gecko/modules/libpr0n/public/imgITools.idl

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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2007
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 * Contributor(s):
 *   Justin Dolske <dolske@mozilla.com> (original author)
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#include "nsISupports.idl"

interface nsIInputStream;
interface imgIContainer;

[scriptable, uuid(c395d8f1-c616-4a1b-adfd-747b4b1b2cbe)]
interface imgITools : nsISupports
{
    /**
     * decodeImageData
     * Caller provides an input stream and mimetype. We read from the stream
     * and decompress it (according to the specified mime type) and return
     * the resulting imgIContainer. (If the caller already has a container,
     * it can be provided as input to be reused).
     *
     * @param aStream
     *        An input stream for an encoded image file.
     * @param aMimeType
     *        Type of image in the stream.
     * @param aContainer
     *        An imgIContainer holding the decoded image. Specify |null| when
     *        calling to have one created, otherwise specify a container to
     *        be used. It is an error to pass an already-initialized container
     *        as aContainer.
     */
    void decodeImageData(in nsIInputStream aStream,
                         in ACString aMimeType,
                         inout imgIContainer aContainer);

    /**
     * encodeImage
     * Caller provides an image container, and the mime type it should be
     * encoded to. We return an input stream for the encoded image data.
     *
     * @param aContainer
     *        An image container.
     * @param aMimeType
     *        Type of encoded image desired (eg "image/png").
     */
    nsIInputStream encodeImage(in imgIContainer aContainer,
                               in ACString aMimeType);

    /**
     * encodeScaledImage
     * Caller provides an image container, and the mime type it should be
     * encoded to. We return an input stream for the encoded image data.
     * The encoded image is scaled to the specified dimensions.
     *
     * @param aContainer
     *        An image container.
     * @param aMimeType
     *        Type of encoded image desired (eg "image/png").
     * @param aWidth, aHeight
     *        The size (in pixels) desired for the resulting image.
     */
    nsIInputStream encodeScaledImage(in imgIContainer aContainer,
                                     in ACString aMimeType,
                                     in long aWidth,
                                     in long aHeight);
};