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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.
*
* 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 "core/rendering/svg/RenderSVGViewportContainer.h"
#include "SVGNames.h"
#include "core/svg/SVGElementInstance.h"
#include "core/svg/SVGSVGElement.h"
#include "core/svg/SVGUseElement.h"
#include "platform/graphics/GraphicsContext.h"
namespace WebCore {
RenderSVGViewportContainer::RenderSVGViewportContainer(SVGElement* node)
: RenderSVGContainer(node)
, m_didTransformToRootUpdate(false)
, m_isLayoutSizeChanged(false)
, m_needsTransformUpdate(true)
{
}
void RenderSVGViewportContainer::determineIfLayoutSizeChanged()
{
if (!element()->hasTagName(SVGNames::svgTag))
return;
m_isLayoutSizeChanged = toSVGSVGElement(element())->hasRelativeLengths() && selfNeedsLayout();
}
void RenderSVGViewportContainer::applyViewportClip(PaintInfo& paintInfo)
{
if (SVGRenderSupport::isOverflowHidden(this))
paintInfo.context->clip(m_viewport);
}
void RenderSVGViewportContainer::calcViewport()
{
SVGElement* element = this->element();
if (!element->hasTagName(SVGNames::svgTag))
return;
SVGSVGElement* svg = toSVGSVGElement(element);
FloatRect oldViewport = m_viewport;
SVGLengthContext lengthContext(element);
m_viewport = FloatRect(svg->xCurrentValue().value(lengthContext), svg->yCurrentValue().value(lengthContext), svg->widthCurrentValue().value(lengthContext), svg->heightCurrentValue().value(lengthContext));
SVGElement* correspondingElement = svg->correspondingElement();
if (correspondingElement && svg->isInShadowTree()) {
const HashSet<SVGElementInstance*>& instances = correspondingElement->instancesForElement();
ASSERT(!instances.isEmpty());
SVGUseElement* useElement = 0;
const HashSet<SVGElementInstance*>::const_iterator end = instances.end();
for (HashSet<SVGElementInstance*>::const_iterator it = instances.begin(); it != end; ++it) {
const SVGElementInstance* instance = (*it);
ASSERT(instance->correspondingElement()->hasTagName(SVGNames::svgTag) || instance->correspondingElement()->hasTagName(SVGNames::symbolTag));
if (instance->shadowTreeElement() == svg) {
ASSERT(correspondingElement == instance->correspondingElement());
useElement = instance->directUseElement();
if (!useElement)
useElement = instance->correspondingUseElement();
break;
}
}
ASSERT(useElement);
bool isSymbolElement = correspondingElement->hasTagName(SVGNames::symbolTag);
// Spec (<use> on <symbol>): This generated 'svg' will always have explicit values for attributes width and height.
// If attributes width and/or height are provided on the 'use' element, then these attributes
// will be transferred to the generated 'svg'. If attributes width and/or height are not specified,
// the generated 'svg' element will use values of 100% for these attributes.
// Spec (<use> on <svg>): If attributes width and/or height are provided on the 'use' element, then these
// values will override the corresponding attributes on the 'svg' in the generated tree.
SVGLengthContext lengthContext(element);
if (useElement->hasAttribute(SVGNames::widthAttr))
m_viewport.setWidth(useElement->widthCurrentValue().value(lengthContext));
else if (isSymbolElement && svg->hasAttribute(SVGNames::widthAttr)) {
SVGLength containerWidth(LengthModeWidth, "100%");
m_viewport.setWidth(containerWidth.value(lengthContext));
}
if (useElement->hasAttribute(SVGNames::heightAttr))
m_viewport.setHeight(useElement->heightCurrentValue().value(lengthContext));
else if (isSymbolElement && svg->hasAttribute(SVGNames::heightAttr)) {
SVGLength containerHeight(LengthModeHeight, "100%");
m_viewport.setHeight(containerHeight.value(lengthContext));
}
}
if (oldViewport != m_viewport) {
setNeedsBoundariesUpdate();
setNeedsTransformUpdate();
}
}
bool RenderSVGViewportContainer::calculateLocalTransform()
{
m_didTransformToRootUpdate = m_needsTransformUpdate || SVGRenderSupport::transformToRootChanged(parent());
if (!m_needsTransformUpdate)
return false;
m_localToParentTransform = AffineTransform::translation(m_viewport.x(), m_viewport.y()) * viewportTransform();
m_needsTransformUpdate = false;
return true;
}
AffineTransform RenderSVGViewportContainer::viewportTransform() const
{
if (element()->hasTagName(SVGNames::svgTag)) {
SVGSVGElement* svg = toSVGSVGElement(element());
return svg->viewBoxToViewTransform(m_viewport.width(), m_viewport.height());
}
return AffineTransform();
}
bool RenderSVGViewportContainer::pointIsInsideViewportClip(const FloatPoint& pointInParent)
{
// Respect the viewport clip (which is in parent coords)
if (!SVGRenderSupport::isOverflowHidden(this))
return true;
return m_viewport.contains(pointInParent);
}
void RenderSVGViewportContainer::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
{
// An empty viewBox disables rendering.
if (element()->hasTagName(SVGNames::svgTag)) {
if (toSVGSVGElement(element())->hasEmptyViewBox())
return;
}
RenderSVGContainer::paint(paintInfo, paintOffset);
}
}
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