float SVGLength::PercentageOfViewport(float value, const SVGElement* context, SVGLengthMode mode)
{
ASSERT(context);
float width = 0.0f, height = 0.0f;
SVGElement* viewportElement = context->viewportElement();
// PercentageOfViewport() is used to resolve all relative-positioned values within a SVG document (fragment)
Document* doc = context->document();
if (doc->documentElement() == context) {
// Resolve value against outermost <svg> element
if (RenderView* view = toRenderView(doc->renderer())) {
width = view->viewWidth();
height = view->viewHeight();
}
} else if (viewportElement && viewportElement->isSVG()) {
// Resolve value against nearest viewport element (common case: inner <svg> elements)
const SVGSVGElement* svg = static_cast<const SVGSVGElement*>(viewportElement);
if (svg->hasAttribute(SVGNames::viewBoxAttr)) {
width = svg->viewBox().width();
height = svg->viewBox().height();
} else {
width = svg->width().value(svg);
height = svg->height().value(svg);
}
} else if (context->parent() && !context->parent()->isSVGElement()) {
// Resolve value against enclosing non-SVG RenderBox
if (RenderObject* renderer = context->renderer()) {
if (renderer->isBox()) {
RenderBox* box = toRenderBox(renderer);
width = box->width();
height = box->height();
}
}
}
if (mode == LengthModeWidth)
return value * width;
else if (mode == LengthModeHeight)
return value * height;
else if (mode == LengthModeOther)
return value * sqrtf(powf(width, 2) + powf(height, 2)) / sqrtf(2.0f);
return 0.0f;
}
bool SVGLength::determineViewport(const SVGElement* context, float& width, float& height) const
{
if (!context)
return false;
// Take size from outermost <svg> element.
Document* document = context->document();
if (document->documentElement() == context) {
if (RenderView* view = toRenderView(document->renderer())) {
width = view->viewWidth();
height = view->viewHeight();
return true;
}
return false;
}
// Resolve value against nearest viewport element (common case: inner <svg> elements)
SVGElement* viewportElement = context->viewportElement();
if (viewportElement && viewportElement->isSVG()) {
const SVGSVGElement* svg = static_cast<const SVGSVGElement*>(viewportElement);
if (svg->hasAttribute(SVGNames::viewBoxAttr)) {
width = svg->viewBox().width();
height = svg->viewBox().height();
} else {
width = svg->width().value(svg);
height = svg->height().value(svg);
}
return true;
}
// Resolve value against enclosing non-SVG RenderBox
if (!context->parentNode() || context->parentNode()->isSVGElement())
return false;
RenderObject* renderer = context->renderer();
if (!renderer || !renderer->isBox())
return false;
RenderBox* box = toRenderBox(renderer);
width = box->width();
height = box->height();
return true;
}
float SVGLength::PercentageOfViewport(float value, const SVGElement* context, SVGLengthMode mode)
{
ASSERT(context);
float width = 0.0f, height = 0.0f;
SVGElement* viewportElement = context->viewportElement();
Document* doc = context->document();
if (doc->documentElement() == context) {
// We have to ask the canvas for the full "canvas size"...
RenderView* view = toRenderView(doc->renderer());
if (view && view->frameView()) {
width = view->frameView()->visibleWidth(); // TODO: recheck!
height = view->frameView()->visibleHeight(); // TODO: recheck!
}
} else if (viewportElement && viewportElement->isSVG()) {
const SVGSVGElement* svg = static_cast<const SVGSVGElement*>(viewportElement);
if (svg->hasAttribute(SVGNames::viewBoxAttr)) {
width = svg->viewBox().width();
height = svg->viewBox().height();
} else {
width = svg->width().value(svg);
height = svg->height().value(svg);
}
} else if (context->parent() && !context->parent()->isSVGElement()) {
if (RenderObject* renderer = context->renderer()) {
if (renderer->isBox()) {
RenderBox* box = toRenderBox(renderer);
width = box->width();
height = box->height();
}
}
}
if (mode == LengthModeWidth)
return value * width;
else if (mode == LengthModeHeight)
return value * height;
else if (mode == LengthModeOther)
return value * sqrtf(powf(width, 2) + powf(height, 2)) / sqrtf(2.0f);
return 0.0f;
}
