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LibWeb: Make the paint tree GC-allocated

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This simplifies the ownership model between DOM/layout/paint nodes
immensely by deferring to the garbage collector for figuring out what's
live and what's not.
This commit is contained in:
Andreas Kling 2023-01-11 12:51:49 +01:00
parent 35ba13802d
commit 4d401bf796
64 changed files with 148 additions and 108 deletions
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25
Userland/Libraries/LibWeb/Painting/Paintable.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -28,7 +28,7 @@ enum class PaintPhase {
};
struct HitTestResult {
NonnullRefPtr<Painting::Paintable> paintable;
JS::Handle<Painting::Paintable> paintable;
int index_in_node { 0 };
enum InternalPosition {
@ -48,9 +48,8 @@ enum class HitTestType {
TextCursor, // Clicking past the right/bottom edge of text will still hit the text
};
class Paintable : public RefCounted<Paintable> {
AK_MAKE_NONMOVABLE(Paintable);
AK_MAKE_NONCOPYABLE(Paintable);
class Paintable : public JS::Cell {
JS_CELL(Paintable, Cell);
public:
virtual ~Paintable() = default;
@ -108,24 +107,24 @@ public:
virtual bool handle_mousewheel(Badge<EventHandler>, CSSPixelPoint, unsigned buttons, unsigned modifiers, int wheel_delta_x, int wheel_delta_y);
Layout::Node const& layout_node() const { return m_layout_node; }
Layout::Node& layout_node() { return const_cast<Layout::Node&>(m_layout_node); }
Layout::Node& layout_node() { return const_cast<Layout::Node&>(*m_layout_node); }
DOM::Node* dom_node() { return layout_node().dom_node(); }
DOM::Node const* dom_node() const { return layout_node().dom_node(); }
auto const& computed_values() const { return m_layout_node.computed_values(); }
auto const& computed_values() const { return m_layout_node->computed_values(); }
bool visible_for_hit_testing() const { return computed_values().pointer_events() != CSS::PointerEvents::None; }
HTML::BrowsingContext const& browsing_context() const { return m_layout_node.browsing_context(); }
HTML::BrowsingContext const& browsing_context() const { return m_layout_node->browsing_context(); }
HTML::BrowsingContext& browsing_context() { return layout_node().browsing_context(); }
void set_needs_display() const { const_cast<Layout::Node&>(m_layout_node).set_needs_display(); }
void set_needs_display() const { const_cast<Layout::Node&>(*m_layout_node).set_needs_display(); }
Layout::BlockContainer const* containing_block() const
{
if (!m_containing_block.has_value())
m_containing_block = const_cast<Layout::Node&>(m_layout_node).containing_block();
m_containing_block = m_layout_node->containing_block();
return *m_containing_block;
}
@ -138,8 +137,10 @@ protected:
{
}
virtual void visit_edges(Cell::Visitor&) override;
private:
Layout::Node const& m_layout_node;
JS::NonnullGCPtr<Layout::Node> m_layout_node;
Optional<Layout::BlockContainer*> mutable m_containing_block;
};
@ -154,6 +155,6 @@ inline DOM::Node const* HitTestResult::dom_node() const
}
template<>
inline bool Paintable::fast_is<PaintableBox>() const { return m_layout_node.is_box(); }
inline bool Paintable::fast_is<PaintableBox>() const { return m_layout_node->is_box(); }
}