bool
HTMLImageElement::SourceElementMatches(nsIContent* aSourceNode)
{
MOZ_ASSERT(aSourceNode->IsHTMLElement(nsGkAtoms::source));
DebugOnly<Element *> parent(nsINode::GetParentElement());
MOZ_ASSERT(parent && parent->IsHTMLElement(nsGkAtoms::picture));
MOZ_ASSERT(IsPreviousSibling(aSourceNode, this));
// Check media and type
HTMLSourceElement *src = static_cast<HTMLSourceElement*>(aSourceNode);
if (!src->MatchesCurrentMedia()) {
return false;
}
nsAutoString type;
if (aSourceNode->GetAttr(kNameSpaceID_None, nsGkAtoms::type, type) &&
!SupportedPictureSourceType(type)) {
return false;
}
return true;
}
bool
HTMLImageElement::TryCreateResponsiveSelector(nsIContent *aSourceNode,
const nsAString *aSrcset,
const nsAString *aSizes)
{
if (!IsSrcsetEnabled()) {
return false;
}
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
// Skip if this is not a <source> with matching media query
bool isSourceTag = aSourceNode->Tag() == nsGkAtoms::source;
if (isSourceTag) {
DebugOnly<nsINode *> parent(nsINode::GetParentNode());
MOZ_ASSERT(parent && parent->Tag() == nsGkAtoms::picture);
MOZ_ASSERT(IsPreviousSibling(aSourceNode, this));
MOZ_ASSERT(pictureEnabled);
// Check media and type
HTMLSourceElement *src = static_cast<HTMLSourceElement*>(aSourceNode);
if (!src->MatchesCurrentMedia()) {
return false;
}
nsAutoString type;
if (aSourceNode->GetAttr(kNameSpaceID_None, nsGkAtoms::type, type) &&
!imgLoader::SupportImageWithMimeType(
NS_ConvertUTF16toUTF8(type).get(),
AcceptedMimeTypes::IMAGES_AND_DOCUMENTS)
) {
return false;
}
} else if (aSourceNode->Tag() == nsGkAtoms::img) {
// Otherwise this is the <img> tag itself
MOZ_ASSERT(aSourceNode == this);
}
// Skip if has no srcset or an empty srcset
nsString srcset;
if (aSrcset) {
srcset = *aSrcset;
} else if (!aSourceNode->GetAttr(kNameSpaceID_None, nsGkAtoms::srcset,
srcset)) {
return false;
}
if (srcset.IsEmpty()) {
return false;
}
// Try to parse
nsRefPtr<ResponsiveImageSelector> sel = new ResponsiveImageSelector(aSourceNode);
if (!sel->SetCandidatesFromSourceSet(srcset)) {
// No possible candidates, don't need to bother parsing sizes
return false;
}
if (pictureEnabled && aSizes) {
sel->SetSizesFromDescriptor(*aSizes);
} else if (pictureEnabled) {
nsAutoString sizes;
aSourceNode->GetAttr(kNameSpaceID_None, nsGkAtoms::sizes, sizes);
sel->SetSizesFromDescriptor(sizes);
}
// If this is the <img> tag, also pull in src as the default source
if (!isSourceTag) {
MOZ_ASSERT(aSourceNode == this);
nsAutoString src;
if (GetAttr(kNameSpaceID_None, nsGkAtoms::src, src) && !src.IsEmpty()) {
sel->SetDefaultSource(src);
}
}
mResponsiveSelector = sel;
return true;
}