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/* -*- 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 */
#ifndef mozilla_image_imgRequestProxy_h
#define mozilla_image_imgRequestProxy_h
#include "imgIRequest.h"
#include "nsIPrincipal.h"
#include "nsISupportsPriority.h"
#include "nsITimedChannel.h"
#include "nsCOMPtr.h"
#include "nsThreadUtils.h"
#include "mozilla/PreloaderBase.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/gfx/Rect.h"
#include "IProgressObserver.h"
{ /* 20557898-1dd2-11b2-8f65-9c462ee2bc95 */ \
0x20557898, 0x1dd2, 0x11b2, { \
0x8f, 0x65, 0x9c, 0x46, 0x2e, 0xe2, 0xbc, 0x95 \
} \
class imgCacheValidator;
class imgINotificationObserver;
class imgRequest;
class imgStatusNotifyRunnable;
class ProxyBehaviour;
namespace mozilla {
namespace image {
class Image;
class ProgressTracker;
} // namespace image
} // namespace mozilla
class imgRequestProxy : public mozilla::PreloaderBase,
public imgIRequest,
public mozilla::image::IProgressObserver,
public nsISupportsPriority,
public nsITimedChannel {
virtual ~imgRequestProxy();
typedef mozilla::dom::Document Document;
typedef mozilla::image::Image Image;
typedef mozilla::image::ProgressTracker ProgressTracker;
// nsITimedChannel declared below
// Callers to Init or ChangeOwner are required to call NotifyListener after
// (although not immediately after) doing so.
nsresult Init(imgRequest* aOwner, nsILoadGroup* aLoadGroup, nsIURI* aURI,
imgINotificationObserver* aObserver);
nsresult ChangeOwner(imgRequest* aNewOwner); // this will change mOwner.
// Do not call this if the
// previous owner has already
// sent notifications out!
// Add the request to the load group, if any. This should only be called once
// during initialization.
void AddToLoadGroup();
inline bool HasObserver() const { return mListener != nullptr; }
// Asynchronously notify this proxy's listener of the current state of the
// image, and, if we have an imgRequest mOwner, any status changes that
// happen between the time this function is called and the time the
// notification is scheduled.
void NotifyListener();
// Synchronously notify this proxy's listener of the current state of the
// image. Only use this function if you are currently servicing an
// asynchronously-called function.
void SyncNotifyListener();
// imgINotificationObserver methods:
virtual void Notify(int32_t aType,
const mozilla::gfx::IntRect* aRect = nullptr) override;
virtual void OnLoadComplete(bool aLastPart) override;
// Other, internal-only methods:
virtual void SetHasImage() override;
// Whether we want notifications from ProgressTracker to be deferred until
// an event it has scheduled has been fired and/or validation is complete.
virtual bool NotificationsDeferred() const override {
return IsValidating() || mPendingNotify;
virtual void MarkPendingNotify() override { mPendingNotify = true; }
virtual void ClearPendingNotify() override { mPendingNotify = false; }
bool IsValidating() const { return mValidating; }
void MarkValidating();
void ClearValidating();
// Flags this image load as not cancelable temporarily. This is needed so that
// stylesheets can be shared across documents properly, see bug 1800979.
void SetCancelable(bool);
// Removes all animation consumers that were created with
// IncrementAnimationConsumers. This is necessary since we need
// to do it before the proxy itself is destroyed. See
// imgRequest::RemoveProxy
void ClearAnimationConsumers();
nsresult SyncClone(imgINotificationObserver* aObserver,
Document* aLoadingDocument, imgRequestProxy** aClone);
nsresult Clone(imgINotificationObserver* aObserver,
Document* aLoadingDocument, imgRequestProxy** aClone);
already_AddRefed<imgRequestProxy> GetStaticRequest(
Document* aLoadingDocument);
imgRequest* GetOwner() const;
friend class mozilla::image::ProgressTracker;
friend class imgStatusNotifyRunnable;
class imgCancelRunnable;
friend class imgCancelRunnable;
class imgCancelRunnable : public mozilla::Runnable {
imgCancelRunnable(imgRequestProxy* owner, nsresult status)
: Runnable("imgCancelRunnable"), mOwner(owner), mStatus(status) {}
NS_IMETHOD Run() override {
return NS_OK;
RefPtr<imgRequestProxy> mOwner;
nsresult mStatus;
/* Remove from and forget the load group. */
void RemoveFromLoadGroup();
/* Remove from the load group and re-add as a background request. */
void MoveToBackgroundInLoadGroup();
/* Finish up canceling ourselves */
void DoCancel(nsresult status);
/* Do the proper refcount management to null out mListener */
void NullOutListener();
// Return the ProgressTracker associated with mOwner and/or mImage. It may
// live either on mOwner or mImage, depending on whether
// (a) we have an mOwner at all
// (b) whether mOwner has instantiated its image yet
already_AddRefed<ProgressTracker> GetProgressTracker() const;
nsITimedChannel* TimedChannel();
already_AddRefed<Image> GetImage() const;
bool HasImage() const;
imgCacheValidator* GetValidator() const;
nsresult PerformClone(imgINotificationObserver* aObserver,
Document* aLoadingDocument, bool aSyncNotify,
imgRequestProxy** aClone);
virtual imgRequestProxy* NewClonedProxy();