bool
APZController::GetRootZoomConstraints(ZoomConstraints* aOutConstraints)
{
if (aOutConstraints) {
// Until we support the meta-viewport tag properly allow zooming
// from 1/4 to 4x by default.
aOutConstraints->mAllowZoom = true;
aOutConstraints->mMinZoom = CSSToScreenScale(0.25f);
aOutConstraints->mMaxZoom = CSSToScreenScale(4.0f);
return true;
}
return false;
}
CSSToScreenScale
ThebesLayerComposite::GetEffectiveResolution()
{
for (ContainerLayer* parent = GetParent(); parent; parent = parent->GetParent()) {
const FrameMetrics& metrics = parent->GetFrameMetrics();
if (metrics.mScrollId != FrameMetrics::NULL_SCROLL_ID) {
return metrics.mZoom;
}
}
return CSSToScreenScale(1.0);
}
