mirror of
https://github.com/servo/servo.git
synced 2025-06-19 14:48:59 +01:00
645 lines
23 KiB
Rust
645 lines
23 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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use immeta::load_from_buf;
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use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
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use ipc_channel::router::ROUTER;
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use net_traits::{NetworkError, FetchResponseMsg};
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use net_traits::image::base::{Image, ImageMetadata, PixelFormat, load_from_memory};
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use net_traits::image_cache_thread::{ImageCacheCommand, ImageCacheThread, ImageState};
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use net_traits::image_cache_thread::{ImageOrMetadataAvailable, ImageResponse, UsePlaceholder};
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use net_traits::image_cache_thread::{ImageResponder, PendingImageId, CanRequestImages};
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use servo_config::resource_files::resources_dir_path;
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use servo_url::ServoUrl;
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use std::borrow::ToOwned;
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use std::collections::HashMap;
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use std::collections::hash_map::Entry::{Occupied, Vacant};
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use std::fs::File;
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use std::io::{self, Read};
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use std::mem;
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use std::sync::Arc;
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use std::sync::mpsc::{Receiver, Sender, channel};
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use std::thread;
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use threadpool::ThreadPool;
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use webrender_traits;
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///
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/// TODO(gw): Remaining work on image cache:
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/// * Make use of the prefetch support in various parts of the code.
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/// * Profile time in GetImageIfAvailable - might be worth caching these results per paint / layout thread.
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///
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/// MAYBE(Yoric):
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/// * For faster lookups, it might be useful to store the LoadKey in the DOM once we have performed a first load.
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// TODO(gw): This is a port of the old is_image_opaque code from WR.
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// Consider using SIMD to speed this up if it shows in profiles.
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fn is_image_opaque(format: webrender_traits::ImageFormat, bytes: &[u8]) -> bool {
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match format {
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webrender_traits::ImageFormat::RGBA8 => {
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let mut is_opaque = true;
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for i in 0..(bytes.len() / 4) {
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if bytes[i * 4 + 3] != 255 {
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is_opaque = false;
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break;
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}
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}
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is_opaque
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}
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webrender_traits::ImageFormat::RGB8 => true,
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webrender_traits::ImageFormat::A8 => false,
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webrender_traits::ImageFormat::Invalid | webrender_traits::ImageFormat::RGBAF32 => unreachable!(),
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}
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}
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/// Represents an image that is either being loaded
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/// by the resource thread, or decoded by a worker thread.
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struct PendingLoad {
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// The bytes loaded so far. Reset to an empty vector once loading
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// is complete and the buffer has been transmitted to the decoder.
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bytes: ImageBytes,
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// Image metadata, if available.
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metadata: Option<ImageMetadata>,
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// Once loading is complete, the result of the operation.
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result: Option<Result<(), NetworkError>>,
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listeners: Vec<ImageResponder>,
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// The url being loaded. Do not forget that this may be several Mb
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// if we are loading a data: url.
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url: ServoUrl,
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}
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enum ImageBytes {
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InProgress(Vec<u8>),
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Complete(Arc<Vec<u8>>),
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}
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impl ImageBytes {
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fn extend_from_slice(&mut self, data: &[u8]) {
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match *self {
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ImageBytes::InProgress(ref mut bytes) => bytes.extend_from_slice(data),
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ImageBytes::Complete(_) => panic!("attempted modification of complete image bytes"),
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}
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}
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fn mark_complete(&mut self) -> Arc<Vec<u8>> {
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let bytes = {
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let own_bytes = match *self {
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ImageBytes::InProgress(ref mut bytes) => bytes,
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ImageBytes::Complete(_) => panic!("attempted modification of complete image bytes"),
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};
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mem::replace(own_bytes, vec![])
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};
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let bytes = Arc::new(bytes);
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*self = ImageBytes::Complete(bytes.clone());
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bytes
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}
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fn as_slice(&self) -> &[u8] {
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match *self {
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ImageBytes::InProgress(ref bytes) => &bytes,
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ImageBytes::Complete(ref bytes) => &*bytes,
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}
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}
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}
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enum LoadResult {
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Loaded(Image),
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PlaceholderLoaded(Arc<Image>),
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None
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}
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impl PendingLoad {
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fn new(url: ServoUrl) -> PendingLoad {
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PendingLoad {
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bytes: ImageBytes::InProgress(vec!()),
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metadata: None,
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result: None,
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listeners: vec!(),
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url: url,
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}
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}
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fn add_listener(&mut self, listener: ImageResponder) {
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self.listeners.push(listener);
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}
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}
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// Represents all the currently pending loads/decodings. For
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// performance reasons, loads are indexed by a dedicated load key.
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struct AllPendingLoads {
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// The loads, indexed by a load key. Used during most operations,
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// for performance reasons.
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loads: HashMap<LoadKey, PendingLoad>,
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// Get a load key from its url. Used ony when starting and
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// finishing a load or when adding a new listener.
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url_to_load_key: HashMap<ServoUrl, LoadKey>,
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// A counter used to generate instances of LoadKey
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keygen: LoadKeyGenerator,
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}
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/// Result of accessing a cache.
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enum CacheResult<'a> {
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/// The value was in the cache.
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Hit(LoadKey, &'a mut PendingLoad),
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/// The value was not in the cache and needed to be regenerated.
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Miss(Option<(LoadKey, &'a mut PendingLoad)>),
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}
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impl AllPendingLoads {
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fn new() -> AllPendingLoads {
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AllPendingLoads {
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loads: HashMap::new(),
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url_to_load_key: HashMap::new(),
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keygen: LoadKeyGenerator::new(),
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}
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}
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// `true` if there is no currently pending load, `false` otherwise.
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fn is_empty(&self) -> bool {
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assert!(self.loads.is_empty() == self.url_to_load_key.is_empty());
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self.loads.is_empty()
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}
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// get a PendingLoad from its LoadKey.
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fn get_by_key_mut(&mut self, key: &LoadKey) -> Option<&mut PendingLoad> {
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self.loads.get_mut(key)
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}
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fn remove(&mut self, key: &LoadKey) -> Option<PendingLoad> {
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self.loads.remove(key).
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and_then(|pending_load| {
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self.url_to_load_key.remove(&pending_load.url).unwrap();
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Some(pending_load)
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})
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}
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fn get_cached<'a>(&'a mut self, url: ServoUrl, can_request: CanRequestImages)
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-> CacheResult<'a> {
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match self.url_to_load_key.entry(url.clone()) {
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Occupied(url_entry) => {
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let load_key = url_entry.get();
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CacheResult::Hit(*load_key, self.loads.get_mut(load_key).unwrap())
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}
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Vacant(url_entry) => {
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if can_request == CanRequestImages::No {
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return CacheResult::Miss(None);
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}
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let load_key = self.keygen.next();
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url_entry.insert(load_key);
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let pending_load = PendingLoad::new(url);
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match self.loads.entry(load_key) {
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Occupied(_) => unreachable!(),
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Vacant(load_entry) => {
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let mut_load = load_entry.insert(pending_load);
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CacheResult::Miss(Some((load_key, mut_load)))
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}
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}
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}
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}
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}
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}
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/// Represents an image that has completed loading.
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/// Images that fail to load (due to network or decode
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/// failure) are still stored here, so that they aren't
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/// fetched again.
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struct CompletedLoad {
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image_response: ImageResponse,
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id: PendingImageId,
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}
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impl CompletedLoad {
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fn new(image_response: ImageResponse, id: PendingImageId) -> CompletedLoad {
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CompletedLoad {
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image_response: image_response,
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id: id,
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}
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}
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}
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// A key used to communicate during loading.
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type LoadKey = PendingImageId;
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struct LoadKeyGenerator {
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counter: u64
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}
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impl LoadKeyGenerator {
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fn new() -> LoadKeyGenerator {
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LoadKeyGenerator {
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counter: 0
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}
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}
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fn next(&mut self) -> PendingImageId {
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self.counter += 1;
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PendingImageId(self.counter)
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}
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}
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struct ResourceLoadInfo {
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action: FetchResponseMsg,
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key: LoadKey,
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}
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/// Implementation of the image cache
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struct ImageCache {
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decoder_sender: Sender<DecoderMsg>,
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// Worker threads for decoding images.
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thread_pool: ThreadPool,
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// Images that are loading over network, or decoding.
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pending_loads: AllPendingLoads,
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// Images that have finished loading (successful or not)
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completed_loads: HashMap<ServoUrl, CompletedLoad>,
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// The placeholder image used when an image fails to load
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placeholder_image: Option<Arc<Image>>,
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// Webrender API instance.
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webrender_api: webrender_traits::RenderApi,
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}
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/// Message that the decoder worker threads send to main image cache thread.
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struct DecoderMsg {
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key: LoadKey,
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image: Option<Image>,
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}
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struct Receivers {
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cmd_receiver: Receiver<ImageCacheCommand>,
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decoder_receiver: Receiver<DecoderMsg>,
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}
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impl Receivers {
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#[allow(unsafe_code)]
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fn recv(&self) -> SelectResult {
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let cmd_receiver = &self.cmd_receiver;
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let decoder_receiver = &self.decoder_receiver;
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select! {
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msg = cmd_receiver.recv() => {
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SelectResult::Command(msg.unwrap())
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},
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msg = decoder_receiver.recv() => {
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SelectResult::Decoder(msg.unwrap())
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}
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}
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}
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}
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/// The types of messages that the main image cache thread receives.
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enum SelectResult {
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Command(ImageCacheCommand),
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Decoder(DecoderMsg),
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}
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fn convert_format(format: PixelFormat) -> webrender_traits::ImageFormat {
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match format {
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PixelFormat::K8 | PixelFormat::KA8 => {
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panic!("Not support by webrender yet");
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}
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PixelFormat::RGB8 => webrender_traits::ImageFormat::RGB8,
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PixelFormat::RGBA8 => webrender_traits::ImageFormat::RGBA8,
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}
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}
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fn get_placeholder_image(webrender_api: &webrender_traits::RenderApi) -> io::Result<Arc<Image>> {
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let mut placeholder_path = try!(resources_dir_path());
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placeholder_path.push("rippy.png");
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let mut file = try!(File::open(&placeholder_path));
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let mut image_data = vec![];
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try!(file.read_to_end(&mut image_data));
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let mut image = load_from_memory(&image_data).unwrap();
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let format = convert_format(image.format);
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let mut bytes = Vec::new();
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bytes.extend_from_slice(&*image.bytes);
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let descriptor = webrender_traits::ImageDescriptor {
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width: image.width,
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height: image.height,
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stride: None,
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format: format,
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offset: 0,
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is_opaque: is_image_opaque(format, &bytes),
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};
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let data = webrender_traits::ImageData::new(bytes);
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let image_key = webrender_api.generate_image_key();
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webrender_api.add_image(image_key, descriptor, data, None);
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image.id = Some(image_key);
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Ok(Arc::new(image))
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}
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fn premultiply(data: &mut [u8]) {
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let length = data.len();
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for i in (0..length).step_by(4) {
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let b = data[i + 0] as u32;
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let g = data[i + 1] as u32;
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let r = data[i + 2] as u32;
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let a = data[i + 3] as u32;
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data[i + 0] = (b * a / 255) as u8;
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data[i + 1] = (g * a / 255) as u8;
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data[i + 2] = (r * a / 255) as u8;
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}
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}
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impl ImageCache {
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fn run(webrender_api: webrender_traits::RenderApi,
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ipc_command_receiver: IpcReceiver<ImageCacheCommand>) {
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// Preload the placeholder image, used when images fail to load.
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let placeholder_image = get_placeholder_image(&webrender_api).ok();
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// Ask the router to proxy messages received over IPC to us.
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let cmd_receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_command_receiver);
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let (decoder_sender, decoder_receiver) = channel();
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let mut cache = ImageCache {
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decoder_sender: decoder_sender,
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thread_pool: ThreadPool::new(4),
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pending_loads: AllPendingLoads::new(),
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completed_loads: HashMap::new(),
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placeholder_image: placeholder_image,
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webrender_api: webrender_api,
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};
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let receivers = Receivers {
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cmd_receiver: cmd_receiver,
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decoder_receiver: decoder_receiver,
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};
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let mut exit_sender: Option<IpcSender<()>> = None;
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loop {
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match receivers.recv() {
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SelectResult::Command(cmd) => {
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exit_sender = cache.handle_cmd(cmd);
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}
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SelectResult::Decoder(msg) => {
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cache.handle_decoder(msg);
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}
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}
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// Can only exit when all pending loads are complete.
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if let Some(ref exit_sender) = exit_sender {
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if cache.pending_loads.is_empty() {
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exit_sender.send(()).unwrap();
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break;
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}
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}
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}
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}
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// Handle a request from a client
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fn handle_cmd(&mut self, cmd: ImageCacheCommand) -> Option<IpcSender<()>> {
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match cmd {
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ImageCacheCommand::Exit(sender) => {
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return Some(sender);
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}
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ImageCacheCommand::AddListener(id, responder) => {
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self.add_listener(id, responder);
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}
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ImageCacheCommand::GetImageOrMetadataIfAvailable(url,
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use_placeholder,
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can_request,
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consumer) => {
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let result = self.get_image_or_meta_if_available(url, use_placeholder, can_request);
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// TODO(#15501): look for opportunities to clean up cache if this send fails.
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let _ = consumer.send(result);
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}
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ImageCacheCommand::StoreDecodeImage(id, data) => {
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self.handle_progress(ResourceLoadInfo {
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action: data,
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key: id
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});
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}
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};
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None
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}
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// Handle progress messages from the resource thread
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fn handle_progress(&mut self, msg: ResourceLoadInfo) {
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match (msg.action, msg.key) {
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(FetchResponseMsg::ProcessRequestBody, _) |
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(FetchResponseMsg::ProcessRequestEOF, _) => return,
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(FetchResponseMsg::ProcessResponse(_response), _) => {}
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(FetchResponseMsg::ProcessResponseChunk(data), _) => {
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debug!("got some data for {:?}", msg.key);
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let pending_load = self.pending_loads.get_by_key_mut(&msg.key).unwrap();
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pending_load.bytes.extend_from_slice(&data);
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//jmr0 TODO: possibly move to another task?
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if let None = pending_load.metadata {
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if let Ok(metadata) = load_from_buf(&pending_load.bytes.as_slice()) {
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let dimensions = metadata.dimensions();
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let img_metadata = ImageMetadata { width: dimensions.width,
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height: dimensions.height };
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for listener in &pending_load.listeners {
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listener.respond(ImageResponse::MetadataLoaded(img_metadata.clone()));
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}
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pending_load.metadata = Some(img_metadata);
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}
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}
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}
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(FetchResponseMsg::ProcessResponseEOF(result), key) => {
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debug!("received EOF for {:?}", key);
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match result {
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Ok(()) => {
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let pending_load = self.pending_loads.get_by_key_mut(&msg.key).unwrap();
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pending_load.result = Some(result);
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let bytes = pending_load.bytes.mark_complete();
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let sender = self.decoder_sender.clone();
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debug!("async decoding {} ({:?})", pending_load.url, key);
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self.thread_pool.execute(move || {
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let msg = decode_bytes_sync(key, &*bytes);
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sender.send(msg).unwrap();
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});
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}
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Err(_) => {
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debug!("processing error for {:?}", key);
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match self.placeholder_image.clone() {
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Some(placeholder_image) => {
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self.complete_load(msg.key, LoadResult::PlaceholderLoaded(
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placeholder_image))
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}
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None => self.complete_load(msg.key, LoadResult::None),
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}
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}
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}
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}
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}
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}
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// Handle a message from one of the decoder worker threads
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fn handle_decoder(&mut self, msg: DecoderMsg) {
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let image = match msg.image {
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None => LoadResult::None,
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Some(image) => LoadResult::Loaded(image),
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};
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self.complete_load(msg.key, image);
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}
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// Change state of a url from pending -> loaded.
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fn complete_load(&mut self, key: LoadKey, mut load_result: LoadResult) {
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let pending_load = match self.pending_loads.remove(&key) {
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Some(load) => load,
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None => return,
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};
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match load_result {
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LoadResult::Loaded(ref mut image) => {
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let format = convert_format(image.format);
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let mut bytes = Vec::new();
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bytes.extend_from_slice(&*image.bytes);
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if format == webrender_traits::ImageFormat::RGBA8 {
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premultiply(bytes.as_mut_slice());
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}
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let descriptor = webrender_traits::ImageDescriptor {
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width: image.width,
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height: image.height,
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stride: None,
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format: format,
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offset: 0,
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is_opaque: is_image_opaque(format, &bytes),
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};
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let data = webrender_traits::ImageData::new(bytes);
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let image_key = self.webrender_api.generate_image_key();
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self.webrender_api.add_image(image_key, descriptor, data, None);
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image.id = Some(image_key);
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}
|
|
LoadResult::PlaceholderLoaded(..) | LoadResult::None => {}
|
|
}
|
|
|
|
let image_response = match load_result {
|
|
LoadResult::Loaded(image) => ImageResponse::Loaded(Arc::new(image)),
|
|
LoadResult::PlaceholderLoaded(image) => ImageResponse::PlaceholderLoaded(image),
|
|
LoadResult::None => ImageResponse::None,
|
|
};
|
|
|
|
let completed_load = CompletedLoad::new(image_response.clone(), key);
|
|
self.completed_loads.insert(pending_load.url.into(), completed_load);
|
|
|
|
for listener in pending_load.listeners {
|
|
listener.respond(image_response.clone());
|
|
}
|
|
}
|
|
|
|
/// Add a listener for a given image if it is still pending, or notify the
|
|
/// listener if the image is complete.
|
|
fn add_listener(&mut self,
|
|
id: PendingImageId,
|
|
listener: ImageResponder) {
|
|
if let Some(load) = self.pending_loads.get_by_key_mut(&id) {
|
|
if let Some(ref metadata) = load.metadata {
|
|
listener.respond(ImageResponse::MetadataLoaded(metadata.clone()));
|
|
}
|
|
load.add_listener(listener);
|
|
return;
|
|
}
|
|
if let Some(load) = self.completed_loads.values().find(|l| l.id == id) {
|
|
listener.respond(load.image_response.clone());
|
|
return;
|
|
}
|
|
warn!("Couldn't find cached entry for listener {:?}", id);
|
|
}
|
|
|
|
/// Return a completed image if it exists, or None if there is no complete load
|
|
/// or the complete load is not fully decoded or is unavailable.
|
|
fn get_completed_image_if_available(&self,
|
|
url: &ServoUrl,
|
|
placeholder: UsePlaceholder)
|
|
-> Option<Result<ImageOrMetadataAvailable, ImageState>> {
|
|
self.completed_loads.get(url).map(|completed_load| {
|
|
match (&completed_load.image_response, placeholder) {
|
|
(&ImageResponse::Loaded(ref image), _) |
|
|
(&ImageResponse::PlaceholderLoaded(ref image), UsePlaceholder::Yes) => {
|
|
Ok(ImageOrMetadataAvailable::ImageAvailable(image.clone()))
|
|
}
|
|
(&ImageResponse::PlaceholderLoaded(_), UsePlaceholder::No) |
|
|
(&ImageResponse::None, _) |
|
|
(&ImageResponse::MetadataLoaded(_), _) => {
|
|
Err(ImageState::LoadError)
|
|
}
|
|
}
|
|
})
|
|
}
|
|
|
|
/// Return any available metadata or image for the given URL, or an indication that
|
|
/// the image is not yet available if it is in progress, or else reserve a slot in
|
|
/// the cache for the URL if the consumer can request images.
|
|
fn get_image_or_meta_if_available(&mut self,
|
|
url: ServoUrl,
|
|
placeholder: UsePlaceholder,
|
|
can_request: CanRequestImages)
|
|
-> Result<ImageOrMetadataAvailable, ImageState> {
|
|
if let Some(result) = self.get_completed_image_if_available(&url, placeholder) {
|
|
debug!("{} is available", url);
|
|
return result;
|
|
}
|
|
|
|
let decoded = {
|
|
let result = self.pending_loads.get_cached(url.clone(), can_request);
|
|
match result {
|
|
CacheResult::Hit(key, pl) => match (&pl.result, &pl.metadata) {
|
|
(&Some(Ok(_)), _) => {
|
|
debug!("sync decoding {} ({:?})", url, key);
|
|
decode_bytes_sync(key, &pl.bytes.as_slice())
|
|
}
|
|
(&None, &Some(ref meta)) => {
|
|
debug!("metadata available for {} ({:?})", url, key);
|
|
return Ok(ImageOrMetadataAvailable::MetadataAvailable(meta.clone()))
|
|
}
|
|
(&Some(Err(_)), _) | (&None, &None) => {
|
|
debug!("{} ({:?}) is still pending", url, key);
|
|
return Err(ImageState::Pending(key));
|
|
}
|
|
},
|
|
CacheResult::Miss(Some((key, _pl))) => {
|
|
debug!("should be requesting {} ({:?})", url, key);
|
|
return Err(ImageState::NotRequested(key));
|
|
}
|
|
CacheResult::Miss(None) => {
|
|
debug!("couldn't find an entry for {}", url);
|
|
return Err(ImageState::LoadError);
|
|
}
|
|
}
|
|
};
|
|
|
|
// In the case where a decode is ongoing (or waiting in a queue) but we have the
|
|
// full response available, we decode the bytes synchronously and ignore the
|
|
// async decode when it finishes later.
|
|
// TODO: make this behaviour configurable according to the caller's needs.
|
|
self.handle_decoder(decoded);
|
|
match self.get_completed_image_if_available(&url, placeholder) {
|
|
Some(result) => result,
|
|
None => Err(ImageState::LoadError),
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Create a new image cache.
|
|
pub fn new_image_cache_thread(webrender_api: webrender_traits::RenderApi) -> ImageCacheThread {
|
|
let (ipc_command_sender, ipc_command_receiver) = ipc::channel().unwrap();
|
|
|
|
thread::Builder::new().name("ImageCacheThread".to_owned()).spawn(move || {
|
|
ImageCache::run(webrender_api, ipc_command_receiver)
|
|
}).expect("Thread spawning failed");
|
|
|
|
ImageCacheThread::new(ipc_command_sender)
|
|
}
|
|
|
|
fn decode_bytes_sync(key: LoadKey, bytes: &[u8]) -> DecoderMsg {
|
|
let image = load_from_memory(bytes);
|
|
DecoderMsg {
|
|
key: key,
|
|
image: image
|
|
}
|
|
}
|