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LibWeb: Layout text chunks based on their Unicode direction

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Append text chunks to either the start or end of the text fragment,
depending on the text direction. The direction is determined by what
script its code points are from.
This commit is contained in:
BenJilks 2024-08-18 17:58:05 +01:00 • committed by Andreas Kling
commit 11e7d72686
Notes: github-actions[bot] 2024-08-31 09:50:41 +00:00
18 changed files with 460 additions and 150 deletions
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118
Userland/Libraries/LibWeb/Layout/LineBoxFragment.cpp
View file

@ -12,6 +12,23 @@
namespace Web::Layout {
LineBoxFragment::LineBoxFragment(Node const& layout_node, int start, int length, CSSPixelPoint offset, CSSPixelSize size, CSSPixels border_box_top, CSS::Direction direction, RefPtr<Gfx::GlyphRun> glyph_run)
: m_layout_node(layout_node)
, m_start(start)
, m_length(length)
, m_offset(offset)
, m_size(size)
, m_border_box_top(border_box_top)
, m_direction(direction)
, m_glyph_run(move(glyph_run))
{
if (m_glyph_run) {
m_current_insert_direction = resolve_glyph_run_direction(m_glyph_run->text_type());
if (m_direction == CSS::Direction::Rtl)
m_insert_position = m_size.width().to_float();
}
}
bool LineBoxFragment::ends_in_whitespace() const
{
auto text = this->text();
@ -45,4 +62,105 @@ bool LineBoxFragment::is_atomic_inline() const
return layout_node().is_replaced_box() || (layout_node().display().is_inline_outside() && !layout_node().display().is_flow_inside());
}
CSS::Direction LineBoxFragment::resolve_glyph_run_direction(Gfx::GlyphRun::TextType text_type) const
{
switch (text_type) {
case Gfx::GlyphRun::TextType::Common:
case Gfx::GlyphRun::TextType::ContextDependent:
case Gfx::GlyphRun::TextType::EndPadding:
return m_direction;
case Gfx::GlyphRun::TextType::Ltr:
return CSS::Direction::Ltr;
case Gfx::GlyphRun::TextType::Rtl:
return CSS::Direction::Rtl;
default:
VERIFY_NOT_REACHED();
}
}
void LineBoxFragment::append_glyph_run(RefPtr<Gfx::GlyphRun> const& glyph_run, CSSPixels run_width)
{
switch (m_direction) {
case CSS::Direction::Ltr:
append_glyph_run_ltr(glyph_run, run_width);
break;
case CSS::Direction::Rtl:
append_glyph_run_rtl(glyph_run, run_width);
break;
}
}
void LineBoxFragment::append_glyph_run_ltr(RefPtr<Gfx::GlyphRun> const& glyph_run, CSSPixels run_width)
{
auto run_direction = resolve_glyph_run_direction(glyph_run->text_type());
if (m_current_insert_direction != run_direction) {
if (run_direction == CSS::Direction::Rtl)
m_insert_position = width().to_float();
m_current_insert_direction = run_direction;
}
switch (run_direction) {
case CSS::Direction::Ltr:
for (auto& glyph : glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) { glyph.position.translate_by(width().to_float(), 0); });
m_glyph_run->append(glyph);
}
break;
case CSS::Direction::Rtl:
for (auto& glyph : m_glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) {
if (glyph.position.x() >= m_insert_position)
glyph.position.translate_by(run_width.to_float(), 0);
});
}
for (auto& glyph : glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) { glyph.position.translate_by(m_insert_position, 0); });
m_glyph_run->append(glyph);
}
break;
}
m_size.set_width(width() + run_width);
}
void LineBoxFragment::append_glyph_run_rtl(RefPtr<Gfx::GlyphRun> const& glyph_run, CSSPixels run_width)
{
auto run_direction = resolve_glyph_run_direction(glyph_run->text_type());
if (m_current_insert_direction != run_direction) {
if (run_direction == CSS::Direction::Ltr)
m_insert_position = 0;
m_current_insert_direction = run_direction;
}
switch (run_direction) {
case CSS::Direction::Ltr:
for (auto& glyph : m_glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) {
if (glyph.position.x() >= m_insert_position)
glyph.position.translate_by(run_width.to_float(), 0);
});
}
for (auto& glyph : glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) { glyph.position.translate_by(m_insert_position, 0); });
m_glyph_run->append(glyph);
}
break;
case CSS::Direction::Rtl:
if (glyph_run->text_type() != Gfx::GlyphRun::TextType::EndPadding) {
for (auto& glyph : m_glyph_run->glyphs()) {
glyph.visit([&](auto& glyph) { glyph.position.translate_by(run_width.to_float(), 0); });
}
}
for (auto& glyph : glyph_run->glyphs()) {
m_glyph_run->append(glyph);
}
break;
}
m_size.set_width(width() + run_width);
m_insert_position += run_width.to_float();
}
}