The Tor Browser: layout/xul/nsImageBoxFrame.cpp@925c144e1f1f (annotated)

layout/xul/nsImageBoxFrame.cpp@925c144e1f1f (annotated)

layout/xul/nsImageBoxFrame.cpp

Fri, 16 Jan 2015 18:13:44 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 18:13:44 +0100
branch: TOR_BUG_9701
changeset 14: 925c144e1f1f
permissions: -rw-r--r--

Integrate suggestion from review to improve consistency with existing code.

 /* -*- 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/. */
 //
 // Eric Vaughan
 // Netscape Communications
 //
 // See documentation in associated header file
 //
 #include "nsImageBoxFrame.h"
 #include "nsGkAtoms.h"
 #include "nsStyleContext.h"
 #include "nsStyleConsts.h"
 #include "nsCOMPtr.h"
 #include "nsPresContext.h"
 #include "nsBoxLayoutState.h"
 #include "nsHTMLParts.h"
 #include "nsString.h"
 #include "nsLeafFrame.h"
 #include "nsIPresShell.h"
 #include "nsIDocument.h"
 #include "nsImageMap.h"
 #include "nsILinkHandler.h"
 #include "nsIURL.h"
 #include "nsILoadGroup.h"
 #include "nsContainerFrame.h"
 #include "prprf.h"
 #include "nsCSSRendering.h"
 #include "nsIDOMHTMLImageElement.h"
 #include "nsNameSpaceManager.h"
 #include "nsTextFragment.h"
 #include "nsIDOMHTMLMapElement.h"
 #include "nsTransform2D.h"
 #include "nsITheme.h"
 #include "nsIServiceManager.h"
 #include "nsIURI.h"
 #include "nsNetUtil.h"
 #include "nsThreadUtils.h"
 #include "nsDisplayList.h"
 #include "ImageLayers.h"
 #include "ImageContainer.h"
 #include "nsContentUtils.h"
 #include "mozilla/BasicEvents.h"
 #include "mozilla/EventDispatcher.h"
 #define ONLOAD_CALLED_TOO_EARLY 1
 using namespace mozilla;
 using namespace mozilla::layers;
 class nsImageBoxFrameEvent : public nsRunnable
 {
 public:
   nsImageBoxFrameEvent(nsIContent *content, uint32_t message)
     : mContent(content), mMessage(message) {}
   NS_IMETHOD Run() MOZ_OVERRIDE;
 private:
   nsCOMPtr<nsIContent> mContent;
   uint32_t mMessage;
 };
 NS_IMETHODIMP
 nsImageBoxFrameEvent::Run()
 {
   nsIPresShell *pres_shell = mContent->OwnerDoc()->GetShell();
   if (!pres_shell) {
     return NS_OK;
   }
   nsRefPtr<nsPresContext> pres_context = pres_shell->GetPresContext();
   if (!pres_context) {
     return NS_OK;
   }
   nsEventStatus status = nsEventStatus_eIgnore;
   WidgetEvent event(true, mMessage);
   event.mFlags.mBubbles = false;
   EventDispatcher::Dispatch(mContent, pres_context, &event, nullptr, &status);
   return NS_OK;
 }
 // Fire off an event that'll asynchronously call the image elements
 // onload handler once handled. This is needed since the image library
 // can't decide if it wants to call it's observer methods
 // synchronously or asynchronously. If an image is loaded from the
 // cache the notifications come back synchronously, but if the image
 // is loaded from the netswork the notifications come back
 // asynchronously.
 void
 FireImageDOMEvent(nsIContent* aContent, uint32_t aMessage)
 {
   NS_ASSERTION(aMessage == NS_LOAD || aMessage == NS_LOAD_ERROR,
                "invalid message");
   nsCOMPtr<nsIRunnable> event = new nsImageBoxFrameEvent(aContent, aMessage);
   if (NS_FAILED(NS_DispatchToCurrentThread(event)))
     NS_WARNING("failed to dispatch image event");
 }
 //
 // NS_NewImageBoxFrame
 //
 // Creates a new image frame and returns it
 //
 nsIFrame*
 NS_NewImageBoxFrame (nsIPresShell* aPresShell, nsStyleContext* aContext)
 {
   return new (aPresShell) nsImageBoxFrame (aPresShell, aContext);
 }
 NS_IMPL_FRAMEARENA_HELPERS(nsImageBoxFrame)
 nsresult
 nsImageBoxFrame::AttributeChanged(int32_t aNameSpaceID,
                                   nsIAtom* aAttribute,
                                   int32_t aModType)
 {
   nsresult rv = nsLeafBoxFrame::AttributeChanged(aNameSpaceID, aAttribute,
                                                  aModType);
   if (aAttribute == nsGkAtoms::src) {
     UpdateImage();
     PresContext()->PresShell()->
       FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
   }
   else if (aAttribute == nsGkAtoms::validate)
     UpdateLoadFlags();
   return rv;
 }
 nsImageBoxFrame::nsImageBoxFrame(nsIPresShell* aShell, nsStyleContext* aContext):
   nsLeafBoxFrame(aShell, aContext),
   mIntrinsicSize(0,0),
   mRequestRegistered(false),
   mLoadFlags(nsIRequest::LOAD_NORMAL),
   mUseSrcAttr(false),
   mSuppressStyleCheck(false),
   mFireEventOnDecode(false)
 {
   MarkIntrinsicWidthsDirty();
 }
 nsImageBoxFrame::~nsImageBoxFrame()
 {
 }
 /* virtual */ void
 nsImageBoxFrame::MarkIntrinsicWidthsDirty()
 {
   SizeNeedsRecalc(mImageSize);
   nsLeafBoxFrame::MarkIntrinsicWidthsDirty();
 }
 void
 nsImageBoxFrame::DestroyFrom(nsIFrame* aDestructRoot)
 {
   if (mImageRequest) {
     nsLayoutUtils::DeregisterImageRequest(PresContext(), mImageRequest,
                                           &mRequestRegistered);
     // Release image loader first so that it's refcnt can go to zero
     mImageRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
   }
   if (mListener)
     reinterpret_cast<nsImageBoxListener*>(mListener.get())->SetFrame(nullptr); // set the frame to null so we don't send messages to a dead object.
   nsLeafBoxFrame::DestroyFrom(aDestructRoot);
 }
 void
 nsImageBoxFrame::Init(nsIContent*      aContent,
                       nsIFrame*        aParent,
                       nsIFrame*        aPrevInFlow)
 {
   if (!mListener) {
     nsImageBoxListener *listener = new nsImageBoxListener();
     NS_ADDREF(listener);
     listener->SetFrame(this);
     listener->QueryInterface(NS_GET_IID(imgINotificationObserver), getter_AddRefs(mListener));
     NS_RELEASE(listener);
   }
   mSuppressStyleCheck = true;
   nsLeafBoxFrame::Init(aContent, aParent, aPrevInFlow);
   mSuppressStyleCheck = false;
   UpdateLoadFlags();
   UpdateImage();
 }
 void
 nsImageBoxFrame::UpdateImage()
 {
   nsPresContext* presContext = PresContext();
   if (mImageRequest) {
     nsLayoutUtils::DeregisterImageRequest(presContext, mImageRequest,
                                           &mRequestRegistered);
     mImageRequest->CancelAndForgetObserver(NS_ERROR_FAILURE);
     mImageRequest = nullptr;
   }
   // get the new image src
   nsAutoString src;
   mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::src, src);
   mUseSrcAttr = !src.IsEmpty();
   if (mUseSrcAttr) {
     nsIDocument* doc = mContent->GetDocument();
     if (!doc) {
       // No need to do anything here...
       return;
     }
     nsCOMPtr<nsIURI> baseURI = mContent->GetBaseURI();
     nsCOMPtr<nsIURI> uri;
     nsContentUtils::NewURIWithDocumentCharset(getter_AddRefs(uri),
                                               src,
                                               doc,
                                               baseURI);
     if (uri && nsContentUtils::CanLoadImage(uri, mContent, doc,
                                             mContent->NodePrincipal())) {
       nsContentUtils::LoadImage(uri, doc, mContent->NodePrincipal(),
                                 doc->GetDocumentURI(), mListener, mLoadFlags,
                                 EmptyString(), getter_AddRefs(mImageRequest));
       if (mImageRequest) {
         nsLayoutUtils::RegisterImageRequestIfAnimated(presContext,
                                                       mImageRequest,
                                                       &mRequestRegistered);
       }
     }
   } else {
     // Only get the list-style-image if we aren't being drawn
     // by a native theme.
     uint8_t appearance = StyleDisplay()->mAppearance;
     if (!(appearance && nsBox::gTheme &&
           nsBox::gTheme->ThemeSupportsWidget(nullptr, this, appearance))) {
       // get the list-style-image
       imgRequestProxy *styleRequest = StyleList()->GetListStyleImage();
       if (styleRequest) {
         styleRequest->Clone(mListener, getter_AddRefs(mImageRequest));
       }
     }
   }
   if (!mImageRequest) {
     // We have no image, so size to 0
     mIntrinsicSize.SizeTo(0, 0);
   } else {
     // We don't want discarding or decode-on-draw for xul images.
     mImageRequest->StartDecoding();
     mImageRequest->LockImage();
   }
 }
 void
 nsImageBoxFrame::UpdateLoadFlags()
 {
   static nsIContent::AttrValuesArray strings[] =
     {&nsGkAtoms::always, &nsGkAtoms::never, nullptr};
   switch (mContent->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::validate,
                                     strings, eCaseMatters)) {
     case 0:
       mLoadFlags = nsIRequest::VALIDATE_ALWAYS;
       break;
     case 1:
       mLoadFlags = nsIRequest::VALIDATE_NEVER|nsIRequest::LOAD_FROM_CACHE;
       break;
     default:
       mLoadFlags = nsIRequest::LOAD_NORMAL;
       break;
   }
 }
 void
 nsImageBoxFrame::BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                   const nsRect&           aDirtyRect,
                                   const nsDisplayListSet& aLists)
 {
   nsLeafBoxFrame::BuildDisplayList(aBuilder, aDirtyRect, aLists);
   if ((0 == mRect.width) || (0 == mRect.height)) {
     // Do not render when given a zero area. This avoids some useless
     // scaling work while we wait for our image dimensions to arrive
     // asynchronously.
     return;
   }
   if (!IsVisibleForPainting(aBuilder))
     return;
   nsDisplayList list;
   list.AppendNewToTop(
     new (aBuilder) nsDisplayXULImage(aBuilder, this));
   CreateOwnLayerIfNeeded(aBuilder, &list);
   aLists.Content()->AppendToTop(&list);
 }
 void
 nsImageBoxFrame::PaintImage(nsRenderingContext& aRenderingContext,
                             const nsRect& aDirtyRect, nsPoint aPt,
                             uint32_t aFlags)
 {
   nsRect rect;
   GetClientRect(rect);
   rect += aPt;
   if (!mImageRequest)
     return;
   // don't draw if the image is not dirty
   nsRect dirty;
   if (!dirty.IntersectRect(aDirtyRect, rect))
     return;
   nsCOMPtr<imgIContainer> imgCon;
   mImageRequest->GetImage(getter_AddRefs(imgCon));
   if (imgCon) {
     bool hasSubRect = !mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0);
     nsLayoutUtils::DrawSingleImage(&aRenderingContext, imgCon,
         nsLayoutUtils::GetGraphicsFilterForFrame(this),
         rect, dirty, nullptr, aFlags, hasSubRect ? &mSubRect : nullptr);
   }
 }
 void nsDisplayXULImage::Paint(nsDisplayListBuilder* aBuilder,
                               nsRenderingContext* aCtx)
 {
   uint32_t flags = imgIContainer::FLAG_NONE;
   if (aBuilder->ShouldSyncDecodeImages())
     flags |= imgIContainer::FLAG_SYNC_DECODE;
   if (aBuilder->IsPaintingToWindow())
     flags |= imgIContainer::FLAG_HIGH_QUALITY_SCALING;
   static_cast<nsImageBoxFrame*>(mFrame)->
     PaintImage(*aCtx, mVisibleRect, ToReferenceFrame(), flags);
 }
 void
 nsDisplayXULImage::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
                                              const nsDisplayItemGeometry* aGeometry,
                                              nsRegion* aInvalidRegion)
 {
   if (aBuilder->ShouldSyncDecodeImages()) {
     nsImageBoxFrame* boxFrame = static_cast<nsImageBoxFrame*>(mFrame);
     nsCOMPtr<imgIContainer> image;
     if (boxFrame->mImageRequest) {
       boxFrame->mImageRequest->GetImage(getter_AddRefs(image));
     }
     if  (image && !image->IsDecoded()) {
       bool snap;
       aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
     }
   }
   nsDisplayImageContainer::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
 }
 void
 nsDisplayXULImage::ConfigureLayer(ImageLayer* aLayer, const nsIntPoint& aOffset)
 {
   aLayer->SetFilter(nsLayoutUtils::GetGraphicsFilterForFrame(mFrame));
   int32_t factor = mFrame->PresContext()->AppUnitsPerDevPixel();
   nsImageBoxFrame* imageFrame = static_cast<nsImageBoxFrame*>(mFrame);
   nsRect dest;
   imageFrame->GetClientRect(dest);
   dest += ToReferenceFrame();
   gfxRect destRect(dest.x, dest.y, dest.width, dest.height);
   destRect.ScaleInverse(factor);
   nsCOMPtr<imgIContainer> imgCon;
   imageFrame->mImageRequest->GetImage(getter_AddRefs(imgCon));
   int32_t imageWidth;
   int32_t imageHeight;
   imgCon->GetWidth(&imageWidth);
   imgCon->GetHeight(&imageHeight);
   NS_ASSERTION(imageWidth != 0 && imageHeight != 0, "Invalid image size!");
   gfxPoint p = destRect.TopLeft() + aOffset;
   gfx::Matrix transform;
   transform.Translate(p.x, p.y);
   transform.Scale(destRect.Width()/imageWidth,
                   destRect.Height()/imageHeight);
   aLayer->SetBaseTransform(gfx::Matrix4x4::From2D(transform));
   aLayer->SetVisibleRegion(nsIntRect(0, 0, imageWidth, imageHeight));
 }
 already_AddRefed<ImageContainer>
 nsDisplayXULImage::GetContainer(LayerManager* aManager, nsDisplayListBuilder* aBuilder)
 {
   return static_cast<nsImageBoxFrame*>(mFrame)->GetContainer(aManager);
 }
 already_AddRefed<ImageContainer>
 nsImageBoxFrame::GetContainer(LayerManager* aManager)
 {
   bool hasSubRect = !mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0);
   if (hasSubRect || !mImageRequest) {
     return nullptr;
   }
   nsCOMPtr<imgIContainer> imgCon;
   mImageRequest->GetImage(getter_AddRefs(imgCon));
   if (!imgCon) {
     return nullptr;
   }
   nsRefPtr<ImageContainer> container;
   nsresult rv = imgCon->GetImageContainer(aManager, getter_AddRefs(container));
   NS_ENSURE_SUCCESS(rv, nullptr);
   return container.forget();
 }
 //
 // DidSetStyleContext
 //
 // When the style context changes, make sure that all of our image is up to date.
 //
 /* virtual */ void
 nsImageBoxFrame::DidSetStyleContext(nsStyleContext* aOldStyleContext)
 {
   nsLeafBoxFrame::DidSetStyleContext(aOldStyleContext);
   // Fetch our subrect.
   const nsStyleList* myList = StyleList();
   mSubRect = myList->mImageRegion; // before |mSuppressStyleCheck| test!
   if (mUseSrcAttr || mSuppressStyleCheck)
     return; // No more work required, since the image isn't specified by style.
   // If we're using a native theme implementation, we shouldn't draw anything.
   const nsStyleDisplay* disp = StyleDisplay();
   if (disp->mAppearance && nsBox::gTheme &&
       nsBox::gTheme->ThemeSupportsWidget(nullptr, this, disp->mAppearance))
     return;
   // If list-style-image changes, we have a new image.
   nsCOMPtr<nsIURI> oldURI, newURI;
   if (mImageRequest)
     mImageRequest->GetURI(getter_AddRefs(oldURI));
   if (myList->GetListStyleImage())
     myList->GetListStyleImage()->GetURI(getter_AddRefs(newURI));
   bool equal;
   if (newURI == oldURI ||   // handles null==null
       (newURI && oldURI &&
        NS_SUCCEEDED(newURI->Equals(oldURI, &equal)) && equal))
     return;
   UpdateImage();
 } // DidSetStyleContext
 void
 nsImageBoxFrame::GetImageSize()
 {
   if (mIntrinsicSize.width > 0 && mIntrinsicSize.height > 0) {
     mImageSize.width = mIntrinsicSize.width;
     mImageSize.height = mIntrinsicSize.height;
   } else {
     mImageSize.width = 0;
     mImageSize.height = 0;
   }
 }
 /**
  * Ok return our dimensions
  */
 nsSize
 nsImageBoxFrame::GetPrefSize(nsBoxLayoutState& aState)
 {
   nsSize size(0,0);
   DISPLAY_PREF_SIZE(this, size);
   if (DoesNeedRecalc(mImageSize))
      GetImageSize();
   if (!mUseSrcAttr && (mSubRect.width > 0 || mSubRect.height > 0))
     size = mSubRect.Size();
   else
     size = mImageSize;
   nsSize intrinsicSize = size;
   nsMargin borderPadding(0,0,0,0);
   GetBorderAndPadding(borderPadding);
   size.width += borderPadding.LeftRight();
   size.height += borderPadding.TopBottom();
   bool widthSet, heightSet;
   nsIFrame::AddCSSPrefSize(this, size, widthSet, heightSet);
   NS_ASSERTION(size.width != NS_INTRINSICSIZE && size.height != NS_INTRINSICSIZE,
                "non-intrinsic size expected");
   nsSize minSize = GetMinSize(aState);
   nsSize maxSize = GetMaxSize(aState);
   if (!widthSet && !heightSet) {
     if (minSize.width != NS_INTRINSICSIZE)
       minSize.width -= borderPadding.LeftRight();
     if (minSize.height != NS_INTRINSICSIZE)
       minSize.height -= borderPadding.TopBottom();
     if (maxSize.width != NS_INTRINSICSIZE)
       maxSize.width -= borderPadding.LeftRight();
     if (maxSize.height != NS_INTRINSICSIZE)
       maxSize.height -= borderPadding.TopBottom();
     size = nsLayoutUtils::ComputeAutoSizeWithIntrinsicDimensions(minSize.width, minSize.height,
                                                                  maxSize.width, maxSize.height,
                                                                  intrinsicSize.width, intrinsicSize.height);
     NS_ASSERTION(size.width != NS_INTRINSICSIZE && size.height != NS_INTRINSICSIZE,
                  "non-intrinsic size expected");
     size.width += borderPadding.LeftRight();
     size.height += borderPadding.TopBottom();
     return size;
   }
   if (!widthSet) {
     if (intrinsicSize.height > 0) {
       // Subtract off the border and padding from the height because the
       // content-box needs to be used to determine the ratio
       nscoord height = size.height - borderPadding.TopBottom();
       size.width = nscoord(int64_t(height) * int64_t(intrinsicSize.width) /
                            int64_t(intrinsicSize.height));
     }
     else {
       size.width = intrinsicSize.width;
     }
     size.width += borderPadding.LeftRight();
   }
   else if (!heightSet) {
     if (intrinsicSize.width > 0) {
       nscoord width = size.width - borderPadding.LeftRight();
       size.height = nscoord(int64_t(width) * int64_t(intrinsicSize.height) /
                             int64_t(intrinsicSize.width));
     }
     else {
       size.height = intrinsicSize.height;
     }
     size.height += borderPadding.TopBottom();
   }
   return BoundsCheck(minSize, size, maxSize);
 }
 nsSize
 nsImageBoxFrame::GetMinSize(nsBoxLayoutState& aState)
 {
   // An image can always scale down to (0,0).
   nsSize size(0,0);
   DISPLAY_MIN_SIZE(this, size);
   AddBorderAndPadding(size);
   bool widthSet, heightSet;
   nsIFrame::AddCSSMinSize(aState, this, size, widthSet, heightSet);
   return size;
 }
 nscoord
 nsImageBoxFrame::GetBoxAscent(nsBoxLayoutState& aState)
 {
   return GetPrefSize(aState).height;
 }
 nsIAtom*
 nsImageBoxFrame::GetType() const
 {
   return nsGkAtoms::imageBoxFrame;
 }
 #ifdef DEBUG_FRAME_DUMP
 nsresult
 nsImageBoxFrame::GetFrameName(nsAString& aResult) const
 {
   return MakeFrameName(NS_LITERAL_STRING("ImageBox"), aResult);
 }
 #endif
 nsresult
 nsImageBoxFrame::Notify(imgIRequest *aRequest, int32_t aType, const nsIntRect* aData)
 {
   if (aType == imgINotificationObserver::SIZE_AVAILABLE) {
     nsCOMPtr<imgIContainer> image;
     aRequest->GetImage(getter_AddRefs(image));
     return OnStartContainer(aRequest, image);
   }
   if (aType == imgINotificationObserver::DECODE_COMPLETE) {
     return OnStopDecode(aRequest);
   }
   if (aType == imgINotificationObserver::LOAD_COMPLETE) {
     uint32_t imgStatus;
     aRequest->GetImageStatus(&imgStatus);
     nsresult status =
         imgStatus & imgIRequest::STATUS_ERROR ? NS_ERROR_FAILURE : NS_OK;
     return OnStopRequest(aRequest, status);
   }
   if (aType == imgINotificationObserver::IS_ANIMATED) {
     return OnImageIsAnimated(aRequest);
   }
   if (aType == imgINotificationObserver::FRAME_UPDATE) {
     return FrameChanged(aRequest);
   }
   return NS_OK;
 }
 nsresult nsImageBoxFrame::OnStartContainer(imgIRequest *request,
                                            imgIContainer *image)
 {
   NS_ENSURE_ARG_POINTER(image);
   // Ensure the animation (if any) is started. Note: There is no
   // corresponding call to Decrement for this. This Increment will be
   // 'cleaned up' by the Request when it is destroyed, but only then.
   request->IncrementAnimationConsumers();
   nscoord w, h;
   image->GetWidth(&w);
   image->GetHeight(&h);
   mIntrinsicSize.SizeTo(nsPresContext::CSSPixelsToAppUnits(w),
                         nsPresContext::CSSPixelsToAppUnits(h));
   if (!(GetStateBits() & NS_FRAME_FIRST_REFLOW)) {
     PresContext()->PresShell()->
       FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
   }
   return NS_OK;
 }
 nsresult nsImageBoxFrame::OnStopDecode(imgIRequest *request)
 {
   if (mFireEventOnDecode) {
     mFireEventOnDecode = false;
     uint32_t reqStatus;
     request->GetImageStatus(&reqStatus);
     if (!(reqStatus & imgIRequest::STATUS_ERROR)) {
       FireImageDOMEvent(mContent, NS_LOAD);
     } else {
       // Fire an onerror DOM event.
       mIntrinsicSize.SizeTo(0, 0);
       PresContext()->PresShell()->
         FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
       FireImageDOMEvent(mContent, NS_LOAD_ERROR);
     }
   }
   nsBoxLayoutState state(PresContext());
   this->Redraw(state);
   return NS_OK;
 }
 nsresult nsImageBoxFrame::OnStopRequest(imgIRequest *request,
                                         nsresult aStatus)
 {
   uint32_t reqStatus;
   request->GetImageStatus(&reqStatus);
   // We want to give the decoder a chance to find errors. If we haven't found
   // an error yet and we've already started decoding, we must only fire these
   // events after we finish decoding.
   if (NS_SUCCEEDED(aStatus) && !(reqStatus & imgIRequest::STATUS_ERROR) &&
       reqStatus & imgIRequest::STATUS_DECODE_STARTED) {
     mFireEventOnDecode = true;
   } else {
     if (NS_SUCCEEDED(aStatus)) {
       // Fire an onload DOM event.
       FireImageDOMEvent(mContent, NS_LOAD);
     } else {
       // Fire an onerror DOM event.
       mIntrinsicSize.SizeTo(0, 0);
       PresContext()->PresShell()->
         FrameNeedsReflow(this, nsIPresShell::eStyleChange, NS_FRAME_IS_DIRTY);
       FireImageDOMEvent(mContent, NS_LOAD_ERROR);
     }
   }
   return NS_OK;
 }
 nsresult nsImageBoxFrame::OnImageIsAnimated(imgIRequest *aRequest)
 {
   // Register with our refresh driver, if we're animated.
   nsLayoutUtils::RegisterImageRequest(PresContext(), aRequest,
                                       &mRequestRegistered);
   return NS_OK;
 }
 nsresult nsImageBoxFrame::FrameChanged(imgIRequest *aRequest)
 {
   if ((0 == mRect.width) || (0 == mRect.height)) {
     return NS_OK;
   }
   InvalidateLayer(nsDisplayItem::TYPE_XUL_IMAGE);
   return NS_OK;
 }
 NS_IMPL_ISUPPORTS(nsImageBoxListener, imgINotificationObserver, imgIOnloadBlocker)
 nsImageBoxListener::nsImageBoxListener()
 {
 }
 nsImageBoxListener::~nsImageBoxListener()
 {
 }
 NS_IMETHODIMP
 nsImageBoxListener::Notify(imgIRequest *request, int32_t aType, const nsIntRect* aData)
 {
   if (!mFrame)
     return NS_OK;
   return mFrame->Notify(request, aType, aData);
 }
 /* void blockOnload (in imgIRequest aRequest); */
 NS_IMETHODIMP
 nsImageBoxListener::BlockOnload(imgIRequest *aRequest)
 {
   if (mFrame && mFrame->GetContent() && mFrame->GetContent()->GetCurrentDoc()) {
     mFrame->GetContent()->GetCurrentDoc()->BlockOnload();
   }
   return NS_OK;
 }
 /* void unblockOnload (in imgIRequest aRequest); */
 NS_IMETHODIMP
 nsImageBoxListener::UnblockOnload(imgIRequest *aRequest)
 {
   if (mFrame && mFrame->GetContent() && mFrame->GetContent()->GetCurrentDoc()) {
     mFrame->GetContent()->GetCurrentDoc()->UnblockOnload(false);
   }
   return NS_OK;
 }

The Tor Browser / annotate

layout/xul/nsImageBoxFrame.cpp@925c144e1f1f (annotated)

layout/xul/nsImageBoxFrame.cpp