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#include "platform/graphics/filters/FilterEffect.h"
25#include "wtf/HashMap.h"
26#include "wtf/HashSet.h"
27#include "wtf/PassRefPtr.h"
28#include "wtf/text/AtomicStringHash.h"
29#include "wtf/text/WTFString.h"
30
31namespace blink {
32
33class RenderObject;
34
35class SVGFilterBuilder : public RefCounted<SVGFilterBuilder> {
36public:
37    typedef HashSet<FilterEffect*> FilterEffectSet;
38
39    static PassRefPtr<SVGFilterBuilder> create(PassRefPtr<FilterEffect> sourceGraphic, PassRefPtr<FilterEffect> sourceAlpha) { return adoptRef(new SVGFilterBuilder(sourceGraphic, sourceAlpha)); }
40
41    void add(const AtomicString& id, PassRefPtr<FilterEffect>);
42
43    FilterEffect* getEffectById(const AtomicString& id) const;
44    FilterEffect* lastEffect() const { return m_lastEffect.get(); }
45
46    void appendEffectToEffectReferences(PassRefPtr<FilterEffect>, RenderObject*);
47
48    inline FilterEffectSet& effectReferences(FilterEffect* effect)
49    {
50        // Only allowed for effects belongs to this builder.
51        ASSERT(m_effectReferences.contains(effect));
52        return m_effectReferences.find(effect)->value;
53    }
54
55    // Required to change the attributes of a filter during an svgAttributeChanged.
56    inline FilterEffect* effectByRenderer(RenderObject* object) { return m_effectRenderer.get(object); }
57
58    void clearEffects();
59    void clearResultsRecursive(FilterEffect*);
60
61private:
62    SVGFilterBuilder(PassRefPtr<FilterEffect> sourceGraphic, PassRefPtr<FilterEffect> sourceAlpha);
63
64    inline void addBuiltinEffects()
65    {
66        HashMap<AtomicString, RefPtr<FilterEffect> >::iterator end = m_builtinEffects.end();
67        for (HashMap<AtomicString, RefPtr<FilterEffect> >::iterator iterator = m_builtinEffects.begin(); iterator != end; ++iterator)
68             m_effectReferences.add(iterator->value, FilterEffectSet());
69    }
70
71    HashMap<AtomicString, RefPtr<FilterEffect> > m_builtinEffects;
72    HashMap<AtomicString, RefPtr<FilterEffect> > m_namedEffects;
73    // The value is a list, which contains those filter effects,
74    // which depends on the key filter effect.
75    HashMap<RefPtr<FilterEffect>, FilterEffectSet> m_effectReferences;
76    HashMap<RenderObject*, FilterEffect*> m_effectRenderer;
77
78    RefPtr<FilterEffect> m_lastEffect;
79};
80
81} // namespace blink
82
83#endif // SVGFilterBuilder_h
84