gecko-dev/gfx/idl/gfxIImageFrame.idl

/** -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2001
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Stuart Parmenter <pavlov@netscape.com>
 *   Chris Saari <saari@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
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 * the provisions above, a recipient may use your version of this file under
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 *
 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"
#include "gfxtypes.idl"
#include "gfxIFormats.idl"

%{C++
#include "nsRect.h"
%}

native nsRectRef(nsIntRect &);

/**
 * gfxIImageFrame interface
 *
 * All x, y, width, height values are in pixels.
 *
 * @author Tim Rowley <tor@cs.brown.edu>
 * @author Stuart Parmenter <pavlov@netscape.com>
 * @version 0.1
 */
[scriptable, uuid(20caf74f-2c35-450f-9f87-c3ecc213553c)]
interface gfxIImageFrame : nsISupports
{
  /**
   * Create a new \a aWidth x \a aHeight sized image.
   *
   * @param aX The x-offset from the origin of the gfxIImageContainer parent.
   * @param aY The y-offset from the origin of the gfxIImageContainer parent.
   * @param aWidth The width of the image to create.
   * @param aHeight The height of the image to create.
   * @param aFormat the width of the image to create.
   *
   * @note The data of a new image is unspecified (Whats the word i'm looking for here?).
   */
  void init(in PRInt32 aX,
            in PRInt32 aY,
            in PRInt32 aWidth,
            in PRInt32 aHeight,
            in gfx_format aFormat,
            in gfx_depth aDepth);

  /**
   * TRUE by default.  When set to FALSE, you will no longer be able to make any modifications
   * to the data of the image.  Any attempts will fail.
   */
  attribute boolean mutable;

  /**
   * The x-offset of the image.
   */
  readonly attribute PRInt32 x;

  /**
   * The y-offset of the image.
   */
  readonly attribute PRInt32 y;

  /**
   * The width of the image.
   */
  readonly attribute PRInt32 width;

  /**
   * The height of the image.
   */
  readonly attribute PRInt32 height;

  /**
   * The rectangle this frame ocupies.
   * @param rect this is really an out parameter.
   */
  [noscript] void getRect(in nsRectRef rect);

  /**
   * The image data format the image was created with.
   * @see gfxIFormats
   */
  readonly attribute gfx_format format;

  /* data accessors */
  readonly attribute unsigned long imageBytesPerRow;

  /**
   * returns the number of bytes allocated for the image
   */
  readonly attribute unsigned long imageDataLength;

  // XXX do we copy here?  lets not...
  void getImageData([array, size_is(length)] out PRUint8 bits, out unsigned long length);

  /**
   * Sets \a length bytes of \a data in this object.
   * @param offset The offset from the first pixel in bytes.  To set
   *   data beginning with the first (top left) pixel in the image, \a offset
   *   should be 0; to set data beginning with, for example, the sixth pixel in
   *   the first row of a RGBA32 image, the offset should be 20.
   * @attension should we use PRUint32 instead?
   */
  void setImageData([array, size_is(length), const] in PRUint8 data,
                    in unsigned long length,
                    in long offset);

  /**
   * Lock image pixels before addressing the data directly
   */
  void lockImageData();

  /**
   * Unlock image pixels
   */
  void unlockImageData();



  /* alpha stuff.. used for _A1 and _A8 formated images */
  readonly attribute unsigned long alphaBytesPerRow;

  /**
   * returns the number of bytes allocated for the alpha mask
   */
  readonly attribute unsigned long alphaDataLength;

  // XXX do we copy here?  lets not...
  void getAlphaData([array, size_is(length)] out PRUint8 bits, out unsigned long length);

  /**
   * Sets \a length bytes of \a data in this object.
   */
  void setAlphaData([array, size_is(length), const] in PRUint8 data,
                    in unsigned long length,
                    in long offset);

  /**
   * Lock alpha pixels before addressing the data directly
   */
  void lockAlphaData();

  /**
   * Unlock alpha pixels
   */
  void unlockAlphaData();



  /* GIF Specific methods.  These should be in a different class or interface. */

  /**
   * Blit this frame into another frame. Used for GIF animation compositing
   */
  void drawTo(in gfxIImageFrame aDst,
              in PRInt32 aDX,
              in PRInt32 aDY,
              in PRInt32 aDWidth,
              in PRInt32 aDHeight);

  /**
   * Represents the number of milliseconds until the next frame should be displayed.
   * @note -1 means that this frame should be displayed forever.
   */
  attribute long timeout;

  /* frame disposal method, used only by GIFs. Should probably subclass image frame
   * and image container for GIFs special needs, but for simplicity it is here for the
   * moment
   */
  attribute long frameDisposalMethod;

  /* frame background color
   * GIF specific, should be in a GIF specific frame
   */  
  attribute gfx_color backgroundColor;
};