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      1 /*
      2  * Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      3  * Copyright (C) 2004, 2005 Rob Buis <buis (at) kde.org>
      4  * Copyright (C) 2005 Eric Seidel <eric (at) webkit.org>
      5  *
      6  * This library is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Library General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2 of the License, or (at your option) any later version.
     10  *
     11  * This library is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Library General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Library General Public License
     17  * along with this library; see the file COPYING.LIB.  If not, write to
     18  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     19  * Boston, MA 02110-1301, USA.
     20  */
     21 
     22 #include "config.h"
     23 
     24 #if ENABLE(FILTERS)
     25 #include "FEMerge.h"
     26 
     27 #include "Filter.h"
     28 #include "GraphicsContext.h"
     29 #include "RenderTreeAsText.h"
     30 #include "TextStream.h"
     31 
     32 namespace WebCore {
     33 
     34 FEMerge::FEMerge(Filter* filter)
     35     : FilterEffect(filter)
     36 {
     37 }
     38 
     39 PassRefPtr<FEMerge> FEMerge::create(Filter* filter)
     40 {
     41     return adoptRef(new FEMerge(filter));
     42 }
     43 
     44 void FEMerge::apply()
     45 {
     46     if (hasResult())
     47         return;
     48     unsigned size = numberOfEffectInputs();
     49     ASSERT(size > 0);
     50     for (unsigned i = 0; i < size; ++i) {
     51         FilterEffect* in = inputEffect(i);
     52         in->apply();
     53         if (!in->hasResult())
     54             return;
     55     }
     56 
     57     ImageBuffer* resultImage = createImageBufferResult();
     58     if (!resultImage)
     59         return;
     60 
     61     GraphicsContext* filterContext = resultImage->context();
     62     for (unsigned i = 0; i < size; ++i) {
     63         FilterEffect* in = inputEffect(i);
     64         filterContext->drawImageBuffer(in->asImageBuffer(), ColorSpaceDeviceRGB, drawingRegionOfInputImage(in->absolutePaintRect()));
     65     }
     66 }
     67 
     68 void FEMerge::dump()
     69 {
     70 }
     71 
     72 TextStream& FEMerge::externalRepresentation(TextStream& ts, int indent) const
     73 {
     74     writeIndent(ts, indent);
     75     ts << "[feMerge";
     76     FilterEffect::externalRepresentation(ts);
     77     unsigned size = numberOfEffectInputs();
     78     ASSERT(size > 0);
     79     ts << " mergeNodes=\"" << size << "\"]\n";
     80     for (unsigned i = 0; i < size; ++i)
     81         inputEffect(i)->externalRepresentation(ts, indent + 1);
     82     return ts;
     83 }
     84 
     85 } // namespace WebCore
     86 
     87 #endif // ENABLE(FILTERS)
     88