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Remove DisplayListBuildingResult

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Always produce a DisplayList when processing nodes for display list
construction. StackingContexts are now added to the positioned content
section of DisplayLists. This makes the code a bit simpler and opens up
the possibility of producing a StackingContext in another section of
the DisplayList. This doesn't change behavior, but is a cleanup
prerequisite for proper inline stacking context support.
This commit is contained in:
Martin Robinson 2015-11-02 12:27:12 -08:00
parent 37201e3807
commit e5b2feda3f
4 changed files with 50 additions and 70 deletions
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30
components/gfx/display_list/mod.rs
View file

@ -164,18 +164,30 @@ impl DisplayList {
}
}
/// Creates a new display list which contains a single stacking context.
#[inline]
pub fn new_with_stacking_context(stacking_context: Arc<StackingContext>) -> Box<DisplayList> {
let mut display_list = box DisplayList::new();
display_list.positioned_content.push_back(
DisplayItem::StackingContextClass(stacking_context));
display_list
}
/// Appends all display items from `other` into `self`, preserving stacking order and emptying
/// `other` in the process.
#[inline]
pub fn append_from(&mut self, other: &mut DisplayList) {
self.background_and_borders.append(&mut other.background_and_borders);
self.block_backgrounds_and_borders.append(&mut other.block_backgrounds_and_borders);
self.floats.append(&mut other.floats);
self.content.append(&mut other.content);
self.positioned_content.append(&mut other.positioned_content);
self.outlines.append(&mut other.outlines);
self.layered_children.append(&mut other.layered_children);
self.layer_info.append(&mut other.layer_info);
pub fn append_from(&mut self, other: &mut Option<Box<DisplayList>>) {
if let Some(mut other) = other.take() {
self.background_and_borders.append(&mut other.background_and_borders);
self.block_backgrounds_and_borders.append(&mut other.block_backgrounds_and_borders);
self.floats.append(&mut other.floats);
self.content.append(&mut other.content);
self.positioned_content.append(&mut other.positioned_content);
self.outlines.append(&mut other.outlines);
self.layered_children.append(&mut other.layered_children);
self.layer_info.append(&mut other.layer_info);
}
}
/// Merges all display items from all non-float stacking levels to the `float` stacking level.

71
components/layout/display_list_builder.rs
View file

@ -66,31 +66,6 @@ use util::range::Range;
/// The logical width of an insertion point: at the moment, a one-pixel-wide line.
const INSERTION_POINT_LOGICAL_WIDTH: Au = Au(1 * AU_PER_PX);
/// The results of display list building for a single flow.
pub enum DisplayListBuildingResult {
None,
StackingContext(Arc<StackingContext>),
Normal(Box<DisplayList>),
}
impl DisplayListBuildingResult {
/// Adds the display list items contained within this display list building result to the given
/// display list, preserving stacking order. If this display list building result does not
/// consist of an entire stacking context, it will be emptied.
pub fn add_to(&mut self, display_list: &mut DisplayList) {
match *self {
DisplayListBuildingResult::None => return,
DisplayListBuildingResult::StackingContext(ref mut stacking_context) => {
display_list.positioned_content.push_back(
DisplayItem::StackingContextClass((*stacking_context).clone()))
}
DisplayListBuildingResult::Normal(ref mut source_display_list) => {
display_list.append_from(&mut **source_display_list)
}
}
}
}
pub trait FragmentDisplayListBuilding {
/// Adds the display items necessary to paint the background of this fragment to the display
/// list if necessary.
@ -1587,7 +1562,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
// Add children.
for kid in self.base.children.iter_mut() {
flow::mut_base(kid).display_list_building_result.add_to(display_list);
display_list.append_from(&mut flow::mut_base(kid).display_list_building_result);
}
self.base.build_display_items_for_debugging_tint(display_list, self.fragment.node);
@ -1610,17 +1585,16 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
ScrollPolicy::Scrollable
};
DisplayListBuildingResult::StackingContext(
self.fragment.create_stacking_context(
&self.base,
display_list,
scroll_policy,
StackingContextCreationMode::Normal))
Some(DisplayList::new_with_stacking_context(
self.fragment.create_stacking_context(&self.base,
display_list,
scroll_policy,
StackingContextCreationMode::Normal)))
} else {
if self.fragment.style.get_box().position != position::T::static_ {
display_list.form_pseudo_stacking_context_for_positioned_content();
}
DisplayListBuildingResult::Normal(display_list)
Some(display_list)
}
}
@ -1655,7 +1629,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
// Add the fragments of our children to the display list we'll use for the inner
// stacking context.
for kid in self.base.children.iter_mut() {
flow::mut_base(kid).display_list_building_result.add_to(&mut *display_list);
display_list.append_from(&mut flow::mut_base(kid).display_list_building_result);
}
Some(outer_display_list_for_overflow_scroll)
@ -1678,8 +1652,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
if !self.fragment.flags.contains(HAS_LAYER) && !self.fragment.establishes_stacking_context() {
display_list.form_pseudo_stacking_context_for_positioned_content();
self.base.display_list_building_result =
DisplayListBuildingResult::Normal(display_list);
self.base.display_list_building_result = Some(display_list);
return;
}
@ -1714,7 +1687,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
};
self.base.display_list_building_result =
DisplayListBuildingResult::StackingContext(stacking_context)
Some(DisplayList::new_with_stacking_context(stacking_context));
}
fn build_display_list_for_floating_block(&mut self,
@ -1728,16 +1701,16 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
display_list.form_float_pseudo_stacking_context();
self.base.display_list_building_result = if self.fragment.establishes_stacking_context() {
DisplayListBuildingResult::StackingContext(
Some(DisplayList::new_with_stacking_context(
self.fragment.create_stacking_context(&self.base,
display_list,
ScrollPolicy::Scrollable,
StackingContextCreationMode::Normal))
StackingContextCreationMode::Normal)))
} else {
if self.fragment.style.get_box().position != position::T::static_ {
display_list.form_pseudo_stacking_context_for_positioned_content();
}
DisplayListBuildingResult::Normal(display_list)
Some(display_list)
}
}
@ -1796,18 +1769,18 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
match fragment.specific {
SpecificFragmentInfo::InlineBlock(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
flow::mut_base(block_flow).display_list_building_result
.add_to(&mut *display_list)
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsoluteHypothetical(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
flow::mut_base(block_flow).display_list_building_result
.add_to(&mut *display_list)
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
SpecificFragmentInfo::InlineAbsolute(ref mut block_flow) => {
let block_flow = flow_ref::deref_mut(&mut block_flow.flow_ref);
flow::mut_base(block_flow).display_list_building_result
.add_to(&mut *display_list)
display_list.append_from(
&mut flow::mut_base(block_flow).display_list_building_result)
}
_ => {}
}
@ -1833,14 +1806,14 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
}
self.base.display_list_building_result = if has_stacking_context {
DisplayListBuildingResult::StackingContext(
Some(DisplayList::new_with_stacking_context(
self.fragments.fragments[0].create_stacking_context(
&self.base,
display_list,
ScrollPolicy::Scrollable,
StackingContextCreationMode::Normal))
StackingContextCreationMode::Normal)))
} else {
DisplayListBuildingResult::Normal(display_list)
Some(display_list)
};
if opts::get().validate_display_list_geometry {

14
components/layout/flow.rs
View file

@ -28,13 +28,12 @@
use app_units::Au;
use block::BlockFlow;
use context::LayoutContext;
use display_list_builder::DisplayListBuildingResult;
use euclid::{Point2D, Rect, Size2D};
use floats::Floats;
use flow_list::{FlowList, FlowListIterator, MutFlowListIterator};
use flow_ref::{self, FlowRef, WeakFlowRef};
use fragment::{Fragment, FragmentBorderBoxIterator, SpecificFragmentInfo};
use gfx::display_list::ClippingRegion;
use gfx::display_list::{ClippingRegion, DisplayList};
use incremental::{self, RECONSTRUCT_FLOW, REFLOW, REFLOW_OUT_OF_FLOW, RestyleDamage};
use inline::InlineFlow;
use model::{CollapsibleMargins, IntrinsicISizes, MarginCollapseInfo};
@ -906,7 +905,7 @@ pub struct BaseFlow {
pub stacking_relative_position_of_display_port: Rect<Au>,
/// The results of display list building for this flow.
pub display_list_building_result: DisplayListBuildingResult,
pub display_list_building_result: Option<Box<DisplayList>>,
/// The writing mode for this flow.
pub writing_mode: WritingMode,
@ -1052,7 +1051,7 @@ impl BaseFlow {
block_container_writing_mode: writing_mode,
block_container_explicit_block_size: None,
absolute_cb: ContainingBlockLink::new(),
display_list_building_result: DisplayListBuildingResult::None,
display_list_building_result: None,
early_absolute_position_info: EarlyAbsolutePositionInfo::new(writing_mode),
late_absolute_position_info: LateAbsolutePositionInfo::new(),
clip: ClippingRegion::max(),
@ -1083,11 +1082,8 @@ impl BaseFlow {
let bounds = Rect::new(self.stacking_relative_position, position_with_overflow.size);
let all_items = match self.display_list_building_result {
DisplayListBuildingResult::None => Vec::new(),
DisplayListBuildingResult::StackingContext(ref stacking_context) => {
stacking_context.display_list.flatten()
}
DisplayListBuildingResult::Normal(ref display_list) => display_list.flatten(),
Some(ref display_list) => display_list.flatten(),
None => Vec::new(),
};
for item in &all_items {

5
components/layout/layout_task.rs
View file

@ -1084,9 +1084,8 @@ impl LayoutTask {
}
};
let mut display_list = box DisplayList::new();
flow::mut_base(flow_ref::deref_mut(layout_root))
.display_list_building_result
.add_to(&mut *display_list);
display_list.append_from(&mut flow::mut_base(flow_ref::deref_mut(layout_root))
.display_list_building_result);
let origin = Rect::new(Point2D::new(Au(0), Au(0)), root_size);
let stacking_context = Arc::new(StackingContext::new(display_list,