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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.
88 lines
3.7 KiB
C++
88 lines
3.7 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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#include <AK/CharacterTypes.h>
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#include <AK/TypeCasts.h>
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#include <AK/Utf8View.h>
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#include <LibWeb/Layout/Box.h>
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#include <LibWeb/Layout/BreakNode.h>
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#include <LibWeb/Layout/LineBox.h>
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#include <LibWeb/Layout/Node.h>
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#include <LibWeb/Layout/TextNode.h>
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namespace Web::Layout {
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void LineBox::add_fragment(Node const& layout_node, int start, int length, CSSPixels leading_size, CSSPixels trailing_size, CSSPixels leading_margin, CSSPixels trailing_margin, CSSPixels content_width, CSSPixels content_height, CSSPixels border_box_top, CSSPixels border_box_bottom, RefPtr<Gfx::GlyphRun> glyph_run)
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{
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bool text_align_is_justify = layout_node.computed_values().text_align() == CSS::TextAlign::Justify;
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if (glyph_run && !text_align_is_justify && !m_fragments.is_empty() && &m_fragments.last().layout_node() == &layout_node && &m_fragments.last().m_glyph_run->font() == &glyph_run->font()) {
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auto const fragment_width = m_fragments.last().width();
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// The fragment we're adding is from the last Layout::Node on the line.
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// Expand the last fragment instead of adding a new one with the same Layout::Node.
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m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
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m_fragments.last().set_width(m_fragments.last().width() + content_width);
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for (auto& glyph : glyph_run->glyphs()) {
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glyph.visit([&](auto& glyph) { glyph.position.translate_by(fragment_width.to_float(), 0); });
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m_fragments.last().m_glyph_run->append(glyph);
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}
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} else {
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CSSPixels x_offset = leading_margin + leading_size + m_width;
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CSSPixels y_offset = 0;
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m_fragments.append(LineBoxFragment { layout_node, start, length, CSSPixelPoint(x_offset, y_offset), CSSPixelSize(content_width, content_height), border_box_top, move(glyph_run) });
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}
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m_width += leading_margin + leading_size + content_width + trailing_size + trailing_margin;
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m_height = max(m_height, content_height + border_box_top + border_box_bottom);
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}
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void LineBox::trim_trailing_whitespace()
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{
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auto should_trim = [](LineBoxFragment* fragment) {
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auto ws = fragment->layout_node().computed_values().white_space();
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return ws == CSS::WhiteSpace::Normal || ws == CSS::WhiteSpace::Nowrap || ws == CSS::WhiteSpace::PreLine;
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};
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LineBoxFragment* last_fragment = nullptr;
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for (;;) {
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if (m_fragments.is_empty())
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return;
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// last_fragment cannot be null from here on down, as m_fragments is not empty.
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last_fragment = &m_fragments.last();
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if (!should_trim(last_fragment))
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return;
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if (last_fragment->is_justifiable_whitespace()) {
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m_width -= last_fragment->width();
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m_fragments.remove(m_fragments.size() - 1);
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} else {
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break;
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}
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}
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auto last_text = last_fragment->text();
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if (last_text.is_null())
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return;
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while (last_fragment->length()) {
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auto last_character = last_text[last_fragment->length() - 1];
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if (!is_ascii_space(last_character))
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break;
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// FIXME: Use fragment's glyph run to determine the width of the last character.
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int last_character_width = last_fragment->layout_node().first_available_font().glyph_width(last_character);
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last_fragment->m_length -= 1;
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last_fragment->set_width(last_fragment->width() - last_character_width);
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m_width -= last_character_width;
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}
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}
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bool LineBox::is_empty_or_ends_in_whitespace() const
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{
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if (m_fragments.is_empty())
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return true;
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return m_fragments.last().ends_in_whitespace();
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}
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}
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