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      1 /*
      2     Copyright (C) Alex Mathews <possessedpenguinbob (at) gmail.com>
      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     aint 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(FILTERS)
     23 #include "FilterEffect.h"
     24 
     25 namespace WebCore {
     26 
     27 FilterEffect::FilterEffect()
     28     : m_hasX(false)
     29     , m_hasY(false)
     30     , m_hasWidth(false)
     31     , m_hasHeight(false)
     32     , m_alphaImage(false)
     33 {
     34 }
     35 
     36 FilterEffect::~FilterEffect()
     37 {
     38 }
     39 
     40 FloatRect FilterEffect::calculateUnionOfChildEffectSubregions(Filter* filter, FilterEffect* in)
     41 {
     42     return in->calculateEffectRect(filter);
     43 }
     44 
     45 FloatRect FilterEffect::calculateUnionOfChildEffectSubregions(Filter* filter, FilterEffect* in, FilterEffect* in2)
     46 {
     47     FloatRect uniteEffectRect = in->calculateEffectRect(filter);
     48     uniteEffectRect.unite(in2->calculateEffectRect(filter));
     49     return uniteEffectRect;
     50 }
     51 
     52 FloatRect FilterEffect::calculateEffectRect(Filter* filter)
     53 {
     54     setUnionOfChildEffectSubregions(uniteChildEffectSubregions(filter));
     55     filter->calculateEffectSubRegion(this);
     56     return subRegion();
     57 }
     58 
     59 IntRect FilterEffect::calculateDrawingIntRect(const FloatRect& effectRect)
     60 {
     61     IntPoint location = roundedIntPoint(FloatPoint(scaledSubRegion().x() - effectRect.x(),
     62                                                    scaledSubRegion().y() - effectRect.y()));
     63     return IntRect(location, resultImage()->size());
     64 }
     65 
     66 FloatRect FilterEffect::calculateDrawingRect(const FloatRect& srcRect)
     67 {
     68     FloatPoint startPoint = FloatPoint(srcRect.x() - scaledSubRegion().x(), srcRect.y() - scaledSubRegion().y());
     69     FloatRect drawingRect = FloatRect(startPoint, srcRect.size());
     70     return drawingRect;
     71 }
     72 
     73 GraphicsContext* FilterEffect::getEffectContext()
     74 {
     75     IntRect bufferRect = enclosingIntRect(scaledSubRegion());
     76     m_effectBuffer = ImageBuffer::create(bufferRect.size(), LinearRGB);
     77     return m_effectBuffer->context();
     78 }
     79 
     80 TextStream& FilterEffect::externalRepresentation(TextStream& ts) const
     81 {
     82     return ts;
     83 }
     84 
     85 } // namespace WebCore
     86 
     87 #endif // ENABLE(FILTERS)
     88