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LibWeb: Avoid unnecessary Vector copying when generating line boxes

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Carry the same Vector<Gfx::DrawGlyphOrEmoji> all the way from the inline
level iterator to the final line box fragment.
This commit is contained in:
Andreas Kling 2024-03-24 16:51:04 +01:00
parent f48024c2d1
commit 9af966f87d
Notes: sideshowbarker 2024-07-17 12:02:22 +09:00
5 changed files with 8 additions and 9 deletions
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7
Userland/Libraries/LibWeb/Layout/LineBox.cpp
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@ -15,7 +15,7 @@
namespace Web::Layout {
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, Span<Gfx::DrawGlyphOrEmoji const> glyph_run)
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, Vector<Gfx::DrawGlyphOrEmoji> glyph_run)
{
bool text_align_is_justify = layout_node.computed_values().text_align() == CSS::TextAlign::Justify;
if (!text_align_is_justify && !m_fragments.is_empty() && &m_fragments.last().layout_node() == &layout_node) {
@ -24,15 +24,14 @@ void LineBox::add_fragment(Node const& layout_node, int start, int length, CSSPi
// Expand the last fragment instead of adding a new one with the same Layout::Node.
m_fragments.last().m_length = (start - m_fragments.last().m_start) + length;
m_fragments.last().set_width(m_fragments.last().width() + content_width);
for (auto glyph : glyph_run) {
for (auto& glyph : glyph_run) {
glyph.visit([&](auto& glyph) { glyph.position.translate_by(fragment_width.to_float(), 0); });
m_fragments.last().m_glyph_run->append(glyph);
}
} else {
Vector<Gfx::DrawGlyphOrEmoji> glyph_run_copy { glyph_run };
CSSPixels x_offset = leading_margin + leading_size + m_width;
CSSPixels y_offset = 0;
m_fragments.append(LineBoxFragment { layout_node, start, length, CSSPixelPoint(x_offset, y_offset), CSSPixelSize(content_width, content_height), border_box_top, move(glyph_run_copy) });
m_fragments.append(LineBoxFragment { layout_node, start, length, CSSPixelPoint(x_offset, y_offset), CSSPixelSize(content_width, content_height), border_box_top, move(glyph_run) });
}
m_width += leading_margin + leading_size + content_width + trailing_size + trailing_margin;
m_height = max(m_height, content_height + border_box_top + border_box_bottom);