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https://github.com/LadybirdBrowser/ladybird
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568b7ce7ea
The Paintable tree and its supplemental painting data structures were GC allocated because that was the easiest way to manage it and avoid leaks introduced by ref cycles. This included the Paintable subclasses themselves plus StackingContext, ChromeWidget, Scrollbar, ResizeHandle, and scroll-frame state. We are now trying to reduce GC allocation churn on layout and painting updates, so keeping this short-lived rendering tree outside the JS heap is a better fit. Move Paintable to RefCountedTreeNode, make painting helpers ref-counted or weakly reference Paintables, and update the layout and event-handler call sites to use RefPtr/WeakPtr ownership.
102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
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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/Utf16String.h>
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#include <AK/Utf16View.h>
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#include <LibGfx/TextLayout.h>
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#include <LibUnicode/Segmenter.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Layout/Node.h>
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namespace Web::Layout {
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class LineBoxFragment;
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class TextNode final : public Node {
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GC_CELL(TextNode, Node);
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GC_DECLARE_ALLOCATOR(TextNode);
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public:
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TextNode(DOM::Document&, DOM::Text&);
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virtual ~TextNode() override;
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DOM::Text const& dom_node() const { return static_cast<DOM::Text const&>(*Node::dom_node()); }
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Utf16String const& text_for_rendering() const;
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struct Chunk {
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Utf16View view;
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NonnullRefPtr<Gfx::Font const> font;
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size_t start { 0 };
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size_t length { 0 };
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bool has_breaking_newline { false };
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bool has_breaking_tab { false };
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bool is_all_whitespace { false };
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bool can_break_after { false };
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Gfx::GlyphRun::TextType text_type;
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};
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class ChunkIterator {
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public:
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ChunkIterator(TextNode const&, bool should_wrap_lines, bool should_respect_linebreaks);
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ChunkIterator(TextNode const&, Utf16View const&, Unicode::Segmenter& grapheme_segmenter, Unicode::Segmenter& line_segmenter, CSS::WordBreak, bool should_wrap_lines, bool should_respect_linebreaks);
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bool should_wrap_lines() const { return m_should_wrap_lines; }
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bool should_respect_linebreaks() const { return m_should_respect_linebreaks; }
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bool should_collapse_whitespace() const { return m_should_collapse_whitespace; }
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Optional<Chunk> next();
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Optional<Chunk> peek(size_t);
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Chunk create_empty_chunk();
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private:
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Optional<Chunk> next_without_peek();
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Optional<Chunk> try_commit_chunk(size_t start, size_t end, bool has_breaking_newline, bool has_breaking_tab, bool can_break_after, Gfx::Font const&, Gfx::GlyphRun::TextType) const;
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[[nodiscard]] bool is_at_line_break_opportunity() const;
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[[nodiscard]] Gfx::Font const& font_for_space(size_t at_index, u32 space_code_point) const;
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bool const m_should_wrap_lines;
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bool const m_should_respect_linebreaks;
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bool m_should_collapse_whitespace;
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Utf16View m_view;
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Gfx::FontCascadeList const& m_font_cascade_list;
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Unicode::Segmenter& m_grapheme_segmenter;
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Unicode::Segmenter& m_line_segmenter;
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CSS::WordBreak m_word_break;
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size_t m_current_index { 0 };
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Vector<Chunk> m_peek_queue;
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mutable RefPtr<Gfx::Font const> m_last_non_whitespace_font;
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};
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void invalidate_text_for_rendering();
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Unicode::Segmenter& grapheme_segmenter() const;
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Unicode::Segmenter& line_segmenter() const;
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virtual RefPtr<Painting::Paintable> create_paintable() const override;
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private:
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virtual bool is_text_node() const final { return true; }
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void compute_text_for_rendering();
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Optional<Utf16String> m_text_for_rendering;
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mutable OwnPtr<Unicode::Segmenter> m_grapheme_segmenter;
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mutable OwnPtr<Unicode::Segmenter> m_line_segmenter;
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};
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template<>
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inline bool Node::fast_is<TextNode>() const { return is_text_node(); }
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}
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