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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/svg/svg_resource.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/id_target_observer.h"
#include "third_party/blink/renderer/core/dom/tree_scope.h"
#include "third_party/blink/renderer/core/layout/svg/layout_svg_resource_container.h"
#include "third_party/blink/renderer/core/svg/svg_uri_reference.h"
#include "third_party/blink/renderer/platform/loader/fetch/fetch_initiator_type_names.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource.h"
namespace blink {
SVGResource::SVGResource() = default;
SVGResource::~SVGResource() = default;
void SVGResource::Trace(Visitor* visitor) const {
visitor->Trace(target_);
visitor->Trace(clients_);
}
void SVGResource::AddClient(SVGResourceClient& client) {
clients_.insert(&client);
if (LayoutSVGResourceContainer* container = ResourceContainer())
container->ClearInvalidationMask();
}
void SVGResource::RemoveClient(SVGResourceClient& client) {
if (!clients_.erase(&client))
return;
// The last instance of |client| was removed. Clear its entry in
// resource's cache.
if (LayoutSVGResourceContainer* container = ResourceContainer())
container->RemoveClientFromCache(client);
}
void SVGResource::NotifyElementChanged() {
HeapVector<Member<SVGResourceClient>> clients;
CopyToVector(clients_, clients);
for (SVGResourceClient* client : clients)
client->ResourceElementChanged();
}
LayoutSVGResourceContainer* SVGResource::ResourceContainer() const {
if (!target_)
return nullptr;
LayoutObject* layout_object = target_->GetLayoutObject();
if (!layout_object || !layout_object->IsSVGResourceContainer())
return nullptr;
return ToLayoutSVGResourceContainer(layout_object);
}
LocalSVGResource::LocalSVGResource(TreeScope& tree_scope,
const AtomicString& id)
: tree_scope_(tree_scope) {
target_ = SVGURIReference::ObserveTarget(
id_observer_, tree_scope, id,
WTF::BindRepeating(&LocalSVGResource::TargetChanged,
WrapWeakPersistent(this), id));
}
void LocalSVGResource::Unregister() {
SVGURIReference::UnobserveTarget(id_observer_);
}
void LocalSVGResource::NotifyContentChanged(
InvalidationModeMask invalidation_mask) {
HeapVector<Member<SVGResourceClient>> clients;
CopyToVector(clients_, clients);
for (SVGResourceClient* client : clients)
client->ResourceContentChanged(invalidation_mask);
}
void LocalSVGResource::NotifyFilterPrimitiveChanged(
SVGFilterPrimitiveStandardAttributes& primitive,
const QualifiedName& attribute) {
HeapVector<Member<SVGResourceClient>> clients;
CopyToVector(clients_, clients);
for (SVGResourceClient* client : clients)
client->FilterPrimitiveChanged(primitive, attribute);
}
void LocalSVGResource::NotifyResourceAttached(
LayoutSVGResourceContainer& attached_resource) {
// Checking the element here because
if (attached_resource.GetElement() != Target())
return;
NotifyElementChanged();
}
void LocalSVGResource::NotifyResourceDestroyed(
LayoutSVGResourceContainer& destroyed_resource) {
if (destroyed_resource.GetElement() != Target())
return;
destroyed_resource.RemoveAllClientsFromCache();
HeapVector<Member<SVGResourceClient>> clients;
CopyToVector(clients_, clients);
for (SVGResourceClient* client : clients)
client->ResourceDestroyed(&destroyed_resource);
}
void LocalSVGResource::TargetChanged(const AtomicString& id) {
Element* new_target = tree_scope_->getElementById(id);
if (new_target == target_)
return;
// Clear out caches on the old resource, and then notify clients about the
// change.
if (LayoutSVGResourceContainer* old_resource = ResourceContainer())
old_resource->RemoveAllClientsFromCache();
target_ = new_target;
NotifyElementChanged();
}
void LocalSVGResource::Trace(Visitor* visitor) const {
visitor->Trace(tree_scope_);
visitor->Trace(id_observer_);
SVGResource::Trace(visitor);
}
ExternalSVGResource::ExternalSVGResource(const KURL& url) : url_(url) {}
void ExternalSVGResource::Load(Document& document) {
if (cache_entry_)
return;
cache_entry_ = SVGExternalDocumentCache::From(document)->Get(
this, url_, fetch_initiator_type_names::kCSS);
target_ = ResolveTarget();
}
void ExternalSVGResource::LoadWithoutCSP(Document& document) {
if (cache_entry_)
return;
cache_entry_ = SVGExternalDocumentCache::From(document)->Get(
this, url_, fetch_initiator_type_names::kCSS,
network::mojom::blink::CSPDisposition::DO_NOT_CHECK);
target_ = ResolveTarget();
}
void ExternalSVGResource::NotifyFinished(Document*) {
Element* new_target = ResolveTarget();
if (new_target == target_)
return;
target_ = new_target;
NotifyElementChanged();
}
Element* ExternalSVGResource::ResolveTarget() {
if (!cache_entry_)
return nullptr;
if (!url_.HasFragmentIdentifier())
return nullptr;
Document* external_document = cache_entry_->GetDocument();
if (!external_document)
return nullptr;
AtomicString decoded_fragment(DecodeURLEscapeSequences(
url_.FragmentIdentifier(), DecodeURLMode::kUTF8OrIsomorphic));
return external_document->getElementById(decoded_fragment);
}
void ExternalSVGResource::Trace(Visitor* visitor) const {
visitor->Trace(cache_entry_);
SVGResource::Trace(visitor);
SVGExternalDocumentCache::Client::Trace(visitor);
}
} // namespace blink
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