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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 "config.h"
#include "SVGResourcesCache.h"
#include "HTMLNames.h"
#include "RenderSVGResourceContainer.h"
#include "SVGResources.h"
#include "SVGResourcesCycleSolver.h"
namespace WebCore {
SVGResourcesCache::SVGResourcesCache()
{
}
SVGResourcesCache::~SVGResourcesCache()
{
}
void SVGResourcesCache::addResourcesFromRenderer(RenderElement& renderer, const RenderStyle& style)
{
ASSERT(!m_cache.contains(&renderer));
// Build a list of all resources associated with the passed RenderObject
auto newResources = std::make_unique<SVGResources>();
if (!newResources->buildCachedResources(renderer, style))
return;
// Put object in cache.
SVGResources& resources = *m_cache.add(&renderer, WTFMove(newResources)).iterator->value;
// Run cycle-detection _afterwards_, so self-references can be caught as well.
SVGResourcesCycleSolver solver(renderer, resources);
solver.resolveCycles();
// Walk resources and register the render object at each resources.
HashSet<RenderSVGResourceContainer*> resourceSet;
resources.buildSetOfResources(resourceSet);
for (auto* resourceContainer : resourceSet)
resourceContainer->addClient(renderer);
}
void SVGResourcesCache::removeResourcesFromRenderer(RenderElement& renderer)
{
std::unique_ptr<SVGResources> resources = m_cache.take(&renderer);
if (!resources)
return;
// Walk resources and register the render object at each resources.
HashSet<RenderSVGResourceContainer*> resourceSet;
resources->buildSetOfResources(resourceSet);
for (auto* resourceContainer : resourceSet)
resourceContainer->removeClient(renderer);
}
static inline SVGResourcesCache& resourcesCacheFromRenderer(const RenderElement& renderer)
{
return renderer.document().accessSVGExtensions().resourcesCache();
}
SVGResources* SVGResourcesCache::cachedResourcesForRenderer(const RenderElement& renderer)
{
return resourcesCacheFromRenderer(renderer).m_cache.get(&renderer);
}
void SVGResourcesCache::clientLayoutChanged(RenderElement& renderer)
{
auto* resources = SVGResourcesCache::cachedResourcesForRenderer(renderer);
if (!resources)
return;
// Invalidate the resources if either the RenderElement itself changed,
// or we have filter resources, which could depend on the layout of children.
if (renderer.selfNeedsLayout())
resources->removeClientFromCache(renderer);
}
static inline bool rendererCanHaveResources(RenderObject& renderer)
{
return renderer.node() && renderer.node()->isSVGElement() && !renderer.isSVGInlineText();
}
void SVGResourcesCache::clientStyleChanged(RenderElement& renderer, StyleDifference diff, const RenderStyle& newStyle)
{
if (diff == StyleDifferenceEqual || !renderer.parent())
return;
// In this case the proper SVGFE*Element will decide whether the modified CSS properties require a relayout or repaint.
if (renderer.isSVGResourceFilterPrimitive() && (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfTextOrBorderOrOutline))
return;
// Dynamic changes of CSS properties like 'clip-path' may require us to recompute the associated resources for a renderer.
// FIXME: 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 (rendererCanHaveResources(renderer)) {
auto& cache = resourcesCacheFromRenderer(renderer);
cache.removeResourcesFromRenderer(renderer);
cache.addResourcesFromRenderer(renderer, newStyle);
}
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
if (renderer.element() && !renderer.element()->isSVGElement())
renderer.element()->setNeedsStyleRecalc(SyntheticStyleChange);
}
void SVGResourcesCache::clientWasAddedToTree(RenderObject& renderer)
{
if (renderer.isAnonymous())
return;
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
if (!rendererCanHaveResources(renderer))
return;
RenderElement& elementRenderer = downcast<RenderElement>(renderer);
resourcesCacheFromRenderer(elementRenderer).addResourcesFromRenderer(elementRenderer, elementRenderer.style());
}
void SVGResourcesCache::clientWillBeRemovedFromTree(RenderObject& renderer)
{
if (renderer.isAnonymous())
return;
RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false);
if (!rendererCanHaveResources(renderer))
return;
RenderElement& elementRenderer = downcast<RenderElement>(renderer);
resourcesCacheFromRenderer(elementRenderer).removeResourcesFromRenderer(elementRenderer);
}
void SVGResourcesCache::clientDestroyed(RenderElement& renderer)
{
if (auto* resources = SVGResourcesCache::cachedResourcesForRenderer(renderer))
resources->removeClientFromCache(renderer);
resourcesCacheFromRenderer(renderer).removeResourcesFromRenderer(renderer);
}
void SVGResourcesCache::resourceDestroyed(RenderSVGResourceContainer& resource)
{
auto& cache = resourcesCacheFromRenderer(resource);
// The resource itself may have clients, that need to be notified.
cache.removeResourcesFromRenderer(resource);
for (auto& it : cache.m_cache) {
it.value->resourceDestroyed(resource);
// Mark users of destroyed resources as pending resolution based on the id of the old resource.
Element& resourceElement = resource.element();
Element* clientElement = it.key->element();
clientElement->document().accessSVGExtensions().addPendingResource(resourceElement.getIdAttribute(), clientElement);
}
}
}
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