1 /*
2 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
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 #include "config.h"
21
22 #if ENABLE(SVG) && ENABLE(FILTERS)
23 #include "SVGFilterBuilder.h"
24
25 #include "FilterEffect.h"
26 #include "PlatformString.h"
27 #include "SourceAlpha.h"
28 #include "SourceGraphic.h"
29
30 #include <wtf/PassRefPtr.h>
31
32 namespace WebCore {
33
SVGFilterBuilder(Filter * filter)34 SVGFilterBuilder::SVGFilterBuilder(Filter* filter)
35 : m_lastEffect(0)
36 {
37 m_builtinEffects.add(SourceGraphic::effectName(), SourceGraphic::create(filter));
38 m_builtinEffects.add(SourceAlpha::effectName(), SourceAlpha::create(filter));
39 addBuiltinEffects();
40 }
41
add(const AtomicString & id,RefPtr<FilterEffect> effect)42 void SVGFilterBuilder::add(const AtomicString& id, RefPtr<FilterEffect> effect)
43 {
44 if (id.isEmpty()) {
45 m_lastEffect = effect;
46 return;
47 }
48
49 if (m_builtinEffects.contains(id))
50 return;
51
52 m_lastEffect = effect;
53 m_namedEffects.set(id, m_lastEffect);
54 }
55
getEffectById(const AtomicString & id) const56 FilterEffect* SVGFilterBuilder::getEffectById(const AtomicString& id) const
57 {
58 if (id.isEmpty()) {
59 if (m_lastEffect)
60 return m_lastEffect.get();
61
62 return m_builtinEffects.get(SourceGraphic::effectName()).get();
63 }
64
65 if (m_builtinEffects.contains(id))
66 return m_builtinEffects.get(id).get();
67
68 return m_namedEffects.get(id).get();
69 }
70
appendEffectToEffectReferences(RefPtr<FilterEffect> effectReference,RenderObject * object)71 void SVGFilterBuilder::appendEffectToEffectReferences(RefPtr<FilterEffect> effectReference, RenderObject* object)
72 {
73 // The effect must be a newly created filter effect.
74 ASSERT(!m_effectReferences.contains(effectReference));
75 ASSERT(object && !m_effectRenderer.contains(object));
76 m_effectReferences.add(effectReference, FilterEffectSet());
77
78 FilterEffect* effect = effectReference.get();
79 unsigned numberOfInputEffects = effect->inputEffects().size();
80
81 // It is not possible to add the same value to a set twice.
82 for (unsigned i = 0; i < numberOfInputEffects; ++i)
83 effectReferences(effect->inputEffect(i)).add(effect);
84 m_effectRenderer.add(object, effectReference.get());
85 }
86
clearEffects()87 void SVGFilterBuilder::clearEffects()
88 {
89 m_lastEffect = 0;
90 m_namedEffects.clear();
91 m_effectReferences.clear();
92 m_effectRenderer.clear();
93 addBuiltinEffects();
94 }
95
clearResultsRecursive(FilterEffect * effect)96 void SVGFilterBuilder::clearResultsRecursive(FilterEffect* effect)
97 {
98 if (!effect->hasResult())
99 return;
100
101 effect->clearResult();
102
103 HashSet<FilterEffect*>& effectReferences = this->effectReferences(effect);
104 HashSet<FilterEffect*>::iterator end = effectReferences.end();
105 for (HashSet<FilterEffect*>::iterator it = effectReferences.begin(); it != end; ++it)
106 clearResultsRecursive(*it);
107 }
108
109 } // namespace WebCore
110
111 #endif // ENABLE(SVG) && ENABLE(FILTERS)
112