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Refactor ImageCache::find_image_or_metadata API.

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This commit is contained in:
Julien Tregoat 2019-06-28 22:37:59 -04:00 • committed by Josh Matthews
parent 7d1f968d52
commit 2742fd2bea
9 changed files with 266 additions and 227 deletions
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152
components/script/dom/htmlimageelement.rs
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@ -43,7 +43,7 @@ use crate::dom::values::UNSIGNED_LONG_MAX;
use crate::dom::virtualmethods::VirtualMethods;
use crate::dom::window::Window;
use crate::fetch::create_a_potential_cors_request;
use crate::image_listener::{add_cache_listener_for_element, ImageCacheListener};
use crate::image_listener::{generate_cache_listener_for_element, ImageCacheListener};
use crate::microtask::{Microtask, MicrotaskRunnable};
use crate::network_listener::{self, NetworkListener, PreInvoke, ResourceTimingListener};
use crate::script_thread::ScriptThread;
@ -54,13 +54,15 @@ use dom_struct::dom_struct;
use euclid::Point2D;
use html5ever::{LocalName, Prefix, QualName};
use ipc_channel::ipc;
use ipc_channel::ipc::IpcSender;
use ipc_channel::router::ROUTER;
use mime::{self, Mime};
use msg::constellation_msg::PipelineId;
use net_traits::image::base::{Image, ImageMetadata};
use net_traits::image_cache::UsePlaceholder;
use net_traits::image_cache::{CanRequestImages, CorsStatus, ImageCache, ImageOrMetadataAvailable};
use net_traits::image_cache::{ImageResponder, ImageResponse, ImageState, PendingImageId};
use net_traits::image_cache::{
CanRequestImages, CorsStatus, ImageCache, ImageCacheResult, ImageOrMetadataAvailable,
ImageResponse, PendingImageId, PendingImageResponse, UsePlaceholder,
};
use net_traits::request::{CorsSettings, Destination, Initiator, RequestBuilder};
use net_traits::{FetchMetadata, FetchResponseListener, FetchResponseMsg, NetworkError};
use net_traits::{ReferrerPolicy, ResourceFetchTiming, ResourceTimingType};
@ -317,35 +319,27 @@ impl HTMLImageElement {
fn fetch_image(&self, img_url: &ServoUrl) {
let window = window_from_node(self);
let image_cache = window.image_cache();
let response = image_cache.find_image_or_metadata(
img_url.clone().into(),
let sender = generate_cache_listener_for_element(self);
let cache_result = image_cache.track_image(
img_url.clone(),
window.origin().immutable().clone(),
cors_setting_for_element(self.upcast()),
sender,
UsePlaceholder::Yes,
CanRequestImages::Yes,
);
match response {
Ok(ImageOrMetadataAvailable::ImageAvailable(image, url)) => {
self.process_image_response(ImageResponse::Loaded(image, url));
},
Ok(ImageOrMetadataAvailable::MetadataAvailable(m)) => {
self.process_image_response(ImageResponse::MetadataLoaded(m));
match cache_result {
ImageCacheResult::Available(ImageOrMetadataAvailable::ImageAvailable(image, url)) => {
self.process_image_response(ImageResponse::Loaded(image, url))
},
Err(ImageState::Pending(id)) => {
add_cache_listener_for_element(image_cache, id, self);
ImageCacheResult::Available(ImageOrMetadataAvailable::MetadataAvailable(m)) => {
self.process_image_response(ImageResponse::MetadataLoaded(m))
},
Err(ImageState::LoadError) => {
self.process_image_response(ImageResponse::None);
},
Err(ImageState::NotRequested(id)) => {
add_cache_listener_for_element(image_cache, id, self);
self.fetch_request(img_url, id);
},
}
ImageCacheResult::Pending(_) => (),
ImageCacheResult::ReadyForRequest(id) => self.fetch_request(img_url, id),
ImageCacheResult::LoadError => self.process_image_response(ImageResponse::None),
};
}
fn fetch_request(&self, img_url: &ServoUrl, id: PendingImageId) {
@ -943,14 +937,13 @@ impl HTMLImageElement {
if let Some(src) = selected_source {
if let Ok(img_url) = base_url.join(&src) {
let image_cache = window.image_cache();
let response = image_cache.find_image_or_metadata(
img_url.clone().into(),
let response = image_cache.get_image(
img_url.clone(),
window.origin().immutable().clone(),
cors_setting_for_element(self.upcast()),
UsePlaceholder::No,
CanRequestImages::No,
);
if let Ok(ImageOrMetadataAvailable::ImageAvailable(image, url)) = response {
if let Some(image) = response {
// Cancel any outstanding tasks that were queued before the src was
// set on this element.
self.generation.set(self.generation.get() + 1);
@ -963,7 +956,7 @@ impl HTMLImageElement {
self.abort_request(State::CompletelyAvailable, ImageRequestPhase::Current);
self.abort_request(State::Unavailable, ImageRequestPhase::Pending);
let mut current_request = self.current_request.borrow_mut();
current_request.final_url = Some(url);
current_request.final_url = Some(img_url.clone());
current_request.image = Some(image.clone());
current_request.metadata = Some(metadata);
// Step 6.3.6
@ -1010,13 +1003,12 @@ impl HTMLImageElement {
/// Step 2-12 of https://html.spec.whatwg.org/multipage/#img-environment-changes
fn react_to_environment_changes_sync_steps(&self, generation: u32) {
// TODO reduce duplicacy of this code
fn add_cache_listener_for_element(
image_cache: Arc<dyn ImageCache>,
id: PendingImageId,
fn generate_cache_listener_for_element(
elem: &HTMLImageElement,
selected_source: String,
selected_pixel_density: f64,
) {
) -> IpcSender<PendingImageResponse> {
let trusted_node = Trusted::new(elem);
let (responder_sender, responder_receiver) = ipc::channel().unwrap();
@ -1025,27 +1017,30 @@ impl HTMLImageElement {
.task_manager()
.networking_task_source_with_canceller();
let generation = elem.generation.get();
ROUTER.add_route(responder_receiver.to_opaque(), Box::new(move |message| {
debug!("Got image {:?}", message);
// Return the image via a message to the script thread, which marks
// the element as dirty and triggers a reflow.
let element = trusted_node.clone();
let image = message.to().unwrap();
let selected_source_clone = selected_source.clone();
let _ = task_source.queue_with_canceller(
task!(process_image_response_for_environment_change: move || {
let element = element.root();
// Ignore any image response for a previous request that has been discarded.
if generation == element.generation.get() {
element.process_image_response_for_environment_change(image,
USVString::from(selected_source_clone), generation, selected_pixel_density);
}
}),
&canceller,
);
}));
ROUTER.add_route(
responder_receiver.to_opaque(),
Box::new(move |message| {
debug!("Got image {:?}", message);
// Return the image via a message to the script thread, which marks
// the element as dirty and triggers a reflow.
let element = trusted_node.clone();
let image = message.to().unwrap();
let selected_source_clone = selected_source.clone();
let _ = task_source.queue_with_canceller(
task!(process_image_response_for_environment_change: move || {
let element = element.root();
// Ignore any image response for a previous request that has been discarded.
if generation == element.generation.get() {
element.process_image_response_for_environment_change(image,
USVString::from(selected_source_clone), generation, selected_pixel_density);
}
}),
&canceller,
);
}),
);
image_cache.add_listener(id, ImageResponder::new(responder_sender, id));
responder_sender
}
let elem = self.upcast::<Element>();
@ -1099,25 +1094,32 @@ impl HTMLImageElement {
let window = window_from_node(self);
let image_cache = window.image_cache();
// Step 14
let response = image_cache.find_image_or_metadata(
img_url.clone().into(),
let sender = generate_cache_listener_for_element(
self,
selected_source.0.clone(),
selected_pixel_density,
);
let cache_result = image_cache.track_image(
img_url.clone(),
window.origin().immutable().clone(),
cors_setting_for_element(self.upcast()),
sender,
UsePlaceholder::No,
CanRequestImages::Yes,
);
match response {
Ok(ImageOrMetadataAvailable::ImageAvailable(_image, _url)) => {
match cache_result {
ImageCacheResult::Available(ImageOrMetadataAvailable::ImageAvailable(_image, _url)) => {
// Step 15
self.finish_reacting_to_environment_change(
selected_source,
generation,
selected_pixel_density,
);
)
},
Ok(ImageOrMetadataAvailable::MetadataAvailable(m)) => {
ImageCacheResult::Available(ImageOrMetadataAvailable::MetadataAvailable(m)) => {
self.process_image_response_for_environment_change(
ImageResponse::MetadataLoaded(m),
selected_source,
@ -1125,18 +1127,7 @@ impl HTMLImageElement {
selected_pixel_density,
);
},
Err(ImageState::Pending(id)) => {
add_cache_listener_for_element(
image_cache.clone(),
id,
self,
selected_source.0,
selected_pixel_density,
);
},
Err(ImageState::LoadError) => {
ImageCacheResult::LoadError => {
self.process_image_response_for_environment_change(
ImageResponse::None,
selected_source,
@ -1144,17 +1135,8 @@ impl HTMLImageElement {
selected_pixel_density,
);
},
Err(ImageState::NotRequested(id)) => {
add_cache_listener_for_element(
image_cache,
id,
self,
selected_source.0,
selected_pixel_density,
);
self.fetch_request(&img_url, id);
},
ImageCacheResult::ReadyForRequest(id) => self.fetch_request(&img_url, id),
ImageCacheResult::Pending(_) => (),
}
}