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layout: Implement opacity per CSS-COLOR § 3.2.

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This adds the infrastructure necessary to support stacking contexts that
are not containing blocks for absolutely-positioned elements. Our
infrastructure did not support that before. This minor revamp actually
ended up simplifying the logic around display list building and
stacking-relative position computation for absolutely-positioned flows,
which was nice.
This commit is contained in:
Patrick Walton 2014-11-18 15:37:53 -08:00
parent 873ca6cadd
commit 1c1c507c03
17 changed files with 421 additions and 146 deletions
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43
components/layout/block.rs
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@ -1722,20 +1722,31 @@ impl Flow for BlockFlow {
}
// Compute absolute position info for children.
let stacking_relative_position_of_absolute_containing_block_for_children =
if self.fragment.establishes_stacking_context() {
let logical_border_width = self.fragment.style().logical_border_width();
let position = LogicalPoint::new(self.base.writing_mode,
logical_border_width.inline_start,
logical_border_width.block_start);
let position = position.to_physical(self.base.writing_mode, container_size);
if self.is_positioned() {
position
} else {
// We establish a stacking context but are not positioned. (This will happen
// if, for example, the element has `position: static` but has `opacity` or
// `transform` set.) In this case, absolutely-positioned children will not be
// positioned relative to us but will instead be positioned relative to our
// containing block.
position - self.base.stacking_relative_position
}
} else {
self.base
.absolute_position_info
.stacking_relative_position_of_absolute_containing_block
};
let absolute_position_info_for_children = AbsolutePositionInfo {
stacking_relative_position_of_absolute_containing_block:
if self.fragment.establishes_stacking_context() {
let logical_border_width = self.fragment.style().logical_border_width();
LogicalPoint::new(self.base.writing_mode,
logical_border_width.inline_start,
logical_border_width.block_start).to_physical(
self.base.writing_mode,
container_size)
} else {
self.base
.absolute_position_info
.stacking_relative_position_of_absolute_containing_block
},
stacking_relative_position_of_absolute_containing_block_for_children,
relative_containing_block_size: self.fragment.content_box().size,
layers_needed_for_positioned_flows: self.base
.flags
@ -1760,17 +1771,11 @@ impl Flow for BlockFlow {
origin_for_children +
(kid_base.position.start + relative_offset).to_physical(writing_mode,
container_size);
kid_base.absolute_position_info = absolute_position_info_for_children
}
flow::mut_base(kid).absolute_position_info = absolute_position_info_for_children;
flow::mut_base(kid).clip_rect = clip_rect
}
// Process absolute descendant links.
for absolute_descendant in self.base.abs_descendants.iter() {
flow::mut_base(absolute_descendant).absolute_position_info =
absolute_position_info_for_children
}
}
fn mark_as_root(&mut self) {