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      1 /*
      2  * Copyright (C) 2010 University of Szeged
      3  * Copyright (C) 2010 Zoltan Herczeg
      4  * Copyright (C) 2011 Renata Hodovan (reni (at) webkit.org)
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
     19  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     22  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     23  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include "config.h"
     29 
     30 #include "core/rendering/svg/RenderSVGResourceFilterPrimitive.h"
     31 
     32 namespace WebCore {
     33 
     34 void RenderSVGResourceFilterPrimitive::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     35 {
     36     RenderSVGHiddenContainer::styleDidChange(diff, oldStyle);
     37 
     38     RenderObject* filter = parent();
     39     if (!filter)
     40         return;
     41     ASSERT(filter->isSVGResourceFilter());
     42 
     43     if (diff == StyleDifferenceEqual || !oldStyle)
     44         return;
     45 
     46     const SVGRenderStyle* newStyle = this->style()->svgStyle();
     47     if (node()->hasTagName(SVGNames::feFloodTag)) {
     48         if (newStyle->floodColor() != oldStyle->svgStyle()->floodColor())
     49             toRenderSVGFilter(filter)->primitiveAttributeChanged(this, SVGNames::flood_colorAttr);
     50         if (newStyle->floodOpacity() != oldStyle->svgStyle()->floodOpacity())
     51             toRenderSVGFilter(filter)->primitiveAttributeChanged(this, SVGNames::flood_opacityAttr);
     52     } else if (node()->hasTagName(SVGNames::feDiffuseLightingTag) || node()->hasTagName(SVGNames::feSpecularLightingTag)) {
     53         if (newStyle->lightingColor() != oldStyle->svgStyle()->lightingColor())
     54             toRenderSVGFilter(filter)->primitiveAttributeChanged(this, SVGNames::lighting_colorAttr);
     55     }
     56 }
     57 
     58 FloatRect RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(FilterEffect* effect)
     59 {
     60     SVGFilter* filter = static_cast<SVGFilter*>(effect->filter());
     61     ASSERT(filter);
     62 
     63     // FETile, FETurbulence, FEFlood don't have input effects, take the filter region as unite rect.
     64     FloatRect subregion;
     65     if (unsigned numberOfInputEffects = effect->inputEffects().size()) {
     66         subregion = determineFilterPrimitiveSubregion(effect->inputEffect(0));
     67         for (unsigned i = 1; i < numberOfInputEffects; ++i)
     68             subregion.unite(determineFilterPrimitiveSubregion(effect->inputEffect(i)));
     69     } else
     70         subregion = filter->filterRegion();
     71 
     72     // After calling determineFilterPrimitiveSubregion on the target effect, reset the subregion again for <feTile>.
     73     if (effect->filterEffectType() == FilterEffectTypeTile)
     74         subregion = filter->filterRegion();
     75 
     76     FloatRect effectBoundaries = effect->effectBoundaries();
     77     if (effect->hasX())
     78         subregion.setX(effectBoundaries.x());
     79     if (effect->hasY())
     80         subregion.setY(effectBoundaries.y());
     81     if (effect->hasWidth())
     82         subregion.setWidth(effectBoundaries.width());
     83     if (effect->hasHeight())
     84         subregion.setHeight(effectBoundaries.height());
     85 
     86     effect->setFilterPrimitiveSubregion(subregion);
     87 
     88     FloatRect absoluteSubregion = filter->absoluteTransform().mapRect(subregion);
     89     FloatSize filterResolution = filter->filterResolution();
     90     absoluteSubregion.scale(filterResolution.width(), filterResolution.height());
     91 
     92     // Clip every filter effect to the filter region.
     93     FloatRect absoluteScaledFilterRegion = filter->absoluteFilterRegion();
     94     absoluteScaledFilterRegion.scale(filterResolution.width(), filterResolution.height());
     95     absoluteSubregion.intersect(absoluteScaledFilterRegion);
     96 
     97     effect->setMaxEffectRect(absoluteSubregion);
     98     return subregion;
     99 }
    100 
    101 } // namespace WebCore
    102