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https://github.com/servo/servo.git
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Handle cases where the layout root is None. Fixes #6375.
This commit is contained in:
Glenn Watson
parent
0bc7ad9b08
commit
a02d28a732
4 changed files with 199 additions and 99 deletions
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@ -2436,7 +2436,7 @@ pub trait ISizeAndMarginsComputer {
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// Invariant: inline-start_margin + inline-size + inline-end_margin ==
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// available_inline-size
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let (inline_start_margin, mut inline_size, inline_end_margin) =
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let (inline_start_margin, inline_size, inline_end_margin) =
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match (inline_start_margin, computed_inline_size, inline_end_margin) {
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// If all have a computed value other than 'auto', the system is over-constrained.
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(MaybeAuto::Specified(margin_start),
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@ -2922,7 +2922,7 @@ impl ISizeAndMarginsComputer for InlineBlockNonReplaced {
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block: &mut BlockFlow,
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input: &ISizeConstraintInput)
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-> ISizeConstraintSolution {
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let (mut computed_inline_size,
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let (computed_inline_size,
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inline_start_margin,
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inline_end_margin,
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available_inline_size) =
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@ -2963,7 +2963,7 @@ impl ISizeAndMarginsComputer for InlineBlockReplaced {
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MaybeAuto::Auto => false,
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});
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let (mut computed_inline_size,
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let (computed_inline_size,
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inline_start_margin,
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inline_end_margin,
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available_inline_size) =
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@ -156,6 +156,14 @@ pub struct LayoutTaskData {
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pub visible_rects: Arc<HashMap<LayerId, Rect<Au>, DefaultState<FnvHasher>>>,
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}
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impl LayoutTaskData {
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pub fn layout_root(&self) -> Option<FlowRef> {
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self.root_flow.as_ref().map(|root_flow| {
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root_flow.clone()
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})
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}
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}
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/// Information needed by the layout task.
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pub struct LayoutTask {
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/// The ID of the pipeline that we belong to.
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@ -786,10 +794,6 @@ impl LayoutTask {
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Some(flow)
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}
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fn get_layout_root(&self, node: LayoutNode) -> FlowRef {
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self.try_get_layout_root(node).expect("no layout root")
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}
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/// Performs layout constraint solving.
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///
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/// This corresponds to `Reflow()` in Gecko and `layout()` in WebKit/Blink and should be
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@ -1161,7 +1165,7 @@ impl LayoutTask {
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});
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// Retrieve the (possibly rebuilt) root flow.
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rw_data.root_flow = Some(self.get_layout_root((*node).clone()));
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rw_data.root_flow = self.try_get_layout_root((*node).clone());
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// Kick off animations if any were triggered.
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animation::process_new_animations(&mut *rw_data, self.id);
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@ -1178,22 +1182,22 @@ impl LayoutTask {
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&mut rw_data,
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&mut shared_layout_context);
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let mut root_flow = (*rw_data.root_flow.as_ref().unwrap()).clone();
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match data.query_type {
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ReflowQueryType::ContentBoxQuery(node) =>
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process_content_box_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::ContentBoxesQuery(node) =>
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process_content_boxes_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::NodeGeometryQuery(node) =>
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self.process_node_geometry_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::ResolvedStyleQuery(node, ref pseudo, ref property) =>
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self.process_resolved_style_request(node, pseudo, property, &mut root_flow, &mut rw_data),
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ReflowQueryType::OffsetParentQuery(node) =>
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self.process_offset_parent_query(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::NoQuery => {}
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if let Some(mut root_flow) = rw_data.layout_root() {
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match data.query_type {
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ReflowQueryType::ContentBoxQuery(node) =>
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process_content_box_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::ContentBoxesQuery(node) =>
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process_content_boxes_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::NodeGeometryQuery(node) =>
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self.process_node_geometry_request(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::ResolvedStyleQuery(node, ref pseudo, ref property) =>
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self.process_resolved_style_request(node, pseudo, property, &mut root_flow, &mut rw_data),
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ReflowQueryType::OffsetParentQuery(node) =>
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self.process_offset_parent_query(node, &mut root_flow, &mut rw_data),
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ReflowQueryType::NoQuery => {}
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}
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}
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// Tell script that we're done.
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//
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// FIXME(pcwalton): This should probably be *one* channel, but we can't fix this without
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@ -1279,23 +1283,16 @@ impl LayoutTask {
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&self.url,
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reflow_info.goal);
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match rw_data.root_flow.as_ref() {
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None => {
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// We haven't performed a single layout yet! Do nothing.
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return
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}
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Some(ref root_flow) => {
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// Perform an abbreviated style recalc that operates without access to the DOM.
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let mut root_flow = (*root_flow).clone();
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let animations = &*rw_data.running_animations;
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profile(time::ProfilerCategory::LayoutStyleRecalc,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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animation::recalc_style_for_animations(flow_ref::deref_mut(&mut root_flow),
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animations)
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});
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}
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if let Some(mut root_flow) = rw_data.layout_root() {
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// Perform an abbreviated style recalc that operates without access to the DOM.
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let animations = &*rw_data.running_animations;
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profile(time::ProfilerCategory::LayoutStyleRecalc,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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animation::recalc_style_for_animations(flow_ref::deref_mut(&mut root_flow),
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animations)
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});
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}
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self.perform_post_style_recalc_layout_passes(&reflow_info,
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@ -1307,54 +1304,55 @@ impl LayoutTask {
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data: &Reflow,
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rw_data: &mut LayoutTaskData,
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layout_context: &mut SharedLayoutContext) {
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let mut root_flow = (*rw_data.root_flow.as_ref().unwrap()).clone();
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profile(time::ProfilerCategory::LayoutRestyleDamagePropagation,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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if opts::get().nonincremental_layout || flow_ref::deref_mut(&mut root_flow)
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.compute_layout_damage()
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.contains(REFLOW_ENTIRE_DOCUMENT) {
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flow_ref::deref_mut(&mut root_flow).reflow_entire_document()
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if let Some(mut root_flow) = rw_data.layout_root() {
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profile(time::ProfilerCategory::LayoutRestyleDamagePropagation,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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if opts::get().nonincremental_layout || flow_ref::deref_mut(&mut root_flow)
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.compute_layout_damage()
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.contains(REFLOW_ENTIRE_DOCUMENT) {
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flow_ref::deref_mut(&mut root_flow).reflow_entire_document()
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}
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});
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// Verification of the flow tree, which ensures that all nodes were either marked as leaves
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// or as non-leaves. This becomes a no-op in release builds. (It is inconsequential to
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// memory safety but is a useful debugging tool.)
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self.verify_flow_tree(&mut root_flow);
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if opts::get().trace_layout {
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layout_debug::begin_trace(root_flow.clone());
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}
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});
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// Verification of the flow tree, which ensures that all nodes were either marked as leaves
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// or as non-leaves. This becomes a no-op in release builds. (It is inconsequential to
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// memory safety but is a useful debugging tool.)
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self.verify_flow_tree(&mut root_flow);
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// Resolve generated content.
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profile(time::ProfilerCategory::LayoutGeneratedContent,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| sequential::resolve_generated_content(&mut root_flow, &layout_context));
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if opts::get().trace_layout {
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layout_debug::begin_trace(root_flow.clone());
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// Perform the primary layout passes over the flow tree to compute the locations of all
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// the boxes.
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profile(time::ProfilerCategory::LayoutMain,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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match rw_data.parallel_traversal {
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None => {
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// Sequential mode.
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self.solve_constraints(&mut root_flow, &layout_context)
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}
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Some(ref mut parallel) => {
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// Parallel mode.
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self.solve_constraints_parallel(parallel,
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&mut root_flow,
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&mut *layout_context);
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}
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}
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});
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self.perform_post_main_layout_passes(data, rw_data, layout_context);
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}
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// Resolve generated content.
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profile(time::ProfilerCategory::LayoutGeneratedContent,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| sequential::resolve_generated_content(&mut root_flow, &layout_context));
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// Perform the primary layout passes over the flow tree to compute the locations of all
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// the boxes.
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profile(time::ProfilerCategory::LayoutMain,
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self.profiler_metadata(),
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self.time_profiler_chan.clone(),
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|| {
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match rw_data.parallel_traversal {
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None => {
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// Sequential mode.
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self.solve_constraints(&mut root_flow, &layout_context)
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}
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Some(ref mut parallel) => {
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// Parallel mode.
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self.solve_constraints_parallel(parallel,
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&mut root_flow,
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&mut *layout_context);
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}
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}
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});
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self.perform_post_main_layout_passes(data, rw_data, layout_context);
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}
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fn perform_post_main_layout_passes<'a>(&'a self,
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@ -1362,22 +1360,23 @@ impl LayoutTask {
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rw_data: &mut LayoutTaskData,
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layout_context: &mut SharedLayoutContext) {
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// Build the display list if necessary, and send it to the painter.
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let mut root_flow = (*rw_data.root_flow.as_ref().unwrap()).clone();
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self.compute_abs_pos_and_build_display_list(data,
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&mut root_flow,
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&mut *layout_context,
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rw_data);
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self.first_reflow.set(false);
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if let Some(mut root_flow) = rw_data.layout_root() {
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self.compute_abs_pos_and_build_display_list(data,
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&mut root_flow,
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&mut *layout_context,
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rw_data);
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self.first_reflow.set(false);
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if opts::get().trace_layout {
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layout_debug::end_trace();
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if opts::get().trace_layout {
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layout_debug::end_trace();
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}
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if opts::get().dump_flow_tree {
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root_flow.dump();
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}
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rw_data.generation += 1;
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}
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if opts::get().dump_flow_tree {
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root_flow.dump();
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}
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rw_data.generation += 1;
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}
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unsafe fn dirty_all_nodes(node: &mut LayoutNode) {
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