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SVGResourceFilter.cpp

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00001 /*
00002     Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
00003                   2004, 2005 Rob Buis <buis@kde.org>
00004                   2005 Eric Seidel <eric@webkit.org>
00005 
00006     This library is free software; you can redistribute it and/or
00007     modify it under the terms of the GNU Library General Public
00008     License as published by the Free Software Foundation; either
00009     version 2 of the License, or (at your option) any later version.
00010 
00011     This library is distributed in the hope that it will be useful,
00012     but WITHOUT ANY WARRANTY; without even the implied warranty of
00013     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014     Library General Public License for more details.
00015 
00016     You should have received a copy of the GNU Library General Public License
00017     aint with this library; see the file COPYING.LIB.  If not, write to
00018     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00019     Boston, MA 02110-1301, USA.
00020 */
00021 
00022 #include "config.h"
00023 
00024 #if ENABLE(SVG) && ENABLE(SVG_FILTERS)
00025 #include "SVGResourceFilter.h"
00026 
00027 #include "SVGRenderTreeAsText.h"
00028 #include "SVGFilterEffect.h"
00029 
00030 namespace WebCore {
00031 
00032 SVGResourceFilter::SVGResourceFilter()
00033     : m_platformData(createPlatformData())
00034     , m_filterBBoxMode(false)
00035     , m_effectBBoxMode(false)
00036     , m_xBBoxMode(false)
00037     , m_yBBoxMode(false)
00038 {
00039 }
00040 
00041 void SVGResourceFilter::clearEffects()
00042 {
00043     m_effects.clear();
00044 }
00045 
00046 void SVGResourceFilter::addFilterEffect(SVGFilterEffect* effect)
00047 {
00048     ASSERT(effect);
00049 
00050     if (effect) {
00051         ASSERT(effect->filter() == this);
00052         m_effects.append(effect);
00053     }
00054 }
00055 
00056 FloatRect SVGResourceFilter::filterBBoxForItemBBox(const FloatRect& itemBBox) const
00057 {
00058     FloatRect filterBBox = filterRect();
00059 
00060     float xOffset = 0.0f;
00061     float yOffset = 0.0f;
00062 
00063     if (!effectBoundingBoxMode()) {
00064         xOffset = itemBBox.x();
00065         yOffset = itemBBox.y();
00066     }
00067 
00068     if (filterBoundingBoxMode()) {
00069         filterBBox = FloatRect(xOffset + filterBBox.x() * itemBBox.width(),
00070                                yOffset + filterBBox.y() * itemBBox.height(),
00071                                filterBBox.width() * itemBBox.width(),
00072                                filterBBox.height() * itemBBox.height());
00073     } else {
00074         if (xBoundingBoxMode())
00075             filterBBox.setX(xOffset + filterBBox.x());
00076 
00077         if (yBoundingBoxMode())
00078             filterBBox.setY(yOffset + filterBBox.y());
00079     }
00080 
00081     return filterBBox;
00082 }
00083 
00084 TextStream& SVGResourceFilter::externalRepresentation(TextStream& ts) const
00085 {
00086     ts << "[type=FILTER] ";
00087 
00088     FloatRect bbox = filterRect();
00089     static FloatRect defaultFilterRect(0, 0, 1, 1);
00090 
00091     if (!filterBoundingBoxMode() || bbox != defaultFilterRect) {
00092         ts << " [bounding box=";
00093         if (filterBoundingBoxMode()) {
00094             bbox.scale(100.f);
00095             ts << "at (" << bbox.x() << "%," <<  bbox.y() << "%) size " << bbox.width() << "%x" << bbox.height() << "%";
00096         } else
00097             ts << filterRect();
00098         ts << "]";
00099     }
00100 
00101     if (!filterBoundingBoxMode()) // default is true
00102         ts << " [bounding box mode=" << filterBoundingBoxMode() << "]";
00103     if (effectBoundingBoxMode()) // default is false
00104         ts << " [effect bounding box mode=" << effectBoundingBoxMode() << "]";
00105     if (m_effects.size() > 0)
00106         ts << " [effects=" << m_effects << "]";
00107 
00108     return ts;
00109 }
00110 
00111 SVGResourceFilter* getFilterById(Document* document, const AtomicString& id)
00112 {
00113     SVGResource* resource = getResourceById(document, id);
00114     if (resource && resource->isFilter())
00115         return static_cast<SVGResourceFilter*>(resource);
00116 
00117     return 0;
00118 }
00119 
00120 
00121 } // namespace WebCore
00122 
00123 #endif // ENABLE(SVG)

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