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123 lines
3.8 KiB
Rust
123 lines
3.8 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Data needed by the layout task.
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use css::matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};
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use geom::{Rect, Size2D};
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use gfx::display_list::OpaqueNode;
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use gfx::font_context::FontContext;
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use gfx::font_cache_task::FontCacheTask;
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use script::layout_interface::LayoutChan;
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use servo_msg::constellation_msg::ConstellationChan;
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use servo_net::local_image_cache::LocalImageCache;
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use servo_util::geometry::Au;
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use servo_util::opts::Opts;
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use sync::{Arc, Mutex};
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use std::mem;
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use style::Stylist;
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use url::Url;
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struct LocalLayoutContext {
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font_context: FontContext,
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applicable_declarations_cache: ApplicableDeclarationsCache,
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style_sharing_candidate_cache: StyleSharingCandidateCache,
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}
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local_data_key!(local_context_key: *mut LocalLayoutContext)
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fn create_or_get_local_context(shared_layout_context: &SharedLayoutContext) -> *mut LocalLayoutContext {
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let maybe_context = local_context_key.get();
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let context = match maybe_context {
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None => {
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let context = box LocalLayoutContext {
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font_context: FontContext::new(shared_layout_context.font_cache_task.clone()),
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applicable_declarations_cache: ApplicableDeclarationsCache::new(),
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style_sharing_candidate_cache: StyleSharingCandidateCache::new(),
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};
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local_context_key.replace(Some(unsafe { mem::transmute(context) }));
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local_context_key.get().unwrap()
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},
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Some(context) => context
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};
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*context
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}
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pub struct SharedLayoutContext {
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/// The local image cache.
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pub image_cache: Arc<Mutex<LocalImageCache>>,
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/// The current screen size.
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pub screen_size: Size2D<Au>,
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/// A channel up to the constellation.
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pub constellation_chan: ConstellationChan,
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/// A channel up to the layout task.
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pub layout_chan: LayoutChan,
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/// Interface to the font cache task.
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pub font_cache_task: FontCacheTask,
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/// The CSS selector stylist.
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///
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/// FIXME(#2604): Make this no longer an unsafe pointer once we have fast `RWArc`s.
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pub stylist: *const Stylist,
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/// The root node at which we're starting the layout.
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pub reflow_root: OpaqueNode,
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/// The URL.
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pub url: Url,
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/// The command line options.
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pub opts: Opts,
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/// The dirty rectangle, used during display list building.
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pub dirty: Rect<Au>,
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}
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pub struct LayoutContext<'a> {
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pub shared: &'a SharedLayoutContext,
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cached_local_layout_context: *mut LocalLayoutContext,
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}
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impl<'a> LayoutContext<'a> {
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pub fn new(shared_layout_context: &'a SharedLayoutContext) -> LayoutContext<'a> {
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let local_context = create_or_get_local_context(shared_layout_context);
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LayoutContext {
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shared: shared_layout_context,
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cached_local_layout_context: local_context,
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}
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}
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#[inline(always)]
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pub fn font_context<'a>(&'a self) -> &'a mut FontContext {
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unsafe {
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let cached_context = &*self.cached_local_layout_context;
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mem::transmute(&cached_context.font_context)
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}
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}
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#[inline(always)]
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pub fn applicable_declarations_cache<'a>(&'a self) -> &'a mut ApplicableDeclarationsCache {
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unsafe {
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let cached_context = &*self.cached_local_layout_context;
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mem::transmute(&cached_context.applicable_declarations_cache)
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}
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}
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#[inline(always)]
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pub fn style_sharing_candidate_cache<'a>(&'a self) -> &'a mut StyleSharingCandidateCache {
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unsafe {
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let cached_context = &*self.cached_local_layout_context;
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mem::transmute(&cached_context.style_sharing_candidate_cache)
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}
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}
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}
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