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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 #if ENABLE(SVG) && ENABLE(FILTERS)
     31 #include "RenderSVGResourceFilterPrimitive.h"
     32 
     33 #include "RenderSVGResource.h"
     34 #include "SVGFEImage.h"
     35 #include "SVGFilter.h"
     36 #include "SVGNames.h"
     37 
     38 namespace WebCore {
     39 
     40 
     41 void RenderSVGResourceFilterPrimitive::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     42 {
     43     RenderSVGHiddenContainer::styleDidChange(diff, oldStyle);
     44 
     45     RenderObject* filter = parent();
     46     if (!filter)
     47         return;
     48     ASSERT(filter->isSVGResourceFilter());
     49 
     50     if (diff == StyleDifferenceEqual || !oldStyle)
     51         return;
     52 
     53     const SVGRenderStyle* newStyle = this->style()->svgStyle();
     54     if (node()->hasTagName(SVGNames::feFloodTag)) {
     55         if (newStyle->floodColor() != oldStyle->svgStyle()->floodColor())
     56             static_cast<RenderSVGResourceFilter*>(filter)->primitiveAttributeChanged(this, SVGNames::flood_colorAttr);
     57         if (newStyle->floodOpacity() != oldStyle->svgStyle()->floodOpacity())
     58             static_cast<RenderSVGResourceFilter*>(filter)->primitiveAttributeChanged(this, SVGNames::flood_opacityAttr);
     59     } else if (node()->hasTagName(SVGNames::feDiffuseLightingTag) || node()->hasTagName(SVGNames::feSpecularLightingTag)) {
     60         if (newStyle->lightingColor() != oldStyle->svgStyle()->lightingColor())
     61             static_cast<RenderSVGResourceFilter*>(filter)->primitiveAttributeChanged(this, SVGNames::lighting_colorAttr);
     62     }
     63 }
     64 
     65 FloatRect RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(FilterEffect* effect)
     66 {
     67     FloatRect uniteRect;
     68     FloatRect subregionBoundingBox = effect->effectBoundaries();
     69     FloatRect subregion = subregionBoundingBox;
     70     SVGFilter* filter = static_cast<SVGFilter*>(effect->filter());
     71     ASSERT(filter);
     72 
     73     if (effect->filterEffectType() != FilterEffectTypeTile) {
     74         // FETurbulence, FEImage and FEFlood don't have input effects, take the filter region as unite rect.
     75         if (unsigned numberOfInputEffects = effect->inputEffects().size()) {
     76             for (unsigned i = 0; i < numberOfInputEffects; ++i)
     77                 uniteRect.unite(determineFilterPrimitiveSubregion(effect->inputEffect(i)));
     78         } else
     79             uniteRect = filter->filterRegionInUserSpace();
     80     } else {
     81         determineFilterPrimitiveSubregion(effect->inputEffect(0));
     82         uniteRect = filter->filterRegionInUserSpace();
     83     }
     84 
     85     if (filter->effectBoundingBoxMode()) {
     86         subregion = uniteRect;
     87         // Avoid the calling of a virtual method several times.
     88         FloatRect targetBoundingBox = filter->targetBoundingBox();
     89 
     90         if (effect->hasX())
     91             subregion.setX(targetBoundingBox.x() + subregionBoundingBox.x() * targetBoundingBox.width());
     92 
     93         if (effect->hasY())
     94             subregion.setY(targetBoundingBox.y() + subregionBoundingBox.y() * targetBoundingBox.height());
     95 
     96         if (effect->hasWidth())
     97             subregion.setWidth(subregionBoundingBox.width() * targetBoundingBox.width());
     98 
     99         if (effect->hasHeight())
    100             subregion.setHeight(subregionBoundingBox.height() * targetBoundingBox.height());
    101     } else {
    102         if (!effect->hasX())
    103             subregion.setX(uniteRect.x());
    104 
    105         if (!effect->hasY())
    106             subregion.setY(uniteRect.y());
    107 
    108         if (!effect->hasWidth())
    109             subregion.setWidth(uniteRect.width());
    110 
    111         if (!effect->hasHeight())
    112             subregion.setHeight(uniteRect.height());
    113     }
    114 
    115     effect->setFilterPrimitiveSubregion(subregion);
    116 
    117     FloatRect absoluteSubregion = filter->mapLocalRectToAbsoluteRect(subregion);
    118     FloatSize filterResolution = filter->filterResolution();
    119     absoluteSubregion.scale(filterResolution.width(), filterResolution.height());
    120 
    121     // FEImage needs the unclipped subregion in absolute coordinates to determine the correct
    122     // destination rect in combination with preserveAspectRatio.
    123     if (effect->filterEffectType() == FilterEffectTypeImage)
    124         static_cast<FEImage*>(effect)->setAbsoluteSubregion(absoluteSubregion);
    125 
    126     // Clip every filter effect to the filter region.
    127     FloatRect absoluteScaledFilterRegion = filter->filterRegion();
    128     absoluteScaledFilterRegion.scale(filterResolution.width(), filterResolution.height());
    129     absoluteSubregion.intersect(absoluteScaledFilterRegion);
    130 
    131     effect->setMaxEffectRect(absoluteSubregion);
    132     return subregion;
    133 }
    134 
    135 } // namespace WebCore
    136 
    137 #endif // ENABLE(SVG) && ENABLE(FILTERS)
    138