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      1 /*
      2  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2007 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2008 Dirk Schulze <krit (at) webkit.org>
      5  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 
     25 #include "core/rendering/svg/RenderSVGResource.h"
     26 
     27 #include "core/frame/FrameView.h"
     28 #include "core/frame/LocalFrame.h"
     29 #include "core/rendering/svg/RenderSVGResourceClipper.h"
     30 #include "core/rendering/svg/RenderSVGResourceFilter.h"
     31 #include "core/rendering/svg/RenderSVGResourceMasker.h"
     32 #include "core/rendering/svg/RenderSVGResourceSolidColor.h"
     33 #include "core/rendering/svg/SVGResources.h"
     34 #include "core/rendering/svg/SVGResourcesCache.h"
     35 
     36 namespace WebCore {
     37 
     38 static inline bool inheritColorFromParentStyle(RenderObject* object, bool applyToFill, Color& color)
     39 {
     40     if (!object->parent() || !object->parent()->style())
     41         return false;
     42     const SVGRenderStyle* parentSVGStyle = object->parent()->style()->svgStyle();
     43     SVGPaint::SVGPaintType paintType = applyToFill ? parentSVGStyle->fillPaintType() : parentSVGStyle->strokePaintType();
     44     if (paintType != SVGPaint::SVG_PAINTTYPE_RGBCOLOR && paintType != SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR)
     45         return false;
     46     color = applyToFill ? parentSVGStyle->fillPaintColor() : parentSVGStyle->strokePaintColor();
     47     return true;
     48 }
     49 
     50 static inline RenderSVGResource* requestPaintingResource(RenderSVGResourceMode mode, RenderObject* object, const RenderStyle* style, bool& hasFallback)
     51 {
     52     ASSERT(object);
     53     ASSERT(style);
     54 
     55     hasFallback = false;
     56 
     57     // If we have no style at all, ignore it.
     58     const SVGRenderStyle* svgStyle = style->svgStyle();
     59     if (!svgStyle)
     60         return 0;
     61 
     62     bool isRenderingMask = false;
     63     if (object->frame() && object->frame()->view())
     64         isRenderingMask = object->frame()->view()->paintBehavior() & PaintBehaviorRenderingSVGMask;
     65 
     66     // If we have no fill/stroke, return 0.
     67     if (mode == ApplyToFillMode) {
     68         // When rendering the mask for a RenderSVGResourceClipper, always use the initial fill paint server, and ignore stroke.
     69         if (isRenderingMask) {
     70             RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
     71             colorResource->setColor(SVGRenderStyle::initialFillPaintColor());
     72             return colorResource;
     73         }
     74 
     75         if (!svgStyle->hasFill())
     76             return 0;
     77     } else {
     78         if (!svgStyle->hasStroke() || isRenderingMask)
     79             return 0;
     80     }
     81 
     82     bool applyToFill = mode == ApplyToFillMode;
     83     SVGPaint::SVGPaintType paintType = applyToFill ? svgStyle->fillPaintType() : svgStyle->strokePaintType();
     84     ASSERT(paintType != SVGPaint::SVG_PAINTTYPE_NONE);
     85 
     86     Color color;
     87     bool hasColor = false;
     88     switch (paintType) {
     89     case SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR:
     90     case SVGPaint::SVG_PAINTTYPE_RGBCOLOR:
     91     case SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR:
     92     case SVGPaint::SVG_PAINTTYPE_URI_CURRENTCOLOR:
     93     case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR:
     94     case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR:
     95         color = applyToFill ? svgStyle->fillPaintColor() : svgStyle->strokePaintColor();
     96         hasColor = true;
     97     default:
     98         break;
     99     }
    100 
    101     if (style->insideLink() == InsideVisitedLink) {
    102         // FIXME: This code doesn't support the uri component of the visited link paint, https://bugs.webkit.org/show_bug.cgi?id=70006
    103         SVGPaint::SVGPaintType visitedPaintType = applyToFill ? svgStyle->visitedLinkFillPaintType() : svgStyle->visitedLinkStrokePaintType();
    104 
    105         // For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the 'visitedColor'.
    106         if (visitedPaintType < SVGPaint::SVG_PAINTTYPE_URI_NONE && visitedPaintType != SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR) {
    107             const Color& visitedColor = applyToFill ? svgStyle->visitedLinkFillPaintColor() : svgStyle->visitedLinkStrokePaintColor();
    108             color = Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), color.alpha());
    109             hasColor = true;
    110         }
    111     }
    112 
    113     // If the primary resource is just a color, return immediately.
    114     RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
    115     if (paintType < SVGPaint::SVG_PAINTTYPE_URI_NONE) {
    116         if (!hasColor && !inheritColorFromParentStyle(object, applyToFill, color))
    117             return 0;
    118 
    119         colorResource->setColor(color);
    120         return colorResource;
    121     }
    122 
    123     // If no resources are associated with the given renderer, return the color resource.
    124     SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object);
    125     if (!resources) {
    126         if (paintType == SVGPaint::SVG_PAINTTYPE_URI_NONE || (!hasColor && !inheritColorFromParentStyle(object, applyToFill, color)))
    127             return 0;
    128 
    129         colorResource->setColor(color);
    130         return colorResource;
    131     }
    132 
    133     // If the requested resource is not available, return the color resource.
    134     RenderSVGResource* uriResource = mode == ApplyToFillMode ? resources->fill() : resources->stroke();
    135     if (!uriResource) {
    136         if (!hasColor && !inheritColorFromParentStyle(object, applyToFill, color))
    137             return 0;
    138 
    139         colorResource->setColor(color);
    140         return colorResource;
    141     }
    142 
    143     // The paint server resource exists, though it may be invalid (pattern with width/height=0). Pass the fallback color to our caller
    144     // via sharedSolidPaintingResource so it can use the solid color painting resource, if applyResource() on the URI resource failed.
    145     if (hasColor) {
    146         colorResource->setColor(color);
    147         hasFallback = true;
    148     }
    149     return uriResource;
    150 }
    151 
    152 RenderSVGResource* RenderSVGResource::fillPaintingResource(RenderObject* object, const RenderStyle* style, bool& hasFallback)
    153 {
    154     return requestPaintingResource(ApplyToFillMode, object, style, hasFallback);
    155 }
    156 
    157 RenderSVGResource* RenderSVGResource::strokePaintingResource(RenderObject* object, const RenderStyle* style, bool& hasFallback)
    158 {
    159     return requestPaintingResource(ApplyToStrokeMode, object, style, hasFallback);
    160 }
    161 
    162 RenderSVGResourceSolidColor* RenderSVGResource::sharedSolidPaintingResource()
    163 {
    164     static RenderSVGResourceSolidColor* s_sharedSolidPaintingResource = 0;
    165     if (!s_sharedSolidPaintingResource)
    166         s_sharedSolidPaintingResource = new RenderSVGResourceSolidColor;
    167     return s_sharedSolidPaintingResource;
    168 }
    169 
    170 static inline void removeFromCacheAndInvalidateDependencies(RenderObject* object, bool needsLayout)
    171 {
    172     ASSERT(object);
    173     if (SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object)) {
    174         if (RenderSVGResourceFilter* filter = resources->filter())
    175             filter->removeClientFromCache(object);
    176 
    177         if (RenderSVGResourceMasker* masker = resources->masker())
    178             masker->removeClientFromCache(object);
    179 
    180         if (RenderSVGResourceClipper* clipper = resources->clipper())
    181             clipper->removeClientFromCache(object);
    182     }
    183 
    184     if (!object->node() || !object->node()->isSVGElement())
    185         return;
    186     SVGElementSet* dependencies = object->document().accessSVGExtensions().setOfElementsReferencingTarget(toSVGElement(object->node()));
    187     if (!dependencies)
    188         return;
    189 
    190     // We allow cycles in SVGDocumentExtensions reference sets in order to avoid expensive
    191     // reference graph adjustments on changes, so we need to break possible cycles here.
    192     // This strong reference is safe, as it is guaranteed that this set will be emptied
    193     // at the end of recursion.
    194     typedef WillBeHeapHashSet<RawPtrWillBeMember<SVGElement> > SVGElementSet;
    195     DEFINE_STATIC_LOCAL(OwnPtrWillBePersistent<SVGElementSet>, invalidatingDependencies, (adoptPtrWillBeNoop(new SVGElementSet)));
    196 
    197     SVGElementSet::iterator end = dependencies->end();
    198     for (SVGElementSet::iterator it = dependencies->begin(); it != end; ++it) {
    199         if (RenderObject* renderer = (*it)->renderer()) {
    200             if (UNLIKELY(!invalidatingDependencies->add(*it).isNewEntry)) {
    201                 // Reference cycle: we are in process of invalidating this dependant.
    202                 continue;
    203             }
    204 
    205             RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, needsLayout);
    206             invalidatingDependencies->remove(*it);
    207         }
    208     }
    209 }
    210 
    211 void RenderSVGResource::markForLayoutAndParentResourceInvalidation(RenderObject* object, bool needsLayout)
    212 {
    213     ASSERT(object);
    214     ASSERT(object->node());
    215 
    216     if (needsLayout && !object->documentBeingDestroyed())
    217         object->setNeedsLayoutAndFullPaintInvalidation();
    218 
    219     removeFromCacheAndInvalidateDependencies(object, needsLayout);
    220 
    221     // Invalidate resources in ancestor chain, if needed.
    222     RenderObject* current = object->parent();
    223     while (current) {
    224         removeFromCacheAndInvalidateDependencies(current, needsLayout);
    225 
    226         if (current->isSVGResourceContainer()) {
    227             // This will process the rest of the ancestors.
    228             toRenderSVGResourceContainer(current)->removeAllClientsFromCache();
    229             break;
    230         }
    231 
    232         current = current->parent();
    233     }
    234 }
    235 
    236 }
    237