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/*
* Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
* Copyright (C) 2009 Google, Inc. All rights reserved.
* 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"
#include "SVGLocatable.h"
#include "RenderElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGGraphicsElement.h"
#include "SVGImageElement.h"
#include "SVGLayerTransformComputation.h"
#include "SVGMatrix.h"
#include "SVGNames.h"
#include "TransformState.h"
namespace WebCore {
// FIXME: This doesn't match SVGElement::viewportElement() as it has an extra check for
// foreign object.
static bool isViewportElement(const SVGElement* element)
{
if (!element)
return false;
return element->hasTagName(SVGNames::svgTag)
|| element->hasTagName(SVGNames::symbolTag)
|| element->hasTagName(SVGNames::foreignObjectTag)
|| is<SVGImageElement>(*element);
}
SVGElement* SVGLocatable::nearestViewportElement(const SVGElement* element)
{
ASSERT(element);
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
auto* svgElement = dynamicDowncast<SVGElement>(*current);
if (isViewportElement(svgElement))
return svgElement;
}
return nullptr;
}
SVGElement* SVGLocatable::farthestViewportElement(const SVGElement* element)
{
ASSERT(element);
SVGElement* farthest = nullptr;
for (Element* current = element->parentOrShadowHostElement(); current; current = current->parentOrShadowHostElement()) {
auto* svgElement = dynamicDowncast<SVGElement>(*current);
if (isViewportElement(svgElement))
farthest = svgElement;
}
return farthest;
}
FloatRect SVGLocatable::getBBox(SVGElement* element, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets({ LayoutOptions::ContentVisibilityForceLayout }, element);
// FIXME: Eventually we should support getBBox for detached elements.
if (!element->renderer())
return FloatRect();
return element->renderer()->objectBoundingBox();
}
AffineTransform SVGLocatable::computeCTM(SVGElement* element, CTMScope mode, StyleUpdateStrategy styleUpdateStrategy)
{
ASSERT(element);
if (styleUpdateStrategy == AllowStyleUpdate)
element->document().updateLayoutIgnorePendingStylesheets({ LayoutOptions::ContentVisibilityForceLayout }, element);
SVGElement* stopAtElement = mode == NearestViewportScope ? nearestViewportElement(element) : nullptr;
#if ENABLE(LAYER_BASED_SVG_ENGINE)
if (element->document().settings().layerBasedSVGEngineEnabled()) {
// Rudimentary support for operations on "detached" elements.
auto* renderer = dynamicDowncast<RenderLayerModelObject>(element->renderer());
if (!renderer)
return element->localCoordinateSpaceTransform(mode);
auto trackingMode { mode == SVGLocatable::ScreenScope ? TransformState::TrackSVGScreenCTMMatrix : TransformState::TrackSVGCTMMatrix };
auto* stopAtRenderer = dynamicDowncast<RenderLayerModelObject>(stopAtElement ? stopAtElement->renderer() : nullptr);
return SVGLayerTransformComputation(*renderer).computeAccumulatedTransform(stopAtRenderer, trackingMode);
}
#endif
AffineTransform ctm;
for (Element* currentElement = element; currentElement; currentElement = currentElement->parentOrShadowHostElement()) {
auto* svgElement = dynamicDowncast<SVGElement>(*currentElement);
if (!svgElement)
break;
ctm = svgElement->localCoordinateSpaceTransform(mode).multiply(ctm);
// For getCTM() computation, stop at the nearest viewport element
if (currentElement == stopAtElement)
break;
}
return ctm;
}
ExceptionOr<Ref<SVGMatrix>> SVGLocatable::getTransformToElement(SVGElement* target, StyleUpdateStrategy styleUpdateStrategy)
{
AffineTransform ctm = getCTM(styleUpdateStrategy);
if (auto* graphicsElement = dynamicDowncast<SVGGraphicsElement>(target)) {
AffineTransform targetCTM = graphicsElement->getCTM(styleUpdateStrategy);
if (auto inverse = targetCTM.inverse())
ctm = inverse.value() * ctm;
else
return Exception { ExceptionCode::InvalidStateError, "Matrix is not invertible"_s };
}
return SVGMatrix::create(ctm);
}
}
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