SVGResource* SVGFilterElement::canvasResource()
{
    if (!attached())
        return 0;

    if (!m_resourceFilter)
        m_resourceFilter = new SVGResourceFilter();
    
    FilterBuilder* builder;

    bool filterBBoxMode = filterUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
    m_resourceFilter->setFilterBoundingBoxMode(filterBBoxMode);

    float _x, _y, _width, _height;

    if (filterBBoxMode) {
        _x = x().valueAsPercentage();
        _y = y().valueAsPercentage();
        _width = width().valueAsPercentage();
        _height = height().valueAsPercentage();
    } else {
        m_resourceFilter->setXBoundingBoxMode(x().unitType() == LengthTypePercentage);
        m_resourceFilter->setYBoundingBoxMode(y().unitType() == LengthTypePercentage);

        _x = x().value();
        _y = y().value();
        _width = width().value();
        _height = height().value();
    } 

    m_resourceFilter->setFilterRect(FloatRect(_x, _y, _width, _height));

    bool primitiveBBoxMode = primitiveUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
    m_resourceFilter->setEffectBoundingBoxMode(primitiveBBoxMode);

    // TODO : use switch/case instead?
    m_resourceFilter->clearEffects();
    for (Node* n = firstChild(); n != 0; n = n->nextSibling()) {
        SVGElement* element = 0;
        if (n->isSVGElement())
            element = static_cast<SVGElement*>(n);
        if (element && element->isFilterEffect()) {
            printf("filterEffect found\n");
            SVGFilterPrimitiveStandardAttributes* effectElement = static_cast<SVGFilterPrimitiveStandardAttributes*>(element);
            
            if (effectElement->build(builder))
                continue;
        }
    }
    
    m_resourceFilter->setFilter(builder->filter());

    return m_resourceFilter.get();
}