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LibWeb: Consider margins of atomic inlines in layout

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According to CSS Inline Layout Module Level 3 § 2.2 Step 1. atomic
inlines should be layed out in a line box based on their margin box.

However, up until this patch we were unconditionally considering only
the border box during line box height calculation. This made us
essentially drop all vertical margins for atomic inlines.
This commit is contained in:
Mathis Wiehl 2023-03-14 10:28:01 +01:00 • committed by Andreas Kling
parent 0aa4466ce9
commit b96920a9d6
11 changed files with 98 additions and 8 deletions
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6
Userland/Libraries/LibWeb/Layout/LayoutState.cpp
View file

@ -110,7 +110,7 @@ CSSPixels box_baseline(LayoutState const& state, Box const& box)
return box_state.border_box_top();
case CSS::VerticalAlign::Bottom:
// Bottom: Align the bottom of the aligned subtree with the bottom of the line box.
return box_state.content_height() + box_state.border_box_bottom();
return box_state.content_height() + box_state.margin_box_top();
case CSS::VerticalAlign::TextTop:
// TextTop: Align the top of the box with the top of the parent's content area (see 10.6.1).
return box.computed_values().font_size();
@ -123,13 +123,13 @@ CSSPixels box_baseline(LayoutState const& state, Box const& box)
}
if (!box_state.line_boxes.is_empty())
return box_state.border_box_top() + box_state.offset.y() + box_state.line_boxes.last().baseline();
return box_state.margin_box_top() + box_state.offset.y() + box_state.line_boxes.last().baseline();
if (box.has_children() && !box.children_are_inline()) {
auto const* child_box = box.last_child_of_type<Box>();
VERIFY(child_box);
return box_baseline(state, *child_box);
}
return box_state.border_box_height();
return box_state.margin_box_height();
}
CSSPixelRect margin_box_rect(Box const& box, LayoutState const& state)

5
Userland/Libraries/LibWeb/Layout/LineBoxFragment.cpp
View file

@ -149,4 +149,9 @@ CSSPixelRect LineBoxFragment::selection_rect(Gfx::Font const& font) const
return {};
}
bool LineBoxFragment::is_atomic_inline() const
{
return layout_node().is_replaced_box() || (layout_node().display().is_inline_outside() && !layout_node().display().is_flow_inside());
}
}

2
Userland/Libraries/LibWeb/Layout/LineBoxFragment.h
View file

@ -76,6 +76,8 @@ public:
CSSPixelRect selection_rect(Gfx::Font const&) const;
bool is_atomic_inline() const;
private:
Node const& m_layout_node;
int m_start { 0 };

16
Userland/Libraries/LibWeb/Layout/LineBuilder.cpp
View file

@ -78,7 +78,7 @@ void LineBuilder::append_box(Box const& box, CSSPixels leading_size, CSSPixels t
auto& box_state = m_layout_state.get_mutable(box);
auto& line_box = ensure_last_line_box();
line_box.add_fragment(box, 0, 0, leading_size, trailing_size, leading_margin, trailing_margin, box_state.content_width(), box_state.content_height(), box_state.border_box_top(), box_state.border_box_bottom());
m_max_height_on_current_line = max(m_max_height_on_current_line, box_state.border_box_height());
m_max_height_on_current_line = max(m_max_height_on_current_line, box_state.margin_box_height());
box_state.containing_line_box_fragment = LineBoxFragmentCoordinate {
.line_box_index = m_containing_block_state.line_boxes.size() - 1,
@ -235,11 +235,17 @@ void LineBuilder::update_last_line()
CSSPixels new_fragment_y = 0;
auto y_value_for_alignment = [&](CSS::VerticalAlign vertical_align) {
CSSPixels effective_box_top = fragment.border_box_top();
if (fragment.is_atomic_inline()) {
auto const& fragment_box_state = m_layout_state.get(static_cast<Box const&>(fragment.layout_node()));
effective_box_top = fragment_box_state.margin_box_top();
}
switch (vertical_align) {
case CSS::VerticalAlign::Baseline:
return m_current_y + line_box_baseline - fragment.baseline() + fragment.border_box_top();
return m_current_y + line_box_baseline - fragment.baseline() + effective_box_top;
case CSS::VerticalAlign::Top:
return m_current_y + fragment.border_box_top();
return m_current_y + effective_box_top;
case CSS::VerticalAlign::Middle:
case CSS::VerticalAlign::Bottom:
case CSS::VerticalAlign::Sub:
@ -247,7 +253,7 @@ void LineBuilder::update_last_line()
case CSS::VerticalAlign::TextBottom:
case CSS::VerticalAlign::TextTop:
// FIXME: These are all 'baseline'
return m_current_y + line_box_baseline - fragment.baseline() + fragment.border_box_top();
return m_current_y + line_box_baseline - fragment.baseline() + effective_box_top;
}
VERIFY_NOT_REACHED();
};
@ -268,7 +274,7 @@ void LineBuilder::update_last_line()
CSSPixels bottom_of_inline_box = 0;
{
// FIXME: Support inline-table elements.
if (fragment.layout_node().is_replaced_box() || (fragment.layout_node().display().is_inline_outside() && !fragment.layout_node().display().is_flow_inside())) {
if (fragment.is_atomic_inline()) {
auto const& fragment_box_state = m_layout_state.get(static_cast<Box const&>(fragment.layout_node()));
top_of_inline_box = (fragment.offset().y() - fragment_box_state.margin_box_top());
bottom_of_inline_box = (fragment.offset().y() + fragment_box_state.content_height() + fragment_box_state.margin_box_bottom());