1 /*
2  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
3  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Library General Public
7  * License as published by the Free Software Foundation; either
8  * version 2 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * Library General Public License for more details.
14  *
15  * You should have received a copy of the GNU Library General Public License
16  * along with this library; see the file COPYING.LIB.  If not, write to
17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18  * Boston, MA 02110-1301, USA.
19  */
20 
21 #ifndef SVGFilterBuilder_h
22 #define SVGFilterBuilder_h
23 
24 #if ENABLE(SVG) && ENABLE(FILTERS)
25 #include "FilterEffect.h"
26 #include "PlatformString.h"
27 #include "RenderObject.h"
28 
29 #include <wtf/HashMap.h>
30 #include <wtf/HashSet.h>
31 #include <wtf/PassRefPtr.h>
32 #include <wtf/text/AtomicStringHash.h>
33 
34 namespace WebCore {
35 
36 class SVGFilterBuilder : public RefCounted<SVGFilterBuilder> {
37 public:
38     typedef HashSet<FilterEffect*> FilterEffectSet;
39 
create(Filter * filter)40     static PassRefPtr<SVGFilterBuilder> create(Filter* filter) { return adoptRef(new SVGFilterBuilder(filter)); }
41 
42     void add(const AtomicString& id, RefPtr<FilterEffect> effect);
43 
44     FilterEffect* getEffectById(const AtomicString& id) const;
lastEffect()45     FilterEffect* lastEffect() const { return m_lastEffect.get(); }
46 
47     void appendEffectToEffectReferences(RefPtr<FilterEffect>, RenderObject*);
48 
effectReferences(FilterEffect * effect)49     inline FilterEffectSet& effectReferences(FilterEffect* effect)
50     {
51         // Only allowed for effects belongs to this builder.
52         ASSERT(m_effectReferences.contains(effect));
53         return m_effectReferences.find(effect)->second;
54     }
55 
56     // Required to change the attributes of a filter during an svgAttributeChanged.
effectByRenderer(RenderObject * object)57     inline FilterEffect* effectByRenderer(RenderObject* object) { return m_effectRenderer.get(object); }
58 
59     void clearEffects();
60     void clearResultsRecursive(FilterEffect*);
61 
62 private:
63     SVGFilterBuilder(Filter*);
64 
addBuiltinEffects()65     inline void addBuiltinEffects()
66     {
67         HashMap<AtomicString, RefPtr<FilterEffect> >::iterator end = m_builtinEffects.end();
68         for (HashMap<AtomicString, RefPtr<FilterEffect> >::iterator iterator = m_builtinEffects.begin(); iterator != end; ++iterator)
69              m_effectReferences.add(iterator->second, FilterEffectSet());
70     }
71 
72     HashMap<AtomicString, RefPtr<FilterEffect> > m_builtinEffects;
73     HashMap<AtomicString, RefPtr<FilterEffect> > m_namedEffects;
74     // The value is a list, which contains those filter effects,
75     // which depends on the key filter effect.
76     HashMap<RefPtr<FilterEffect>, FilterEffectSet> m_effectReferences;
77     HashMap<RenderObject*, FilterEffect*> m_effectRenderer;
78 
79     RefPtr<FilterEffect> m_lastEffect;
80 };
81 
82 } // namespace WebCore
83 
84 #endif // ENABLE(SVG) && ENABLE(FILTERS)
85 #endif // SVGFilterBuilder_h
86