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#include "core/svg/graphics/filters/SVGFilterBuilder.h"
22
23#include "platform/graphics/filters/SourceAlpha.h"
24#include "platform/graphics/filters/SourceGraphic.h"
25
26namespace blink {
27
28SVGFilterBuilder::SVGFilterBuilder(PassRefPtr<FilterEffect> sourceGraphic, PassRefPtr<FilterEffect> sourceAlpha)
29{
30    m_builtinEffects.add(SourceGraphic::effectName(), sourceGraphic);
31    m_builtinEffects.add(SourceAlpha::effectName(), sourceAlpha);
32    addBuiltinEffects();
33}
34
35void SVGFilterBuilder::add(const AtomicString& id, PassRefPtr<FilterEffect> effect)
36{
37    if (id.isEmpty()) {
38        m_lastEffect = effect;
39        return;
40    }
41
42    if (m_builtinEffects.contains(id))
43        return;
44
45    m_lastEffect = effect;
46    m_namedEffects.set(id, m_lastEffect);
47}
48
49FilterEffect* SVGFilterBuilder::getEffectById(const AtomicString& id) const
50{
51    if (!id.isEmpty()) {
52        if (FilterEffect* builtinEffect = m_builtinEffects.get(id))
53            return builtinEffect;
54
55        if (FilterEffect* namedEffect = m_namedEffects.get(id))
56            return namedEffect;
57    }
58
59    if (m_lastEffect)
60        return m_lastEffect.get();
61
62    return m_builtinEffects.get(SourceGraphic::effectName());
63}
64
65void SVGFilterBuilder::appendEffectToEffectReferences(PassRefPtr<FilterEffect> prpEffect, RenderObject* object)
66{
67    RefPtr<FilterEffect> effect = prpEffect;
68
69    // The effect must be a newly created filter effect.
70    ASSERT(!m_effectReferences.contains(effect));
71    ASSERT(object && !m_effectRenderer.contains(object));
72    m_effectReferences.add(effect, FilterEffectSet());
73
74    unsigned numberOfInputEffects = effect->inputEffects().size();
75
76    // It is not possible to add the same value to a set twice.
77    for (unsigned i = 0; i < numberOfInputEffects; ++i)
78        effectReferences(effect->inputEffect(i)).add(effect.get());
79    m_effectRenderer.add(object, effect.get());
80}
81
82void SVGFilterBuilder::clearEffects()
83{
84    m_lastEffect = nullptr;
85    m_namedEffects.clear();
86    m_effectReferences.clear();
87    m_effectRenderer.clear();
88    addBuiltinEffects();
89}
90
91void SVGFilterBuilder::clearResultsRecursive(FilterEffect* effect)
92{
93    if (!effect->hasResult() && !effect->hasImageFilter())
94        return;
95
96    effect->clearResult();
97
98    HashSet<FilterEffect*>& effectReferences = this->effectReferences(effect);
99    HashSet<FilterEffect*>::iterator end = effectReferences.end();
100    for (HashSet<FilterEffect*>::iterator it = effectReferences.begin(); it != end; ++it)
101         clearResultsRecursive(*it);
102}
103
104} // namespace blink
105