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/*
* Copyright (C) Research In Motion Limited 2010. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "core/layout/svg/LayoutSVGResourceContainer.h"
#include "core/layout/svg/SVGResources.h"
#include "core/layout/svg/SVGResourcesCache.h"
#include "core/svg/SVGElementProxy.h"
#include "wtf/AutoReset.h"
namespace blink {
static inline SVGDocumentExtensions& svgExtensionsFromElement(
Element* element) {
ASSERT(element);
return element->document().accessSVGExtensions();
}
LayoutSVGResourceContainer::LayoutSVGResourceContainer(SVGElement* node)
: LayoutSVGHiddenContainer(node),
m_isInLayout(false),
m_id(node->getIdAttribute()),
m_invalidationMask(0),
m_registered(false),
m_isInvalidating(false) {}
LayoutSVGResourceContainer::~LayoutSVGResourceContainer() {}
void LayoutSVGResourceContainer::layout() {
// FIXME: Investigate a way to detect and break resource layout dependency
// cycles early. Then we can remove this method altogether, and fall back onto
// LayoutSVGHiddenContainer::layout().
ASSERT(needsLayout());
if (m_isInLayout)
return;
AutoReset<bool> inLayoutChange(&m_isInLayout, true);
LayoutSVGHiddenContainer::layout();
clearInvalidationMask();
}
SVGElementProxySet* LayoutSVGResourceContainer::elementProxySet() {
return element()->elementProxySet();
}
void LayoutSVGResourceContainer::notifyContentChanged() {
if (SVGElementProxySet* proxySet = elementProxySet())
proxySet->notifyContentChanged(element()->treeScope());
}
void LayoutSVGResourceContainer::willBeDestroyed() {
// Detach all clients referring to this resource. If the resource itself is
// a client, it will be detached from any such resources by the call to
// LayoutSVGHiddenContainer::willBeDestroyed() below.
detachAllClients();
LayoutSVGHiddenContainer::willBeDestroyed();
if (m_registered)
svgExtensionsFromElement(element()).removeResource(m_id);
}
void LayoutSVGResourceContainer::styleDidChange(StyleDifference diff,
const ComputedStyle* oldStyle) {
LayoutSVGHiddenContainer::styleDidChange(diff, oldStyle);
if (!m_registered) {
m_registered = true;
registerResource();
}
}
void LayoutSVGResourceContainer::detachAllClients() {
for (auto* client : m_clients) {
// Unlink the resource from the client's SVGResources. (The actual
// removal will be signaled after processing all the clients.)
SVGResources* resources =
SVGResourcesCache::cachedResourcesForLayoutObject(client);
// Or else the client wouldn't be in the list in the first place.
DCHECK(resources);
resources->resourceDestroyed(this);
// Add a pending resolution based on the id of the old resource.
Element* clientElement = toElement(client->node());
svgExtensionsFromElement(clientElement)
.addPendingResource(m_id, clientElement);
}
removeAllClientsFromCache();
}
void LayoutSVGResourceContainer::idChanged() {
// Invalidate all our current clients.
removeAllClientsFromCache();
// Remove old id, that is guaranteed to be present in cache.
SVGDocumentExtensions& extensions = svgExtensionsFromElement(element());
extensions.removeResource(m_id);
m_id = element()->getIdAttribute();
registerResource();
}
void LayoutSVGResourceContainer::markAllClientsForInvalidation(
InvalidationMode mode) {
if (m_isInvalidating)
return;
SVGElementProxySet* proxySet = elementProxySet();
if (m_clients.isEmpty() && (!proxySet || proxySet->isEmpty()))
return;
if (m_invalidationMask & mode)
return;
m_invalidationMask |= mode;
m_isInvalidating = true;
bool needsLayout = mode == LayoutAndBoundariesInvalidation;
bool markForInvalidation = mode != ParentOnlyInvalidation;
// Invalidate clients registered on the this object (via SVGResources).
for (auto* client : m_clients) {
DCHECK(client->isSVG());
if (client->isSVGResourceContainer()) {
toLayoutSVGResourceContainer(client)->removeAllClientsFromCache(
markForInvalidation);
continue;
}
if (markForInvalidation)
markClientForInvalidation(client, mode);
LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
client, needsLayout);
}
// Invalidate clients registered via an SVGElementProxy.
notifyContentChanged();
m_isInvalidating = false;
}
void LayoutSVGResourceContainer::markClientForInvalidation(
LayoutObject* client,
InvalidationMode mode) {
ASSERT(client);
ASSERT(!m_clients.isEmpty());
switch (mode) {
case LayoutAndBoundariesInvalidation:
case BoundariesInvalidation:
client->setNeedsBoundariesUpdate();
break;
case PaintInvalidation:
// Since LayoutSVGInlineTexts don't have SVGResources (they use their
// parent's), they will not be notified of changes to paint servers. So
// if the client is one that could have a LayoutSVGInlineText use a
// paint invalidation reason that will force paint invalidation of the
// entire <text>/<tspan>/... subtree.
client->setShouldDoFullPaintInvalidation(
PaintInvalidationSVGResourceChange);
// Invalidate paint properties to update effects if any.
client->setNeedsPaintPropertyUpdate();
break;
case ParentOnlyInvalidation:
break;
}
}
void LayoutSVGResourceContainer::addClient(LayoutObject* client) {
ASSERT(client);
m_clients.add(client);
clearInvalidationMask();
}
void LayoutSVGResourceContainer::removeClient(LayoutObject* client) {
ASSERT(client);
removeClientFromCache(client, false);
m_clients.remove(client);
}
void LayoutSVGResourceContainer::invalidateCacheAndMarkForLayout(
SubtreeLayoutScope* layoutScope) {
if (selfNeedsLayout())
return;
setNeedsLayoutAndFullPaintInvalidation(
LayoutInvalidationReason::SvgResourceInvalidated, MarkContainerChain,
layoutScope);
if (everHadLayout())
removeAllClientsFromCache();
}
void LayoutSVGResourceContainer::registerResource() {
SVGDocumentExtensions& extensions = svgExtensionsFromElement(element());
if (!extensions.hasPendingResource(m_id)) {
extensions.addResource(m_id, this);
return;
}
SVGDocumentExtensions::SVGPendingElements* clients(
extensions.removePendingResource(m_id));
// Cache us with the new id.
extensions.addResource(m_id, this);
// Update cached resources of pending clients.
for (const auto& pendingClient : *clients) {
DCHECK(pendingClient->hasPendingResources());
extensions.clearHasPendingResourcesIfPossible(pendingClient);
LayoutObject* layoutObject = pendingClient->layoutObject();
if (!layoutObject)
continue;
DCHECK(layoutObject->isSVG() && (resourceType() != FilterResourceType ||
!layoutObject->isSVGRoot()));
StyleDifference diff;
diff.setNeedsFullLayout();
SVGResourcesCache::clientStyleChanged(layoutObject, diff,
layoutObject->styleRef());
layoutObject->setNeedsLayoutAndFullPaintInvalidation(
LayoutInvalidationReason::SvgResourceInvalidated);
}
}
static inline void removeFromCacheAndInvalidateDependencies(
LayoutObject* object,
bool needsLayout) {
ASSERT(object);
if (SVGResources* resources =
SVGResourcesCache::cachedResourcesForLayoutObject(object)) {
resources->removeClientFromCacheAffectingObjectBounds(object);
}
if (!object->node() || !object->node()->isSVGElement())
return;
SVGElementSet* dependencies =
toSVGElement(object->node())->setOfIncomingReferences();
if (!dependencies)
return;
// We allow cycles in SVGDocumentExtensions reference sets in order to avoid
// expensive reference graph adjustments on changes, so we need to break
// possible cycles here.
// This strong reference is safe, as it is guaranteed that this set will be
// emptied at the end of recursion.
DEFINE_STATIC_LOCAL(SVGElementSet, invalidatingDependencies,
(new SVGElementSet));
for (SVGElement* element : *dependencies) {
if (LayoutObject* layoutObject = element->layoutObject()) {
if (UNLIKELY(!invalidatingDependencies.add(element).isNewEntry)) {
// Reference cycle: we are in process of invalidating this dependant.
continue;
}
LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
layoutObject, needsLayout);
invalidatingDependencies.remove(element);
}
}
}
void LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
LayoutObject* object,
bool needsLayout) {
ASSERT(object);
ASSERT(object->node());
if (needsLayout && !object->documentBeingDestroyed())
object->setNeedsLayoutAndFullPaintInvalidation(
LayoutInvalidationReason::SvgResourceInvalidated);
removeFromCacheAndInvalidateDependencies(object, needsLayout);
// Invalidate resources in ancestor chain, if needed.
LayoutObject* current = object->parent();
while (current) {
removeFromCacheAndInvalidateDependencies(current, needsLayout);
if (current->isSVGResourceContainer()) {
// This will process the rest of the ancestors.
toLayoutSVGResourceContainer(current)->removeAllClientsFromCache();
break;
}
current = current->parent();
}
}
} // namespace blink
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