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      1 /*
      2  * Copyright (C) Research In Motion Limited 2009-2010. 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 #ifndef RenderSVGResource_h
     21 #define RenderSVGResource_h
     22 
     23 #include "core/rendering/svg/RenderSVGShape.h"
     24 #include "core/svg/SVGDocumentExtensions.h"
     25 
     26 namespace WebCore {
     27 
     28 enum RenderSVGResourceType {
     29     MaskerResourceType,
     30     MarkerResourceType,
     31     PatternResourceType,
     32     LinearGradientResourceType,
     33     RadialGradientResourceType,
     34     SolidColorResourceType,
     35     FilterResourceType,
     36     ClipperResourceType
     37 };
     38 
     39 // If this enum changes change the unsigned bitfields using it.
     40 enum RenderSVGResourceMode {
     41     ApplyToDefaultMode = 1 << 0, // used for all resources except gradient/pattern
     42     ApplyToFillMode    = 1 << 1,
     43     ApplyToStrokeMode  = 1 << 2,
     44     ApplyToTextMode    = 1 << 3 // used in combination with ApplyTo{Fill|Stroke}Mode
     45 };
     46 typedef unsigned RenderSVGResourceModeFlags;
     47 
     48 class GraphicsContext;
     49 class Path;
     50 class RenderObject;
     51 class RenderStyle;
     52 class RenderSVGResourceSolidColor;
     53 
     54 class RenderSVGResource {
     55 public:
     56     RenderSVGResource() { }
     57     virtual ~RenderSVGResource() { }
     58 
     59     virtual void removeAllClientsFromCache(bool markForInvalidation = true) = 0;
     60     virtual void removeClientFromCache(RenderObject*, bool markForInvalidation = true) = 0;
     61 
     62     virtual bool applyResource(RenderObject*, RenderStyle*, GraphicsContext*&, unsigned short resourceMode) = 0;
     63     virtual void postApplyResource(RenderObject*, GraphicsContext*&, unsigned short, const Path*, const RenderSVGShape*) { }
     64 
     65     virtual RenderSVGResourceType resourceType() const = 0;
     66 
     67     template<class Renderer>
     68     Renderer* cast()
     69     {
     70         if (Renderer::s_resourceType == resourceType())
     71             return static_cast<Renderer*>(this);
     72 
     73         return 0;
     74     }
     75 
     76     // Helper utilities used in the render tree to access resources used for painting shapes/text (gradients & patterns & solid colors only)
     77     // If hasFallback gets set to true, the sharedSolidPaintingResource is set to a fallback color.
     78     static RenderSVGResource* fillPaintingResource(RenderObject*, const RenderStyle*, bool& hasFallback);
     79     static RenderSVGResource* strokePaintingResource(RenderObject*, const RenderStyle*, bool& hasFallback);
     80     static RenderSVGResourceSolidColor* sharedSolidPaintingResource();
     81 
     82     static void markForLayoutAndParentResourceInvalidation(RenderObject*, bool needsLayout = true);
     83 };
     84 
     85 #define DEFINE_RENDER_SVG_RESOURCE_TYPE_CASTS(thisType, typeName) \
     86     DEFINE_TYPE_CASTS(thisType, RenderSVGResource, resource, resource->resourceType() == typeName, resource.resourceType() == typeName)
     87 
     88 }
     89 
     90 #endif
     91