static PRUint64
PackPreserveAspectRatio(const SVGPreserveAspectRatio& par)
{
// All preserveAspectRatio values are enum values (do not interpolate), so we
// can safely collate them and treat them as a single enum as for SMIL.
PRUint64 packed = 0;
packed |= PRUint64(par.GetDefer() ? 1 : 0) << 16;
packed |= PRUint64(par.GetAlign()) << 8;
packed |= PRUint64(par.GetMeetOrSlice());
return packed;
}
static nsresult
ToPreserveAspectRatio(const nsAString &aString,
SVGPreserveAspectRatio *aValue)
{
if (aString.IsEmpty() || NS_IsAsciiWhitespace(aString[0])) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
nsWhitespaceTokenizer tokenizer(aString);
if (!tokenizer.hasMoreTokens()) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
const nsAString &token = tokenizer.nextToken();
nsresult rv;
SVGPreserveAspectRatio val;
val.SetDefer(token.EqualsLiteral("defer"));
if (val.GetDefer()) {
if (!tokenizer.hasMoreTokens()) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
rv = val.SetAlign(GetAlignForString(tokenizer.nextToken()));
} else {
rv = val.SetAlign(GetAlignForString(token));
}
if (NS_FAILED(rv)) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
if (tokenizer.hasMoreTokens()) {
rv = val.SetMeetOrSlice(GetMeetOrSliceForString(tokenizer.nextToken()));
if (NS_FAILED(rv)) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
} else {
val.SetMeetOrSlice(nsIDOMSVGPreserveAspectRatio::SVG_MEETORSLICE_MEET);
}
if (tokenizer.hasMoreTokens()) {
return NS_ERROR_DOM_SYNTAX_ERR;
}
*aValue = val;
return NS_OK;
}