SVGFilterElement.cpp   [plain text]

/*
    Copyright (C) 2004, 2005, 2006, 2007 Nikolas Zimmermann <zimmermann@kde.org>
    Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
    Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
    Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
    Copyright (C) Research In Motion Limited 2010. All rights reserved.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#include "config.h"

#if ENABLE(SVG) && ENABLE(FILTERS)
#include "SVGFilterElement.h"

#include "Attr.h"
#include "FloatSize.h"
#include "MappedAttribute.h"
#include "PlatformString.h"
#include "RenderSVGResourceFilter.h"
#include "SVGFilterBuilder.h"
#include "SVGFilterPrimitiveStandardAttributes.h"
#include "SVGLength.h"
#include "SVGNames.h"
#include "SVGParserUtilities.h"
#include "SVGUnitTypes.h"

namespace WebCore {

char SVGFilterResXIdentifier[] = "SVGFilterResX";
char SVGFilterResYIdentifier[] = "SVGFilterResY";

SVGFilterElement::SVGFilterElement(const QualifiedName& tagName, Document* doc)
    : SVGStyledElement(tagName, doc)
    , SVGURIReference()
    , SVGLangSpace()
    , SVGExternalResourcesRequired()
    , m_filterUnits(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
    , m_primitiveUnits(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE)
    , m_x(LengthModeWidth, "-10%")
    , m_y(LengthModeHeight, "-10%")
    , m_width(LengthModeWidth, "120%")
    , m_height(LengthModeHeight, "120%")
{
    // Spec: If the x/y attribute is not specified, the effect is as if a value of "-10%" were specified.
    // Spec: If the width/height attribute is not specified, the effect is as if a value of "120%" were specified.
}

SVGFilterElement::~SVGFilterElement()
{
}

void SVGFilterElement::setFilterRes(unsigned long, unsigned long) const
{
}

void SVGFilterElement::parseMappedAttribute(MappedAttribute* attr)
{
    const String& value = attr->value();
    if (attr->name() == SVGNames::filterUnitsAttr) {
        if (value == "userSpaceOnUse")
            setFilterUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        else if (value == "objectBoundingBox")
            setFilterUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
    } else if (attr->name() == SVGNames::primitiveUnitsAttr) {
        if (value == "userSpaceOnUse")
            setPrimitiveUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_USERSPACEONUSE);
        else if (value == "objectBoundingBox")
            setPrimitiveUnitsBaseValue(SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX);
    } else if (attr->name() == SVGNames::xAttr)
        setXBaseValue(SVGLength(LengthModeWidth, value));
    else if (attr->name() == SVGNames::yAttr)
        setYBaseValue(SVGLength(LengthModeHeight, value));
    else if (attr->name() == SVGNames::widthAttr)
        setWidthBaseValue(SVGLength(LengthModeWidth, value));
    else if (attr->name() == SVGNames::heightAttr)
        setHeightBaseValue(SVGLength(LengthModeHeight, value));
    else if (attr->name() == SVGNames::filterResAttr) {
        float x, y;
        if (parseNumberOptionalNumber(value, x, y)) {
            setFilterResXBaseValue(x);
            setFilterResYBaseValue(y);
        }
    } else {
        if (SVGURIReference::parseMappedAttribute(attr))
            return;
        if (SVGLangSpace::parseMappedAttribute(attr))
            return;
        if (SVGExternalResourcesRequired::parseMappedAttribute(attr))
            return;

        SVGStyledElement::parseMappedAttribute(attr);
    }
}

void SVGFilterElement::synchronizeProperty(const QualifiedName& attrName)
{
    SVGStyledElement::synchronizeProperty(attrName);

    if (attrName == anyQName()) {
        synchronizeX();
        synchronizeY();
        synchronizeWidth();
        synchronizeHeight();
        synchronizeFilterUnits();
        synchronizePrimitiveUnits();
        synchronizeFilterResX();
        synchronizeFilterResY();
        synchronizeExternalResourcesRequired();
        synchronizeHref();
        return;
    }

    if (attrName == SVGNames::xAttr)
        synchronizeX();
    else if (attrName == SVGNames::yAttr)
        synchronizeY();
    else if (attrName == SVGNames::widthAttr)
        synchronizeWidth();
    else if (attrName == SVGNames::heightAttr)
        synchronizeHeight();
    else if (attrName == SVGNames::filterUnitsAttr)
        synchronizeFilterUnits();
    else if (attrName == SVGNames::primitiveUnitsAttr)
        synchronizePrimitiveUnits();
    else if (attrName == SVGNames::filterResAttr) {
        synchronizeFilterResX();
        synchronizeFilterResY();
    } else if (SVGExternalResourcesRequired::isKnownAttribute(attrName))
        synchronizeExternalResourcesRequired();
    else if (SVGURIReference::isKnownAttribute(attrName))
        synchronizeHref();
}

FloatRect SVGFilterElement::filterBoundingBox(const FloatRect& objectBoundingBox) const
{
    FloatRect filterBBox;
    if (filterUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX)
        filterBBox = FloatRect(x().valueAsPercentage() * objectBoundingBox.width() + objectBoundingBox.x(),
                               y().valueAsPercentage() * objectBoundingBox.height() + objectBoundingBox.y(),
                               width().valueAsPercentage() * objectBoundingBox.width(),
                               height().valueAsPercentage() * objectBoundingBox.height());
    else
        filterBBox = FloatRect(x().value(this),
                               y().value(this),
                               width().value(this),
                               height().value(this));

    return filterBBox;
}

RenderObject* SVGFilterElement::createRenderer(RenderArena* arena, RenderStyle*)
{
    return new (arena) RenderSVGResourceFilter(this);
}
}

#endif