.document(), nullptr, cell_computed_values);
mutable_computed_values.set_vertical_align(CSS::VerticalAlign::Middle);
auto cell_box = row_box.heap().template allocate_without_realm<BlockContainer>(row_box.document(), nullptr, move(computed_values));
row_box.append_child(cell_box);
}
}