mirror of
https://github.com/LadybirdBrowser/ladybird
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3012c0fe72
Replace per-frame heap-allocated RefCounted ScrollFrame objects with a single contiguous Vector<ScrollFrame> inside ScrollState. All frames for a viewport are now stored in one allocation, using type-safe ScrollFrameIndex instead of RefPtr pointers. This reduces allocation churn, improves cache locality, and moves parent-chain traversal (cumulative offset, nearest scrolling ancestor) into ScrollState — similar to how visual context nodes were recently consolidated into AccumulatedVisualContextTree.
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/DistinctNumeric.h>
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#include <LibGC/Weak.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/PixelUnits.h>
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namespace Web::Painting {
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AK_TYPEDEF_DISTINCT_ORDERED_ID(size_t, ScrollFrameIndex);
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struct StickyInsets {
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Optional<CSSPixels> top;
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Optional<CSSPixels> right;
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Optional<CSSPixels> bottom;
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Optional<CSSPixels> left;
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};
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struct StickyConstraints {
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CSSPixelPoint position_relative_to_scroll_ancestor;
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CSSPixelSize border_box_size;
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CSSPixelSize scrollport_size;
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CSSPixelRect containing_block_region;
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bool needs_parent_offset_adjustment { false };
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StickyInsets insets;
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};
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class ScrollFrame {
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public:
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ScrollFrame() = default;
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ScrollFrame(PaintableBox const& paintable_box, bool sticky, ScrollFrameIndex parent_index);
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PaintableBox const& paintable_box() const { return *m_paintable_box; }
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bool is_sticky() const { return m_sticky; }
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CSSPixelPoint own_offset() const { return m_own_offset; }
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void set_own_offset(CSSPixelPoint offset)
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{
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m_own_offset = offset;
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}
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ScrollFrameIndex parent_index() const { return m_parent_index; }
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void set_sticky_constraints(StickyConstraints constraints) { m_sticky_constraints = constraints; }
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bool has_sticky_constraints() const { return m_sticky_constraints.has_value(); }
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StickyConstraints const& sticky_constraints() const { return m_sticky_constraints.value(); }
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private:
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friend class ScrollState;
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friend class ScrollStateSnapshot;
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GC::Weak<PaintableBox> m_paintable_box;
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bool m_sticky { false };
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ScrollFrameIndex m_parent_index;
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CSSPixelPoint m_own_offset;
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Optional<StickyConstraints> m_sticky_constraints;
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};
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}
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