gecko-dev/gfx/public/gfxIImageFrame.idl

/** -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * 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 Netscape are
 * Copyright (C) 2001 Netscape Communications Corporation. All
 * Rights Reserved.
 * 
 * Contributor(s): 
 *   Stuart Parmenter <pavlov@netscape.com>
 *   Chris Saari <saari@netscape.com>
 */

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

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

interface gfxIImageFrame;
native nsRectRef(nsRect &);

/**
 * gfxIImageFrame interface
 *
 * @author Tim Rowley <tor@cs.brown.edu>
 * @author Stuart Parmenter <pavlov@netscape.com>
 * @version 0.1
 */
[scriptable, uuid(51cc27a8-1dd2-11b2-a1aa-dad33ab193b4)]
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 nscoord aX,
            in nscoord aY,
            in nscoord aWidth,
            in nscoord aHeight,
            in gfx_format aFormat);

  /**
   * 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 nscoord x;

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

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

  /**
   * The height of the image.
   */
  readonly attribute nscoord 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 nscoord aDX, 
              in nscoord aDY, 
              in nscoord aDWidth, 
              in nscoord 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;

  /* frame transparent color
   * GIF specific, should be in a GIF specific frame
   */
  attribute gfx_color transparentColor;
};