gecko/widget/windows/nsImageClipboard.h
2012-07-30 17:20:58 +03:00

88 lines
2.5 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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/. */
/* 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 |nullptr|, 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