gecko/widget/windows/nsImageClipboard.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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):
* Mike Pinkerton <pinkerton@netscape.com>
* Gus Verdun <gustavoverdun@aol.com>
* Kathleen Brade <brade@comcast.net>
* Mark Smith <mcs@pearlcrescent.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either 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
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/* Things To Do 11/8/00
Check image metrics, can we support them? Do we need to?
Any other render format? HTML?
*/
#include "nsError.h"
#include <windows.h>
#include "nsCOMPtr.h"
#include "imgIContainer.h"
#include "nsIInputStream.h"
//
// nsImageToClipboard
//
// A utility class that takes an imgIContainer and does all the bitmap magic
// to allow us to put it on the clipboard
//
class nsImageToClipboard
{
public:
nsImageToClipboard ( imgIContainer* inImage );
~nsImageToClipboard();
// Call to get the actual bits that go on the clipboard. If |nsnull|, the
// setup operations have failed.
//
// NOTE: The caller owns the handle and must delete it with ::GlobalRelease()
nsresult GetPicture ( HANDLE* outBits ) ;
private:
// Computes # of bytes needed by a bitmap with the specified attributes.
PRInt32 CalcSize(PRInt32 aHeight, PRInt32 aColors, WORD aBitsPerPixel, PRInt32 aSpanBytes);
PRInt32 CalcSpanLength(PRUint32 aWidth, PRUint32 aBitCount);
// Do the work
nsresult CreateFromImage ( imgIContainer* inImage, HANDLE* outBitmap );
nsCOMPtr<imgIContainer> mImage; // the image we're working with
}; // class nsImageToClipboard
struct bitFields {
PRUint32 red;
PRUint32 green;
PRUint32 blue;
PRUint8 redLeftShift;
PRUint8 redRightShift;
PRUint8 greenLeftShift;
PRUint8 greenRightShift;
PRUint8 blueLeftShift;
PRUint8 blueRightShift;
};
//
// nsImageFromClipboard
//
// A utility class that takes a DIB from the win32 clipboard and does
// all the bitmap magic to convert it to a PNG or a JPEG in the form of a nsIInputStream
//
class nsImageFromClipboard
{
public:
nsImageFromClipboard () ;
~nsImageFromClipboard ( ) ;
// Retrieve the newly created image
nsresult GetEncodedImageStream (unsigned char * aClipboardData, const char * aMIMEFormat, nsIInputStream** outImage);
private:
void InvertRows(unsigned char * aInitialBuffer, PRUint32 aSizeOfBuffer, PRUint32 aNumBytesPerRow);
nsresult ConvertColorBitMap(unsigned char * aInputBuffer, PBITMAPINFO pBitMapInfo, unsigned char * aOutBuffer);
void CalcBitmask(PRUint32 aMask, PRUint8& aBegin, PRUint8& aLength);
void CalcBitShift(bitFields * aColorMask);
}; // nsImageFromClipboard