1 /* 2 * Copyright (C) Research In Motion Limited 2010. All rights reserved. 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Library General Public 6 * License as published by the Free Software Foundation; either 7 * version 2 of the License, or (at your option) any later version. 8 * 9 * This library is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Library General Public License for more details. 13 * 14 * You should have received a copy of the GNU Library General Public License 15 * along with this library; see the file COPYING.LIB. If not, write to 16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 17 * Boston, MA 02110-1301, USA. 18 */ 19 20 #include "config.h" 21 #include "core/rendering/svg/SVGResourcesCache.h" 22 23 #include "HTMLNames.h" 24 #include "core/rendering/svg/RenderSVGResourceContainer.h" 25 #include "core/rendering/svg/SVGResources.h" 26 #include "core/rendering/svg/SVGResourcesCycleSolver.h" 27 #include "core/svg/SVGDocumentExtensions.h" 28 29 namespace WebCore { 30 31 SVGResourcesCache::SVGResourcesCache() 32 { 33 } 34 35 SVGResourcesCache::~SVGResourcesCache() 36 { 37 } 38 39 void SVGResourcesCache::addResourcesFromRenderObject(RenderObject* object, const RenderStyle* style) 40 { 41 ASSERT(object); 42 ASSERT(style); 43 ASSERT(!m_cache.contains(object)); 44 45 const SVGRenderStyle* svgStyle = style->svgStyle(); 46 ASSERT(svgStyle); 47 48 // Build a list of all resources associated with the passed RenderObject 49 OwnPtr<SVGResources> newResources = adoptPtr(new SVGResources); 50 if (!newResources->buildResources(object, svgStyle)) 51 return; 52 53 // Put object in cache. 54 SVGResources* resources = m_cache.set(object, newResources.release()).iterator->value.get(); 55 56 // Run cycle-detection _afterwards_, so self-references can be caught as well. 57 SVGResourcesCycleSolver solver(object, resources); 58 solver.resolveCycles(); 59 60 // Walk resources and register the render object at each resources. 61 HashSet<RenderSVGResourceContainer*> resourceSet; 62 resources->buildSetOfResources(resourceSet); 63 64 HashSet<RenderSVGResourceContainer*>::iterator end = resourceSet.end(); 65 for (HashSet<RenderSVGResourceContainer*>::iterator it = resourceSet.begin(); it != end; ++it) 66 (*it)->addClient(object); 67 } 68 69 void SVGResourcesCache::removeResourcesFromRenderObject(RenderObject* object) 70 { 71 if (!m_cache.contains(object)) 72 return; 73 74 OwnPtr<SVGResources> resources = m_cache.take(object); 75 76 // Walk resources and register the render object at each resources. 77 HashSet<RenderSVGResourceContainer*> resourceSet; 78 resources->buildSetOfResources(resourceSet); 79 80 HashSet<RenderSVGResourceContainer*>::iterator end = resourceSet.end(); 81 for (HashSet<RenderSVGResourceContainer*>::iterator it = resourceSet.begin(); it != end; ++it) 82 (*it)->removeClient(object); 83 } 84 85 static inline SVGResourcesCache* resourcesCacheFromRenderObject(const RenderObject* renderer) 86 { 87 Document* document = renderer->document(); 88 ASSERT(document); 89 90 SVGDocumentExtensions* extensions = document->accessSVGExtensions(); 91 ASSERT(extensions); 92 93 SVGResourcesCache* cache = extensions->resourcesCache(); 94 ASSERT(cache); 95 96 return cache; 97 } 98 99 SVGResources* SVGResourcesCache::cachedResourcesForRenderObject(const RenderObject* renderer) 100 { 101 ASSERT(renderer); 102 return resourcesCacheFromRenderObject(renderer)->m_cache.get(renderer); 103 } 104 105 void SVGResourcesCache::clientLayoutChanged(RenderObject* object) 106 { 107 SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object); 108 if (!resources) 109 return; 110 111 // Invalidate the resources if either the RenderObject itself changed, 112 // or we have filter resources, which could depend on the layout of children. 113 if (object->selfNeedsLayout() || resources->filter()) 114 resources->removeClientFromCache(object); 115 } 116 117 static inline bool rendererCanHaveResources(RenderObject* renderer) 118 { 119 ASSERT(renderer); 120 return renderer->node() && renderer->node()->isSVGElement() && !renderer->isSVGInlineText(); 121 } 122 123 void SVGResourcesCache::clientStyleChanged(RenderObject* renderer, StyleDifference diff, const RenderStyle* newStyle) 124 { 125 ASSERT(renderer); 126 if (diff == StyleDifferenceEqual || !renderer->parent()) 127 return; 128 129 // In this case the proper SVGFE*Element will decide whether the modified CSS properties require a relayout or repaint. 130 if (renderer->isSVGResourceFilterPrimitive() && (diff == StyleDifferenceRepaint || diff == StyleDifferenceRepaintIfText)) 131 return; 132 133 // Dynamic changes of CSS properties like 'clip-path' may require us to recompute the associated resources for a renderer. 134 // FIXME: Avoid passing in a useless StyleDifference, but instead compare oldStyle/newStyle to see which resources changed 135 // to be able to selectively rebuild individual resources, instead of all of them. 136 if (rendererCanHaveResources(renderer)) { 137 SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer); 138 cache->removeResourcesFromRenderObject(renderer); 139 cache->addResourcesFromRenderObject(renderer, newStyle); 140 } 141 142 RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false); 143 144 // FIXME: This doesn't look right, we often go through here in styleDidChange which means 145 // we're changing the needsStyleRecalc bits in the middle of recalcStyle on ourself which 146 // makes no sense. It's also not clear why we'd go through here for non-SVG elements. 147 if (renderer->node() && !renderer->node()->isSVGElement()) 148 renderer->node()->setNeedsStyleRecalc(LocalStyleChange, StyleChangeFromRenderer); 149 } 150 151 void SVGResourcesCache::clientWasAddedToTree(RenderObject* renderer, const RenderStyle* newStyle) 152 { 153 if (!renderer->node()) 154 return; 155 RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false); 156 157 if (!rendererCanHaveResources(renderer)) 158 return; 159 SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer); 160 cache->addResourcesFromRenderObject(renderer, newStyle); 161 } 162 163 void SVGResourcesCache::clientWillBeRemovedFromTree(RenderObject* renderer) 164 { 165 if (!renderer->node()) 166 return; 167 RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, false); 168 169 if (!rendererCanHaveResources(renderer)) 170 return; 171 SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer); 172 cache->removeResourcesFromRenderObject(renderer); 173 } 174 175 void SVGResourcesCache::clientDestroyed(RenderObject* renderer) 176 { 177 ASSERT(renderer); 178 179 SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(renderer); 180 if (resources) 181 resources->removeClientFromCache(renderer); 182 183 SVGResourcesCache* cache = resourcesCacheFromRenderObject(renderer); 184 cache->removeResourcesFromRenderObject(renderer); 185 } 186 187 void SVGResourcesCache::resourceDestroyed(RenderSVGResourceContainer* resource) 188 { 189 ASSERT(resource); 190 SVGResourcesCache* cache = resourcesCacheFromRenderObject(resource); 191 192 // The resource itself may have clients, that need to be notified. 193 cache->removeResourcesFromRenderObject(resource); 194 195 CacheMap::iterator end = cache->m_cache.end(); 196 for (CacheMap::iterator it = cache->m_cache.begin(); it != end; ++it) { 197 it->value->resourceDestroyed(resource); 198 199 // Mark users of destroyed resources as pending resolution based on the id of the old resource. 200 Element* resourceElement = toElement(resource->node()); 201 Element* clientElement = toElement(it->key->node()); 202 SVGDocumentExtensions* extensions = clientElement->document()->accessSVGExtensions(); 203 204 extensions->addPendingResource(resourceElement->fastGetAttribute(HTMLNames::idAttr), clientElement); 205 } 206 } 207 208 } 209
