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LibWeb: Add Frame::ViewportClient and use it for Layout::ImageBox

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Image boxes want to know whether they are inside the visible viewport.
This is used to pause/resume animations, and to update the purgeable
memory volatility state.

Previously we would traverse the entire layout tree on every resize,
calling a helper on each ImageBox. Make those boxes register with the
frame they are interested in instead, saving us all that traversal.

This also makes it easier for other parts of the code to learn about
viewport changes in the future. :^)
This commit is contained in:
Andreas Kling 2021-01-30 12:25:33 +01:00
parent 1c6f278677
commit 9b0ca75f84
6 changed files with 39 additions and 22 deletions
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9
Userland/Libraries/LibWeb/Layout/InitialContainingBlockBox.cpp
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@ -63,15 +63,6 @@ void InitialContainingBlockBox::build_stacking_context_tree()
});
}
void InitialContainingBlockBox::did_set_viewport_rect(Badge<Frame>, const Gfx::IntRect& a_viewport_rect)
{
Gfx::FloatRect viewport_rect(a_viewport_rect.x(), a_viewport_rect.y(), a_viewport_rect.width(), a_viewport_rect.height());
for_each_in_subtree_of_type<ImageBox>([&](auto& layout_image) {
const_cast<ImageBox&>(layout_image).set_visible_in_viewport({}, viewport_rect.intersects(layout_image.absolute_rect()));
return IterationDecision::Continue;
});
}
void InitialContainingBlockBox::paint_all_phases(PaintContext& context)
{
paint(context, PaintPhase::Background);