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LibWeb: Use rect of containing block instead of parent to clip overflow

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Move overflow clipping from `before_children_paint` into separate
method and call this method on containing block instead of parent.

Example that got fixed:
```html
<!DOCTYPE html><html><head><style>
    * {
      border: 2px solid black;
    }
    body {
      overflow: hidden;
    }
    .inner {
      position: absolute;
      width: 100px;
      height: 100px;
      background: lime;
    }
</style></head><body><div class=inner></div>
```
This commit is contained in:
Aliaksandr Kalenik 2023-01-25 04:50:14 +03:00 committed by Andreas Kling
parent ee4ba7617c
commit 08f217526a
4 changed files with 37 additions and 16 deletions
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3
Userland/Libraries/LibWeb/Painting/Paintable.h
View file

@ -88,6 +88,9 @@ public:
virtual void before_children_paint(PaintContext&, PaintPhase) const { }
virtual void after_children_paint(PaintContext&, PaintPhase) const { }
virtual void apply_clip_overflow_rect(PaintContext&, PaintPhase) const { }
virtual void clear_clip_overflow_rect(PaintContext&, PaintPhase) const { }
virtual Optional<HitTestResult> hit_test(CSSPixelPoint, HitTestType) const;
virtual bool wants_mouse_events() const { return false; }

4
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
View file

@ -318,7 +318,7 @@ Optional<Gfx::IntRect> PaintableBox::clip_rect() const
return m_clip_rect;
}
void PaintableBox::before_children_paint(PaintContext& context, PaintPhase phase) const
void PaintableBox::apply_clip_overflow_rect(PaintContext& context, PaintPhase phase) const
{
if (!AK::first_is_one_of(phase, PaintPhase::Background, PaintPhase::Border, PaintPhase::Foreground))
return;
@ -364,7 +364,7 @@ void PaintableBox::before_children_paint(PaintContext& context, PaintPhase phase
}
}
void PaintableBox::after_children_paint(PaintContext& context, PaintPhase phase) const
void PaintableBox::clear_clip_overflow_rect(PaintContext& context, PaintPhase phase) const
{
if (!AK::first_is_one_of(phase, PaintPhase::Background, PaintPhase::Border, PaintPhase::Foreground))
return;

4
Userland/Libraries/LibWeb/Painting/PaintableBox.h
View file

@ -114,8 +114,8 @@ public:
DOM::Document const& document() const { return layout_box().document(); }
DOM::Document& document() { return layout_box().document(); }
virtual void before_children_paint(PaintContext&, PaintPhase) const override;
virtual void after_children_paint(PaintContext&, PaintPhase) const override;
virtual void apply_clip_overflow_rect(PaintContext&, PaintPhase) const override;
virtual void clear_clip_overflow_rect(PaintContext&, PaintPhase) const override;
virtual Optional<HitTestResult> hit_test(CSSPixelPoint, HitTestType) const override;

42
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
View file

@ -71,8 +71,10 @@ static PaintPhase to_paint_phase(StackingContext::StackingContextPaintPhase phas
void StackingContext::paint_descendants(PaintContext& context, Layout::Node const& box, StackingContextPaintPhase phase) const
{
if (auto* paintable = box.paintable())
if (auto* paintable = box.paintable()) {
paintable->before_children_paint(context, to_paint_phase(phase));
paintable->apply_clip_overflow_rect(context, to_paint_phase(phase));
}
box.for_each_child([&](auto& child) {
// If `child` establishes its own stacking context, skip over it.
@ -124,8 +126,10 @@ void StackingContext::paint_descendants(PaintContext& context, Layout::Node cons
}
});
if (auto* paintable = box.paintable())
if (auto* paintable = box.paintable()) {
paintable->clear_clip_overflow_rect(context, to_paint_phase(phase));
paintable->after_children_paint(context, to_paint_phase(phase));
}
}
void StackingContext::paint_internal(PaintContext& context) const
@ -137,12 +141,20 @@ void StackingContext::paint_internal(PaintContext& context) const
auto paint_child = [&](auto* child) {
auto parent = child->m_box.parent();
auto* paintable = parent ? parent->paintable() : nullptr;
if (paintable)
paintable->before_children_paint(context, PaintPhase::Foreground);
auto* parent_paintable = parent ? parent->paintable() : nullptr;
if (parent_paintable)
parent_paintable->before_children_paint(context, PaintPhase::Foreground);
auto containing_block = child->m_box.containing_block();
auto* containing_block_paintable = containing_block ? containing_block->paintable() : nullptr;
if (containing_block_paintable)
containing_block_paintable->apply_clip_overflow_rect(context, PaintPhase::Foreground);
child->paint(context);
if (paintable)
paintable->after_children_paint(context, PaintPhase::Foreground);
if (parent_paintable)
parent_paintable->after_children_paint(context, PaintPhase::Foreground);
if (containing_block_paintable)
containing_block_paintable->clear_clip_overflow_rect(context, PaintPhase::Foreground);
};
// Draw positioned descendants with negative z-indices (step 3)
@ -178,9 +190,13 @@ void StackingContext::paint_internal(PaintContext& context) const
// but no stacking context of its own.
// FIXME: This is basically duplicating logic found elsewhere in this same function. Find a way to make this more elegant.
auto parent = paint_box.layout_node().parent();
auto* paintable = parent ? parent->paintable() : nullptr;
if (paintable)
paintable->before_children_paint(context, PaintPhase::Foreground);
auto* parent_paintable = parent ? parent->paintable() : nullptr;
if (parent_paintable)
parent_paintable->before_children_paint(context, PaintPhase::Foreground);
auto containing_block = paint_box.layout_node().containing_block();
auto* containing_block_paintable = containing_block ? containing_block->paintable() : nullptr;
if (containing_block_paintable)
containing_block_paintable->apply_clip_overflow_rect(context, PaintPhase::Foreground);
paint_node(paint_box.layout_box(), context, PaintPhase::Background);
paint_node(paint_box.layout_box(), context, PaintPhase::Border);
paint_descendants(context, paint_box.layout_box(), StackingContextPaintPhase::BackgroundAndBorders);
@ -191,8 +207,10 @@ void StackingContext::paint_internal(PaintContext& context) const
paint_node(paint_box.layout_box(), context, PaintPhase::FocusOutline);
paint_node(paint_box.layout_box(), context, PaintPhase::Overlay);
paint_descendants(context, paint_box.layout_box(), StackingContextPaintPhase::FocusAndOverlay);
if (paintable)
paintable->after_children_paint(context, PaintPhase::Foreground);
if (parent_paintable)
parent_paintable->after_children_paint(context, PaintPhase::Foreground);
if (containing_block_paintable)
containing_block_paintable->clear_clip_overflow_rect(context, PaintPhase::Foreground);
return TraversalDecision::Continue;
});