mirror of
https://github.com/RGBCube/serenity
synced 2025-07-26 05:07:35 +00:00
LibWeb: Fix O(n^2) traversal in hit testing
We already walk the entire paint tree within each stacking context in the main hit testing function (StackingContext::hit_test()), so there's no need for each individual paintable to walk its own children again. By not doing that, we remove a source of O(n^2) traversal which made hit testing on deeply nested web pages unbearably slow.
This commit is contained in:
parent
f7cfd47b48
commit
996f3228a2
2 changed files with 8 additions and 18 deletions
|
@ -297,9 +297,8 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
|
|||
// 6. the child stacking contexts with stack level 0 and the positioned descendants with stack level 0.
|
||||
m_box.for_each_in_subtree_of_type<Layout::Box>([&](Layout::Box const& box) {
|
||||
if (box.is_positioned() && !box.paint_box()->stacking_context()) {
|
||||
result = box.paint_box()->hit_test(transformed_position, type);
|
||||
if (result.has_value())
|
||||
return IterationDecision::Break;
|
||||
if (auto candidate = box.paint_box()->hit_test(transformed_position, type); candidate.has_value())
|
||||
result = move(candidate);
|
||||
}
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
|
@ -316,9 +315,8 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
|
|||
// 4. the non-positioned floats.
|
||||
m_box.for_each_in_subtree_of_type<Layout::Box>([&](Layout::Box const& box) {
|
||||
if (box.is_floating()) {
|
||||
result = box.paint_box()->hit_test(transformed_position, type);
|
||||
if (result.has_value())
|
||||
return IterationDecision::Break;
|
||||
if (auto candidate = box.paint_box()->hit_test(transformed_position, type); candidate.has_value())
|
||||
result = move(candidate);
|
||||
}
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
|
@ -329,9 +327,8 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
|
|||
if (!m_box.children_are_inline()) {
|
||||
m_box.for_each_in_subtree_of_type<Layout::Box>([&](Layout::Box const& box) {
|
||||
if (!box.is_absolutely_positioned() && !box.is_floating()) {
|
||||
result = box.paint_box()->hit_test(transformed_position, type);
|
||||
if (result.has_value())
|
||||
return IterationDecision::Break;
|
||||
if (auto candidate = box.paint_box()->hit_test(transformed_position, type); candidate.has_value())
|
||||
result = move(candidate);
|
||||
}
|
||||
return IterationDecision::Continue;
|
||||
});
|
||||
|
|
Loading…
Add table
Add a link
Reference in a new issue