void
HTMLImageElement::PictureSourceSrcsetChanged(nsIContent *aSourceNode,
const nsAString& aNewValue,
bool aNotify)
{
bool isSelf = aSourceNode == this;
if (!IsSrcsetEnabled() ||
(!isSelf && !HTMLPictureElement::IsPictureEnabled())) {
return;
}
MOZ_ASSERT(isSelf || IsPreviousSibling(aSourceNode, this),
"Should not be getting notifications for non-previous-siblings");
nsIContent *currentSrc =
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
if (aSourceNode == currentSrc) {
// We're currently using this node as our responsive selector
// source.
mResponsiveSelector->SetCandidatesFromSourceSet(aNewValue);
}
// This always triggers the image update steps per the spec, even if
// we are not using this source.
QueueImageLoadTask();
}
void
HTMLImageElement::UpdateResponsiveSource()
{
if (!IsSrcsetEnabled()) {
mResponsiveSelector = nullptr;
return;
}
nsIContent *currentSource =
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
nsINode *parent = pictureEnabled ? this->nsINode::GetParentNode() : nullptr;
nsINode *candidateSource = nullptr;
if (parent && parent->Tag() == nsGkAtoms::picture) {
// Walk source nodes previous to ourselves
candidateSource = parent->GetFirstChild();
} else {
candidateSource = this;
}
while (candidateSource) {
if (candidateSource == currentSource) {
// found no better source before current, re-run selection on
// that and keep it if it's still usable.
mResponsiveSelector->SelectImage(true);
if (mResponsiveSelector->NumCandidates()) {
break;
}
// no longer valid
mResponsiveSelector = nullptr;
if (candidateSource == this) {
// No further possibilities
break;
}
} else if (candidateSource == this) {
// We are the last possible source
if (!TryCreateResponsiveSelector(candidateSource->AsContent())) {
// Failed to find any source
mResponsiveSelector = nullptr;
}
break;
} else if (candidateSource->Tag() == nsGkAtoms::source &&
TryCreateResponsiveSelector(candidateSource->AsContent())) {
// This led to a valid source, stop
break;
}
candidateSource = candidateSource->GetNextSibling();
}
if (!candidateSource) {
// Ran out of siblings without finding ourself, e.g. XBL magic.
mResponsiveSelector = nullptr;
}
}
bool
HTMLImageElement::HaveSrcsetOrInPicture()
{
if (IsSrcsetEnabled() && HasAttr(kNameSpaceID_None, nsGkAtoms::srcset)) {
return true;
}
if (!HTMLPictureElement::IsPictureEnabled()) {
return false;
}
Element *parent = nsINode::GetParentElement();
return (parent && parent->IsHTMLElement(nsGkAtoms::picture));
}
nsresult
HTMLImageElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAttrValue* aValue, bool aNotify)
{
if (aNameSpaceID == kNameSpaceID_None && mForm &&
(aName == nsGkAtoms::name || aName == nsGkAtoms::id) &&
aValue && !aValue->IsEmptyString()) {
// add the image to the hashtable as needed
NS_ABORT_IF_FALSE(aValue->Type() == nsAttrValue::eAtom,
"Expected atom value for name/id");
mForm->AddImageElementToTable(this,
nsDependentAtomString(aValue->GetAtomValue()));
}
// Handle src/srcset/crossorigin updates. If aNotify is false, we are coming
// from the parser or some such place; we'll get bound after all the
// attributes have been set, so we'll do the image load from BindToTree.
if (aName == nsGkAtoms::src &&
aNameSpaceID == kNameSpaceID_None) {
// SetAttr handles setting src in the non-responsive case, so only handle it
// for responsive mode or unsetting
if (!aValue) {
CancelImageRequests(aNotify);
} else if (mResponsiveSelector) {
mResponsiveSelector->SetDefaultSource(aValue ? aValue->GetStringValue()
: EmptyString());
LoadSelectedImage(false, aNotify);
}
} else if (aName == nsGkAtoms::srcset &&
aNameSpaceID == kNameSpaceID_None &&
aNotify &&
AsContent()->IsInDoc() &&
IsSrcsetEnabled()) {
// We currently don't handle responsive mode until BindToTree
UpdateSourceSet(aValue->GetStringValue());
LoadSelectedImage(false, aNotify);
} else if (aName == nsGkAtoms::crossorigin &&
aNameSpaceID == kNameSpaceID_None &&
aNotify) {
// We want aForce == true in this LoadImage call, because we want to force
// a new load of the image with the new cross origin policy.
nsCOMPtr<nsIURI> currentURI;
if (NS_SUCCEEDED(GetCurrentURI(getter_AddRefs(currentURI))) && currentURI) {
LoadImage(currentURI, true, aNotify);
}
}
return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName,
aValue, aNotify);
}
nsresult
HTMLImageElement::BindToTree(nsIDocument* aDocument, nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument, aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
nsImageLoadingContent::BindToTree(aDocument, aParent, aBindingParent,
aCompileEventHandlers);
if (aParent) {
UpdateFormOwner();
}
bool haveSrcset = IsSrcsetEnabled() &&
HasAttr(kNameSpaceID_None, nsGkAtoms::srcset);
if (haveSrcset || HasAttr(kNameSpaceID_None, nsGkAtoms::src)) {
// FIXME: Bug 660963 it would be nice if we could just have
// ClearBrokenState update our state and do it fast...
ClearBrokenState();
RemoveStatesSilently(NS_EVENT_STATE_BROKEN);
// We don't handle responsive changes when not bound to a tree, update them
// now if necessary
if (haveSrcset) {
nsAutoString srcset;
GetAttr(kNameSpaceID_None, nsGkAtoms::srcset, srcset);
UpdateSourceSet(srcset);
if (mResponsiveSelector) {
nsAutoString src;
GetAttr(kNameSpaceID_None, nsGkAtoms::src, src);
mResponsiveSelector->SetDefaultSource(src);
}
}
// If loading is temporarily disabled, don't even launch MaybeLoadImage.
// Otherwise MaybeLoadImage may run later when someone has reenabled
// loading.
if (LoadingEnabled()) {
nsContentUtils::AddScriptRunner(
NS_NewRunnableMethod(this, &HTMLImageElement::MaybeLoadImage));
}
}
return rv;
}
void
HTMLImageElement::UpdateSourceSet(const nsAString & aSrcset)
{
MOZ_ASSERT(IsSrcsetEnabled());
bool haveSrcset = !aSrcset.IsEmpty();
if (haveSrcset && !mResponsiveSelector) {
mResponsiveSelector = new ResponsiveImageSelector(this);
mResponsiveSelector->SetCandidatesFromSourceSet(aSrcset);
// src may have been set before we decided we were responsive
nsAutoString src;
if (GetAttr(kNameSpaceID_None, nsGkAtoms::src, src) && src.Length()) {
mResponsiveSelector->SetDefaultSource(src);
}
} else if (haveSrcset) {
mResponsiveSelector->SetCandidatesFromSourceSet(aSrcset);
} else if (mResponsiveSelector) {
// Clearing srcset, don't need responsive selector anymore
mResponsiveSelector = nullptr;
}
}
nsresult
HTMLImageElement::AfterSetAttr(int32_t aNameSpaceID, nsIAtom* aName,
const nsAttrValue* aValue, bool aNotify)
{
if (aNameSpaceID == kNameSpaceID_None && mForm &&
(aName == nsGkAtoms::name || aName == nsGkAtoms::id) &&
aValue && !aValue->IsEmptyString()) {
// add the image to the hashtable as needed
MOZ_ASSERT(aValue->Type() == nsAttrValue::eAtom,
"Expected atom value for name/id");
mForm->AddImageElementToTable(this,
nsDependentAtomString(aValue->GetAtomValue()));
}
// Handle src/srcset/crossorigin updates. If aNotify is false, we are coming
// from the parser or some such place; we'll get bound after all the
// attributes have been set, so we'll do the image load from BindToTree.
nsAttrValueOrString attrVal(aValue);
if (aName == nsGkAtoms::src &&
aNameSpaceID == kNameSpaceID_None &&
!aValue) {
// SetAttr handles setting src since it needs to catch img.src =
// img.src, so we only need to handle the unset case
if (InResponsiveMode()) {
if (mResponsiveSelector &&
mResponsiveSelector->Content() == this) {
mResponsiveSelector->SetDefaultSource(NullString());
}
QueueImageLoadTask(true);
} else {
// Bug 1076583 - We still behave synchronously in the non-responsive case
CancelImageRequests(aNotify);
}
} else if (aName == nsGkAtoms::srcset &&
aNameSpaceID == kNameSpaceID_None &&
IsSrcsetEnabled()) {
PictureSourceSrcsetChanged(this, attrVal.String(), aNotify);
} else if (aName == nsGkAtoms::sizes &&
aNameSpaceID == kNameSpaceID_None &&
HTMLPictureElement::IsPictureEnabled()) {
PictureSourceSizesChanged(this, attrVal.String(), aNotify);
} else if (aName == nsGkAtoms::crossorigin &&
aNameSpaceID == kNameSpaceID_None &&
aNotify) {
// Force a new load of the image with the new cross origin policy.
if (InResponsiveMode()) {
// per spec, full selection runs when this changes, even though
// it doesn't directly affect the source selection
QueueImageLoadTask(true);
} else {
// Bug 1076583 - We still use the older synchronous algorithm in
// non-responsive mode. Force a new load of the image with the
// new cross origin policy.
ForceReload(aNotify);
}
}
return nsGenericHTMLElement::AfterSetAttr(aNameSpaceID, aName,
aValue, aNotify);
}
/* static */ bool
HTMLImageElement::SelectSourceForTagWithAttrs(nsIDocument *aDocument,
bool aIsSourceTag,
const nsAString& aSrcAttr,
const nsAString& aSrcsetAttr,
const nsAString& aSizesAttr,
const nsAString& aTypeAttr,
const nsAString& aMediaAttr,
nsAString& aResult)
{
MOZ_ASSERT(aIsSourceTag || (aTypeAttr.IsEmpty() && aMediaAttr.IsEmpty()),
"Passing type or media attrs makes no sense without aIsSourceTag");
MOZ_ASSERT(!aIsSourceTag || aSrcAttr.IsEmpty(),
"Passing aSrcAttr makes no sense with aIsSourceTag set");
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
if (aIsSourceTag && !pictureEnabled) {
return false;
}
if (!IsSrcsetEnabled() || aSrcsetAttr.IsEmpty()) {
if (!aIsSourceTag) {
// For an <img> with no srcset, we would always select the src attr.
aResult.Assign(aSrcAttr);
return true;
}
// Otherwise, a <source> without srcset is never selected
return false;
}
// Would not consider source tags with unsupported media or type
if (aIsSourceTag &&
((!aMediaAttr.IsVoid() &&
!HTMLSourceElement::WouldMatchMediaForDocument(aMediaAttr, aDocument)) ||
(!aTypeAttr.IsVoid() &&
!SupportedPictureSourceType(aTypeAttr)))) {
return false;
}
// Using srcset or picture <source>, build a responsive selector for this tag.
RefPtr<ResponsiveImageSelector> sel =
new ResponsiveImageSelector(aDocument);
sel->SetCandidatesFromSourceSet(aSrcsetAttr);
if (pictureEnabled && !aSizesAttr.IsEmpty()) {
sel->SetSizesFromDescriptor(aSizesAttr);
}
if (!aIsSourceTag) {
sel->SetDefaultSource(aSrcAttr);
}
if (sel->GetSelectedImageURLSpec(aResult)) {
return true;
}
if (!aIsSourceTag) {
// <img> tag with no match would definitively load nothing.
aResult.Truncate();
return true;
}
// <source> tags with no match would leave source yet-undetermined.
return false;
}
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->IsHTMLElement(nsGkAtoms::source);
if (isSourceTag) {
if (!SourceElementMatches(aSourceNode)) {
return false;
}
} else if (aSourceNode->IsHTMLElement(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
RefPtr<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;
}
bool
HTMLImageElement::UpdateResponsiveSource()
{
bool hadSelector = !!mResponsiveSelector;
if (!IsSrcsetEnabled()) {
mResponsiveSelector = nullptr;
return hadSelector;
}
nsIContent *currentSource =
mResponsiveSelector ? mResponsiveSelector->Content() : nullptr;
bool pictureEnabled = HTMLPictureElement::IsPictureEnabled();
Element *parent = pictureEnabled ? nsINode::GetParentElement() : nullptr;
nsINode *candidateSource = nullptr;
if (parent && parent->IsHTMLElement(nsGkAtoms::picture)) {
// Walk source nodes previous to ourselves
candidateSource = parent->GetFirstChild();
} else {
candidateSource = this;
}
while (candidateSource) {
if (candidateSource == currentSource) {
// found no better source before current, re-run selection on
// that and keep it if it's still usable.
bool changed = mResponsiveSelector->SelectImage(true);
if (mResponsiveSelector->NumCandidates()) {
bool isUsableCandidate = true;
// an otherwise-usable source element may still have a media query that may not
// match any more.
if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
!SourceElementMatches(candidateSource->AsContent())) {
isUsableCandidate = false;
}
if (isUsableCandidate) {
return changed;
}
}
// no longer valid
mResponsiveSelector = nullptr;
if (candidateSource == this) {
// No further possibilities
break;
}
} else if (candidateSource == this) {
// We are the last possible source
if (!TryCreateResponsiveSelector(candidateSource->AsContent())) {
// Failed to find any source
mResponsiveSelector = nullptr;
}
break;
} else if (candidateSource->IsHTMLElement(nsGkAtoms::source) &&
TryCreateResponsiveSelector(candidateSource->AsContent())) {
// This led to a valid source, stop
break;
}
candidateSource = candidateSource->GetNextSibling();
}
if (!candidateSource) {
// Ran out of siblings without finding ourself, e.g. XBL magic.
mResponsiveSelector = nullptr;
}
return !hadSelector || mResponsiveSelector;
}
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;
}
