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Wait as late as possible to assign ClipIds

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This will allow Servo to create ClipScrollNodes later during display
list construction, which will be necessary once rounded rectangles
are removed from the LocalClip structure. Instead of keeping track
of the ClipId of each ClipScrollNode, we keep track of its index in an
array of ClipScrollNodes. This will allow us to access them without a
hash lookup.
This commit is contained in:
Martin Robinson 2017-10-16 18:36:09 +02:00
parent a296e386af
commit 5937f62352
8 changed files with 365 additions and 274 deletions
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18
components/layout/flow.rs
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@ -35,11 +35,11 @@ use floats::{Floats, SpeculatedFloatPlacement};
use flow_list::{FlowList, FlowListIterator, MutFlowListIterator};
use flow_ref::{FlowRef, WeakFlowRef};
use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, Overflow};
use gfx::display_list::ClippingAndScrolling;
use gfx_traits::StackingContextId;
use gfx_traits::print_tree::PrintTree;
use inline::InlineFlow;
use model::{CollapsibleMargins, IntrinsicISizes, MarginCollapseInfo};
use msg::constellation_msg::PipelineId;
use multicol::MulticolFlow;
use parallel::FlowParallelInfo;
use serde::ser::{Serialize, SerializeStruct, Serializer};
@ -63,7 +63,6 @@ use table_colgroup::TableColGroupFlow;
use table_row::TableRowFlow;
use table_rowgroup::TableRowGroupFlow;
use table_wrapper::TableWrapperFlow;
use webrender_api::ClipAndScrollInfo;
/// This marker trait indicates that a type is a struct with `#[repr(C)]` whose first field
/// is of type `BaseFlow` or some type that also implements this trait.
@ -444,13 +443,10 @@ pub trait Flow: HasBaseFlow + fmt::Debug + Sync + Send + 'static {
/// children of this flow.
fn print_extra_flow_children(&self, _: &mut PrintTree) { }
fn clip_and_scroll_info(&self, pipeline_id: PipelineId) -> ClipAndScrollInfo {
match base(self).clip_and_scroll_info {
fn clipping_and_scrolling(&self) -> ClippingAndScrolling {
match base(self).clipping_and_scrolling {
Some(info) => info,
None => {
debug_assert!(false, "Tried to access scroll root id on Flow before assignment");
pipeline_id.root_clip_and_scroll_info()
}
None => unreachable!("Tried to access scroll root id on Flow before assignment"),
}
}
}
@ -920,7 +916,9 @@ pub struct BaseFlow {
/// list construction.
pub stacking_context_id: StackingContextId,
pub clip_and_scroll_info: Option<ClipAndScrollInfo>,
/// The indices of this Flow's ClipScrollNode. This is used to place the node's
/// display items into scrolling frames and clipping nodes.
pub clipping_and_scrolling: Option<ClippingAndScrolling>,
}
impl fmt::Debug for BaseFlow {
@ -1062,7 +1060,7 @@ impl BaseFlow {
writing_mode: writing_mode,
thread_id: 0,
stacking_context_id: StackingContextId::root(),
clip_and_scroll_info: None,
clipping_and_scrolling: None,
}
}