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LibWeb: Make the paint tree GC-allocated

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This simplifies the ownership model between DOM/layout/paint nodes
immensely by deferring to the garbage collector for figuring out what's
live and what's not.
This commit is contained in:
Andreas Kling 2023-01-11 12:51:49 +01:00
parent 35ba13802d
commit 4d401bf796
64 changed files with 148 additions and 108 deletions
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21
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -19,9 +19,14 @@
namespace Web::Painting {
NonnullRefPtr<PaintableBox> PaintableBox::create(Layout::Box const& layout_box)
JS::NonnullGCPtr<PaintableWithLines> PaintableWithLines::create(Layout::BlockContainer const& block_container)
{
return adopt_ref(*new PaintableBox(layout_box));
return block_container.heap().allocate_without_realm<PaintableWithLines>(block_container);
}
JS::NonnullGCPtr<PaintableBox> PaintableBox::create(Layout::Box const& layout_box)
{
return layout_box.heap().allocate_without_realm<PaintableBox>(layout_box);
}
PaintableBox::PaintableBox(Layout::Box const& layout_box)
@ -679,7 +684,7 @@ Optional<HitTestResult> PaintableBox::hit_test(CSSPixelPoint position, HitTestTy
continue;
return result;
}
return HitTestResult { *this };
return HitTestResult { const_cast<PaintableBox&>(*this) };
}
Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, HitTestType type) const
@ -700,7 +705,7 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
if (fragment_absolute_rect.contains(position)) {
if (is<Layout::BlockContainer>(fragment.layout_node()) && fragment.layout_node().paintable())
return fragment.layout_node().paintable()->hit_test(position, type);
return HitTestResult { *fragment.layout_node().paintable(), fragment.text_index_at(position.x()) };
return HitTestResult { const_cast<Paintable&>(const_cast<Paintable&>(*fragment.layout_node().paintable())), fragment.text_index_at(position.x()) };
}
// If we reached this point, the position is not within the fragment. However, the fragment start or end might be the place to place the cursor.
@ -709,14 +714,14 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
// We arbitrarily choose to consider the end of the line above and ignore the beginning of the line below.
// If we knew the direction of selection, we could make a better choice.
if (fragment_absolute_rect.bottom() <= position.y()) { // fully below the fragment
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() + fragment.length() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() + fragment.length() };
} else if (fragment_absolute_rect.top() <= position.y()) { // vertically within the fragment
if (position.x() < fragment_absolute_rect.left()) { // left of the fragment
if (!last_good_candidate.has_value()) { // first fragment of the line
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() };
}
} else { // right of the fragment
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() + fragment.length() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() + fragment.length() };
}
}
}
@ -725,7 +730,7 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
if (type == HitTestType::TextCursor && last_good_candidate.has_value())
return last_good_candidate;
if (is_visible() && absolute_border_box_rect().contains(position.x(), position.y()))
return HitTestResult { *this };
return HitTestResult { const_cast<PaintableWithLines&>(*this) };
return {};
}