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1 /*
2  * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
3  * Copyright (C) 2007 Rob Buis <buis@kde.org>
4  * Copyright (C) 2008 Dirk Schulze <krit@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 #if ENABLE(SVG)
26 #include "RenderSVGResource.h"
27 
28 #include "RenderSVGResourceContainer.h"
29 #include "RenderSVGResourceSolidColor.h"
30 #include "SVGResources.h"
31 #include "SVGURIReference.h"
32 
33 namespace WebCore {
34 
requestPaintingResource(RenderSVGResourceMode mode,RenderObject * object,const RenderStyle * style,Color & fallbackColor)35 static inline RenderSVGResource* requestPaintingResource(RenderSVGResourceMode mode, RenderObject* object, const RenderStyle* style, Color& fallbackColor)
36 {
37     ASSERT(object);
38     ASSERT(style);
39 
40     // If we have no style at all, ignore it.
41     const SVGRenderStyle* svgStyle = style->svgStyle();
42     if (!svgStyle)
43         return 0;
44 
45     // If we have no fill/stroke, return 0.
46     if (mode == ApplyToFillMode) {
47         if (!svgStyle->hasFill())
48             return 0;
49     } else {
50         if (!svgStyle->hasStroke())
51             return 0;
52     }
53 
54     SVGPaint* paint = mode == ApplyToFillMode ? svgStyle->fillPaint() : svgStyle->strokePaint();
55     ASSERT(paint);
56 
57     SVGPaint::SVGPaintType paintType = paint->paintType();
58     if (paintType == SVGPaint::SVG_PAINTTYPE_NONE)
59         return 0;
60 
61     Color color;
62     if (paintType == SVGPaint::SVG_PAINTTYPE_RGBCOLOR
63         || paintType == SVGPaint::SVG_PAINTTYPE_RGBCOLOR_ICCCOLOR
64         || paintType == SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR
65         || paintType == SVGPaint::SVG_PAINTTYPE_URI_RGBCOLOR_ICCCOLOR)
66         color = paint->color();
67     else if (paintType == SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR || paintType == SVGPaint::SVG_PAINTTYPE_URI_CURRENTCOLOR)
68         color = style->visitedDependentColor(CSSPropertyColor);
69 
70     if (style->insideLink() == InsideVisitedLink) {
71         RenderStyle* visitedStyle = style->getCachedPseudoStyle(VISITED_LINK);
72         ASSERT(visitedStyle);
73 
74         if (SVGPaint* visitedPaint = mode == ApplyToFillMode ? visitedStyle->svgStyle()->fillPaint() : visitedStyle->svgStyle()->strokePaint()) {
75             // For SVG_PAINTTYPE_CURRENTCOLOR, 'color' already contains the 'visitedColor'.
76             if (visitedPaint->paintType() < SVGPaint::SVG_PAINTTYPE_URI_NONE && visitedPaint->paintType() != SVGPaint::SVG_PAINTTYPE_CURRENTCOLOR) {
77                 const Color& visitedColor = visitedPaint->color();
78                 if (visitedColor.isValid())
79                     color = Color(visitedColor.red(), visitedColor.green(), visitedColor.blue(), color.alpha());
80             }
81         }
82     }
83 
84     // If the primary resource is just a color, return immediately.
85     RenderSVGResourceSolidColor* colorResource = RenderSVGResource::sharedSolidPaintingResource();
86     if (paintType < SVGPaint::SVG_PAINTTYPE_URI_NONE) {
87         // If an invalid fill color is specified, fallback to fill/stroke="none".
88         if (!color.isValid())
89             return 0;
90 
91         colorResource->setColor(color);
92         return colorResource;
93     }
94 
95     // If no resources are associated with the given renderer, return the color resource.
96     SVGResources* resources = SVGResourcesCache::cachedResourcesForRenderObject(object);
97     if (!resources) {
98         // If a paint server is specified, and no or an invalid fallback color is given, default to fill/stroke="black".
99         if (!color.isValid())
100             color = Color::black;
101 
102         colorResource->setColor(color);
103         return colorResource;
104     }
105 
106     // If the requested resource is not available, return the color resource.
107     RenderSVGResource* uriResource = mode == ApplyToFillMode ? resources->fill() : resources->stroke();
108     if (!uriResource) {
109         // If a paint server is specified, and no or an invalid fallback color is given, default to fill/stroke="black".
110         if (!color.isValid())
111             color = Color::black;
112 
113         colorResource->setColor(color);
114         return colorResource;
115     }
116 
117     // The paint server resource exists, though it may be invalid (pattern with width/height=0). Pass the fallback color to our caller
118     // so it can use the solid color painting resource, if applyResource() on the URI resource failed.
119     fallbackColor = color;
120     return uriResource;
121 }
122 
fillPaintingResource(RenderObject * object,const RenderStyle * style,Color & fallbackColor)123 RenderSVGResource* RenderSVGResource::fillPaintingResource(RenderObject* object, const RenderStyle* style, Color& fallbackColor)
124 {
125     return requestPaintingResource(ApplyToFillMode, object, style, fallbackColor);
126 }
127 
strokePaintingResource(RenderObject * object,const RenderStyle * style,Color & fallbackColor)128 RenderSVGResource* RenderSVGResource::strokePaintingResource(RenderObject* object, const RenderStyle* style, Color& fallbackColor)
129 {
130     return requestPaintingResource(ApplyToStrokeMode, object, style, fallbackColor);
131 }
132 
sharedSolidPaintingResource()133 RenderSVGResourceSolidColor* RenderSVGResource::sharedSolidPaintingResource()
134 {
135     static RenderSVGResourceSolidColor* s_sharedSolidPaintingResource = 0;
136     if (!s_sharedSolidPaintingResource)
137         s_sharedSolidPaintingResource = new RenderSVGResourceSolidColor;
138     return s_sharedSolidPaintingResource;
139 }
140 
markForLayoutAndParentResourceInvalidation(RenderObject * object,bool needsLayout)141 void RenderSVGResource::markForLayoutAndParentResourceInvalidation(RenderObject* object, bool needsLayout)
142 {
143     ASSERT(object);
144     if (needsLayout)
145         object->setNeedsLayout(true);
146 
147     // Invalidate resources in ancestor chain, if needed.
148     RenderObject* current = object->parent();
149     while (current) {
150         if (current->isSVGResourceContainer()) {
151             current->toRenderSVGResourceContainer()->removeAllClientsFromCache();
152             break;
153         }
154 
155         current = current->parent();
156     }
157 }
158 
159 }
160 
161 #endif
162