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      1 /*
      2  * Copyright (C) 2009 Dirk Schulze <krit (at) 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 
     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 
     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 
     56 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 
     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 
     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 
     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