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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/SVGResourcesCache.h"
#include "core/HTMLNames.h"
#include "core/layout/svg/LayoutSVGResourceContainer.h"
#include "core/layout/svg/SVGResources.h"
#include "core/layout/svg/SVGResourcesCycleSolver.h"
#include "core/svg/SVGDocumentExtensions.h"
#include <memory>
namespace blink {
SVGResourcesCache::SVGResourcesCache() {}
SVGResourcesCache::~SVGResourcesCache() {}
void SVGResourcesCache::addResourcesFromLayoutObject(
LayoutObject* object,
const ComputedStyle& style) {
ASSERT(object);
ASSERT(!m_cache.contains(object));
// Build a list of all resources associated with the passed LayoutObject.
std::unique_ptr<SVGResources> newResources =
SVGResources::buildResources(object, style);
if (!newResources)
return;
// Put object in cache.
SVGResources* resources =
m_cache.set(object, std::move(newResources)).storedValue->value.get();
// Run cycle-detection _afterwards_, so self-references can be caught as well.
SVGResourcesCycleSolver solver(object, resources);
solver.resolveCycles();
// Walk resources and register the layout object as a client of each resource.
HashSet<LayoutSVGResourceContainer*> resourceSet;
resources->buildSetOfResources(resourceSet);
for (auto* resourceContainer : resourceSet)
resourceContainer->addClient(object);
}
void SVGResourcesCache::removeResourcesFromLayoutObject(LayoutObject* object) {
std::unique_ptr<SVGResources> resources = m_cache.take(object);
if (!resources)
return;
// Walk resources and unregister the layout object as a client of each
// resource.
HashSet<LayoutSVGResourceContainer*> resourceSet;
resources->buildSetOfResources(resourceSet);
for (auto* resourceContainer : resourceSet)
resourceContainer->removeClient(object);
}
static inline SVGResourcesCache& resourcesCache(Document& document) {
return document.accessSVGExtensions().resourcesCache();
}
SVGResources* SVGResourcesCache::cachedResourcesForLayoutObject(
const LayoutObject* layoutObject) {
ASSERT(layoutObject);
return resourcesCache(layoutObject->document()).m_cache.get(layoutObject);
}
void SVGResourcesCache::clientLayoutChanged(LayoutObject* object) {
SVGResources* resources = cachedResourcesForLayoutObject(object);
if (!resources)
return;
// Invalidate the resources if either the LayoutObject itself changed,
// or we have filter resources, which could depend on the layout of children.
if (object->selfNeedsLayout() || resources->filter())
resources->removeClientFromCache(object);
}
static inline bool layoutObjectCanHaveResources(LayoutObject* layoutObject) {
ASSERT(layoutObject);
return layoutObject->node() && layoutObject->node()->isSVGElement() &&
!layoutObject->isSVGInlineText();
}
void SVGResourcesCache::clientStyleChanged(LayoutObject* layoutObject,
StyleDifference diff,
const ComputedStyle& newStyle) {
ASSERT(layoutObject);
ASSERT(layoutObject->node());
ASSERT(layoutObject->node()->isSVGElement());
if (!diff.hasDifference() || !layoutObject->parent())
return;
// In this case the proper SVGFE*Element will decide whether the modified CSS
// properties require
// a relayout or paintInvalidation.
if (layoutObject->isSVGResourceFilterPrimitive() && !diff.needsLayout())
return;
// Dynamic changes of CSS properties like 'clip-path' may require us to
// recompute the associated resources for a LayoutObject.
// TODO(fs): Avoid passing in a useless StyleDifference, but instead compare
// oldStyle/newStyle to see which resources changed to be able to selectively
// rebuild individual resources, instead of all of them.
if (layoutObjectCanHaveResources(layoutObject)) {
SVGResourcesCache& cache = resourcesCache(layoutObject->document());
cache.removeResourcesFromLayoutObject(layoutObject);
cache.addResourcesFromLayoutObject(layoutObject, newStyle);
}
LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
layoutObject, false);
}
void SVGResourcesCache::clientWasAddedToTree(LayoutObject* layoutObject,
const ComputedStyle& newStyle) {
if (!layoutObject->node())
return;
LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
layoutObject, false);
if (!layoutObjectCanHaveResources(layoutObject))
return;
SVGResourcesCache& cache = resourcesCache(layoutObject->document());
cache.addResourcesFromLayoutObject(layoutObject, newStyle);
}
void SVGResourcesCache::clientWillBeRemovedFromTree(
LayoutObject* layoutObject) {
if (!layoutObject->node())
return;
LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
layoutObject, false);
if (!layoutObjectCanHaveResources(layoutObject))
return;
SVGResourcesCache& cache = resourcesCache(layoutObject->document());
cache.removeResourcesFromLayoutObject(layoutObject);
}
void SVGResourcesCache::clientDestroyed(LayoutObject* layoutObject) {
ASSERT(layoutObject);
SVGResources* resources = cachedResourcesForLayoutObject(layoutObject);
if (resources)
resources->removeClientFromCache(layoutObject);
SVGResourcesCache& cache = resourcesCache(layoutObject->document());
cache.removeResourcesFromLayoutObject(layoutObject);
}
} // namespace blink
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