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Generalize the rest of layout to operate on generic Layout*.

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There wasn't a good way to split this up, unfortunately.

With this change, the only remaining usage of the Servo-specific structures is
in layout_task, where the root node is received from the script task. \o/
This commit is contained in:
Bobby Holley 2015-11-20 09:51:05 -08:00
parent 77a8091996
commit cf33f00018
10 changed files with 198 additions and 156 deletions
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43
components/layout/wrapper.rs
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@ -71,15 +71,25 @@ use style::restyle_hints::{ElementSnapshot, RESTYLE_DESCENDANTS, RESTYLE_LATER_S
use url::Url;
use util::str::{is_whitespace, search_index};
/// Opaque type stored in type-unsafe work queues for parallel layout.
/// Must be transmutable to and from LayoutNode.
pub type UnsafeLayoutNode = (usize, usize);
/// A wrapper so that layout can access only the methods that it should have access to. Layout must
/// only ever see these and must never see instances of `LayoutJS`.
pub trait LayoutNode<'ln> : Sized + Copy + Clone {
type ConcreteThreadSafeLayoutNode: ThreadSafeLayoutNode<'ln>;
type ConcreteLayoutElement: LayoutElement<'ln, ConcreteLayoutNode = Self,
ConcreteLayoutDocument = Self::ConcreteLayoutDocument>;
type ConcreteLayoutDocument: LayoutDocument<'ln, ConcreteLayoutNode = Self,
ConcreteLayoutElement = Self::ConcreteLayoutElement>;
fn to_unsafe(&self) -> UnsafeLayoutNode;
unsafe fn from_unsafe(&UnsafeLayoutNode) -> Self;
fn to_threadsafe(&self) -> Self::ConcreteThreadSafeLayoutNode;
/// Returns the type ID of this node.
fn type_id(&self) -> NodeTypeId;
@ -268,9 +278,26 @@ impl<'ln> ServoLayoutNode<'ln> {
}
impl<'ln> LayoutNode<'ln> for ServoLayoutNode<'ln> {
type ConcreteThreadSafeLayoutNode = ServoThreadSafeLayoutNode<'ln>;
type ConcreteLayoutElement = ServoLayoutElement<'ln>;
type ConcreteLayoutDocument = ServoLayoutDocument<'ln>;
fn to_unsafe(&self) -> UnsafeLayoutNode {
unsafe {
let ptr: usize = mem::transmute_copy(self);
(ptr, 0)
}
}
unsafe fn from_unsafe(n: &UnsafeLayoutNode) -> Self {
let (node, _) = *n;
mem::transmute(node)
}
fn to_threadsafe(&self) -> Self::ConcreteThreadSafeLayoutNode {
ServoThreadSafeLayoutNode::new(self)
}
fn type_id(&self) -> NodeTypeId {
unsafe {
self.node.type_id_for_layout()
@ -1281,22 +1308,6 @@ impl<'le> ThreadSafeLayoutElement<'le> for ServoThreadSafeLayoutElement<'le> {
}
}
/// Opaque type stored in type-unsafe work queues for parallel layout.
/// Must be transmutable to and from LayoutNode.
pub type UnsafeLayoutNode = (usize, usize);
pub fn layout_node_to_unsafe_layout_node(node: &ServoLayoutNode) -> UnsafeLayoutNode {
unsafe {
let ptr: usize = mem::transmute_copy(node);
(ptr, 0)
}
}
pub unsafe fn layout_node_from_unsafe_layout_node(node: &UnsafeLayoutNode) -> ServoLayoutNode {
let (node, _) = *node;
mem::transmute(node)
}
pub enum TextContent {
Text(String),
GeneratedContent(Vec<ContentItem>),