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layout: Implement ordered lists, CSS counters, and quotes per CSS 2.1
§ 12.3-12.5. Only simple alphabetic and numeric counter styles are supported. (This is most of them though.) Although this PR adds a sequential pass to layout, I verified that on pages that contain a reasonable number of ordered lists (Reddit `/r/rust`), the time spent in generated content resolution is dwarfed by the time spent in the parallelizable parts of layout. So I don't expect this to negatively affect our parallelism expect perhaps in pathological cases.
This commit is contained in:
Patrick Walton
parent
2df4dd9e09
commit
f9cdd05d58
39 changed files with 1704 additions and 537 deletions
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@ -8,13 +8,12 @@
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use canvas::canvas_paint_task::CanvasMsg;
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use css::node_style::StyledNode;
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use construct::FlowConstructor;
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use context::LayoutContext;
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use floats::ClearType;
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use flow;
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use flow::Flow;
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use flow_ref::FlowRef;
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use incremental::RestyleDamage;
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use incremental::{self, RestyleDamage};
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use inline::{InlineFragmentContext, InlineMetrics};
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use layout_debug;
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use model::{IntrinsicISizes, IntrinsicISizesContribution, MaybeAuto, specified};
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@ -44,15 +43,17 @@ use std::collections::DList;
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use std::fmt;
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use std::num::ToPrimitive;
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use std::str::FromStr;
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use std::sync::{Arc, Mutex};
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use std::sync::mpsc::Sender;
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use std::sync::{Arc, Mutex};
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use string_cache::Atom;
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use style::properties::{ComputedValues, cascade_anonymous, make_border};
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use style::node::{TElement, TNode};
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use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto, LengthOrPercentageOrNone};
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use style::computed_values::content::ContentItem;
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use style::computed_values::{clear, mix_blend_mode, overflow_wrap};
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use style::computed_values::{position, text_align, text_decoration, vertical_align, white_space};
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use style::computed_values::{word_break};
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use style::node::{TElement, TNode};
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use style::properties::{ComputedValues, cascade_anonymous, make_border};
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use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto};
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use style::values::computed::{LengthOrPercentageOrNone};
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use text::TextRunScanner;
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use url::Url;
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@ -136,6 +137,11 @@ impl Encodable for Fragment {
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#[derive(Clone)]
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pub enum SpecificFragmentInfo {
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Generic,
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/// A piece of generated content that cannot be resolved into `ScannedText` until the generated
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/// content resolution phase (e.g. an ordered list item marker).
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GeneratedContent(Box<GeneratedContentInfo>),
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Iframe(Box<IframeFragmentInfo>),
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Image(Box<ImageFragmentInfo>),
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Canvas(Box<CanvasFragmentInfo>),
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@ -158,17 +164,18 @@ impl SpecificFragmentInfo {
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fn restyle_damage(&self) -> RestyleDamage {
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let flow =
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match *self {
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SpecificFragmentInfo::Iframe(_)
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| SpecificFragmentInfo::Image(_)
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| SpecificFragmentInfo::ScannedText(_)
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| SpecificFragmentInfo::Table
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| SpecificFragmentInfo::TableCell
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| SpecificFragmentInfo::TableColumn(_)
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| SpecificFragmentInfo::TableRow
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| SpecificFragmentInfo::TableWrapper
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| SpecificFragmentInfo::UnscannedText(_)
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| SpecificFragmentInfo::Canvas(_)
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| SpecificFragmentInfo::Generic => return RestyleDamage::empty(),
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::ScannedText(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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SpecificFragmentInfo::TableColumn(_) |
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SpecificFragmentInfo::TableRow |
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SpecificFragmentInfo::TableWrapper |
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SpecificFragmentInfo::UnscannedText(_) |
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SpecificFragmentInfo::Generic => return RestyleDamage::empty(),
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SpecificFragmentInfo::InlineAbsoluteHypothetical(ref info) => &info.flow_ref,
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SpecificFragmentInfo::InlineBlock(ref info) => &info.flow_ref,
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};
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@ -180,9 +187,12 @@ impl SpecificFragmentInfo {
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match *self {
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SpecificFragmentInfo::Canvas(_) => "SpecificFragmentInfo::Canvas",
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SpecificFragmentInfo::Generic => "SpecificFragmentInfo::Generic",
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SpecificFragmentInfo::GeneratedContent(_) => "SpecificFragmentInfo::GeneratedContent",
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SpecificFragmentInfo::Iframe(_) => "SpecificFragmentInfo::Iframe",
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SpecificFragmentInfo::Image(_) => "SpecificFragmentInfo::Image",
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) => "SpecificFragmentInfo::InlineAbsoluteHypothetical",
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) => {
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"SpecificFragmentInfo::InlineAbsoluteHypothetical"
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}
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SpecificFragmentInfo::InlineBlock(_) => "SpecificFragmentInfo::InlineBlock",
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SpecificFragmentInfo::ScannedText(_) => "SpecificFragmentInfo::ScannedText",
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SpecificFragmentInfo::Table => "SpecificFragmentInfo::Table",
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@ -196,8 +206,11 @@ impl SpecificFragmentInfo {
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}
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/// Clamp a value obtained from style_length, based on min / max lengths.
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fn clamp_size(size: Au, min_size: LengthOrPercentage, max_size: LengthOrPercentageOrNone,
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container_inline_size: Au) -> Au {
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fn clamp_size(size: Au,
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min_size: LengthOrPercentage,
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max_size: LengthOrPercentageOrNone,
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container_inline_size: Au)
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-> Au {
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let min_size = model::specified(min_size, container_inline_size);
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let max_size = model::specified_or_none(max_size, container_inline_size);
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@ -207,6 +220,13 @@ fn clamp_size(size: Au, min_size: LengthOrPercentage, max_size: LengthOrPercenta
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})
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}
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/// Information for generated content.
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#[derive(Clone)]
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pub enum GeneratedContentInfo {
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ListItem,
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ContentItem(ContentItem),
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}
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/// A hypothetical box (see CSS 2.1 § 10.3.7) for an absolutely-positioned block that was declared
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/// with `display: inline;`.
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///
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@ -637,14 +657,6 @@ pub struct UnscannedTextFragmentInfo {
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}
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impl UnscannedTextFragmentInfo {
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/// Creates a new instance of `UnscannedTextFragmentInfo` from the given DOM node.
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pub fn new(node: &ThreadSafeLayoutNode) -> UnscannedTextFragmentInfo {
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// FIXME(pcwalton): Don't copy text; atomically reference count it instead.
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UnscannedTextFragmentInfo {
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text: box node.text(),
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}
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}
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/// Creates a new instance of `UnscannedTextFragmentInfo` from the given text.
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#[inline]
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pub fn from_text(text: String) -> UnscannedTextFragmentInfo {
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@ -678,34 +690,8 @@ impl TableColumnFragmentInfo {
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}
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impl Fragment {
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/// Constructs a new `Fragment` instance for the given node.
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///
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/// This does *not* construct the text for generated content. See comments in
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/// `FlowConstructor::build_specific_fragment_info_for_node()` for more details.
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///
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/// Arguments:
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///
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/// * `constructor`: The flow constructor.
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/// * `node`: The node to create a fragment for.
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pub fn new(constructor: &mut FlowConstructor, node: &ThreadSafeLayoutNode) -> Fragment {
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let style = node.style().clone();
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let writing_mode = style.writing_mode;
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Fragment {
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node: OpaqueNodeMethods::from_thread_safe_layout_node(node),
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style: style,
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restyle_damage: node.restyle_damage(),
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border_box: LogicalRect::zero(writing_mode),
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border_padding: LogicalMargin::zero(writing_mode),
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margin: LogicalMargin::zero(writing_mode),
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specific: constructor.build_specific_fragment_info_for_node(node),
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inline_context: None,
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debug_id: layout_debug::generate_unique_debug_id(),
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}
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}
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/// Constructs a new `Fragment` instance from a specific info.
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pub fn new_from_specific_info(node: &ThreadSafeLayoutNode, specific: SpecificFragmentInfo)
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-> Fragment {
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/// Constructs a new `Fragment` instance.
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pub fn new(node: &ThreadSafeLayoutNode, specific: SpecificFragmentInfo) -> Fragment {
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let style = node.style().clone();
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let writing_mode = style.writing_mode;
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Fragment {
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@ -721,24 +707,6 @@ impl Fragment {
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}
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}
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/// Constructs a new `Fragment` instance for an anonymous object.
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pub fn new_anonymous(constructor: &mut FlowConstructor, node: &ThreadSafeLayoutNode)
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-> Fragment {
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let node_style = cascade_anonymous(&**node.style());
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let writing_mode = node_style.writing_mode;
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Fragment {
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node: OpaqueNodeMethods::from_thread_safe_layout_node(node),
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style: Arc::new(node_style),
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restyle_damage: node.restyle_damage(),
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border_box: LogicalRect::zero(writing_mode),
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border_padding: LogicalMargin::zero(writing_mode),
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margin: LogicalMargin::zero(writing_mode),
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specific: constructor.build_specific_fragment_info_for_node(node),
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inline_context: None,
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debug_id: layout_debug::generate_unique_debug_id(),
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}
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}
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/// Constructs a new `Fragment` instance for an anonymous table object.
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pub fn new_anonymous_from_specific_info(node: &ThreadSafeLayoutNode,
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specific: SpecificFragmentInfo)
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@ -837,7 +805,7 @@ impl Fragment {
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Fragment {
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node: self.node,
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style: self.style.clone(),
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restyle_damage: RestyleDamage::all(),
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restyle_damage: incremental::rebuild_and_reflow(),
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border_box: new_border_box,
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border_padding: self.border_padding,
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margin: self.margin,
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@ -912,6 +880,7 @@ impl Fragment {
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match self.specific {
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::InlineBlock(_) => {
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@ -931,7 +900,9 @@ impl Fragment {
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INTRINSIC_INLINE_SIZE_INCLUDES_BORDER |
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INTRINSIC_INLINE_SIZE_INCLUDES_SPECIFIED
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}
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SpecificFragmentInfo::ScannedText(_) | SpecificFragmentInfo::TableColumn(_) | SpecificFragmentInfo::UnscannedText(_) |
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SpecificFragmentInfo::ScannedText(_) |
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SpecificFragmentInfo::TableColumn(_) |
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SpecificFragmentInfo::UnscannedText(_) |
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) => {
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QuantitiesIncludedInIntrinsicInlineSizes::empty()
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}
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@ -1221,6 +1192,14 @@ impl Fragment {
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}
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}
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/// Returns true if and only if this fragment is a generated content fragment.
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pub fn is_generated_content(&self) -> bool {
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match self.specific {
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SpecificFragmentInfo::GeneratedContent(..) => true,
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_ => false,
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}
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}
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/// Returns true if and only if this is a scanned text fragment.
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pub fn is_scanned_text_fragment(&self) -> bool {
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match self.specific {
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@ -1234,6 +1213,7 @@ impl Fragment {
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let mut result = self.style_specified_intrinsic_inline_size();
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match self.specific {
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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@ -1303,6 +1283,7 @@ impl Fragment {
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pub fn content_inline_size(&self) -> Au {
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match self.specific {
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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@ -1334,6 +1315,7 @@ impl Fragment {
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pub fn content_block_size(&self, layout_context: &LayoutContext) -> Au {
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match self.specific {
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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@ -1352,7 +1334,7 @@ impl Fragment {
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self.calculate_line_height(layout_context)
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}
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SpecificFragmentInfo::TableColumn(_) => {
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panic!("Table column fragments do not have block_size")
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panic!("Table column fragments do not have block size")
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}
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SpecificFragmentInfo::UnscannedText(_) => {
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panic!("Unscanned text fragments should have been scanned by now!")
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@ -1382,6 +1364,7 @@ impl Fragment {
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match self.specific {
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::Table |
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@ -1689,22 +1672,23 @@ impl Fragment {
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pub fn assign_replaced_inline_size_if_necessary<'a>(&'a mut self, container_inline_size: Au) {
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match self.specific {
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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SpecificFragmentInfo::TableRow |
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SpecificFragmentInfo::TableWrapper => return,
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SpecificFragmentInfo::TableColumn(_) => {
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panic!("Table column fragments do not have inline_size")
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panic!("Table column fragments do not have inline size")
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}
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SpecificFragmentInfo::UnscannedText(_) => {
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panic!("Unscanned text fragments should have been scanned by now!")
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}
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::ScannedText(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::InlineBlock(_) |
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
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SpecificFragmentInfo::Iframe(_) => {}
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SpecificFragmentInfo::ScannedText(_) => {}
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};
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let style = self.style().clone();
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@ -1770,22 +1754,23 @@ impl Fragment {
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pub fn assign_replaced_block_size_if_necessary(&mut self, containing_block_block_size: Au) {
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match self.specific {
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Table |
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SpecificFragmentInfo::TableCell |
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SpecificFragmentInfo::TableRow |
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SpecificFragmentInfo::TableWrapper => return,
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SpecificFragmentInfo::TableColumn(_) => {
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panic!("Table column fragments do not have block_size")
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panic!("Table column fragments do not have block size")
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}
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SpecificFragmentInfo::UnscannedText(_) => {
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panic!("Unscanned text fragments should have been scanned by now!")
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}
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::ScannedText(_) |
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SpecificFragmentInfo::InlineBlock(_) |
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SpecificFragmentInfo::InlineAbsoluteHypothetical(_) |
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SpecificFragmentInfo::Iframe(_) => {}
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SpecificFragmentInfo::ScannedText(_) => {}
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}
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let style = self.style().clone();
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@ -1923,6 +1908,7 @@ impl Fragment {
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SpecificFragmentInfo::TableWrapper => false,
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SpecificFragmentInfo::Canvas(_) |
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SpecificFragmentInfo::Generic |
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SpecificFragmentInfo::GeneratedContent(_) |
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SpecificFragmentInfo::Iframe(_) |
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SpecificFragmentInfo::Image(_) |
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SpecificFragmentInfo::ScannedText(_) |
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