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7181c3f2ea
The ChunkIterator now limits a chunk to using only one font (before, it was possible to have a chunk with >1 font, when `unicode-range` CSS property is used). This change allows us to reduce some complexity in the text shaping and painting code and makes us compatible with the APIs in Skia and HarfBuzz.
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.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/Utf8View.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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JS_CELL(TextNode, Node);
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JS_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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const DOM::Text& dom_node() const { return static_cast<const DOM::Text&>(*Node::dom_node()); }
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String const& text_for_rendering() const;
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struct Chunk {
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Utf8View view;
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NonnullRefPtr<Gfx::Font> 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 is_all_whitespace { false };
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};
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class ChunkIterator {
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public:
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ChunkIterator(StringView text, bool wrap_lines, bool respect_linebreaks, Gfx::FontCascadeList const&);
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Optional<Chunk> next();
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private:
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Optional<Chunk> try_commit_chunk(Utf8View::Iterator const& start, Utf8View::Iterator const& end, bool has_breaking_newline, Gfx::Font const&) const;
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bool const m_wrap_lines;
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bool const m_respect_linebreaks;
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Utf8View m_utf8_view;
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Utf8View::Iterator m_iterator;
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Gfx::FontCascadeList const& m_font_cascade_list;
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};
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void invalidate_text_for_rendering();
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void compute_text_for_rendering();
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virtual JS::GCPtr<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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Optional<String> m_text_for_rendering;
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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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