mirror of
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207 lines
6.2 KiB
Plaintext
207 lines
6.2 KiB
Plaintext
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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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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#include "nsISupports.idl"
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#include "nsIRequest.idl"
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interface imgIContainer;
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interface imgINotificationObserver;
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interface nsIURI;
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interface nsIPrincipal;
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/**
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* imgIRequest interface
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*
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* @author Stuart Parmenter <stuart@mozilla.com>
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* @version 0.1
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* @see imagelib2
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*/
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[scriptable, builtinclass, uuid(db0a945c-3883-424a-98d0-2ee0523b0255)]
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interface imgIRequest : nsIRequest
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{
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/**
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* the image container...
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* @return the image object associated with the request.
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* @attention NEED DOCS
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*/
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readonly attribute imgIContainer image;
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/**
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* Bits set in the return value from imageStatus
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* @name statusflags
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*
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* Meanings:
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*
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* STATUS_NONE: Nothing to report.
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*
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* STATUS_SIZE_AVAILABLE: We received enough image data
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* from the network or filesystem that we know the width
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* and height of the image, and have thus called SetSize()
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* on the container.
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*
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* STATUS_LOAD_COMPLETE: The data has been fully loaded
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* to memory, but not necessarily fully decoded.
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*
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* STATUS_ERROR: An error occurred loading the image.
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*
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* STATUS_FRAME_COMPLETE: The first frame has been
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* completely decoded.
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*
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* STATUS_DECODE_COMPLETE: The whole image has been decoded.
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*
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* STATUS_IS_ANIMATED: The image is animated.
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*
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* STATUS_HAS_TRANSPARENCY: The image is partially or completely transparent.
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*/
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//@{
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const long STATUS_NONE = 0x0;
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const long STATUS_SIZE_AVAILABLE = 0x1;
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const long STATUS_LOAD_COMPLETE = 0x2;
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const long STATUS_ERROR = 0x4;
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const long STATUS_FRAME_COMPLETE = 0x8;
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const long STATUS_DECODE_COMPLETE = 0x10;
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const long STATUS_IS_ANIMATED = 0x20;
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const long STATUS_HAS_TRANSPARENCY = 0x40;
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//@}
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/**
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* Status flags of the STATUS_* variety.
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*/
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readonly attribute unsigned long imageStatus;
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/*
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* Actual error code that generated a STATUS_ERROR imageStatus
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* (see xpcom/base/ErrorList.h)
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*/
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[noscript] readonly attribute nsresult imageErrorCode;
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/**
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* The URI the image load was started with. Note that this might not be the
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* actual URI for the image (e.g. if HTTP redirects happened during the
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* load).
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*/
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readonly attribute nsIURI URI;
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/**
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* The URI of the resource we ended up loading after all redirects, etc.
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*/
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readonly attribute nsIURI currentURI;
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readonly attribute imgINotificationObserver notificationObserver;
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readonly attribute string mimeType;
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/**
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* Clone this request; the returned request will have aObserver as the
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* observer. aObserver will be notified synchronously (before the clone()
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* call returns) with all the notifications that have already been dispatched
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* for this image load.
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*/
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imgIRequest clone(in imgINotificationObserver aObserver);
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/**
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* The principal gotten from the channel the image was loaded from.
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*/
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readonly attribute nsIPrincipal imagePrincipal;
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/**
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* Whether the request is multipart (ie, multipart/x-mixed-replace)
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*/
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readonly attribute bool multipart;
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/**
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* CORS modes images can be loaded with.
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*
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* By default, all images are loaded with CORS_NONE and cannot be used
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* cross-origin in context like WebGL.
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*
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* If an HTML img element has the crossorigin attribute set, the imgIRequest
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* will be validated for cross-origin usage with CORS, and, if successful,
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* will have its CORS mode set to the relevant type.
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*/
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//@{
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const long CORS_NONE = 1;
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const long CORS_ANONYMOUS = 2;
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const long CORS_USE_CREDENTIALS = 3;
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//@}
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/**
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* The CORS mode that this image was loaded with.
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*/
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readonly attribute long CORSMode;
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/**
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* Cancels this request as in nsIRequest::Cancel(); further, also nulls out
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* decoderObserver so it gets no further notifications from us.
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*
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* NOTE: You should not use this in any new code; instead, use cancel(). Note
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* that cancel() is asynchronous, which means that some time after you call
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* it, the listener/observer will get an OnStopRequest(). This means that, if
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* you're the observer, you can't call cancel() from your destructor.
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*/
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void cancelAndForgetObserver(in nsresult aStatus);
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/**
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* Requests a synchronous decode for the image.
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*
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* imgIContainer has a startDecoding() method, but callers may want to request
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* a decode before the container has necessarily been instantiated. Calling
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* startDecoding() on the imgIRequest simply forwards along the request if the
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* container already exists, or calls it once the container becomes available
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* if it does not yet exist.
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*/
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void startDecoding();
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/**
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* Locks an image. If the image does not exist yet, locks it once it becomes
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* available. The lock persists for the lifetime of the imgIRequest (until
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* unlockImage is called) even if the underlying image changes.
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*
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* If you don't call unlockImage() by the time this imgIRequest goes away, it
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* will be called for you automatically.
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*
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* @see imgIContainer::lockImage for documentation of the underlying call.
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*/
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void lockImage();
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/**
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* Unlocks an image.
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*
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* @see imgIContainer::unlockImage for documentation of the underlying call.
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*/
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void unlockImage();
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/**
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* If this image is unlocked, discard the image's decoded data. If the image
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* is locked or is already discarded, do nothing.
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*/
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void requestDiscard();
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/**
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* If this request is for an animated image, the method creates a new
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* request which contains the current frame of the image.
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* Otherwise returns the same request.
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*/
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imgIRequest getStaticRequest();
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/**
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* Requests that the image animate (if it has an animation).
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*
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* @see Image::IncrementAnimationConsumers for documentation of the
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* underlying call.
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*/
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void incrementAnimationConsumers();
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/**
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* Tell the image it can forget about a request that the image animate.
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*
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* @see Image::DecrementAnimationConsumers for documentation of the
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* underlying call.
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*/
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void decrementAnimationConsumers();
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};
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