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LibWeb: Handle reference cycles in SVG gradient linking

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Since SVG gradients can reference each other, we have to keep track of
visited gradients when traversing the link chain, or we will recurse
infinitely when there's a reference cycle.
This commit is contained in:
Andreas Kling 2024-03-10 12:18:09 +01:00
parent 1b8d8c7bbc
commit 2e0297d703
8 changed files with 155 additions and 36 deletions
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9
Userland/Libraries/LibWeb/SVG/SVGLinearGradientElement.h
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@ -34,9 +34,9 @@ protected:
virtual void initialize(JS::Realm&) override;
private:
JS::GCPtr<SVGLinearGradientElement const> linked_linear_gradient() const
JS::GCPtr<SVGLinearGradientElement const> linked_linear_gradient(HashTable<SVGGradientElement const*>& seen_gradients) const
{
if (auto gradient = linked_gradient(); gradient && is<SVGLinearGradientElement>(*gradient))
if (auto gradient = linked_gradient(seen_gradients); gradient && is<SVGLinearGradientElement>(*gradient))
return &verify_cast<SVGLinearGradientElement>(*gradient);
return {};
}
@ -46,6 +46,11 @@ private:
NumberPercentage end_x() const;
NumberPercentage end_y() const;
NumberPercentage start_x_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
NumberPercentage start_y_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
NumberPercentage end_x_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
NumberPercentage end_y_impl(HashTable<SVGGradientElement const*>& seen_gradients) const;
Optional<NumberPercentage> m_x1;
Optional<NumberPercentage> m_y1;
Optional<NumberPercentage> m_x2;