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LibWeb: Support <svg> elements with display: block

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There are a couple of things that went into this:

- We now calculate the intrinsic width/height and aspect ratio of <svg>
  elements based on the spec algorithm instead of our previous ad-hoc
  guesswork solution.

- Replaced elements with automatic size and intrinsic aspect ratio but
  no intrinsic dimensions are now sized with the stretch-fit width
  formula.

- We take care to assign both used width and used height to <svg>
  elements before running their SVG formatting contexts. This ensures
  that the inside SVG content is laid out with knowledge of its
  viewport geometry.

- We avoid infinite recursion in tentative_height_for_replaced_element()
  by using the already-calculated used width instead of calling the
  function that calculates the used width (since that may call us right
  back again).
This commit is contained in:
Andreas Kling 2023-05-19 18:14:37 +02:00
parent 28d2e26678
commit f0560fd087
11 changed files with 107 additions and 74 deletions
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3
Userland/Libraries/LibWeb/Layout/FormattingContext.h
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@ -79,6 +79,9 @@ public:
[[nodiscard]] CSSPixels calculate_stretch_fit_width(Box const&, AvailableSize const&) const;
[[nodiscard]] CSSPixels calculate_stretch_fit_height(Box const&, AvailableSize const&) const;
[[nodiscard]] static CSSPixels calculate_stretch_fit_width(Box const&, AvailableSize const&, LayoutState const&);
[[nodiscard]] static CSSPixels calculate_stretch_fit_height(Box const&, AvailableSize const&, LayoutState const&);
virtual bool can_determine_size_of_child() const { return false; }
virtual void determine_width_of_child(Box const&, AvailableSpace const&) { }
virtual void determine_height_of_child(Box const&, AvailableSpace const&) { }