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Eliminate LAYERS_NEEDED_FOR_DESCENDANTS flag

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This flag is no longer necessary, because stacking contexts can now
create layers lazily for content that needs to be stacked above a
layer. This should reduce the number of layers on pages, hopefully
reducing overdraw.
This commit is contained in:
Martin Robinson 2015-10-28 15:23:28 -07:00
parent 37201e3807
commit 6f4ce7a06e
3 changed files with 3 additions and 56 deletions
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9
components/layout/flow.rs
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@ -580,9 +580,6 @@ bitflags! {
const IMPACTED_BY_RIGHT_FLOATS = 0b0000_0000_0000_0000_1000,
// text align flags
#[doc = "Whether this flow contains a flow that has its own layer within the same absolute"]
#[doc = "containing block."]
const LAYERS_NEEDED_FOR_DESCENDANTS = 0b0000_0000_0000_0001_0000,
#[doc = "Whether this flow must have its own layer. Even if this flag is not set, it might"]
#[doc = "get its own layer if it's deemed to be likely to overlap flows with their own"]
#[doc = "layer."]
@ -810,18 +807,12 @@ pub struct LateAbsolutePositionInfo {
/// context. If the absolute containing block establishes the stacking context for this flow,
/// and this flow is not itself absolutely-positioned, then this is (0, 0).
pub stacking_relative_position_of_absolute_containing_block: Point2D<Au>,
/// Whether the absolute containing block forces positioned descendants to be layerized.
///
/// FIXME(pcwalton): Move into `FlowFlags`.
pub layers_needed_for_positioned_flows: bool,
}
impl LateAbsolutePositionInfo {
pub fn new() -> LateAbsolutePositionInfo {
LateAbsolutePositionInfo {
stacking_relative_position_of_absolute_containing_block: Point2D::zero(),
layers_needed_for_positioned_flows: false,
}
}
}