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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 std::sync::Arc;
use base::id::PipelineId;
use fnv::FnvHashMap;
use fonts::FontContext;
use fxhash::FxHashMap;
use net_traits::image_cache::{
ImageCache, ImageCacheResult, ImageOrMetadataAvailable, UsePlaceholder,
};
use parking_lot::{Mutex, RwLock};
use pixels::Image;
use script_layout_interface::{IFrameSizes, ImageAnimationState, PendingImage, PendingImageState};
use servo_url::{ImmutableOrigin, ServoUrl};
use style::context::SharedStyleContext;
use style::dom::OpaqueNode;
use crate::display_list::WebRenderImageInfo;
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>,
/// A FontContext to be used during layout.
pub font_context: Arc<FontContext>,
/// 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.
pub pending_images: Mutex<Vec<PendingImage>>,
/// A collection of `<iframe>` sizes to send back to script.
pub iframe_sizes: Mutex<IFrameSizes>,
pub webrender_image_cache:
Arc<RwLock<FnvHashMap<(ServoUrl, UsePlaceholder), WebRenderImageInfo>>>,
pub node_image_animation_map: Arc<RwLock<FxHashMap<OpaqueNode, ImageAnimationState>>>,
}
impl Drop for LayoutContext<'_> {
fn drop(&mut self) {
if !std::thread::panicking() {
assert!(self.pending_images.lock().is_empty());
}
}
}
impl LayoutContext<'_> {
#[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> {
// Check for available image or start tracking.
let cache_result = self.image_cache.get_cached_image_status(
url.clone(),
self.origin.clone(),
None,
use_placeholder,
);
match cache_result {
ImageCacheResult::Available(img_or_meta) => Some(img_or_meta),
// 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.
ImageCacheResult::Pending(id) => {
let image = PendingImage {
state: PendingImageState::PendingResponse,
node: node.into(),
id,
origin: self.origin.clone(),
};
self.pending_images.lock().push(image);
None
},
// Not yet requested - request image or metadata from the cache
ImageCacheResult::ReadyForRequest(id) => {
let image = PendingImage {
state: PendingImageState::Unrequested(url),
node: node.into(),
id,
origin: self.origin.clone(),
};
self.pending_images.lock().push(image);
None
},
// Image failed to load, so just return nothing
ImageCacheResult::LoadError => None,
}
}
pub fn handle_animated_image(&self, node: OpaqueNode, image: Arc<Image>) {
let mut store = self.node_image_animation_map.write();
// 1. first check whether node previously being track for animated image.
if let Some(image_state) = store.get(&node) {
// a. if the node is not containing the same image as before.
if image_state.image_key() != image.id {
if image.should_animate() {
// i. Register/Replace tracking item in image_animation_manager.
store.insert(node, ImageAnimationState::new(image));
} else {
// ii. Cancel Action if the node's image is no longer animated.
store.remove(&node);
}
}
} else if image.should_animate() {
store.insert(node, ImageAnimationState::new(image));
}
}
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);
}
match self.get_or_request_image_or_meta(node, url.clone(), use_placeholder) {
Some(ImageOrMetadataAvailable::ImageAvailable { image, .. }) => {
self.handle_animated_image(node, image.clone());
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,
}
}
}
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