1 files changed, 260 insertions, 0 deletions
diff --git a/accessible/generic/ImageAccessible.cpp b/accessible/generic/ImageAccessible.cpp
new file mode 100644
index 0000000000..df964e026c
--- /dev/null
+++ b/accessible/generic/ImageAccessible.cpp
@@ -0,0 +1,260 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ImageAccessible.h"
+
+#include "DocAccessible-inl.h"
+#include "LocalAccessible-inl.h"
+#include "nsAccUtils.h"
+#include "mozilla/a11y/Role.h"
+#include "AccAttributes.h"
+#include "AccIterator.h"
+#include "CacheConstants.h"
+#include "States.h"
+
+#include "imgIRequest.h"
+#include "nsGenericHTMLElement.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/MutationEventBinding.h"
+#include "nsContentUtils.h"
+#include "nsIImageLoadingContent.h"
+#include "nsPIDOMWindow.h"
+#include "nsIURI.h"
+
+namespace mozilla::a11y {
+
+NS_IMPL_ISUPPORTS_INHERITED(ImageAccessible, LinkableAccessible,
+                            imgINotificationObserver)
+
+////////////////////////////////////////////////////////////////////////////////
+// ImageAccessible
+////////////////////////////////////////////////////////////////////////////////
+
+ImageAccessible::ImageAccessible(nsIContent* aContent, DocAccessible* aDoc)
+    : LinkableAccessible(aContent, aDoc),
+      mImageRequestStatus(imgIRequest::STATUS_NONE) {
+  mType = eImageType;
+  nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent));
+  if (content) {
+    content->AddNativeObserver(this);
+    nsCOMPtr<imgIRequest> imageRequest;
+    content->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
+                        getter_AddRefs(imageRequest));
+    if (imageRequest) {
+      imageRequest->GetImageStatus(&mImageRequestStatus);
+    }
+  }
+}
+
+ImageAccessible::~ImageAccessible() {}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible public
+
+void ImageAccessible::Shutdown() {
+  nsCOMPtr<nsIImageLoadingContent> content(do_QueryInterface(mContent));
+  if (content) {
+    content->RemoveNativeObserver(this);
+  }
+
+  LinkableAccessible::Shutdown();
+}
+
+uint64_t ImageAccessible::NativeState() const {
+  // The state is a bitfield, get our inherited state, then logically OR it with
+  // states::ANIMATED if this is an animated image.
+
+  uint64_t state = LinkableAccessible::NativeState();
+
+  if (mImageRequestStatus & imgIRequest::STATUS_IS_ANIMATED) {
+    state |= states::ANIMATED;
+  }
+
+  if (!(mImageRequestStatus & imgIRequest::STATUS_SIZE_AVAILABLE)) {
+    nsIFrame* frame = GetFrame();
+    MOZ_ASSERT(!frame || frame->AccessibleType() == eImageType ||
+               frame->AccessibleType() == a11y::eHTMLImageMapType);
+    if (frame && !frame->HasAnyStateBits(IMAGE_SIZECONSTRAINED)) {
+      // The size of this image hasn't been constrained and we haven't loaded
+      // enough of the image to know its size yet. This means it currently
+      // has 0 width and height.
+      state |= states::INVISIBLE;
+    }
+  }
+
+  return state;
+}
+
+ENameValueFlag ImageAccessible::NativeName(nsString& aName) const {
+  mContent->AsElement()->GetAttr(nsGkAtoms::alt, aName);
+  if (!aName.IsEmpty()) return eNameOK;
+
+  ENameValueFlag nameFlag = LocalAccessible::NativeName(aName);
+  if (!aName.IsEmpty()) return nameFlag;
+
+  return eNameOK;
+}
+
+role ImageAccessible::NativeRole() const { return roles::GRAPHIC; }
+
+void ImageAccessible::DOMAttributeChanged(int32_t aNameSpaceID,
+                                          nsAtom* aAttribute, int32_t aModType,
+                                          const nsAttrValue* aOldValue,
+                                          uint64_t aOldState) {
+  LinkableAccessible::DOMAttributeChanged(aNameSpaceID, aAttribute, aModType,
+                                          aOldValue, aOldState);
+
+  if (aAttribute == nsGkAtoms::longdesc &&
+      (aModType == dom::MutationEvent_Binding::ADDITION ||
+       aModType == dom::MutationEvent_Binding::REMOVAL)) {
+    mDoc->QueueCacheUpdate(this, CacheDomain::Actions);
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// LocalAccessible
+
+uint8_t ImageAccessible::ActionCount() const {
+  uint8_t actionCount = LinkableAccessible::ActionCount();
+  return HasLongDesc() ? actionCount + 1 : actionCount;
+}
+
+void ImageAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
+  aName.Truncate();
+  if (IsLongDescIndex(aIndex) && HasLongDesc()) {
+    aName.AssignLiteral("showlongdesc");
+  } else {
+    LinkableAccessible::ActionNameAt(aIndex, aName);
+  }
+}
+
+bool ImageAccessible::DoAction(uint8_t aIndex) const {
+  // Get the long description uri and open in a new window.
+  if (!IsLongDescIndex(aIndex)) return LinkableAccessible::DoAction(aIndex);
+
+  nsCOMPtr<nsIURI> uri = GetLongDescURI();
+  if (!uri) return false;
+
+  nsAutoCString utf8spec;
+  uri->GetSpec(utf8spec);
+  NS_ConvertUTF8toUTF16 spec(utf8spec);
+
+  dom::Document* document = mContent->OwnerDoc();
+  nsCOMPtr<nsPIDOMWindowOuter> piWindow = document->GetWindow();
+  if (!piWindow) return false;
+
+  RefPtr<dom::BrowsingContext> tmp;
+  return NS_SUCCEEDED(piWindow->Open(spec, u""_ns, u""_ns,
+                                     /* aLoadInfo = */ nullptr,
+                                     /* aForceNoOpener = */ false,
+                                     getter_AddRefs(tmp)));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// ImageAccessible
+
+LayoutDeviceIntPoint ImageAccessible::Position(uint32_t aCoordType) {
+  LayoutDeviceIntPoint point = Bounds().TopLeft();
+  nsAccUtils::ConvertScreenCoordsTo(&point.x.value, &point.y.value, aCoordType,
+                                    this);
+  return point;
+}
+
+LayoutDeviceIntSize ImageAccessible::Size() { return Bounds().Size(); }
+
+// LocalAccessible
+already_AddRefed<AccAttributes> ImageAccessible::NativeAttributes() {
+  RefPtr<AccAttributes> attributes = LinkableAccessible::NativeAttributes();
+
+  nsString src;
+  mContent->AsElement()->GetAttr(nsGkAtoms::src, src);
+  if (!src.IsEmpty()) attributes->SetAttribute(nsGkAtoms::src, std::move(src));
+
+  return attributes.forget();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Private methods
+
+already_AddRefed<nsIURI> ImageAccessible::GetLongDescURI() const {
+  if (mContent->AsElement()->HasAttr(nsGkAtoms::longdesc)) {
+    // To check if longdesc contains an invalid url.
+    nsAutoString longdesc;
+    mContent->AsElement()->GetAttr(nsGkAtoms::longdesc, longdesc);
+    if (longdesc.FindChar(' ') != -1 || longdesc.FindChar('\t') != -1 ||
+        longdesc.FindChar('\r') != -1 || longdesc.FindChar('\n') != -1) {
+      return nullptr;
+    }
+    nsCOMPtr<nsIURI> uri;
+    nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri), longdesc,
+                                              mContent->OwnerDoc(),
+                                              mContent->GetBaseURI());
+    return uri.forget();
+  }
+
+  DocAccessible* document = Document();
+  if (document) {
+    IDRefsIterator iter(document, mContent, nsGkAtoms::aria_describedby);
+    while (nsIContent* target = iter.NextElem()) {
+      if ((target->IsHTMLElement(nsGkAtoms::a) ||
+           target->IsHTMLElement(nsGkAtoms::area)) &&
+          target->AsElement()->HasAttr(nsGkAtoms::href)) {
+        nsGenericHTMLElement* element = nsGenericHTMLElement::FromNode(target);
+
+        nsCOMPtr<nsIURI> uri;
+        element->GetURIAttr(nsGkAtoms::href, nullptr, getter_AddRefs(uri));
+        return uri.forget();
+      }
+    }
+  }
+
+  return nullptr;
+}
+
+bool ImageAccessible::IsLongDescIndex(uint8_t aIndex) const {
+  return aIndex == LinkableAccessible::ActionCount();
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// imgINotificationObserver
+
+void ImageAccessible::Notify(imgIRequest* aRequest, int32_t aType,
+                             const nsIntRect* aData) {
+  if (aType != imgINotificationObserver::FRAME_COMPLETE &&
+      aType != imgINotificationObserver::LOAD_COMPLETE &&
+      aType != imgINotificationObserver::DECODE_COMPLETE) {
+    // We should update our state if the whole image was decoded,
+    // or the first frame in the case of a gif.
+    return;
+  }
+
+  if (IsDefunct() || !mParent) {
+    return;
+  }
+
+  uint32_t status = imgIRequest::STATUS_NONE;
+  aRequest->GetImageStatus(&status);
+
+  if ((status ^ mImageRequestStatus) & imgIRequest::STATUS_SIZE_AVAILABLE) {
+    nsIFrame* frame = GetFrame();
+    if (frame && !frame->HasAnyStateBits(IMAGE_SIZECONSTRAINED)) {
+      RefPtr<AccEvent> event = new AccStateChangeEvent(
+          this, states::INVISIBLE,
+          !(status & imgIRequest::STATUS_SIZE_AVAILABLE));
+      mDoc->FireDelayedEvent(event);
+    }
+  }
+
+  if ((status ^ mImageRequestStatus) & imgIRequest::STATUS_IS_ANIMATED) {
+    RefPtr<AccEvent> event = new AccStateChangeEvent(
+        this, states::ANIMATED, (status & imgIRequest::STATUS_IS_ANIMATED));
+    mDoc->FireDelayedEvent(event);
+  }
+
+  mImageRequestStatus = status;
+}
+
+}  // namespace mozilla::a11y