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Remove concept of Layers from Servo

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Layers were a feature of the legacy drawing path. If we re-add them at
some point, it probably makes more sense to make them a product of
display list inspection.

This change also remove a bunch of dead painting code.
This commit is contained in:
Martin Robinson 2016-10-19 15:14:02 +02:00
parent e667e62f0c
commit ccb7ab926a
21 changed files with 57 additions and 745 deletions
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16
components/layout/flow.rs
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@ -35,7 +35,7 @@ use flow_list::{FlowList, MutFlowListIterator};
use flow_ref::{self, FlowRef, WeakFlowRef};
use fragment::{Fragment, FragmentBorderBoxIterator, Overflow, SpecificFragmentInfo};
use gfx::display_list::{ClippingRegion, StackingContext};
use gfx_traits::{LayerId, LayerType, StackingContextId};
use gfx_traits::StackingContextId;
use gfx_traits::print_tree::PrintTree;
use inline::InlineFlow;
use model::{CollapsibleMargins, IntrinsicISizes, MarginCollapseInfo};
@ -399,16 +399,6 @@ pub trait Flow: fmt::Debug + Sync + Send + 'static {
/// implications because this can be called on parents concurrently from descendants!
fn generated_containing_block_size(&self, _: OpaqueFlow) -> LogicalSize<Au>;
/// Returns a layer ID for the given fragment.
fn layer_id(&self) -> LayerId {
LayerId::new_of_type(LayerType::FragmentBody, base(self).flow_id())
}
/// Returns a layer ID for the given fragment.
fn layer_id_for_overflow_scroll(&self) -> LayerId {
LayerId::new_of_type(LayerType::OverflowScroll, base(self).flow_id())
}
/// Attempts to perform incremental fixup of this flow by replacing its fragment's style with
/// the new style. This can only succeed if the flow has exactly one fragment.
fn repair_style(&mut self, new_style: &Arc<ServoComputedValues>);
@ -634,10 +624,6 @@ bitflags! {
#[doc = "Flags used in flows."]
pub flags FlowFlags: u32 {
// text align flags
#[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."]
const NEEDS_LAYER = 0b0000_0000_0000_0000_0010_0000,
#[doc = "Whether this flow is absolutely positioned. This is checked all over layout, so a"]
#[doc = "virtual call is too expensive."]
const IS_ABSOLUTELY_POSITIONED = 0b0000_0000_0000_0000_0100_0000,