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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/. */
//! Data needed by the layout task.
use css::matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
use geom::rect::Rect;
use geom::size::Size2D;
use gfx::display_list::OpaqueNode;
use gfx::font_context::FontContext;
use gfx::font_cache_task::FontCacheTask;
#[cfg(not(target_os="android"))]
use green::task::GreenTask;
use script::layout_interface::LayoutChan;
use servo_msg::constellation_msg::ConstellationChan;
use servo_net::local_image_cache::LocalImageCache;
use servo_util::geometry::Au;
use servo_util::opts::Opts;
use sync::{Arc, Mutex};
use std::mem;
#[cfg(not(target_os="android"))]
use std::ptr;
#[cfg(not(target_os="android"))]
use std::rt::local::Local;
#[cfg(not(target_os="android"))]
use std::rt::task::Task;
use style::Stylist;
use url::Url;
#[cfg(not(target_os="android"))]
#[thread_local]
static mut FONT_CONTEXT: *mut FontContext = 0 as *mut FontContext;
#[cfg(target_os="android")]
local_data_key!(font_context: *mut FontContext)
#[cfg(not(target_os="android"))]
#[thread_local]
static mut APPLICABLE_DECLARATIONS_CACHE: *mut ApplicableDeclarationsCache =
0 as *mut ApplicableDeclarationsCache;
#[cfg(target_os="android")]
local_data_key!(applicable_declarations_cache: *mut ApplicableDeclarationsCache)
#[cfg(not(target_os="android"))]
#[thread_local]
static mut STYLE_SHARING_CANDIDATE_CACHE: *mut StyleSharingCandidateCache =
0 as *mut StyleSharingCandidateCache;
#[cfg(target_os="android")]
local_data_key!(style_sharing_candidate_cache: *mut StyleSharingCandidateCache)
/// Data shared by all layout workers.
#[allow(raw_pointer_deriving)]
#[deriving(Clone)]
pub struct LayoutContext {
/// The local image cache.
pub image_cache: Arc<Mutex<LocalImageCache>>,
/// The current screen size.
pub screen_size: Size2D<Au>,
/// A channel up to the constellation.
pub constellation_chan: ConstellationChan,
/// A channel up to the layout task.
pub layout_chan: LayoutChan,
/// Interface to the font cache task.
pub font_cache_task: FontCacheTask,
/// The CSS selector stylist.
///
/// FIXME(#2604): Make this no longer an unsafe pointer once we have fast `RWArc`s.
pub stylist: *Stylist,
/// The root node at which we're starting the layout.
pub reflow_root: OpaqueNode,
/// The URL.
pub url: Url,
/// The command line options.
pub opts: Opts,
/// The dirty rectangle, used during display list building.
pub dirty: Rect<Au>,
}
#[cfg(not(target_os="android"))]
impl LayoutContext {
pub fn font_context<'a>(&'a mut self) -> &'a mut FontContext {
// Sanity check.
{
let mut task = Local::borrow(None::<Task>);
match task.maybe_take_runtime::<GreenTask>() {
Some(green) => {
task.put_runtime(green);
fail!("can't call this on a green task!")
}
None => {}
}
}
unsafe {
if FONT_CONTEXT == ptr::mut_null() {
let context = box FontContext::new(self.font_cache_task.clone());
FONT_CONTEXT = mem::transmute(context)
}
mem::transmute(FONT_CONTEXT)
}
}
pub fn applicable_declarations_cache<'a>(&'a self) -> &'a mut ApplicableDeclarationsCache {
// Sanity check.
{
let mut task = Local::borrow(None::<Task>);
match task.maybe_take_runtime::<GreenTask>() {
Some(green) => {
task.put_runtime(green);
fail!("can't call this on a green task!")
}
None => {}
}
}
unsafe {
if APPLICABLE_DECLARATIONS_CACHE == ptr::mut_null() {
let cache = box ApplicableDeclarationsCache::new();
APPLICABLE_DECLARATIONS_CACHE = mem::transmute(cache)
}
mem::transmute(APPLICABLE_DECLARATIONS_CACHE)
}
}
pub fn style_sharing_candidate_cache<'a>(&'a self) -> &'a mut StyleSharingCandidateCache {
// Sanity check.
{
let mut task = Local::borrow(None::<Task>);
match task.maybe_take_runtime::<GreenTask>() {
Some(green) => {
task.put_runtime(green);
fail!("can't call this on a green task!")
}
None => {}
}
}
unsafe {
if STYLE_SHARING_CANDIDATE_CACHE == ptr::mut_null() {
let cache = box StyleSharingCandidateCache::new();
STYLE_SHARING_CANDIDATE_CACHE = mem::transmute(cache)
}
mem::transmute(STYLE_SHARING_CANDIDATE_CACHE)
}
}
}
// On Android, we don't have the __tls_* functions emitted by rustc, so we
// need to use the slower local_data functions.
// Making matters worse, the local_data functions are very particular about
// enforcing the lifetimes associated with objects that they hold onto,
// which causes us some trouble we work around as below.
#[cfg(target_os="android")]
impl LayoutContext {
pub fn font_context<'a>(&'a mut self) -> &'a mut FontContext {
unsafe {
let opt = font_context.replace(None);
let mut context;
match opt {
Some(c) => context = mem::transmute(c),
None => {
context = mem::transmute(box FontContext::new(self.font_cache_task.clone()))
}
}
font_context.replace(Some(context));
mem::transmute(context)
}
}
pub fn applicable_declarations_cache<'a>(&'a self) -> &'a mut ApplicableDeclarationsCache {
unsafe {
let opt = applicable_declarations_cache.replace(None);
let mut cache;
match opt {
Some(c) => cache = mem::transmute(c),
None => {
cache = mem::transmute(box ApplicableDeclarationsCache::new());
}
}
applicable_declarations_cache.replace(Some(cache));
mem::transmute(cache)
}
}
pub fn style_sharing_candidate_cache<'a>(&'a self) -> &'a mut StyleSharingCandidateCache {
unsafe {
let opt = style_sharing_candidate_cache.replace(None);
let mut cache;
match opt {
Some(c) => cache = mem::transmute(c),
None => {
cache = mem::transmute(box StyleSharingCandidateCache::new());
}
}
style_sharing_candidate_cache.replace(Some(cache));
mem::transmute(cache)
}
}
}
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