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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use construct::{ConstructionResult, NoConstructionResult};
use incremental::RestyleDamage;
use parallel::DomParallelInfo;
use wrapper::{LayoutNode, TLayoutNode, ThreadSafeLayoutNode};
use gfx::display_list::OpaqueNode;
use gfx;
use libc::uintptr_t;
use script::dom::bindings::js::JS;
use script::dom::bindings::utils::Reflectable;
use script::dom::node::{Node, SharedLayoutData};
use script::layout_interface::{LayoutChan, UntrustedNodeAddress, TrustedNodeAddress};
use std::mem;
use std::cell::{Ref, RefMut};
use style::ComputedValues;
use style;
use sync::Arc;
/// Data that layout associates with a node.
pub struct PrivateLayoutData {
/// The results of CSS styling for this node's `before` pseudo-element, if any.
pub before_style: Option<Arc<ComputedValues>>,
/// The results of CSS styling for this node's `after` pseudo-element, if any.
pub after_style: Option<Arc<ComputedValues>>,
/// Description of how to account for recent style changes.
pub restyle_damage: Option<RestyleDamage>,
/// The current results of flow construction for this node. This is either a flow or a
/// `ConstructionItem`. See comments in `construct.rs` for more details.
pub flow_construction_result: ConstructionResult,
pub before_flow_construction_result: ConstructionResult,
pub after_flow_construction_result: ConstructionResult,
/// Information needed during parallel traversals.
pub parallel: DomParallelInfo,
}
impl PrivateLayoutData {
/// Creates new layout data.
pub fn new() -> PrivateLayoutData {
PrivateLayoutData {
before_style: None,
after_style: None,
restyle_damage: None,
flow_construction_result: NoConstructionResult,
before_flow_construction_result: NoConstructionResult,
after_flow_construction_result: NoConstructionResult,
parallel: DomParallelInfo::new(),
}
}
}
pub struct LayoutDataWrapper {
pub chan: Option<LayoutChan>,
pub shared_data: SharedLayoutData,
pub data: Box<PrivateLayoutData>,
}
/// A trait that allows access to the layout data of a DOM node.
pub trait LayoutDataAccess {
/// Borrows the layout data without checks.
unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper>;
/// Borrows the layout data immutably. Fails on a conflicting borrow.
fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>>;
/// Borrows the layout data mutably. Fails on a conflicting borrow.
fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>>;
}
impl<'ln> LayoutDataAccess for LayoutNode<'ln> {
#[inline(always)]
unsafe fn borrow_layout_data_unchecked(&self) -> *const Option<LayoutDataWrapper> {
mem::transmute(self.get().layout_data.borrow_unchecked())
}
#[inline(always)]
fn borrow_layout_data<'a>(&'a self) -> Ref<'a,Option<LayoutDataWrapper>> {
unsafe {
mem::transmute(self.get().layout_data.borrow())
}
}
#[inline(always)]
fn mutate_layout_data<'a>(&'a self) -> RefMut<'a,Option<LayoutDataWrapper>> {
unsafe {
mem::transmute(self.get().layout_data.borrow_mut())
}
}
}
pub trait OpaqueNodeMethods {
/// Converts a DOM node (layout view) to an `OpaqueNode`.
fn from_layout_node(node: &LayoutNode) -> Self;
/// Converts a thread-safe DOM node (layout view) to an `OpaqueNode`.
fn from_thread_safe_layout_node(node: &ThreadSafeLayoutNode) -> Self;
/// Converts a DOM node (script view) to an `OpaqueNode`.
fn from_script_node(node: TrustedNodeAddress) -> Self;
/// Converts a DOM node to an `OpaqueNode'.
fn from_jsmanaged(node: &JS<Node>) -> Self;
/// Converts this node to an `UntrustedNodeAddress`. An `UntrustedNodeAddress` is just the type
/// of node that script expects to receive in a hit test.
fn to_untrusted_node_address(&self) -> UntrustedNodeAddress;
}
impl OpaqueNodeMethods for OpaqueNode {
fn from_layout_node(node: &LayoutNode) -> OpaqueNode {
unsafe {
OpaqueNodeMethods::from_jsmanaged(node.get_jsmanaged())
}
}
fn from_thread_safe_layout_node(node: &ThreadSafeLayoutNode) -> OpaqueNode {
unsafe {
let abstract_node = node.get_jsmanaged();
let ptr: uintptr_t = abstract_node.reflector().get_jsobject() as uint;
OpaqueNode(ptr)
}
}
fn from_script_node(node: TrustedNodeAddress) -> OpaqueNode {
unsafe {
OpaqueNodeMethods::from_jsmanaged(&JS::from_trusted_node_address(node))
}
}
fn from_jsmanaged(node: &JS<Node>) -> OpaqueNode {
unsafe {
let ptr: uintptr_t = mem::transmute(node.reflector().get_jsobject());
OpaqueNode(ptr)
}
}
fn to_untrusted_node_address(&self) -> UntrustedNodeAddress {
unsafe {
let OpaqueNode(addr) = *self;
let addr: UntrustedNodeAddress = mem::transmute(addr);
addr
}
}
}
/// Allows a CSS color to be converted into a graphics color.
pub trait ToGfxColor {
/// Converts a CSS color to a graphics color.
fn to_gfx_color(&self) -> gfx::color::Color;
}
impl ToGfxColor for style::computed_values::RGBA {
fn to_gfx_color(&self) -> gfx::color::Color {
gfx::color::rgba(self.red, self.green, self.blue, self.alpha)
}
}
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