blob: bbe16d40a982c422042f9a009a64e809faeba29f [file] [log] [blame]
/*
* Copyright (C) 2005 Oliver Hunt <ojh16@student.canterbury.ac.nz>
*
* 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"
#include "SVGFESpotLightElement.h"
#include "FilterEffectVector.h"
#include "GeometryUtilities.h"
#include "ImageBuffer.h"
#include "SVGFilterBuilder.h"
#include "SVGNames.h"
#include "SpotLightSource.h"
#include <wtf/MathExtras.h>
namespace WebCore {
inline SVGFESpotLightElement::SVGFESpotLightElement(const QualifiedName& tagName, Document& document)
: SVGFELightElement(tagName, document)
{
ASSERT(hasTagName(SVGNames::feSpotLightTag));
}
Ref<SVGFESpotLightElement> SVGFESpotLightElement::create(const QualifiedName& tagName, Document& document)
{
return adoptRef(*new SVGFESpotLightElement(tagName, document));
}
Ref<LightSource> SVGFESpotLightElement::lightSource(const SVGFilterBuilder& builder) const
{
FloatPoint3D position;
FloatPoint3D pointsAt;
if (builder.primitiveUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) {
FloatRect referenceBox = builder.targetBoundingBox();
position.setX(referenceBox.x() + x() * referenceBox.width());
position.setY(referenceBox.y() + y() * referenceBox.height());
// https://www.w3.org/TR/SVG/filters.html#fePointLightZAttribute and https://www.w3.org/TR/SVG/coords.html#Units_viewport_percentage
position.setZ(z() * euclidianDistance(referenceBox.minXMinYCorner(), referenceBox.maxXMaxYCorner()) / sqrtOfTwoFloat);
pointsAt.setX(referenceBox.x() + pointsAtX() * referenceBox.width());
pointsAt.setY(referenceBox.y() + pointsAtY() * referenceBox.height());
// https://www.w3.org/TR/SVG/filters.html#fePointLightZAttribute and https://www.w3.org/TR/SVG/coords.html#Units_viewport_percentage
pointsAt.setZ(pointsAtZ() * euclidianDistance(referenceBox.minXMinYCorner(), referenceBox.maxXMaxYCorner()) / sqrtOfTwoFloat);
} else {
position = FloatPoint3D(x(), y(), z());
pointsAt = FloatPoint3D(pointsAtX(), pointsAtY(), pointsAtZ());
}
return SpotLightSource::create(position, pointsAt, specularExponent(), limitingConeAngle());
}
}