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Diffstat (limited to 'image/imgIRequest.idl')
| -rw-r--r-- | image/imgIRequest.idl | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/image/imgIRequest.idl b/image/imgIRequest.idl new file mode 100644 index 0000000000..dbadd2bf52 --- /dev/null +++ b/image/imgIRequest.idl @@ -0,0 +1,268 @@ +/* -*- 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 <stuart@mozilla.com> + * @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; + + /** + * Producer ID for image containers created by this image. + */ + [infallible] readonly attribute unsigned long producerId; + + /** + * 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). + */ + 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; + + /** + * 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; + + /** + * CORS modes images can be loaded with. + * + * By default, all images are loaded with CORS_NONE and cannot be used + * cross-origin in context like WebGL. + * + * If an HTML img element has the crossorigin attribute set, the imgIRequest + * will be validated for cross-origin usage with CORS, and, if successful, + * will have its CORS mode set to the relevant type. + */ + //@{ + const long CORS_NONE = 1; + const long CORS_ANONYMOUS = 2; + const long CORS_USE_CREDENTIALS = 3; + //@} + + /** + * The CORS mode that this image was loaded with. + */ + 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); +%}*/ + + + /** + * 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); +}; + |