void RenderSVGViewportContainer::calcViewport()
{
SVGElement* element = toSVGElement(node());
if (!element->hasTagName(SVGNames::svgTag))
return;
SVGSVGElement* svg = toSVGSVGElement(element);
FloatRect oldViewport = m_viewport;
SVGLengthContext lengthContext(element);
m_viewport = FloatRect(svg->x().value(lengthContext), svg->y().value(lengthContext), svg->width().value(lengthContext), svg->height().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->width().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->height().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();
}
}
