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LibWeb: Use coordinate instead of WeakPtr for box->fragment connection

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Using WeakPtr to remember which LineBoxFragment owns which Box was
imposing some annoying constraints on the layout code. Importantly, it
was forcing us to heap-allocate fragments, which makes it much harder to
clone a FormattingState.

This patch replaces the WeakPtr with a coordinate system instead.
Fragments are referred to by their line box index + fragment index
within the line box.
This commit is contained in:
Andreas Kling 2022-02-27 10:26:38 +01:00
parent 726edd2d3b
commit 16a47165ee
5 changed files with 21 additions and 14 deletions
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9
Userland/Libraries/LibWeb/Layout/LineBuilder.cpp
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@ -52,8 +52,15 @@ LineBox& LineBuilder::ensure_last_line_box()
void LineBuilder::append_box(Box const& box, float leading_size, float trailing_size)
{
auto const& box_state = m_formatting_state.get(box);
ensure_last_line_box().add_fragment(box, 0, 0, leading_size, trailing_size, box_state.content_width, box_state.content_height, box_state.border_box_top(), box_state.border_box_bottom());
auto& line_box = ensure_last_line_box();
line_box.add_fragment(box, 0, 0, leading_size, trailing_size, 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.content_height);
// FIXME: Move this to FormattingContext!
const_cast<Box&>(box).set_containing_line_box_fragment({
.line_box_index = m_containing_block_state.line_boxes.size() - 1,
.fragment_index = line_box.fragments().size() - 1,
});
}
void LineBuilder::append_text_chunk(TextNode const& text_node, size_t offset_in_node, size_t length_in_node, float leading_size, float trailing_size, float content_width, float content_height)