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d72aa193c4
MozReview-Commit-ID: DrblTjP99WJ --HG-- extra : rebase_source : 649cf6757266c9e08a3f5a621c3e9451a7ccef67
540 lines
19 KiB
C++
540 lines
19 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* A base class which implements nsIImageLoadingContent and can be
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* subclassed by various content nodes that want to provide image
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* loading functionality (eg <img>, <object>, etc).
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*/
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#ifndef nsImageLoadingContent_h__
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#define nsImageLoadingContent_h__
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#include "imgINotificationObserver.h"
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#include "imgIOnloadBlocker.h"
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#include "mozilla/CORSMode.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/TimeStamp.h"
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#include "nsCOMPtr.h"
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#include "nsIImageLoadingContent.h"
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#include "nsIRequest.h"
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#include "mozilla/ErrorResult.h"
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#include "nsIContentPolicy.h"
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#include "mozilla/dom/BindingDeclarations.h"
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#include "mozilla/net/ReferrerPolicy.h"
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class nsIURI;
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class nsIDocument;
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class nsPresContext;
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class nsIContent;
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class imgRequestProxy;
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namespace mozilla {
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class AsyncEventDispatcher;
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} // namespace mozilla
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#ifdef LoadImage
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// Undefine LoadImage to prevent naming conflict with Windows.
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#undef LoadImage
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#endif
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class nsImageLoadingContent : public nsIImageLoadingContent,
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public imgIOnloadBlocker
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{
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template <typename T> using Maybe = mozilla::Maybe<T>;
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using Nothing = mozilla::Nothing;
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using OnNonvisible = mozilla::OnNonvisible;
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using Visibility = mozilla::Visibility;
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/* METHODS */
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public:
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nsImageLoadingContent();
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virtual ~nsImageLoadingContent();
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NS_DECL_IMGINOTIFICATIONOBSERVER
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NS_DECL_NSIIMAGELOADINGCONTENT
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NS_DECL_IMGIONLOADBLOCKER
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// Web IDL binding methods.
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// Note that the XPCOM SetLoadingEnabled, AddObserver, RemoveObserver,
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// ForceImageState methods are OK for Web IDL bindings to use as well,
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// since none of them throw when called via the Web IDL bindings.
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bool LoadingEnabled() const { return mLoadingEnabled; }
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int16_t ImageBlockingStatus() const
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{
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return mImageBlockingStatus;
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}
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already_AddRefed<imgIRequest>
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GetRequest(int32_t aRequestType, mozilla::ErrorResult& aError);
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int32_t
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GetRequestType(imgIRequest* aRequest, mozilla::ErrorResult& aError);
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already_AddRefed<nsIURI> GetCurrentURI(mozilla::ErrorResult& aError);
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void ForceReload(const mozilla::dom::Optional<bool>& aNotify,
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mozilla::ErrorResult& aError);
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// XPCOM [optional] syntax helper
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nsresult ForceReload(bool aNotify = true) {
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return ForceReload(aNotify, 1);
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}
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protected:
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enum ImageLoadType {
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// Most normal image loads
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eImageLoadType_Normal,
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// From a <img srcset> or <picture> context. Affects type given to content
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// policy.
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eImageLoadType_Imageset
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};
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/**
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* LoadImage is called by subclasses when the appropriate
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* attributes (eg 'src' for <img> tags) change. The string passed
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* in is the new uri string; this consolidates the code for getting
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* the charset, constructing URI objects, and any other incidentals
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* into this superclass.
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*
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* @param aNewURI the URI spec to be loaded (may be a relative URI)
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* @param aForce If true, make sure to load the URI. If false, only
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* load if the URI is different from the currently loaded URI.
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* @param aNotify If true, nsIDocumentObserver state change notifications
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* will be sent as needed.
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* @param aImageLoadType The ImageLoadType for this request
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* @param aTriggeringPrincipal Optional parameter specifying the triggering
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* principal to use for the image load
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*/
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nsresult LoadImage(const nsAString& aNewURI, bool aForce,
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bool aNotify, ImageLoadType aImageLoadType,
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nsIPrincipal* aTriggeringPrincipal = nullptr);
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/**
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* ImageState is called by subclasses that are computing their content state.
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* The return value will have the NS_EVENT_STATE_BROKEN,
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* NS_EVENT_STATE_USERDISABLED, and NS_EVENT_STATE_SUPPRESSED bits set as
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* needed. Note that this state assumes that this node is "trying" to be an
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* image (so for example complete lack of attempt to load an image will lead
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* to NS_EVENT_STATE_BROKEN being set). Subclasses that are not "trying" to
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* be an image (eg an HTML <input> of type other than "image") should just
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* not call this method when computing their intrinsic state.
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*/
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mozilla::EventStates ImageState() const;
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/**
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* LoadImage is called by subclasses when the appropriate
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* attributes (eg 'src' for <img> tags) change. If callers have an
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* URI object already available, they should use this method.
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*
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* @param aNewURI the URI to be loaded
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* @param aForce If true, make sure to load the URI. If false, only
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* load if the URI is different from the currently loaded URI.
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* @param aNotify If true, nsIDocumentObserver state change notifications
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* will be sent as needed.
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* @param aImageLoadType The ImageLoadType for this request
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* @param aLoadStart If true, dispatch "loadstart" event.
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* @param aDocument Optional parameter giving the document this node is in.
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* This is purely a performance optimization.
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* @param aLoadFlags Optional parameter specifying load flags to use for
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* the image load
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* @param aTriggeringPrincipal Optional parameter specifying the triggering
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* principal to use for the image load
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*/
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nsresult LoadImage(nsIURI* aNewURI, bool aForce, bool aNotify,
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ImageLoadType aImageLoadType, bool aLoadStart = true,
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nsIDocument* aDocument = nullptr,
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nsLoadFlags aLoadFlags = nsIRequest::LOAD_NORMAL,
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nsIPrincipal* aTriggeringPrincipal = nullptr);
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nsresult LoadImage(nsIURI* aNewURI, bool aForce, bool aNotify,
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ImageLoadType aImageLoadType,
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nsIPrincipal* aTriggeringPrincipal)
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{
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return LoadImage(aNewURI, aForce, aNotify, aImageLoadType,
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true, nullptr, nsIRequest::LOAD_NORMAL,
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aTriggeringPrincipal);
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}
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/**
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* helpers to get the document for this content (from the nodeinfo
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* and such). Not named GetOwnerDoc/GetCurrentDoc to prevent ambiguous
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* method names in subclasses
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*
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* @return the document we belong to
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*/
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nsIDocument* GetOurOwnerDoc();
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nsIDocument* GetOurCurrentDoc();
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/**
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* Helper function to get the frame associated with this content. Not named
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* GetPrimaryFrame to prevent ambiguous method names in subclasses.
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*
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* @return The frame which we belong to, or nullptr if it doesn't exist.
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*/
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nsIFrame* GetOurPrimaryFrame();
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/**
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* Helper function to get the PresContext associated with this content's
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* frame. Not named GetPresContext to prevent ambiguous method names in
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* subclasses.
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*
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* @return The nsPresContext associated with our frame, or nullptr if either
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* the frame doesn't exist, or the frame's prescontext doesn't exist.
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*/
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nsPresContext* GetFramePresContext();
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/**
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* CancelImageRequests is called by subclasses when they want to
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* cancel all image requests (for example when the subclass is
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* somehow not an image anymore).
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*/
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void CancelImageRequests(bool aNotify);
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/**
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* UseAsPrimaryRequest is called by subclasses when they have an existing
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* imgRequestProxy that they want this nsImageLoadingContent to use. This may
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* effectively be called instead of LoadImage or LoadImageWithChannel.
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* If aNotify is true, this method will notify on state changes.
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*/
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nsresult UseAsPrimaryRequest(imgRequestProxy* aRequest, bool aNotify,
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ImageLoadType aImageLoadType);
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/**
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* Derived classes of nsImageLoadingContent MUST call
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* DestroyImageLoadingContent from their destructor, or earlier. It
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* does things that cannot be done in ~nsImageLoadingContent because
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* they rely on being able to QueryInterface to other derived classes,
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* which cannot happen once the derived class destructor has started
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* calling the base class destructors.
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*/
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void DestroyImageLoadingContent();
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void ClearBrokenState() { mBroken = false; }
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/**
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* Returns the CORS mode that will be used for all future image loads. The
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* default implementation returns CORS_NONE unconditionally.
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*/
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virtual mozilla::CORSMode GetCORSMode();
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virtual mozilla::net::ReferrerPolicy GetImageReferrerPolicy();
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// Subclasses are *required* to call BindToTree/UnbindFromTree.
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void BindToTree(nsIDocument* aDocument, nsIContent* aParent,
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nsIContent* aBindingParent, bool aCompileEventHandlers);
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void UnbindFromTree(bool aDeep, bool aNullParent);
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nsresult OnLoadComplete(imgIRequest* aRequest, nsresult aStatus);
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void OnUnlockedDraw();
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nsresult OnImageIsAnimated(imgIRequest *aRequest);
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// The nsContentPolicyType we would use for this ImageLoadType
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static nsContentPolicyType PolicyTypeForLoad(ImageLoadType aImageLoadType);
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void AsyncEventRunning(mozilla::AsyncEventDispatcher* aEvent);
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// Get ourselves as an nsIContent*. Not const because some of the callers
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// want a non-const nsIContent.
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virtual nsIContent* AsContent() = 0;
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private:
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/**
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* Struct used to manage the native image observers.
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*/
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struct ImageObserver {
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explicit ImageObserver(imgINotificationObserver* aObserver);
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~ImageObserver();
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nsCOMPtr<imgINotificationObserver> mObserver;
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ImageObserver* mNext;
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};
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/**
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* Struct used to manage the scripted/XPCOM image observers.
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*/
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class ScriptedImageObserver final {
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public:
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NS_INLINE_DECL_REFCOUNTING(ScriptedImageObserver)
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ScriptedImageObserver(imgINotificationObserver* aObserver,
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RefPtr<imgRequestProxy>&& aCurrentRequest,
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RefPtr<imgRequestProxy>&& aPendingRequest);
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bool CancelRequests();
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nsCOMPtr<imgINotificationObserver> mObserver;
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RefPtr<imgRequestProxy> mCurrentRequest;
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RefPtr<imgRequestProxy> mPendingRequest;
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private:
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~ScriptedImageObserver();
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};
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/**
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* Struct to report state changes
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*/
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struct AutoStateChanger {
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AutoStateChanger(nsImageLoadingContent* aImageContent,
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bool aNotify) :
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mImageContent(aImageContent),
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mNotify(aNotify)
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{
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mImageContent->mStateChangerDepth++;
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}
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~AutoStateChanger()
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{
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mImageContent->mStateChangerDepth--;
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mImageContent->UpdateImageState(mNotify);
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}
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nsImageLoadingContent* mImageContent;
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bool mNotify;
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};
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friend struct AutoStateChanger;
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/**
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* UpdateImageState recomputes the current state of this image loading
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* content and updates what ImageState() returns accordingly. It will also
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* fire a ContentStatesChanged() notification as needed if aNotify is true.
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*/
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void UpdateImageState(bool aNotify);
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/**
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* Method to fire an event once we know what's going on with the image load.
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*
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* @param aEventType "loadstart", "loadend", "load", or "error" depending on
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* how things went
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* @param aIsCancelable true if event is cancelable.
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*/
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nsresult FireEvent(const nsAString& aEventType, bool aIsCancelable = false);
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/**
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* Method to cancel and null-out pending event if they exist.
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*/
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void CancelPendingEvent();
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RefPtr<mozilla::AsyncEventDispatcher> mPendingEvent;
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protected:
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/**
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* Method to create an nsIURI object from the given string (will
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* handle getting the right charset, base, etc). You MUST pass in a
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* non-null document to this function.
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*
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* @param aSpec the string spec (from an HTML attribute, eg)
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* @param aDocument the document we belong to
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* @return the URI we want to be loading
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*/
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nsresult StringToURI(const nsAString& aSpec, nsIDocument* aDocument,
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nsIURI** aURI);
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void CreateStaticImageClone(nsImageLoadingContent* aDest) const;
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/**
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* Prepare and returns a reference to the "next request". If there's already
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* a _usable_ current request (one with SIZE_AVAILABLE), this request is
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* "pending" until it becomes usable. Otherwise, this becomes the current
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* request.
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*
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* @param aImageLoadType The ImageLoadType for this request
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*/
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RefPtr<imgRequestProxy>& PrepareNextRequest(ImageLoadType aImageLoadType);
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/**
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* Returns a COMPtr reference to the current/pending image requests, cleaning
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* up and canceling anything that was there before. Note that if you just want
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* to get rid of one of the requests, you should call
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* Clear*Request(NS_BINDING_ABORTED) instead.
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*
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* @param aImageLoadType The ImageLoadType for this request
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*/
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RefPtr<imgRequestProxy>& PrepareCurrentRequest(ImageLoadType aImageLoadType);
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RefPtr<imgRequestProxy>& PreparePendingRequest(ImageLoadType aImageLoadType);
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/**
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* Switch our pending request to be our current request.
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* mPendingRequest must be non-null!
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*/
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void MakePendingRequestCurrent();
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/**
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* Cancels and nulls-out the "current" and "pending" requests if they exist.
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*
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* @param aNonvisibleAction An action to take if the image is no longer
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* visible as a result; see |UntrackImage|.
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*/
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void ClearCurrentRequest(nsresult aReason,
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const Maybe<OnNonvisible>& aNonvisibleAction = Nothing());
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void ClearPendingRequest(nsresult aReason,
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const Maybe<OnNonvisible>& aNonvisibleAction = Nothing());
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/**
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* Retrieve a pointer to the 'registered with the refresh driver' flag for
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* which a particular image request corresponds.
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*
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* @returns A pointer to the boolean flag for a given image request, or
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* |nullptr| if the request is not either |mPendingRequest| or
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* |mCurrentRequest|.
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*/
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bool* GetRegisteredFlagForRequest(imgIRequest* aRequest);
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/**
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* Reset animation of the current request if |mNewRequestsWillNeedAnimationReset|
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* was true when the request was prepared.
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*/
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void ResetAnimationIfNeeded();
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/**
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* Static helper method to tell us if we have the size of a request. The
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* image may be null.
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*/
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static bool HaveSize(imgIRequest *aImage);
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/**
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* Adds/Removes a given imgIRequest from our document's tracker.
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*
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* No-op if aImage is null.
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*
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* @param aFrame If called from FrameCreated the frame passed to FrameCreated.
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* This is our frame, but at the time of the FrameCreated call
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* our primary frame pointer hasn't been set yet, so this is
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* only way to get our frame.
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*
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* @param aNonvisibleAction A requested action if the frame has become
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* nonvisible. If Nothing(), no action is
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* requested. If DISCARD_IMAGES is specified, the
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* frame is requested to ask any images it's
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* associated with to discard their surfaces if
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* possible.
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*/
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void TrackImage(imgIRequest* aImage, nsIFrame* aFrame = nullptr);
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void UntrackImage(imgIRequest* aImage,
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const Maybe<OnNonvisible>& aNonvisibleAction = Nothing());
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/* MEMBERS */
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RefPtr<imgRequestProxy> mCurrentRequest;
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RefPtr<imgRequestProxy> mPendingRequest;
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uint32_t mCurrentRequestFlags;
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uint32_t mPendingRequestFlags;
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enum {
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// Set if the request needs ResetAnimation called on it.
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REQUEST_NEEDS_ANIMATION_RESET = 0x00000001U,
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// Set if the request is blocking onload.
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REQUEST_BLOCKS_ONLOAD = 0x00000002U,
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// Set if the request is currently tracked with the document.
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REQUEST_IS_TRACKED = 0x00000004U,
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// Set if this is an imageset request, such as from <img srcset> or
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// <picture>
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REQUEST_IS_IMAGESET = 0x00000008U
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};
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// If the image was blocked or if there was an error loading, it's nice to
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// still keep track of what the URI was despite not having an imgIRequest.
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// We only maintain this in those situations (in the common case, this is
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// always null).
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nsCOMPtr<nsIURI> mCurrentURI;
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private:
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/**
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* Clones the given "current" or "pending" request for each scripted observer.
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*/
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void CloneScriptedRequests(imgRequestProxy* aRequest);
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/**
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* Cancels and nulls-out the "current" or "pending" requests if they exist
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* for each scripted observer.
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*/
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void ClearScriptedRequests(int32_t aRequestType, nsresult aReason);
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/**
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* Moves the "pending" request into the "current" request for each scripted
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* observer. If there is an existing "current" request, it will cancel it
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* first.
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*/
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void MakePendingScriptedRequestsCurrent();
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/**
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* Typically we will have only one observer (our frame in the screen
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* prescontext), so we want to only make space for one and to
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* heap-allocate anything past that (saves memory and malloc churn
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* in the common case). The storage is a linked list, we just
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* happen to actually hold the first observer instead of a pointer
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* to it.
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*/
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ImageObserver mObserverList;
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/**
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* Typically we will have no scripted observers, as this is only used by
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* chrome, legacy extensions, and some mochitests. An empty array reserves
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* minimal memory.
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*/
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nsTArray<RefPtr<ScriptedImageObserver>> mScriptedObservers;
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/**
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* When mIsImageStateForced is true, this holds the ImageState that we'll
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* return in ImageState().
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*/
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mozilla::EventStates mForcedImageState;
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mozilla::TimeStamp mMostRecentRequestChange;
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int16_t mImageBlockingStatus;
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bool mLoadingEnabled : 1;
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/**
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* When true, we return mForcedImageState from ImageState().
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*/
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bool mIsImageStateForced : 1;
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/**
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* The state we had the last time we checked whether we needed to notify the
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* document of a state change. These are maintained by UpdateImageState.
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*/
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bool mLoading : 1;
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bool mBroken : 1;
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bool mUserDisabled : 1;
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bool mSuppressed : 1;
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protected:
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/**
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* A hack to get animations to reset, see bug 594771. On requests
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* that originate from setting .src, we mark them for needing their animation
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* reset when they are ready. mNewRequestsWillNeedAnimationReset is set to
|
|
* true while preparing such requests (as a hack around needing to change an
|
|
* interface), and the other two booleans store which of the current
|
|
* and pending requests are of the sort that need their animation restarted.
|
|
*/
|
|
bool mNewRequestsWillNeedAnimationReset : 1;
|
|
|
|
/**
|
|
* Flag to indicate whether the channel should be mark as urgent-start.
|
|
* It should be set in *Element and passed to nsContentUtils::LoadImage.
|
|
* True if we want to set nsIClassOfService::UrgentStart to the channel to
|
|
* get the response ASAP for better user responsiveness.
|
|
*/
|
|
bool mUseUrgentStartForChannel;
|
|
private:
|
|
/* The number of nested AutoStateChangers currently tracking our state. */
|
|
uint8_t mStateChangerDepth;
|
|
|
|
// Flags to indicate whether each of the current and pending requests are
|
|
// registered with the refresh driver.
|
|
bool mCurrentRequestRegistered;
|
|
bool mPendingRequestRegistered;
|
|
|
|
// TODO:
|
|
// Bug 1353685: Should ServiceWorker call SetBlockedRequest?
|
|
//
|
|
// This member is used in SetBlockedRequest, if it's true, then this call is
|
|
// triggered from LoadImage.
|
|
// If this is false, it means this call is from other places like
|
|
// ServiceWorker, then we will ignore call to SetBlockedRequest for now.
|
|
//
|
|
// Also we use this variable to check if some evil code is reentering LoadImage.
|
|
bool mIsStartingImageLoad;
|
|
};
|
|
|
|
#endif // nsImageLoadingContent_h__
|