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LibWeb: Only perform the requested form of intrinsic size calculation

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Before, querying any of the four intrinsic sizes would cause us to
calculate all of them (the four being min-content width/height, and
max-content width/height).

Now, the helper functions only calculate the specific intrinsic size
requested. It's then cached at the root formatting context level,
so that it's never calculated twice within the same layout pass.
This commit is contained in:
Andreas Kling 2022-07-08 12:44:49 +02:00
parent 496cf39cf5
commit 4f6fc3d3a6
4 changed files with 105 additions and 92 deletions
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9
Userland/Libraries/LibWeb/Layout/FormattingState.h
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@ -102,10 +102,13 @@ struct FormattingState {
// We cache intrinsic sizes once determined, as they will not change over the course of a full layout.
// This avoids computing them several times while performing flex layout.
struct IntrinsicSizes {
Gfx::FloatSize min_content_size;
Gfx::FloatSize max_content_size;
Optional<float> min_content_width;
Optional<float> max_content_width;
Optional<float> min_content_height;
Optional<float> max_content_height;
};
HashMap<NodeWithStyleAndBoxModelMetrics const*, IntrinsicSizes> mutable intrinsic_sizes;
HashMap<NodeWithStyleAndBoxModelMetrics const*, NonnullOwnPtr<IntrinsicSizes>> mutable intrinsic_sizes;
HashMap<Box const*, float> mutable flex_item_size_cache;