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/*
* Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2009 Google, Inc.
* Copyright (c) 2020, 2021, 2022 Igalia S.L.
*
* 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 "RenderSVGViewportContainer.h"
#include "RenderLayer.h"
#include "RenderSVGModelObjectInlines.h"
#include "RenderSVGRoot.h"
#include "SVGContainerLayout.h"
#include "SVGElementTypeHelpers.h"
#include "SVGSVGElement.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_IMPL(RenderSVGViewportContainer);
RenderSVGViewportContainer::RenderSVGViewportContainer(RenderSVGRoot& parent, RenderStyle&& style)
: RenderSVGContainer(Type::SVGViewportContainer, parent.document(), WTFMove(style))
, m_owningSVGRoot(parent)
{
ASSERT(isRenderSVGViewportContainer());
}
RenderSVGViewportContainer::RenderSVGViewportContainer(SVGSVGElement& element, RenderStyle&& style)
: RenderSVGContainer(Type::SVGViewportContainer, element, WTFMove(style))
{
ASSERT(isRenderSVGViewportContainer());
}
RenderSVGViewportContainer::~RenderSVGViewportContainer() = default;
SVGSVGElement& RenderSVGViewportContainer::svgSVGElement() const
{
if (isOutermostSVGViewportContainer()) {
ASSERT(m_owningSVGRoot);
return m_owningSVGRoot->svgSVGElement();
}
return downcast<SVGSVGElement>(RenderSVGContainer::element());
}
Ref<SVGSVGElement> RenderSVGViewportContainer::protectedSVGSVGElement() const
{
return svgSVGElement();
}
FloatPoint RenderSVGViewportContainer::computeViewportLocation() const
{
if (isOutermostSVGViewportContainer())
return { };
Ref useSVGSVGElement = svgSVGElement();
SVGLengthContext lengthContext(useSVGSVGElement.ptr());
return { useSVGSVGElement->x().value(lengthContext), useSVGSVGElement->y().value(lengthContext) };
}
FloatSize RenderSVGViewportContainer::computeViewportSize() const
{
if (isOutermostSVGViewportContainer())
return downcast<RenderSVGRoot>(*parent()).computeViewportSize();
Ref useSVGSVGElement = svgSVGElement();
SVGLengthContext lengthContext(useSVGSVGElement.ptr());
return { useSVGSVGElement->width().value(lengthContext), useSVGSVGElement->height().value(lengthContext) };
}
bool RenderSVGViewportContainer::updateLayoutSizeIfNeeded()
{
auto previousViewportSize = viewportSize();
m_viewport = { computeViewportLocation(), computeViewportSize() };
return selfNeedsLayout() || previousViewportSize != viewportSize();
}
bool RenderSVGViewportContainer::needsHasSVGTransformFlags() const
{
Ref useSVGSVGElement = svgSVGElement();
if (useSVGSVGElement->hasTransformRelatedAttributes())
return true;
if (isOutermostSVGViewportContainer())
return !useSVGSVGElement->currentTranslateValue().isZero() || useSVGSVGElement->renderer()->style().usedZoom() != 1;
return false;
}
void RenderSVGViewportContainer::updateFromStyle()
{
RenderSVGContainer::updateFromStyle();
if (SVGRenderSupport::isOverflowHidden(*this))
setHasNonVisibleOverflow();
}
inline AffineTransform viewBoxToViewTransform(const SVGSVGElement& svgSVGElement, const FloatSize& viewportSize)
{
return svgSVGElement.viewBoxToViewTransform(viewportSize.width(), viewportSize.height());
}
void RenderSVGViewportContainer::updateLayerTransform()
{
ASSERT(hasLayer());
// First update the supplemental layer transform.
Ref useSVGSVGElement = svgSVGElement();
auto viewportSize = this->viewportSize();
m_supplementalLayerTransform.makeIdentity();
if (isOutermostSVGViewportContainer()) {
// Handle pan - set on outermost <svg> element.
if (auto translation = useSVGSVGElement->currentTranslateValue(); !translation.isZero())
m_supplementalLayerTransform.translate(translation);
// Handle zoom - take effective zoom from outermost <svg> element.
if (auto scale = useSVGSVGElement->renderer()->style().usedZoom(); scale != 1) {
m_supplementalLayerTransform.scale(scale);
viewportSize.scale(1.0 / scale);
}
} else if (!m_viewport.location().isZero())
m_supplementalLayerTransform.translate(m_viewport.location());
if (useSVGSVGElement->hasAttribute(SVGNames::viewBoxAttr)) {
// An empty viewBox disables the rendering -- dirty the visible descendant status!
if (useSVGSVGElement->hasEmptyViewBox())
layer()->dirtyVisibleContentStatus();
else if (auto viewBoxTransform = viewBoxToViewTransform(useSVGSVGElement, viewportSize); !viewBoxTransform.isIdentity()) {
if (m_supplementalLayerTransform.isIdentity())
m_supplementalLayerTransform = viewBoxTransform;
else
m_supplementalLayerTransform.multiply(viewBoxTransform);
}
}
// After updating the supplemental layer transform we're able to use it in RenderLayerModelObjects::updateLayerTransform().
RenderSVGContainer::updateLayerTransform();
}
void RenderSVGViewportContainer::applyTransform(TransformationMatrix& transform, const RenderStyle& style, const FloatRect& boundingBox, OptionSet<RenderStyle::TransformOperationOption> options) const
{
applySVGTransform(transform, protectedSVGSVGElement(), style, boundingBox, m_supplementalLayerTransform.isIdentity() ? std::nullopt : std::make_optional(m_supplementalLayerTransform), std::nullopt, options);
}
LayoutRect RenderSVGViewportContainer::overflowClipRect(const LayoutPoint& location, OverlayScrollbarSizeRelevancy, PaintPhase) const
{
// Overflow for the outermost <svg> element is handled in RenderSVGRoot, not here.
ASSERT(!isOutermostSVGViewportContainer());
Ref useSVGSVGElement = svgSVGElement();
auto clipRect = enclosingLayoutRect(viewport());
if (useSVGSVGElement->hasAttribute(SVGNames::viewBoxAttr)) {
if (useSVGSVGElement->hasEmptyViewBox())
return { };
if (auto viewBoxTransform = viewBoxToViewTransform(useSVGSVGElement, viewportSize()); !viewBoxTransform.isIdentity())
clipRect = enclosingLayoutRect(viewBoxTransform.inverse().value_or(AffineTransform { }).mapRect(viewport()));
}
clipRect.moveBy(location);
return clipRect;
}
}
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