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https://github.com/SerenityOS/serenity
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b01060c7d8
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. (cherry picked from commit 7181c3f2ea5fba73e77d98acbf9e46640b4a9015, minorly amended to fix conflicts caused by: * Our VectorFont not being renamed to Typeface * Us cherry-picking https://github.com/LadybirdBrowser/ladybird/pull/502 first * Us still having bitmap fonts, and hence needing glyph_spacing() Also amended for: * AffineDisplayListPlayerCPU changes * Removing pure virtuals for glyph_id_for_code_point and glyph_id_for_code_point in Font.h again since we still have BitmapFont which can't implement them * Updating more Painter methods that we still had (Painter::draw_glyph_or_emoji(), Painter::draw_text_run()) )
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/*
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* Copyright (c) 2022, 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/Noncopyable.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Layout/InlineNode.h>
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#include <LibWeb/Layout/LayoutState.h>
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#include <LibWeb/Layout/TextNode.h>
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namespace Web::Layout {
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// This class iterates over all the inline-level objects within an inline formatting context.
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// By repeatedly calling next() with the remaining available width on the current line,
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// it returns an "Item" representing the next piece of inline-level content to be placed on the line.
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class InlineLevelIterator {
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AK_MAKE_NONCOPYABLE(InlineLevelIterator);
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AK_MAKE_NONMOVABLE(InlineLevelIterator);
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public:
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struct Item {
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enum class Type {
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Text,
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Element,
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ForcedBreak,
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AbsolutelyPositionedElement,
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FloatingElement,
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};
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Type type {};
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JS::GCPtr<Layout::Node const> node {};
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RefPtr<Gfx::GlyphRun> glyph_run {};
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size_t offset_in_node { 0 };
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size_t length_in_node { 0 };
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CSSPixels width { 0.0f };
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CSSPixels padding_start { 0.0f };
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CSSPixels padding_end { 0.0f };
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CSSPixels border_start { 0.0f };
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CSSPixels border_end { 0.0f };
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CSSPixels margin_start { 0.0f };
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CSSPixels margin_end { 0.0f };
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bool is_collapsible_whitespace { false };
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CSSPixels border_box_width() const
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{
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return border_start + padding_start + width + padding_end + border_end;
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}
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};
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InlineLevelIterator(Layout::InlineFormattingContext&, LayoutState&, Layout::BlockContainer const& containing_block, LayoutState::UsedValues const& containing_block_used_values, LayoutMode);
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Optional<Item> next();
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CSSPixels next_non_whitespace_sequence_width();
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private:
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Optional<Item> next_without_lookahead();
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void skip_to_next();
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void compute_next();
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void enter_text_node(Layout::TextNode const&);
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void enter_node_with_box_model_metrics(Layout::NodeWithStyleAndBoxModelMetrics const&);
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void exit_node_with_box_model_metrics();
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void add_extra_box_model_metrics_to_item(Item&, bool add_leading_metrics, bool add_trailing_metrics);
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Layout::Node const* next_inline_node_in_pre_order(Layout::Node const& current, Layout::Node const* stay_within);
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Layout::InlineFormattingContext& m_inline_formatting_context;
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Layout::LayoutState& m_layout_state;
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JS::NonnullGCPtr<BlockContainer const> m_containing_block;
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LayoutState::UsedValues const& m_containing_block_used_values;
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JS::GCPtr<Layout::Node const> m_current_node;
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JS::GCPtr<Layout::Node const> m_next_node;
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LayoutMode const m_layout_mode;
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struct TextNodeContext {
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bool do_collapse {};
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bool do_wrap_lines {};
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bool do_respect_linebreaks {};
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bool is_first_chunk {};
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bool is_last_chunk {};
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TextNode::ChunkIterator chunk_iterator;
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Optional<TextNode::Chunk> next_chunk {};
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};
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Optional<TextNodeContext> m_text_node_context;
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struct ExtraBoxMetrics {
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CSSPixels margin { 0 };
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CSSPixels border { 0 };
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CSSPixels padding { 0 };
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};
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Optional<ExtraBoxMetrics> m_extra_leading_metrics;
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Optional<ExtraBoxMetrics> m_extra_trailing_metrics;
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Vector<JS::NonnullGCPtr<NodeWithStyleAndBoxModelMetrics const>> m_box_model_node_stack;
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Queue<InlineLevelIterator::Item> m_lookahead_items;
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};
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}
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