image/imgIRequest.idl
author Henrik Skupin <mail@hskupin.info>
Fri, 30 Nov 2018 13:27:22 +0000
changeset 448968 cd370c35d88d82c719e7b3d70ae1da003c8cb7f6
parent 392888 76b5c4e2c6a200e017161f60f61bdbe525f3f45d
child 459542 43678f936e37673d325bd3bf3d300ea69aad5bae
permissions -rw-r--r--
Bug 1511311 - [marionette] GeckoInstance classes should not overwrite already set custom preferences. r=automatedtester Custom preferences as passed into both classes via the constructor are getting set in the base GeckoInstance class. But both the DesktopInstance and FennecInstance classes could override those custom preferences if they have the same preference set as required preference. As such the custom preference doesn't have any effect. This patch allows both classes to override required prefs with a different value. Differential Revision: https://phabricator.services.mozilla.com/D13522

/* -*- 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"

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;

  /**
   * 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;

  /**
   * 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.
   */
  [noscript, notxpcom] boolean startDecodingWithResult(in 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_SIZE_QUERY: increase priority when size decoding is necessary to
   * determine the layout size of the 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_SIZE_QUERY = 1 << 1;
  const uint32_t CATEGORY_DISPLAY    = 1 << 2;
  void boostPriority(in uint32_t aCategory);
};