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(); } }