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
34namespace WebCore {
35
36class SVGFilterBuilder : public RefCounted<SVGFilterBuilder> {
37public:
38    typedef HashSet<FilterEffect*> FilterEffectSet;
39
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;
45    FilterEffect* lastEffect() const { return m_lastEffect.get(); }
46
47    void appendEffectToEffectReferences(RefPtr<FilterEffect>, RenderObject*);
48
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.
57    inline FilterEffect* effectByRenderer(RenderObject* object) { return m_effectRenderer.get(object); }
58
59    void clearEffects();
60    void clearResultsRecursive(FilterEffect*);
61
62private:
63    SVGFilterBuilder(Filter*);
64
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