/* -*- 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/. */ #include "nsISupports.idl" #include "nsIRequest.idl" #include "imgIContainer.idl" //interface imgIContainer; interface imgINotificationObserver; interface nsIURI; interface nsIPrincipal; /** * imgIRequest interface * * @author Stuart Parmenter * @version 0.1 * @see imagelib2 */ [scriptable, builtinclass, uuid(db0a945c-3883-424a-98d0-2ee0523b0255)] interface imgIRequest : nsIRequest { /** * the image container... * @return the image object associated with the request. * @attention NEED DOCS */ readonly attribute imgIContainer image; /** * Provider ID for image providers created by this image. */ [infallible] readonly attribute unsigned long providerId; /** * The principal for the document that loaded this image. Used when trying to * validate a CORS image load. */ [infallible] readonly attribute nsIPrincipal triggeringPrincipal; /** * Bits set in the return value from imageStatus * @name statusflags * * Meanings: * * STATUS_NONE: Nothing to report. * * STATUS_SIZE_AVAILABLE: We received enough image data * from the network or filesystem that we know the width * and height of the image, and have thus called SetSize() * on the container. * * STATUS_LOAD_COMPLETE: The data has been fully loaded * to memory, but not necessarily fully decoded. * * STATUS_ERROR: An error occurred loading the image. * * STATUS_FRAME_COMPLETE: The first frame has been * completely decoded. * * STATUS_DECODE_COMPLETE: The whole image has been decoded. * * STATUS_IS_ANIMATED: The image is animated. * * STATUS_HAS_TRANSPARENCY: The image is partially or completely transparent. */ //@{ const long STATUS_NONE = 0x0; const long STATUS_SIZE_AVAILABLE = 0x1; const long STATUS_LOAD_COMPLETE = 0x2; const long STATUS_ERROR = 0x4; const long STATUS_FRAME_COMPLETE = 0x8; const long STATUS_DECODE_COMPLETE = 0x10; const long STATUS_IS_ANIMATED = 0x20; const long STATUS_HAS_TRANSPARENCY = 0x40; //@} /** * Status flags of the STATUS_* variety. */ readonly attribute unsigned long imageStatus; /* * Actual error code that generated a STATUS_ERROR imageStatus * (see xpcom/base/ErrorList.h) */ [noscript] readonly attribute nsresult imageErrorCode; /** * The URI the image load was started with. Note that this might not be the * actual URI for the image (e.g. if HTTP redirects happened during the * load). */ [infallible] readonly attribute nsIURI URI; /** * The URI of the resource we ended up loading after all redirects, etc. */ readonly attribute nsIURI finalURI; readonly attribute imgINotificationObserver notificationObserver; readonly attribute string mimeType; /** * The filename that should be used when saving the image. This is determined * from the Content-Disposition, if present, or the uri of the image. This * filename should be validated using nsIMIMEService::GetValidFilenameForSaving * before creating the file. */ readonly attribute ACString fileName; /** * Clone this request; the returned request will have aObserver as the * observer. aObserver will be notified synchronously (before the clone() * call returns) with all the notifications that have already been dispatched * for this image load. */ imgIRequest clone(in imgINotificationObserver aObserver); /** * The principal gotten from the channel the image was loaded from. */ readonly attribute nsIPrincipal imagePrincipal; /** * true if the loading of the image required cross-origin redirects. */ readonly attribute bool hadCrossOriginRedirects; /** * Whether the request is multipart (ie, multipart/x-mixed-replace) */ readonly attribute bool multipart; /** * The CORS mode that this image was loaded with (a mozilla::CORSMode). */ readonly attribute long CORSMode; /** * Cancels this request as in nsIRequest::Cancel(); further, also nulls out * decoderObserver so it gets no further notifications from us. * * NOTE: You should not use this in any new code; instead, use cancel(). Note * that cancel() is asynchronous, which means that some time after you call * it, the listener/observer will get an OnStopRequest(). This means that, if * you're the observer, you can't call cancel() from your destructor. */ void cancelAndForgetObserver(in nsresult aStatus); /** * Requests a synchronous decode for the image. * * imgIContainer has a startDecoding() method, but callers may want to request * a decode before the container has necessarily been instantiated. Calling * startDecoding() on the imgIRequest simply forwards along the request if the * container already exists, or calls it once the container becomes available * if it does not yet exist. */ void startDecoding(in uint32_t aFlags); /** * Exactly like startDecoding above except returns whether the current frame * of the image is complete or not. * * @param aFlags Flags of the FLAG_* variety. Only FLAG_ASYNC_NOTIFY * is accepted; all others are ignored. */ [noscript, notxpcom] boolean startDecodingWithResult(in uint32_t aFlags); /** * This method triggers decoding for an image, but unlike startDecoding() it * enables the caller to provide more detailed information about the decode * request. * * @param aFlags Flags of the FLAG_* variety. * @return DECODE_SURFACE_AVAILABLE if is a surface that satisfies the * request and it is fully decoded. * DECODE_REQUESTED if we requested a decode. * DECODE_REQUEST_FAILED if we failed to request a decode. This means * that either there is an error in the image or we cannot allocate a * surface that big. */ [noscript, notxpcom] imgIContainer_DecodeResult requestDecodeWithResult(in uint32_t aFlags); /*%{C++ DecodeResult RequestDecodeWithResult(uint32_t aFlags); %}*/ /** * Returns true if there is a image and the image has a frame and the frame * currently has a least 1 decoded pixel. Only valid for raster images. */ [noscript, notxpcom] boolean hasDecodedPixels(); /** * Locks an image. If the image does not exist yet, locks it once it becomes * available. The lock persists for the lifetime of the imgIRequest (until * unlockImage is called) even if the underlying image changes. * * If you don't call unlockImage() by the time this imgIRequest goes away, it * will be called for you automatically. * * @see imgIContainer::lockImage for documentation of the underlying call. */ void lockImage(); /** * Unlocks an image. * * @see imgIContainer::unlockImage for documentation of the underlying call. */ void unlockImage(); /** * If this image is unlocked, discard the image's decoded data. If the image * is locked or is already discarded, do nothing. */ void requestDiscard(); /** * If this request is for an animated image, the method creates a new * request which contains the current frame of the image. * Otherwise returns the same request. */ imgIRequest getStaticRequest(); /** * Requests that the image animate (if it has an animation). * * @see Image::IncrementAnimationConsumers for documentation of the * underlying call. */ void incrementAnimationConsumers(); /** * Tell the image it can forget about a request that the image animate. * * @see Image::DecrementAnimationConsumers for documentation of the * underlying call. */ void decrementAnimationConsumers(); /** * Request loading priority boost to requested category, each category * of request increases priority only one time. * * CATEGORY_FRAME_INIT: increase priority when the imgRequest is associated * with an nsImageFrame. * * CATEGORY_FRAME_STYLE: increase priority when the imgRequest is for a CSS * background-image, list-style-image, etc. on a ComputedStyle, and a frame * has been assigned this ComputedStyle. * * CATEGORY_SIZE_QUERY: increase priority when size decoding is necessary to * determine the layout size of an associated nsImageFrame. * * CATEGORY_DISPLAY: increase priority when the image is about to be displayed * in the viewport. */ const uint32_t CATEGORY_FRAME_INIT = 1 << 0; const uint32_t CATEGORY_FRAME_STYLE = 1 << 1; const uint32_t CATEGORY_SIZE_QUERY = 1 << 2; const uint32_t CATEGORY_DISPLAY = 1 << 3; void boostPriority(in uint32_t aCategory); };