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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 https://mozilla.org/MPL/2.0/. */
use crate::display_list::WebRenderImageInfo;
use fnv::FnvHashMap;
use gfx::font_cache_thread::FontCacheThread;
use gfx::font_context::FontContext;
use msg::constellation_msg::PipelineId;
use net_traits::image_cache::{CanRequestImages, ImageCache, ImageState};
use net_traits::image_cache::{ImageOrMetadataAvailable, UsePlaceholder};
use parking_lot::RwLock;
use script_layout_interface::{PendingImage, PendingImageState};
use servo_url::{ImmutableOrigin, ServoUrl};
use std::cell::RefCell;
use std::sync::{Arc, Mutex};
use style::context::SharedStyleContext;
use style::dom::OpaqueNode;
pub struct LayoutContext<'a> {
pub id: PipelineId,
pub use_rayon: bool,
pub origin: ImmutableOrigin,
/// Bits shared by the layout and style system.
pub style_context: SharedStyleContext<'a>,
/// Interface to the font cache thread.
pub font_cache_thread: Mutex<FontCacheThread>,
/// Reference to the script thread image cache.
pub image_cache: Arc<dyn ImageCache>,
/// A list of in-progress image loads to be shared with the script thread.
/// A None value means that this layout was not initiated by the script thread.
pub pending_images: Option<Mutex<Vec<PendingImage>>>,
pub webrender_image_cache:
Arc<RwLock<FnvHashMap<(ServoUrl, UsePlaceholder), WebRenderImageInfo>>>,
}
impl<'a> Drop for LayoutContext<'a> {
fn drop(&mut self) {
if !std::thread::panicking() {
if let Some(ref pending_images) = self.pending_images {
assert!(pending_images.lock().unwrap().is_empty());
}
}
}
}
impl<'a> LayoutContext<'a> {
#[inline(always)]
pub fn shared_context(&self) -> &SharedStyleContext {
&self.style_context
}
pub fn get_or_request_image_or_meta(
&self,
node: OpaqueNode,
url: ServoUrl,
use_placeholder: UsePlaceholder,
) -> Option<ImageOrMetadataAvailable> {
//XXXjdm For cases where we do not request an image, we still need to
// ensure the node gets another script-initiated reflow or it
// won't be requested at all.
let can_request = if self.pending_images.is_some() {
CanRequestImages::Yes
} else {
CanRequestImages::No
};
// See if the image is already available
let result = self.image_cache.find_image_or_metadata(
url.clone(),
self.origin.clone(),
None,
use_placeholder,
can_request,
);
match result {
Ok(image_or_metadata) => Some(image_or_metadata),
// Image failed to load, so just return nothing
Err(ImageState::LoadError) => None,
// Not yet requested - request image or metadata from the cache
Err(ImageState::NotRequested(id)) => {
let image = PendingImage {
state: PendingImageState::Unrequested(url),
node: node.into(),
id: id,
origin: self.origin.clone(),
};
self.pending_images
.as_ref()
.unwrap()
.lock()
.unwrap()
.push(image);
None
},
// Image has been requested, is still pending. Return no image for this paint loop.
// When the image loads it will trigger a reflow and/or repaint.
Err(ImageState::Pending(id)) => {
//XXXjdm if self.pending_images is not available, we should make sure that
// this node gets marked dirty again so it gets a script-initiated
// reflow that deals with this properly.
if let Some(ref pending_images) = self.pending_images {
let image = PendingImage {
state: PendingImageState::PendingResponse,
node: node.into(),
id: id,
origin: self.origin.clone(),
};
pending_images.lock().unwrap().push(image);
}
None
},
}
}
pub fn get_webrender_image_for_url(
&self,
node: OpaqueNode,
url: ServoUrl,
use_placeholder: UsePlaceholder,
) -> Option<WebRenderImageInfo> {
if let Some(existing_webrender_image) = self
.webrender_image_cache
.read()
.get(&(url.clone(), use_placeholder))
{
return Some((*existing_webrender_image).clone());
}
match self.get_or_request_image_or_meta(node, url.clone(), use_placeholder) {
Some(ImageOrMetadataAvailable::ImageAvailable(image, _)) => {
let image_info = WebRenderImageInfo {
width: image.width,
height: image.height,
key: image.id,
};
if image_info.key.is_none() {
Some(image_info)
} else {
let mut webrender_image_cache = self.webrender_image_cache.write();
webrender_image_cache.insert((url, use_placeholder), image_info);
Some(image_info)
}
},
None | Some(ImageOrMetadataAvailable::MetadataAvailable(_)) => None,
}
}
}
pub(crate) type LayoutFontContext = FontContext<FontCacheThread>;
thread_local!(static FONT_CONTEXT: RefCell<Option<LayoutFontContext>> = RefCell::new(None));
pub(crate) fn with_thread_local_font_context<F, R>(layout_context: &LayoutContext, f: F) -> R
where
F: FnOnce(&mut LayoutFontContext) -> R,
{
FONT_CONTEXT.with(|font_context| {
f(font_context.borrow_mut().get_or_insert_with(|| {
FontContext::new(layout_context.font_cache_thread.lock().unwrap().clone())
}))
})
}
|
