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Code Issues Activity Actions

LibWeb: Use coordinate instead of WeakPtr for box->fragment connection

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Using WeakPtr to remember which LineBoxFragment owns which Box was
imposing some annoying constraints on the layout code. Importantly, it
was forcing us to heap-allocate fragments, which makes it much harder to
clone a FormattingState.

This patch replaces the WeakPtr with a coordinate system instead.
Fragments are referred to by their line box index + fragment index
within the line box.
This commit is contained in:
Andreas Kling 2022-02-27 10:26:38 +01:00
parent 726edd2d3b
commit 16a47165ee
5 changed files with 21 additions and 14 deletions
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8
Userland/Libraries/LibWeb/Layout/Box.h
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@ -82,7 +82,11 @@ public:
bool is_body() const;
void set_containing_line_box_fragment(LineBoxFragment&);
struct LineBoxFragmentCoordinate {
size_t line_box_index { 0 };
size_t fragment_index { 0 };
};
void set_containing_line_box_fragment(LineBoxFragmentCoordinate);
StackingContext* stacking_context() { return m_stacking_context; }
const StackingContext* stacking_context() const { return m_stacking_context; }
@ -138,7 +142,7 @@ private:
Gfx::FloatSize m_content_size;
// Some boxes hang off of line box fragments. (inline-block, inline-table, replaced, etc)
WeakPtr<LineBoxFragment> m_containing_line_box_fragment;
Optional<LineBoxFragmentCoordinate> m_containing_line_box_fragment;
OwnPtr<StackingContext> m_stacking_context;