gecko/image/imgRequestProxy.h
2015-05-14 20:52:05 -07:00

247 lines
7.4 KiB
C++

/* -*- 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/. */
#ifndef mozilla_image_imgRequestProxy_h
#define mozilla_image_imgRequestProxy_h
#include "imgIRequest.h"
#include "nsISecurityInfoProvider.h"
#include "nsILoadGroup.h"
#include "nsISupportsPriority.h"
#include "nsITimedChannel.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsThreadUtils.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/gfx/Rect.h"
#include "imgRequest.h"
#include "IProgressObserver.h"
#define NS_IMGREQUESTPROXY_CID \
{ /* 20557898-1dd2-11b2-8f65-9c462ee2bc95 */ \
0x20557898, \
0x1dd2, \
0x11b2, \
{0x8f, 0x65, 0x9c, 0x46, 0x2e, 0xe2, 0xbc, 0x95} \
}
class imgINotificationObserver;
class imgStatusNotifyRunnable;
class ProxyBehaviour;
namespace mozilla {
namespace image {
class Image;
class ImageURL;
class ProgressTracker;
} // namespace image
} // namespace mozilla
class imgRequestProxy : public imgIRequest,
public mozilla::image::IProgressObserver,
public nsISupportsPriority,
public nsISecurityInfoProvider,
public nsITimedChannel
{
protected:
virtual ~imgRequestProxy();
public:
typedef mozilla::image::Image Image;
typedef mozilla::image::ImageURL ImageURL;
typedef mozilla::image::ProgressTracker ProgressTracker;
MOZ_DECLARE_REFCOUNTED_TYPENAME(imgRequestProxy)
NS_DECL_ISUPPORTS
NS_DECL_IMGIREQUEST
NS_DECL_NSIREQUEST
NS_DECL_NSISUPPORTSPRIORITY
NS_DECL_NSISECURITYINFOPROVIDER
// nsITimedChannel declared below
imgRequestProxy();
// Callers to Init or ChangeOwner are required to call NotifyListener after
// (although not immediately after) doing so.
nsresult Init(imgRequest* aOwner,
nsILoadGroup* aLoadGroup,
ImageURL* aURI,
imgINotificationObserver* aObserver);
nsresult ChangeOwner(imgRequest* aNewOwner); // this will change mOwner.
// Do not call this if the
// previous owner has already
// sent notifications out!
void AddToLoadGroup();
void RemoveFromLoadGroup(bool releaseLoadGroup);
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;
// imgIOnloadBlocker methods:
virtual void BlockOnload() override;
virtual void UnblockOnload() override;
// Other, internal-only methods:
virtual void SetHasImage() override;
virtual void OnStartDecode() override;
// Whether we want notifications from ProgressTracker to be deferred until
// an event it has scheduled has been fired.
virtual bool NotificationsDeferred() const override
{
return mDeferNotifications;
}
virtual void SetNotificationsDeferred(bool aDeferNotifications) override
{
mDeferNotifications = aDeferNotifications;
}
// 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();
virtual nsresult Clone(imgINotificationObserver* aObserver,
imgRequestProxy** aClone);
nsresult GetStaticRequest(imgRequestProxy** aReturn);
nsresult GetURI(ImageURL** aURI);
protected:
friend class mozilla::image::ProgressTracker;
friend class imgStatusNotifyRunnable;
class imgCancelRunnable;
friend class imgCancelRunnable;
class imgCancelRunnable : public nsRunnable
{
public:
imgCancelRunnable(imgRequestProxy* owner, nsresult status)
: mOwner(owner), mStatus(status)
{ }
NS_IMETHOD Run() override {
mOwner->DoCancel(mStatus);
return NS_OK;
}
private:
nsRefPtr<imgRequestProxy> mOwner;
nsresult mStatus;
};
/* Finish up canceling ourselves */
void DoCancel(nsresult status);
/* Do the proper refcount management to null out mListener */
void NullOutListener();
void DoRemoveFromLoadGroup() {
RemoveFromLoadGroup(true);
}
// 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()
{
if (!GetOwner()) {
return nullptr;
}
return GetOwner()->GetTimedChannel();
}
already_AddRefed<Image> GetImage() const;
bool HasImage() const;
imgRequest* GetOwner() const;
nsresult PerformClone(imgINotificationObserver* aObserver,
imgRequestProxy* (aAllocFn)(imgRequestProxy*),
imgRequestProxy** aClone);
public:
NS_FORWARD_SAFE_NSITIMEDCHANNEL(TimedChannel())
protected:
nsAutoPtr<ProxyBehaviour> mBehaviour;
private:
friend class imgCacheValidator;
friend imgRequestProxy* NewStaticProxy(imgRequestProxy* aThis);
// The URI of our request.
nsRefPtr<ImageURL> mURI;
// mListener is only promised to be a weak ref (see imgILoader.idl),
// but we actually keep a strong ref to it until we've seen our
// first OnStopRequest.
imgINotificationObserver* mListener;
nsCOMPtr<nsILoadGroup> mLoadGroup;
nsLoadFlags mLoadFlags;
uint32_t mLockCount;
uint32_t mAnimationConsumers;
bool mCanceled;
bool mIsInLoadGroup;
bool mListenerIsStrongRef;
bool mDecodeRequested;
// Whether we want to defer our notifications by the non-virtual Observer
// interfaces as image loads proceed.
bool mDeferNotifications;
};
// Used for static image proxies for which no requests are available, so
// certain behaviours must be overridden to compensate.
class imgRequestProxyStatic : public imgRequestProxy
{
public:
imgRequestProxyStatic(Image* aImage, nsIPrincipal* aPrincipal);
NS_IMETHOD GetImagePrincipal(nsIPrincipal** aPrincipal) override;
using imgRequestProxy::Clone;
virtual nsresult Clone(imgINotificationObserver* aObserver,
imgRequestProxy** aClone) override;
protected:
friend imgRequestProxy* NewStaticProxy(imgRequestProxy*);
// Our principal. We have to cache it, rather than accessing the underlying
// request on-demand, because static proxies don't have an underlying request.
nsCOMPtr<nsIPrincipal> mPrincipal;
};
#endif // mozilla_image_imgRequestProxy_h