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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/page/FrameView.h"
     28 #include "core/rendering/svg/RenderSVGResourceClipper.h"
     29 #include "core/rendering/svg/RenderSVGResourceFilter.h"
     30 #include "core/rendering/svg/RenderSVGResourceMasker.h"
     31 #include "core/rendering/svg/RenderSVGResourceSolidColor.h"
     32 #include "core/rendering/svg/SVGResources.h"
     33 #include "core/rendering/svg/SVGResourcesCache.h"
     34 
     35 namespace WebCore {
     36 
     37 static inline bool inheritColorFromParentStyleIfNeeded(RenderObject* object, bool applyToFill, StyleColor& color)
     38 {
     39     if (color.isValid())
     40         return true;
     41     if (!object->parent() || !object->parent()->style())
     42         return false;
     43     const SVGRenderStyle* parentSVGStyle = object->parent()->style()->svgStyle();
     44     color = applyToFill ? parentSVGStyle->fillPaintColor() : parentSVGStyle->strokePaintColor();
     45     return true;
     46 }
     47 
     48 static inline RenderSVGResource* requestPaintingResource(RenderSVGResourceMode mode, RenderObject* object, const RenderStyle* style, StyleColor& fallbackColor)
     49 {
     50     ASSERT(object);
     51     ASSERT(style);
     52 
     53     // If we have no style at all, ignore it.
     54     const SVGRenderStyle* svgStyle = style->svgStyle();
     55     if (!svgStyle)
     56         return 0;
     57 
     58     bool isRenderingMask = false;
     59     if (object->frame() && object->frame()->view())
     60         isRenderingMask = object->frame()->view()->paintBehavior() & PaintBehaviorRenderingSVGMask;
     61 
     62     // If we have no fill/stroke, return 0.
     63     if (mode == ApplyToFillMode) {
     64         // When rendering the mask for a RenderSVGResourceClipper, always use the initial fill paint server, and ignore stroke.
     65         if (isRenderingMask) {
     66             RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
     67             colorResource->setColor(SVGRenderStyle::initialFillPaintColor());
     68             return colorResource;
     69         }
     70 
     71         if (!svgStyle->hasFill())
     72             return 0;
     73     } else {
     74         if (!svgStyle->hasStroke() || isRenderingMask)
     75             return 0;
     76     }
     77 
     78     bool applyToFill = mode == ApplyToFillMode;
     79     SVGPaint::SVGPaintType paintType = applyToFill ? svgStyle->fillPaintType() : svgStyle->strokePaintType();
     80     if (paintType == SVGPaint::SVG_PAINTTYPE_NONE)
     81         return 0;
     82 
     83     StyleColor color;
     84     switch (paintType) {
     85     case SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR:
     86     case SVGPaint::SVG_PAINTTYPE_RGBCOLOR:
     87     case SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR:
     88     case SVGPaint::SVG_PAINTTYPE_URI_CURRENTCOLOR:
     89     case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR:
     90     case SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR:
     91         color = applyToFill ? svgStyle->fillPaintColor() : svgStyle->strokePaintColor();
     92     default:
     93         break;
     94     }
     95 
     96     if (style->insideLink() == InsideVisitedLink) {
     97         // FIXME: This code doesn't support the uri component of the visited link paint, https://bugs.webkit.org/show_bug.cgi?id=70006
     98         SVGPaint::SVGPaintType visitedPaintType = applyToFill ? svgStyle->visitedLinkFillPaintType() : svgStyle->visitedLinkStrokePaintType();
     99 
    100         // For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the 'visitedColor'.
    101         if (visitedPaintType < SVGPaint::SVG_PAINTTYPE_URI_NONE && visitedPaintType != SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR) {
    102             const Color& visitedColor = applyToFill ? svgStyle->visitedLinkFillPaintColor() : svgStyle->visitedLinkStrokePaintColor();
    103             color = Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), color.alpha());
    104         }
    105     }
    106 
    107     // If the primary resource is just a color, return immediately.
    108     RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
    109     if (paintType < SVGPaint::SVG_PAINTTYPE_URI_NONE) {
    110         if (!inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
    111             return 0;
    112 
    113         colorResource->setColor(color.color());
    114         return colorResource;
    115     }
    116 
    117     // If no resources are associated with the given renderer, return the color resource.
    118     SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object);
    119     if (!resources) {
    120         if (paintType == SVGPaint::SVG_PAINTTYPE_URI_NONE || !inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
    121             return 0;
    122 
    123         colorResource->setColor(color.color());
    124         return colorResource;
    125     }
    126 
    127     // If the requested resource is not available, return the color resource.
    128     RenderSVGResource* uriResource = mode == ApplyToFillMode ? resources->fill() : resources->stroke();
    129     if (!uriResource) {
    130         if (!inheritColorFromParentStyleIfNeeded(object, applyToFill, color))
    131             return 0;
    132 
    133         colorResource->setColor(color.color());
    134         return colorResource;
    135     }
    136 
    137     // The paint server resource exists, though it may be invalid (pattern with width/height=0). Pass the fallback color to our caller
    138     // so it can use the solid color painting resource, if applyResource() on the URI resource failed.
    139     fallbackColor = color;
    140     return uriResource;
    141 }
    142 
    143 RenderSVGResource* RenderSVGResource::fillPaintingResource(RenderObject* object, const RenderStyle* style, StyleColor& fallbackColor)
    144 {
    145     return requestPaintingResource(ApplyToFillMode, object, style, fallbackColor);
    146 }
    147 
    148 RenderSVGResource* RenderSVGResource::strokePaintingResource(RenderObject* object, const RenderStyle* style, StyleColor& fallbackColor)
    149 {
    150     return requestPaintingResource(ApplyToStrokeMode, object, style, fallbackColor);
    151 }
    152 
    153 RenderSVGResourceSolidColor* RenderSVGResource::sharedSolidPaintingResource()
    154 {
    155     static RenderSVGResourceSolidColor* s_sharedSolidPaintingResource = 0;
    156     if (!s_sharedSolidPaintingResource)
    157         s_sharedSolidPaintingResource = new RenderSVGResourceSolidColor;
    158     return s_sharedSolidPaintingResource;
    159 }
    160 
    161 static inline void removeFromCacheAndInvalidateDependencies(RenderObject* object, bool needsLayout)
    162 {
    163     ASSERT(object);
    164     if (SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object)) {
    165         if (RenderSVGResourceFilter* filter = resources->filter())
    166             filter->removeClientFromCache(object);
    167 
    168         if (RenderSVGResourceMasker* masker = resources->masker())
    169             masker->removeClientFromCache(object);
    170 
    171         if (RenderSVGResourceClipper* clipper = resources->clipper())
    172             clipper->removeClientFromCache(object);
    173     }
    174 
    175     if (!object->node() || !object->node()->isSVGElement())
    176         return;
    177     HashSet<SVGElement*>* dependencies = object->document()->accessSVGExtensions()->setOfElementsReferencingTarget(toSVGElement(object->node()));
    178     if (!dependencies)
    179         return;
    180     HashSet<SVGElement*>::iterator end = dependencies->end();
    181     for (HashSet<SVGElement*>::iterator it = dependencies->begin(); it != end; ++it) {
    182         if (RenderObject* renderer = (*it)->renderer())
    183             RenderSVGResource::markForLayoutAndParentResourceInvalidation(renderer, needsLayout);
    184     }
    185 }
    186 
    187 void RenderSVGResource::markForLayoutAndParentResourceInvalidation(RenderObject* object, bool needsLayout)
    188 {
    189     ASSERT(object);
    190     ASSERT(object->document());
    191     ASSERT(object->node());
    192 
    193     if (needsLayout)
    194         object->setNeedsLayout();
    195 
    196     removeFromCacheAndInvalidateDependencies(object, needsLayout);
    197 
    198     // Invalidate resources in ancestor chain, if needed.
    199     RenderObject* current = object->parent();
    200     while (current) {
    201         removeFromCacheAndInvalidateDependencies(current, needsLayout);
    202 
    203         if (current->isSVGResourceContainer()) {
    204             // This will process the rest of the ancestors.
    205             current->toRenderSVGResourceContainer()->removeAllClientsFromCache();
    206             break;
    207         }
    208 
    209         current = current->parent();
    210     }
    211 }
    212 
    213 }
    214