AffineTransform SVGSVGElement::localCoordinateSpaceTransform(
SVGElement::CTMScope mode) const {
AffineTransform viewBoxTransform;
if (!hasEmptyViewBox()) {
FloatSize size = currentViewportSize();
viewBoxTransform = viewBoxToViewTransform(size.width(), size.height());
}
AffineTransform transform;
if (!isOutermostSVGSVGElement()) {
SVGLengthContext lengthContext(this);
transform.translate(m_x->currentValue()->value(lengthContext),
m_y->currentValue()->value(lengthContext));
} else if (mode == SVGElement::ScreenScope) {
if (LayoutObject* layoutObject = this->layoutObject()) {
FloatPoint location;
float zoomFactor = 1;
// At the SVG/HTML boundary (aka LayoutSVGRoot), we apply the
// localToBorderBoxTransform to map an element from SVG viewport
// coordinates to CSS box coordinates. LayoutSVGRoot's localToAbsolute
// method expects CSS box coordinates. We also need to adjust for the
// zoom level factored into CSS coordinates (bug #96361).
if (layoutObject->isSVGRoot()) {
location = toLayoutSVGRoot(layoutObject)
->localToBorderBoxTransform()
.mapPoint(location);
zoomFactor = 1 / layoutObject->style()->effectiveZoom();
}
// Translate in our CSS parent coordinate space
// FIXME: This doesn't work correctly with CSS transforms.
location = layoutObject->localToAbsolute(location, UseTransforms);
location.scale(zoomFactor, zoomFactor);
// Be careful here! localToBorderBoxTransform() included the x/y offset
// coming from the viewBoxToViewTransform(), so we have to subtract it
// here (original cause of bug #27183)
transform.translate(location.x() - viewBoxTransform.e(),
location.y() - viewBoxTransform.f());
// Respect scroll offset.
if (FrameView* view = document().view()) {
LayoutSize scrollOffset(view->getScrollOffset());
scrollOffset.scale(zoomFactor);
transform.translate(-scrollOffset.width(), -scrollOffset.height());
}
}
}
return transform.multiply(viewBoxTransform);
}
AffineTransform SVGSVGElement::localCoordinateSpaceTransform(SVGLocatable::CTMScope mode) const
{
AffineTransform viewBoxTransform;
if (!hasEmptyViewBox()) {
FloatSize size = currentViewportSize();
viewBoxTransform = viewBoxToViewTransform(size.width(), size.height());
}
AffineTransform transform;
if (!isOutermostSVGSVGElement()) {
SVGLengthContext lengthContext(this);
transform.translate(x().value(lengthContext), y().value(lengthContext));
} else if (mode == SVGLocatable::ScreenScope) {
if (auto* renderer = this->renderer()) {
FloatPoint location;
float zoomFactor = 1;
// At the SVG/HTML boundary (aka RenderSVGRoot), we apply the localToBorderBoxTransform
// to map an element from SVG viewport coordinates to CSS box coordinates.
// RenderSVGRoot's localToAbsolute method expects CSS box coordinates.
// We also need to adjust for the zoom level factored into CSS coordinates (bug #96361).
if (is<RenderSVGRoot>(*renderer)) {
location = downcast<RenderSVGRoot>(*renderer).localToBorderBoxTransform().mapPoint(location);
zoomFactor = 1 / renderer->style().effectiveZoom();
}
// Translate in our CSS parent coordinate space
// FIXME: This doesn't work correctly with CSS transforms.
location = renderer->localToAbsolute(location, UseTransforms);
location.scale(zoomFactor);
// Be careful here! localToBorderBoxTransform() included the x/y offset coming from the viewBoxToViewTransform(),
// so we have to subtract it here (original cause of bug #27183)
transform.translate(location.x() - viewBoxTransform.e(), location.y() - viewBoxTransform.f());
// Respect scroll offset.
if (FrameView* view = document().view()) {
LayoutPoint scrollPosition = view->scrollPosition();
scrollPosition.scale(zoomFactor);
transform.translate(-scrollPosition.x(), -scrollPosition.y());
}
}
}
return transform.multiply(viewBoxTransform);
}
