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